JPH07235412A - Superconducting magnet device - Google Patents

Abstract

PURPOSE:To suppress a voltage generated at the time of quenching to low by so forming that a current flows to a heater for forcibly quenching a superconducting coil by an operation of a quench detector when the coil is quenched to expedite the quenching of the coil. CONSTITUTION:Superconducting coils 1a, 1b are connected in series, and excited by an exciting power source 3. In this case, when the coil 1a is quenched, voltages of the coils 1, 1b are unbalanced. The unbalance is detected by a quench detector 7, and a forcible quench heater power source 8 is operated. A current is supplied from the power source 8 to forcible quench heaters 2a, 2b, and the coil 1b in which the quenching does not occur is also quenched. Both the coils 1a, 1b are quenched, a generated voltage is suppressed to low, and safety of a superconducting magnet is held. Thus, there is no possibility of damaging the coil, and its reliability can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a superconducting magnet device, and more particularly to a structure for reliable excitation operation without damaging the superconducting magnet device.

[0002]

2. Description of the Related Art An excitation operation circuit of a conventional superconducting magnet device will be described with reference to FIG. FIG. 18 shows an exciting operation circuit of a conventional superconducting magnet device disclosed in, for example, Japanese Patent Laid-Open No. 61-18845.

In the figure, 1 is a superconducting coil, 3 is an exciting power source, usually a constant current power source, 4 is a switch, and 5 is a protective resistor.

Next, the operation of the excitation operation circuit of the above-mentioned conventional superconducting magnet device will be described. Switch 4
Is closed and the superconducting coil 1 is excited by the excitation power source 3. Here, the superconducting coil 1 is quenched (normal conduction transition)
Suppose At this time, as shown in FIG. 19, resistance is generated in the superconducting coil 1 due to the quench. Normally, the switch 4 is opened with the quenching of the superconducting coil 1,
The current of the superconducting coil 1 is the sum of the protection resistance 5 (Rp) and the resistance (Rc) generated in the superconducting coil 1 (R = Rp +
Rc) and the inductance (L) of the superconducting coil 1 attenuate with a time constant (τ = L / R).

When the superconducting coil 1 is degaussed, the current is reduced by the exciting power source 3 with the switch 4 kept closed to degauss.

[0006]

The conventional superconducting magnet device is constructed as described above. Here, when the superconducting coil is quenched during the excitation operation, the voltage generated inside the superconducting coil 1 is calculated. I will try. In order to simplify the calculation, it is assumed that the superconducting coil 1 is divided into two parts as shown in FIG. 20, and the superconducting coils 1a and 1b are respectively formed without any interaction between the superconducting coils 1a and 1b. Here, the circuit equation when the quench occurs in the superconducting coil 1a is shown by the following equation. La (di / dt) + Rca × i + Lb (di / dt)
+ Rp × i = 0 where La and Lb are superconducting coils 1a and 1b, respectively.
, Rca is the resistance generated in the superconducting coil 1a, and i is the current.

The voltage V of each of the superconducting coils 1a and 1b
a and Vb are represented by Va = La (di / dt) + Rca × i Vb = Lb (di / dt). The sum voltage of the superconducting coils 1a and 1b is V = Va + Vb = Rp × i. Here, assuming that the protection resistance value is sufficiently smaller than the resistance generated in the superconducting coil 1a, V = 0 and Va = -Vb.

Here, the inductance La = Lb = 10
In the H superconducting coils 1a and 1b, when the superconducting coil 1a is quenched, its current decay (d
i / dt) may be several 100 A / s. In this case, the voltages of the superconducting coils 1a and 1b are Va = Vb =
Thousands of V, very high voltage is superconducting coils 1a, 1b
Will be applied to both ends of.

Incidentally, for the sake of simplification of description, the description has been made by dividing the coil into two coils, but the same applies to the case where the quench is partially generated in one coil, and the superconducting coil 1 is partially It goes without saying that a large voltage is applied to the.

As described above, the conventional superconducting magnet device has a problem that the quenching of the superconducting coil may generate a large voltage in the superconducting coil and damage the superconducting coil.

During excitation, the excitation power supply 3 converts the received energy into direct current, passes it through almost all, and sends it to the superconducting coil 1. Therefore, the power consumed in the excitation power supply 3 is small. On the other hand, when degaussing, the energy of the superconducting coil 1 must be consumed in the exciting power supply 3. When the rate of current decrease is small, the power consumption in the excitation power supply can be small, but when the rate of current decrease is large, the power consumption increases, and the control transistor in the excitation power supply 3 must absorb this power in order to absorb the power. It was not economical because it was necessary to install more control transistors than the required capacity. Further, a failure of the exciting power supply may lead to damage of the superconducting magnet, and it is necessary that the exciting power supply has high reliability.

Further, the superconducting coil 1 is housed in the cryostat and cooled by the refrigerant. However, if a large amount of the refrigerant is rapidly consumed by quenching, the pressure of the cryostat suddenly rises, which is dangerous.

The present invention has been made to solve the above problems, and an object thereof is to obtain a safe and highly reliable superconducting magnet device.

[0014]

A superconducting magnet device according to claim 1 of the present invention is a superconducting coil housed in a cryostat, an exciting power source for exciting the superconducting coil, and a forced quench heater for forcibly quenching the superconducting coil. , A quench detector for detecting the quench of the superconducting coil, a forced quench heater power source for supplying a current to the forced quench heater by the operation of the quench detector, and an uninterruptible power source for operating the quench detector and the forced quench heater power source. Be prepared.

In the superconducting magnet device according to claim 2 of the present invention, during a power failure, the forced quench heater power supply is operated by the uninterruptible power supply until the allowable capacity of the uninterruptible power supply is reached, and a current is supplied to the forced quench heater. Then, the superconducting coil is quenched.

A superconducting magnet device according to a third aspect of the present invention is a superconducting coil and a permanent current switch housed in a cryostat, an exciting power source for exciting the superconducting coil, a forced quench heater for forcibly quenching the superconducting coil, and a superconducting coil. A quench detector for detecting a quench of a coil, a forced quench heater power supply for supplying a current to the forced quench heater by the operation of the quench detector, a permanent current switch heater power supply for supplying a current to the heater of the permanent current switch, and the quench. It has a detector and an uninterruptible power supply that operates each of the above power supplies, and during a power failure, the uninterruptible power supply activates the permanent current switch heater power supply until it reaches the allowable capacity of the uninterruptible power supply, and A device that forcibly degausses a superconducting coil by applying an electric current A.

A superconducting magnet device according to a fourth aspect of the present invention accommodates a superconducting coil and a permanent current switch, and a cryostat for keeping a superconducting state and an exciting power source can be attached and detached by a current lead. By the time the power supply reaches the allowable capacity of the uninterruptible power supply, the above current lead is switched from the disconnected state to the connected state to activate the permanent current switch heater power supply, and current is passed through the permanent current switch heater to forcibly demagnetize the superconducting coil. To do.

A superconducting magnet device according to a fifth aspect of the present invention comprises a detecting means for detecting a disconnection of the forced quench heater by supplying a small current from the forced quench heater power source to the forced quench heater.

In the superconducting magnet device according to claim 6 of the present invention, the superconducting coil is composed of at least two or more superconducting coils, and the forced quench heater is installed at each end of the superconducting coils, and at least − superconducting coils are provided. When the coils are quenched, a current is passed through the forced quench heaters installed in all the superconducting coils to forcibly quench all the superconducting coils.

In a superconducting magnet device according to a seventh aspect of the present invention, the superconducting coil is composed of at least two superconducting coils, and the forced quench heater is installed in a direction orthogonal to each winding of the superconducting coil, and at least one superconducting coil is provided. When the above superconducting coils are quenched, a current is passed through the forced quench heaters installed in all the superconducting coils to forcibly quench all the superconducting coils.

A superconducting magnet device according to an eighth aspect of the present invention accommodates the superconducting coil and the superconducting coil,
In a superconducting magnet device in which an even number of superconducting magnets each comprising a cryostat for maintaining a superconducting state are connected in series via room temperature leads, the room temperature leads are divided by a resistance to perform quench detection by the three-terminal method.

According to a ninth aspect of the present invention, in a superconducting magnet device, a superconducting coil housed in a cryostat, an exciting power source for exciting the superconducting coil, and a turn-on voltage substantially equal to the exciting voltage of the superconducting coil, A plurality of diodes connected in series are provided in parallel with the excitation power source.

According to a tenth aspect of the present invention, there is provided a superconducting magnet device in which a superconducting coil and a quench protection diode housed in a cryostat, an exciting power supply for exciting the superconducting coil, and a voltage lower than a voltage at which the cryogenic diode is turned on are lower. In order to obtain a voltage, a plurality of diodes connected in series to the room temperature part are provided in parallel with the excitation power source.

A superconducting magnet device according to an eleventh aspect of the present invention is a superconducting magnet device comprising a superconducting coil, a permanent current switch, a quench energy absorber, and a cryostat for accommodating them and keeping them in a superconducting state. The permanent current switch is arranged above the superconducting coil, and the energy absorber is arranged above the permanent current switch.

According to a twelfth aspect of the present invention, there is provided a superconducting magnet device comprising a first container having a superconducting coil, a volume larger than that of the first container, a permanent current switch and a quench energy absorber, and a refrigerant. A second container for storing the first container, a connecting pipe for connecting the first container and the second container, and a vacuum tank for keeping each of the container and the connecting pipe at a cryogenic temperature, and a first container above the first container. Place 2 containers, 2nd
The permanent current switch is arranged in the lower part of the container and the energy absorber is arranged in the upper part.

[0026]

In the superconducting magnet device according to the first aspect of the present invention, the superconducting coil is excited by the exciting means. When the superconducting coil is quenched in this state, the quench detector operates. By the operation of the quench detector, a current is passed through the heater for forcibly quenching the superconducting coil, and the quenching of the superconducting coil is promoted. As a result, the voltage generated when the superconducting coil is quenched is suppressed to a low level, the possibility of causing dielectric breakdown, etc. is eliminated, and the safety of the superconducting magnet device is maintained.
Further, even if the quench of the superconducting coil occurs during the power failure, the uninterruptible power supply is connected so as to promote the quench of the superconducting coil.

In the superconducting magnet device according to the second aspect of the present invention, the superconducting coil is excited by the exciting means, and in this state, if a power failure occurs, the uninterruptible power supply operates. Here, if the power failure time becomes long, the allowable capacity of the uninterruptible power supply is reached. When the superconducting coil is quenched after reaching the allowable capacity of the uninterruptible power supply, the heater for promoting the quenching of the superconducting coil cannot be supplied with current, and the quenching of the superconducting coil cannot be promoted. Therefore, by forcibly quenching the superconducting coil before the allowable capacity of the uninterruptible power supply is reached, the safety of the superconducting magnet device can be further maintained.

In the superconducting magnet device according to claim 3 of the present invention, the superconducting coil is operated by a permanent current switch by a permanent current. When a power failure occurs in this state, the uninterruptible power supply operates, but when the power failure time becomes long, the allowable capacity of the uninterruptible power supply is reached. If the superconducting coil is quenched after reaching the allowable capacity of the uninterruptible power supply, the heater for promoting the quenching of the superconducting coil cannot be supplied with current, and the quenching of the superconducting coil cannot be promoted. Therefore, before the permissible capacity of the uninterruptible power supply is reached, the permanent current switch is forcibly quenched and the energy of the superconducting coil is consumed outside the cryostat to demagnetize the superconducting coil, whereby the superconducting coil is demagnetized. The safety of the magnet device can be maintained.

In the superconducting magnet device according to a fourth aspect of the present invention, the superconducting coil is operated by a permanent current switch by a permanent current. Also, the detachable lead is in the [disengaged] state. When a power failure occurs in this state, the uninterruptible power supply operates, but when the power failure time becomes long, the allowable capacity of the uninterruptible power supply is reached. If the superconducting coil is quenched after reaching the allowable capacity of the uninterruptible power supply, the heater for promoting the quenching of the superconducting coil cannot be supplied with current, and the quenching of the superconducting coil cannot be promoted. Therefore, before reaching the allowable capacity of the uninterruptible power supply, the detachable lead is put into the [attached] state, the permanent current switch is forcibly quenched, and the energy of the superconducting coil is consumed outside the cryostat. By degaussing the superconducting coil, the safety of the superconducting magnet device can be maintained.
In addition, if the permanent current switch is forcibly quenched with the detachable lead in the [disengaged] state, the energy of the superconducting coil is consumed in the cryostat and the refrigerant evaporates, which is not economical.

In the superconducting magnet device according to the fifth aspect of the present invention, a minute current is always supplied to the forced quench heater installed in the superconducting coil. This minute current stops flowing when the heater or a lead wire for introducing a current to the heater is disconnected. Therefore, by measuring the minute current and detecting whether or not the current is flowing, the presence or absence of the disconnection can be detected, and the quenching of the superconducting coil can be surely promoted. The minute current is a current that does not quench the superconducting coil.

In the superconducting magnet device according to claim 6 of the present invention, the heater for forcibly quenching the superconducting coil is installed at the end of the superconducting coil. The end portion of the superconducting coil has a high magnetic field and quenching is promoted quickly, so that the safety of the superconducting magnet device is maintained.

In the superconducting magnet device according to claim 7 of the present invention, the heater for forcibly quenching the superconducting coil is installed in a direction orthogonal to the winding of the superconducting coil. When the heater is installed in the direction orthogonal to the winding, quenching of the entire superconducting coil is promoted, and safety of the superconducting magnet device is enhanced.

In the superconducting magnet device according to claim 8 of the present invention, an even number of the superconducting magnets connected in series through the room temperature leads are divided by a resistance voltage dividing method to divide the voltage of the room temperature leads by a three-terminal method. The midpoint of the quench detection of is easily obtained.

In the superconducting magnet device according to claim 9 of the present invention, a plurality of diodes are connected in series with the exciting power source in parallel so that the turn-on voltage is substantially equal to the exciting voltage of the superconducting coil. Excitation / demagnetization speeds are almost equal. Such a configuration does not require a control system as in the past and increases the reliability of the excitation power source.

In the superconducting magnet device according to claim 10 of the present invention, a plurality of diodes are connected in series in the room temperature section in parallel with the exciting power source so that the voltage becomes lower than the voltage at which the cryogenic diode turns on. Due to
The reliability of the excitation power source is increased, and the superconducting coil can be demagnetized without turning on the cryogenic diode.

In the superconducting magnet device according to claim 11 of the present invention, the permanent current switch is arranged above the superconducting coil and the energy absorber is arranged further above the superconducting coil. The permanent current switch enters the normal conducting state before the coil.
At this time, a permanent current cannot be passed through the superconducting coil, and the energy of the superconducting coil is consumed by the energy absorber arranged above. Therefore, by consuming energy in the gas atmosphere of the refrigerant, there is no abrupt pressure increase of the cryostat by the refrigerant and no abrupt consumption of the refrigerant, and the safety and reliability of the superconducting magnet device can be maintained.

According to a twelfth aspect of the present invention, in the superconducting magnet device, a permanent current switch and a quench energy absorber having a volume larger than that of the first container are accommodated above the first container accommodating the superconducting coil. Since the second container for storing the refrigerant is arranged, the permanent current switch is arranged in the lower part of the second container, and the energy absorber is arranged in the upper part, the liquid level is lowered due to the consumption of the refrigerant, so that the superconducting coil is First, the permanent current switch goes into the normal conducting state.
At this time, a permanent current cannot be passed through the superconducting coil, and the energy of the superconducting coil is consumed by the energy absorber arranged above. Therefore, by consuming energy in the gas atmosphere of the refrigerant, there is no abrupt pressure increase of the container due to the refrigerant, abrupt consumption of the refrigerant, etc., and the safety and reliability of the superconducting magnet device can be maintained.
Further, since the first container has a small volume and a small amount of refrigerant, the pressure rise is small, and since the gasified refrigerant is not rapidly transmitted to the second container due to the presence of the connecting pipe, safety is improved. Further increase.

[0038]

【Example】

Example 1. A superconducting magnet device according to claim 1 of the present invention will be described with reference to FIG. In FIG. 1, the superconducting coils 1a and 1b, the excitation power source 3, the switch 4, and the protective resistor 5 are the same as those of the conventional one. 2a and 2b are superconducting coils 1
a, a heater for forcibly quenching 1b (forced quench heater), 6 is a cryostat for keeping the superconducting coils 1a, 1b in a superconducting state, 8 is a power supply (forced forcing) to the forced quench heaters 2a, 2b (Quench heater power supply), 7 is a quench detector having means for detecting the quench of the superconducting coils 1a, 1b and controlling the forced quench heater power supply 8, and 9 is for supplying power to the quench detector 7 and the forced quench heater power supply 8. It is an uninterruptible power supply, and the arrow indicated by a thick line is a power supply line.

Next, the operation of the first embodiment will be described.
The superconducting coils 1a and 1b are connected in series, and the excitation power source 3
Is excited by. Here, consider a case where the superconducting coil 1a is quenched. When the superconducting coil 1a is quenched, an imbalance occurs in the voltages of the superconducting coils 1a and 1b, and the quench detector 7 detects this imbalance and activates the forced quench heater power supply 8. A current is supplied from the forced quench heater power supply 8 to the forced quench heaters 2a and 2b, and the superconducting coil 1b in which quenching has not occurred
Also quench. By quenching both superconducting coils 1a and 1b, the generated voltage is suppressed to a low level, and the safety of the superconducting magnet device is maintained. The superconducting coil 1
If b is not forcibly quenched, superconducting coil 1
A large voltage is generated in both a and 1b, which may cause dielectric breakdown.

If the uninterruptible power supply 9 is not connected and the quench occurs during a power failure, the quench detector 7
Also, the forced quench heater power supply 8 does not operate, a large voltage is generated, and there is a possibility of causing dielectric breakdown.

Example 2. A superconducting magnet device according to claim 2 of the present invention will be described with reference to FIGS. 2 and 3. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. In FIGS. 2 and 3, reference numeral 10 is a power failure signal indicating the power failure operation mode of the uninterruptible power supply 9. The power failure signal 10 informs the forced quench heater power source 8 of the power failure operation mode of the uninterruptible power source 9 and prompts the supply of current to the forced quench heaters 2a and 2b. 11 is a timer.

Next, the operation of the second embodiment will be described.
2 and 3, the superconducting coil 1 is similar to the first embodiment.
a and 1b are connected in series and are excited by the excitation power supply 3. Now consider the case where a power outage occurs. When a power failure occurs, the uninterruptible power supply 9 enters the power failure operation mode and is operated until the capacity of the uninterruptible power supply 9 is reached. If the power outage time becomes long and the allowable capacity of the uninterruptible power supply 9 is reached, the uninterruptible power supply 9 cannot supply power. In this state, it is assumed that the superconducting coil 1a is quenched. At this time, since power cannot be supplied to the quench detector 7 and the forced quench heater power supply 8 at this time, the superconducting coil 1b cannot be forcibly quenched, and a large voltage may be generated to cause dielectric breakdown. Therefore, in order to avoid danger, it is necessary to forcibly quench the superconducting coils 1a and 1b before the capacity of the uninterruptible power supply 9 is reached.

As shown in FIG. 2, the uninterruptible power supply 9 enters the power failure operation mode, and at the same time the forced quench heater power supply 8
Is operated to forcibly quench the superconducting coils 1a and 1b to maintain the safety of the superconducting magnet device.

The one shown in FIG. 3 is the uninterruptible power supply 9
When the power supply is in the power failure operation mode, the timer 11 is activated, and by setting the timer 11 to a time within the allowable capacity range of the uninterruptible power supply 9, the forced quench heater power supply 8 is operated with a time difference, and the superconducting coils 1a and 1b are operated. Force the quench to keep the superconducting magnet device safe. In this case, if the power failure time is short, there is an advantage that the superconducting coils 1a and 1b need not be forcibly quenched.

Although the timer is used to provide the time difference in FIG. 3, a timed relay or the like may be used. Further, if the uninterruptible power supply 9 has a signal indicating the end of life, it may be used. At this time,
Timer 11 is omitted.

Example 3. A superconducting magnet device according to claim 3 of the present invention will be described with reference to FIGS. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. In FIGS. 4 and 5, 13 is a permanent current switch, which is connected in parallel to the superconducting coils 1a and 1b connected in series. The permanent current switch 13 comprises a superconducting wire and a permanent current switch heater for raising the temperature of the superconducting wire to a temperature equal to or higher than the critical temperature to bring it into the normal conducting state. 1
Reference numeral 2 denotes a power supply (permanent current switch heater power supply) for supplying a current to the heater of the permanent current switch. With this power source 12, the permanent current switch 13 can be switched between a superconducting state and a normal conducting state. In this embodiment, the uninterruptible power supply 9 supplies power to the quench detector 7, the forced quench heater power supply 8 and the permanent current switch heater power supply 12. Further, the power failure signal 10 from the uninterruptible power supply 9 informs the permanent current switch heater power supply 12 of the power failure operation mode of the uninterruptible power supply 9 and prompts the heater of the permanent current switch 13 to be energized with current.

Next, the operation of the third embodiment will be described.
First, the permanent current switch heater power supply 12 supplies a current to the heater of the permanent current switch 13. At this time, the permanent current switch 13 is in the normal conducting state. In this state, as in the first embodiment, the superconducting coils 1a and 1b are excited by the exciting power source 3. When the current value reaches a predetermined value, the permanent current switch heater power supply 12 is turned off. The permanent current switch 13 becomes superconducting. When the current of the exciting power supply 3 is lowered in this state, the difference between the current flowing through the superconducting coils 1a and 1b and the current of the exciting power supply 3 flows through the permanent current switch 13. When the current of the exciting power source 3 becomes zero, the current flowing through the superconducting coils 1a and 1b becomes equal to the current flowing through the permanent current switch 13. When the switch 4 is opened in this state, the current in the superconducting coils 1a and 1b is operated in the permanent current mode via the permanent current switch 13.

Here, for example, when the superconducting coil 1a is quenched, the quench is detected by the quench detector 7 and the forced quench heater power supply 8 is activated, as in the first embodiment.
Electric current is supplied to the forced quench heaters 2a and 2b to quench the superconducting coil 1b which has not been quenched. By quenching both superconducting coils 1a and 1b, the generated voltage is suppressed to a low level, and the safety of the superconducting magnet device is maintained.

Here, consider the case where a power failure occurs. When a power failure occurs, the uninterruptible power supply 9 enters the power failure operation mode and is operated until the capacity of the uninterruptible power supply 9 is reached. If the power outage time becomes long and the allowable capacity of the uninterruptible power supply 9 is reached, the uninterruptible power supply 9 cannot supply power. In this state, it is assumed that the superconducting coil 1a is quenched.
At this time, since the quench detector 7 and the forced quench heater power source 8 cannot be supplied with power, the superconducting coils 1a and 1b cannot be forcibly quenched, and a large voltage is generated to cause dielectric breakdown. Therefore, in order to avoid this dangerous state, it is necessary to forcibly reduce the currents of the superconducting coils 1a and 1b to zero before reaching the allowable capacity of the uninterruptible power supply 9.

In the system shown in FIG. 4, the uninterruptible power supply 9 enters the power failure operation mode, and at the same time, the permanent current switch heater power supply 12 is operated to put the permanent current switch 13 into the normal conduction state, whereby the superconducting coil 1a, The energy of 1b is absorbed by the protective resistor 5 to keep the safety of the superconducting magnet device.

The one shown in FIG. 5 is the uninterruptible power supply 9
When the power supply is in the power failure operation mode, the timer 11 is activated and the timer is set to a time within the allowable capacity range of the uninterruptible power supply 9 to operate the permanent current switch heater power supply 12 with a time lag to operate the superconducting coils 1a and 1b. Energy is absorbed by the protective resistor 5 to maintain the safety of the superconducting magnet device. In this case, if the power failure time is short, the superconducting coil 1
There is an advantage that the currents a and 1b do not have to be zero.

Although a timer is used to provide the time difference in FIG. 5, a timed relay or the like may be used. Further, if the uninterruptible power supply 9 has a signal indicating the end of life, it may be used. At this time, FIG.
Timer 11 is omitted.

Example 4. A superconducting magnet device according to claim 4 of the present invention will be described with reference to FIGS. 6 and 7. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. 6 and 7, reference numerals 14a and 14b denote removable current leads that allow the cryostat 6 and the excitation power source 3 to be attached and detached. When no current is supplied from the excitation power source 3 in order to reduce heat intrusion into the cryostat 6. Normally, leave it in the [out] state. Further, 15 is a protective resistor provided in the cryostat 6, and the detachable lead 14
When a and 14b are in the "disengaged" state, the protection resistor 5 provided on the excitation power source side is separated from the superconducting coils 1a and 1b, so that the resistance that absorbs the energy of the superconducting coils 1a and 1b is inside the cryostat 6. Will be needed.

Next, the operation of the fourth embodiment will be described.
First, the detachable current leads 14a and 14b are set to the [attached] state, and the operation is performed in the permanent current mode by the same operation as in the third embodiment.

When the superconducting coil 1a is quenched, the forced quench heater power source 8 is activated as in the first embodiment,
By quenching the superconducting coil 1b that has not been quenched, the safety of the superconducting magnet device is maintained.

When a power failure occurs and the allowable capacity of the uninterruptible power supply 9 is reached, the superconducting coils 1a and 1b cannot be forcibly quenched as in the third embodiment, and a large voltage is generated, which may cause dielectric breakdown. There is a nature. Therefore, in order to avoid the danger, it is necessary to forcibly reduce the currents of the superconducting coils 1a and 1b to zero before the capacity of the uninterruptible power supply 9 is reached.

As shown in FIG. 6, when the uninterruptible power supply 9 enters the power failure operation mode, the detachable current leads 14a, 1
4b is set to the "wearing" state, the permanent current switch heater power supply 12 is operated, and the permanent current switch 13 is set to the normal conducting state, so that the energy of the superconducting coils 1a and 1b is absorbed by the protective resistance 5 and superconducting. Keep the magnet device safe. The detachable current leads 14a, 14
If the same operation is performed in the state where b is in the [disengaged] state, the energy of the superconducting coils 1a and 1b is absorbed by the protective resistor 15 in the cryostat 6 and the temperature of the cryostat 6 rises, which is not preferable. Moreover, there is a possibility that the superconducting coils 1a and 1b are quenched by this temperature rise.

The one shown in FIG. 7 operates similarly to that shown in FIG. 5 described in the third embodiment. That is, when the uninterruptible power supply 9 enters the power failure operation mode, the timer 11 is activated, and the timer is set to a time within the allowable capacity range of the uninterruptible power supply 9, thereby providing a time difference and attaching / detaching the current leads 14a, 14b.
Is set to the [wearing] state, and the permanent current switch heater power supply 12 is operated.

Example 5. A superconducting magnet device according to claim 5 of the present invention will be described with reference to FIG. In the figure,
The same reference numerals as those in FIG. 1 indicate the same or corresponding portions. In FIG. 8, 16 is a switch for turning on and off the current of the forced quench heater 2a, 17 is a resistor for flowing a minute current to the forced quench heater 2a when the switch 16 is in the off state, and 18 is both ends of the resistor 17. It is a voltmeter for measuring voltage.

Next, the operation of the fifth embodiment will be described.
When the switch 20 is off, a minute current flows through the resistor 17, and the voltage is observed by the voltmeter. If the forced quench heater 2a is disconnected, the voltmeter 18
Then 0 volt is observed. Therefore, by observing the voltage of the voltmeter 18, it is possible to detect disconnection of the forced quench heater 2a and the lead wire connecting it. When a wire break is detected, the superconducting magnet is immediately demagnetized. It should be noted that the minute current referred to here is a current below the current at which the superconducting coil 1a is not quenched due to the heat generation of the forced quench heater 2a, and above the detection sensitivity limit.

Example 6. A superconducting magnet device according to claim 6 of the present invention will be described with reference to FIGS. 9, 10 and 11. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. FIG. 9 is a perspective view in which the forced quench heater 2a is attached to the superconducting coil 1a. The forced quench heater 2a is installed at the end of the superconducting coil 1a. Although the racetrack type superconducting coil 1a is shown in the figure for simplicity, a saddle type or the like may be used.

When the superconducting coil 1b is quenched and detected, and the forced quench heater 2a of the superconducting coils 1a and 1b is turned on, the superconducting coil 1a,
If 1b is not quenched, superconducting coils 1a and 1b
There is a possibility that a large difference in resistance will occur and a large voltage will be generated. Therefore, it is necessary to quench the superconducting coils 1a and 1b immediately after the quench is detected.

In a racetrack type coil as shown in FIG. 9, the corners are generally called the ends. The magnetic field in this portion is higher than the magnetic field in the central portion (straight portion in FIG. 9). Here, the superconducting state is lost and the state becomes normal conducting,
Propagation velocity as it propagates (normal conduction velocity)
think about. Generally, if the current density of the superconducting wire is the same, the higher the magnetic field, the higher the normal conduction propagation velocity. FIG. 10 shows a schematic graph of this situation.
It can be seen that the higher the magnetic field, the higher the normal conduction propagation velocity.

The fact that the normal conduction propagation velocity is high means that
This means that the normal conducting portion spreads quickly, the difference in resistance generated between the superconducting coils 1a and 1b becomes small, a large voltage does not occur, and the safety of the superconducting magnet device can be maintained.

Although the forced quench heater is installed at one end in FIG. 9, it may be installed at both ends as shown in FIG.

Example 7. A superconducting magnet device according to claim 7 of the present invention will be described with reference to FIG. FIG. 9 has already been shown in the sixth embodiment. It shows that the forced quench heater 2a is installed in the direction orthogonal to the winding.

By installing the forced quench heater 2a in the direction orthogonal to the windings, many windings can be forcedly quenched at the same time, and as in the sixth embodiment, the superconducting coils 1a and 1a are connected.
The difference in resistance generated in b is reduced, a large voltage is not generated, and the safety of the superconducting magnet device can be maintained.

Example 8. A superconducting magnet device according to claim 8 of the present invention will be described with reference to FIG. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. Figure 1
In FIG. 2, 6a and 6b are superconducting coils 1 respectively.
This is a cryostat that stores a and 1b and keeps it at an extremely low temperature, and each superconducting coil and each cryostat constitute one superconducting magnet. Reference numeral 19 is a resistance voltage divider, and 20 is a lead wire (normal temperature lead) that connects two superconducting magnets. The superconducting coil 1a housed in the cryostat 6a and the superconducting coil 1b housed in the cryostat 6b are the leads at room temperature. Wire 20 (room temperature lead)
Connected by.

Next, the operation of the eighth embodiment will be described.
When the superconducting coils 1a and 1b are excited by the exciting power source 3, a current flows through the room temperature lead 20. At this time, a resistive voltage is generated in the room temperature lead 20. The three-terminal quench detection method requires a midpoint, but normally, in a superconducting magnet device, the current value is about several hundred A to several thousand A, and it is difficult to take out the voltage tap from the central portion of the room temperature lead 20. .

Further, the voltage tap is usually the superconducting coil 1.
Since it is always provided at both ends of a and 1b, it is convenient to use this. In FIG. 12, one of the voltage taps of each of the superconducting coils 1a and 1b is connected to both ends of the resistance voltage divider 19 so that the midpoint of the coils in which the superconducting coils 1a and 1b are connected in series is obtained. The middle point of the three-terminal quench detection method is obtained by using the intermediate tap of the resistance voltage divider 19.

Example 9. A superconducting magnet device according to claim 9 of the present invention will be described with reference to FIG. In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. Figure 1
In FIG. 3, reference numeral 21 is a diode connected in large numbers in series. The diode 21 is connected in parallel with the superconducting coils 1a and 1b connected in series.

Next, the operation of the ninth embodiment will be described.
First, the switch 4 is closed and the excitation power source 3 excites the superconducting coils 1a and 1b. Here, the superconducting coil 1
Consider the case of demagnetizing a and 1b. Normally, with the switch 4 closed, the exciting power supply 3 reduces the current. During excitation, the excitation power supply 3 converts the received energy into direct current, passes it almost completely, and sends it to the superconducting coils 1a, 1b. Therefore, the power consumed in the excitation power supply 3 is small. However, when demagnetizing, the superconducting coils 1a, 1
The energy of b must be consumed in the excitation power supply 3. When the rate of current decrease is small, the power consumption in the excitation power supply can be small, but when the rate of current decrease is large, the power consumption increases, and the control transistor in the excitation power supply 3 must absorb this power in order to absorb the power. It is not economical because it is necessary to install a control transistor with a capacity larger than that required for the.

As in this embodiment, an inexpensive diode 21 is used.
By connecting in series and utilizing the voltage drop of the diode, it is possible to obtain a demagnetization speed that is similar to the excitation speed with an inexpensive system. Moreover, no control system is required, the reliability of the excitation power source is improved, and therefore the reliability of the superconducting magnet device is also improved. For example, when the excitation voltage is 100V, in order to obtain a demagnetization voltage similar to this, approximately 100 diodes should be connected in series.

Example 10. A superconducting magnet device according to claim 10 of the present invention will be described with reference to FIG. In addition,
In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 14, 22 is a quench protection diode that is connected in series and is installed in a cryogenic temperature (cryostat 6). The diode 22 is connected in parallel with the superconducting coils 1a and 1b connected in series. The protection diode 22 is installed to protect the superconducting coils 1a and 1b, and the diode 21 is removed for some reason on the exciting power source 3 side, or
When the lead wires connecting the excitation power source 3 and the superconducting coils 1a and 1b are disconnected, and the protection cannot be performed outside the cryostat 6, it is installed in the cryostat 6 for protection. .

Next, the operation of the tenth embodiment will be described. The excitation / demagnetization operation is the same as in the ninth embodiment. Here, the characteristics of the protection diode 22 installed in the extremely low temperature will be described. The characteristic of the protection diode 22 is shown in FIG.
5 shows. As shown in the figure, at first, almost no current flows even if a voltage is applied, and a normal diode turns on at a voltage about 10 times the normal temperature characteristic, and then the temperature of the diode rises due to self-heating. Get closer.

If the protective diode 22 is used for normal demagnetization, the temperature of the cryostat 6 will rise, which is not preferable. Furthermore, it is difficult to install many diodes in the cryostat 6 in terms of space.

Therefore, in the normal demagnetization, it is desirable that the voltage drop of the diode 21 is utilized and the protection diode 22 is not turned on at this time. To achieve this, the voltage drop of the diode 21 may be set to be equal to or lower than the turn-on voltage of the protection diode 22.

Example 11. A superconducting magnet device according to claim 11 of the present invention will be described with reference to FIG. In addition,
In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 16, 23 is a refrigerant (for example, liquid helium). A quench energy absorber (here, a protective resistor 15) is arranged above the superconducting coil 1a and above the permanent current switch 13.

Next, the operation of the eleventh embodiment will be described. In FIG. 16, superconducting coil 1a is assumed to be operated in the persistent current mode. Further, in the initial stage, the protection resistor 15 is also immersed in the refrigerant 23. The cryostat 6 that houses the coil 1a that is being operated with a permanent current is exposed to heat from the outside, and the liquid level of the refrigerant 23 gradually decreases. As shown in FIG. 16, first, the liquid level of the refrigerant 23 is protected. It becomes the lower surface than the resistor 15. When the liquid level further lowers, the liquid level of the refrigerant 23 becomes lower than the permanent current switch 13.

Normally, the additional liquid of the refrigerant 23 is stored so that the liquid level of the refrigerant 23 does not become lower than the permanent current switch 13. However, for some reason, the additional liquid cannot be stored. The case is assumed. In this state, the permanent current switch 13 is quenched to be in the normal conducting state,
A permanent current cannot be passed through the superconducting coil 1a, so that the energy of the superconducting coil 1a is placed above the protective resistor 15
Consumed in.

Therefore, by consuming energy in the gas atmosphere of the refrigerant 23, the sensible heat of the refrigerant 23 can be used to cool the protective resistor 15, and the cryostat 6 is rapidly increased in pressure by the refrigerant 23, and the refrigerant is abruptly increased. It is possible to maintain the safety of the superconducting magnet device without any unnecessary consumption.

If the superconducting coil 1a is arranged above the permanent current switch 13, the permanent current switch 13
The superconducting coil 1a is quenched before that, and the consumption amount of the refrigerant increases, which is not economical.

Example 12 A superconducting magnet device according to claim 12 of the present invention will be described with reference to FIG. In addition,
In the figure, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts. In FIG. 17, reference numeral 24 is a coil container (first container) containing the superconducting coil 1a, and 25 is a storage container (second container) containing the permanent current switch 13, the protective resistor 15 and the refrigerant 23.
And has a larger volume than the coil container 24. 26 is a connecting pipe for connecting the coil container 24 and the storage container 25, and 27 is a connecting pipe 26 for the coil container 24, the storage container 25 and the connection container 26.
It is a vacuum chamber for storing and keeping it at a very low temperature. Normally,
The coil container 24 and the storage container 25 are separately manufactured, and are connected by a connecting pipe 26 during assembly. Figure 1 shows the structure
7, the coil container 24 is arranged below and the storage container 25 is arranged above. In addition, normally, the amount of the refrigerant 23 stored in the coil container 24 is designed to be small.

Next, the operation of the twelfth embodiment will be described. The operation of the twelfth embodiment is almost the same as the operation of the eleventh embodiment, but due to the existence of the connecting pipe 26, it is also effective when the superconducting coil 1a is quenched. That is, even if the superconducting coil 1a is quenched, the coil container 24
Since the amount of the refrigerant 23 is small, the amount of the gasified refrigerant is small. On the other hand, in the storage container 25, the connecting pipe 26 functions just like a valve, and the storage container 25 includes the coil container 24.
The gasified refrigerant 23 is not rapidly transmitted, and therefore the storage container 25 is not accompanied by a rapid pressure increase, and the safety and reliability of the superconducting magnet device can be maintained. In addition, since the withstand pressure of the storage container 25 can be small, it is economical.

[0085]

As described above, according to claim 1 of the present invention, the superconducting coil housed in the cryostat,
Excitation power source for exciting the superconducting coil, Forced quench heater for forcibly quenching the superconducting coil, Quench detector for detecting quench of the superconducting coil, Forced quench heater power source for supplying current to the forced quench heater by actuation of the quench detector , And because the superconducting magnet device is composed of an uninterruptible power supply that operates the quench detector and the forced quench heater power supply, there is no possibility of damaging the superconducting coil due to quenching of the superconducting coil, and reliability that allows safe excitation operation. It is possible to obtain a superconducting magnet device with high efficiency.

According to the second aspect of the present invention, in the above superconducting magnet device, the forced quench heater power source is operated by the uninterruptible power source until the allowable capacity of the uninterruptible power source is reached at the time of a power failure, so that the forced quench heater is operated. Since I tried to quench the superconducting coil by passing an electric current,
The superconducting coil can be forcibly and reliably quenched even during a power failure, and a safer and more reliable superconducting magnet device can be obtained.

According to the third aspect of the present invention, the superconducting coil and the permanent current switch housed in the cryostat, the excitation power source for exciting the superconducting coil, the forced quench heater for forcibly quenching the superconducting coil, and the quench of the superconducting coil. A quench detector for detecting, a forced quench heater power supply for supplying a current to the forced quench heater by the operation of the quench detector, a permanent current switch heater power supply for supplying a current to the heater of the permanent current switch,
And a superconducting magnet device is configured by an uninterruptible power supply that operates the quench detector and each of the power supplies, and at the time of a power failure, the uninterruptible power supply operates the permanent current switch heater power supply until it reaches the allowable capacity of the uninterruptible power supply. Since the permanent current switch heater is activated and the superconducting coil is forcibly degaussed by supplying a current to the heater, the superconducting coil can be degaussed by making the permanent current switch normal conducting in the event of a power failure, thus ensuring the safety of the superconducting magnet device. Sex is maintained,
A highly reliable superconducting magnet device can be obtained.

According to a fourth aspect of the present invention, a cryostat for accommodating the superconducting coil and the permanent current switch in the superconducting magnet device and keeping the superconducting state.
Exciting power supply and detachable with current leads, in the event of a power failure, the uninterruptible power supply operates the permanent current switch heater power supply from the disconnected state to the worn state until the capacity of the uninterruptible power supply is reached. Since a current is passed through the permanent current switch heater to forcibly demagnetize the superconducting coil, the safety of the superconducting magnet device can be maintained and a highly reliable superconducting magnet device can be obtained.

According to a fifth aspect of the present invention, each of the superconducting magnet devices is provided with a detecting means for detecting a disconnection of the forced quench heater by supplying a small current from the forced quench heater power source to the forced quench heater. Therefore, quenching of the superconducting coil can be surely promoted, and a safer and highly reliable superconducting magnet device can be obtained.

According to claim 6 of the present invention, the superconducting coil is composed of at least two or more superconducting coils, the forced quench heater is installed at each end of the superconducting coils, and at least-the superconducting coils are quenched. In this case, a current is passed through the forced quench heaters installed in all the superconducting coils to forcibly quench all the superconducting coils, so the normal conducting part spreads quickly and the difference in resistance generated in the superconducting coils is increased. It is possible to obtain a safer and more reliable superconducting magnet device which becomes smaller and which does not generate a large voltage.

According to claim 7 of the present invention, the superconducting coil is composed of at least two or more superconducting coils, and the forced quench heater is installed in a direction orthogonal to each winding of the superconducting coils, and at least one of the superconducting coils is provided. When the coils are quenched, the forced quench heaters installed on all the superconducting coils are energized to quench all the superconducting coils, so that the normal conducting part spreads quickly and the resistance that occurs in the superconducting coils. Difference becomes small, a large voltage does not occur, and a safer and more reliable superconducting magnet device can be obtained.

According to claim 8 of the present invention, a superconducting magnet device is provided in which an even number of superconducting magnets each consisting of a superconducting coil and a cryostat for accommodating the superconducting coil and maintaining the superconducting state are connected in series via a room temperature lead. On the other hand, since the room temperature lead is divided by a resistor to perform quench detection by the three-terminal method, there is an effect that the middle point of quench detection by the three-terminal method can be easily obtained.

According to claim 9 of the present invention, the superconducting coil housed in the cryostat, the exciting power source for exciting the superconducting coil, and the exciting power source so that the exciting voltage of the superconducting coil is substantially equal to the turn-on voltage. Since the superconducting magnet device is composed of a plurality of diodes connected in series in parallel with the above, it is possible to obtain a demagnetization speed substantially similar to the excitation speed with an inexpensive system. Further, such a configuration does not require a control system as in the prior art, and has the effect of increasing the reliability of the excitation power source and, as a result, increasing the reliability of the superconducting magnet device.

According to the tenth aspect of the present invention, the voltage becomes lower than the voltage at which the superconducting coil and the quench protection diode housed in the cryostat, the exciting power source for exciting the superconducting coil, and the cryogenic diode are turned on. As described above, since the superconducting magnet device is constituted by a plurality of diodes connected in series at room temperature in parallel with the exciting power source, the reliability of the exciting power source is increased and the cryogenic diode is turned on as in the above device. Without doing so, the superconducting coil can be demagnetized.

According to the eleventh aspect of the present invention, there is provided a superconducting magnet device comprising a superconducting coil, a permanent current switch, a quench energy absorber, and a cryostat for accommodating them and keeping them in a superconducting state. The permanent current switch is arranged above the superconducting coil, and the energy absorber is arranged above the permanent current switch. The current switch is in the normal conducting state, the permanent current cannot be passed through the superconducting coil, and the energy of the superconducting coil is consumed by the energy absorber arranged above. Therefore, by consuming energy in the gas atmosphere of the refrigerant, there is no abrupt pressure increase of the cryostat due to the refrigerant, abrupt consumption of the refrigerant, etc., and it is possible to maintain the safety and reliability of the superconducting magnet device. Play.

According to a twelfth aspect of the present invention, there is provided a first container for accommodating a superconducting coil, a volume larger than that of the first container, accommodating a permanent current switch and a quench energy absorber, and storing a refrigerant. 2nd container, 1st container and 2nd container
A connecting pipe for connecting the above containers and a vacuum tank for keeping the above containers and the connecting pipe in a cryogenic state, the second container is arranged above the first container, and the second container is provided below the second container. The permanent current switch, because the energy absorber is arranged on the upper part, like the device, there is no sudden pressure increase of the container, sudden consumption of the refrigerant, etc., the safety of the superconducting magnet device,
And reliability can be maintained. Furthermore, since the first container has a small volume and a small amount of refrigerant, the amount of gasified refrigerant is small, and the presence of the connecting pipe prevents the gasified refrigerant from being rapidly transmitted to the second container. , Further increase safety.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing a superconducting magnet device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram showing a superconducting magnet device according to a second embodiment of the present invention.

FIG. 3 is a circuit configuration diagram showing another superconducting magnet device according to Embodiment 2 of the present invention.

FIG. 4 is a circuit configuration diagram showing a superconducting magnet device according to a third embodiment of the present invention.

FIG. 5 is a circuit configuration diagram showing another superconducting magnet device according to Embodiment 3 of the present invention.

FIG. 6 is a circuit configuration diagram showing a superconducting magnet device according to Embodiment 4 of the present invention.

FIG. 7 is a circuit configuration diagram showing another superconducting magnet device according to embodiment 4 of the present invention.

FIG. 8 is a circuit configuration diagram showing a part of a superconducting magnet device according to a fifth embodiment of the present invention.

FIG. 9 is a perspective configuration diagram showing superconducting coils according to Embodiments 6 and 7 of the present invention.

FIG. 10 is a characteristic diagram showing a relationship between a magnetic field and a normal conduction propagation velocity in a superconducting wire.

FIG. 11 is a perspective configuration diagram showing another superconducting coil according to Embodiments 6 and 7 of the present invention.

FIG. 12 is a circuit configuration diagram showing a superconducting magnet device according to an eighth embodiment of the present invention.

FIG. 13 is a circuit configuration diagram showing a superconducting magnet device according to Example 9 of the present invention.

FIG. 14 is a circuit configuration diagram showing a superconducting magnet device according to Example 10 of the invention.

FIG. 15 is a characteristic diagram showing characteristics of the protective diode according to the tenth embodiment of the present invention.

FIG. 16 is a circuit configuration diagram showing a superconducting magnet device according to Example 11 of the present invention.

FIG. 17 is a circuit configuration diagram showing a superconducting magnet device according to Embodiment 12 of the present invention.

FIG. 18 is a circuit diagram showing a conventional superconducting magnet device.

FIG. 19 is an explanatory diagram illustrating an operation of a conventional superconducting magnet device.

FIG. 20 is an explanatory diagram illustrating an operation of a conventional superconducting magnet device.

[Explanation of symbols]

 1 superconducting coil 1a superconducting coil 1b superconducting coil 2a forced quench heater 2b forced quench heater 3 excitation power supply 4 switch 5 protective resistance 6 cryostat 6a cryostat 6b cryostat 7 quench detector 8 forced quench heater power supply 9 uninterruptible power supply 10 timer 12 power failure signal Permanent current switch Heater power supply 13 Permanent current switch 14a Detachable current lead 14b Detachable current lead 15 Protection resistor 16 Switch 17 Resistance 18 Voltmeter 19 Resistance voltage divider 20 Room temperature lead 21 Diode 22 Protection diode 23 Refrigerant 24 Coil container 25 Storage container 26 Connection Tube 27 vacuum tank

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadatoshi Yamada 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Institute (72) Inventor Shiro Nakamura 8-1-1 Tsukaguchihonmachi, Amagasaki Mitsubishi Electric Central Research Institute Co., Ltd. (72) Inventor Tetsuya Matsuda 8-1-1 Tsukaguchi Honmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Institute (72) Inventor Toshie Takeuchi 8-1-1 Tsukaguchi Honmachi, Amagasaki Mitsubishi Electric Corporation Inside the Central Research Laboratory (72) Inventor Oguru Kouji 8-1-1 Tsukaguchihonmachi, Amagasaki City Mitsubishi Electric Corporation Central Research Institute (72) Inventor Shoichi Yokoyama 8-1-1 Tsukaguchihonmachi, Amagasaki Mitsubishi Electric Corporation Central In the laboratory (72) Kenji Shimohata 8-1-1 Tsukaguchihonmachi, Amagasaki City Central Research Laboratory, Mitsubishi Electric Corporation (72 ) Inventor Kao Senoo 8-1-1 Tsukaguchihonmachi, Amagasaki-shi Central Research Laboratory, Mitsubishi Electric Corporation

Claims (12)

[Claims] 1. A superconducting magnet device comprising a superconducting coil, a cryostat for accommodating the superconducting coil and keeping the superconducting state, and an exciting power source for exciting the superconducting coil, wherein the superconducting coil is installed in the superconducting coil. A forced quench heater for forcibly quenching, a quench detector for detecting the quench of the superconducting coil, a forced quench heater power source for supplying a current to the forced quench heater at the time of quench detection, and the quench detector and the forced quench heater power source. A superconducting magnet device that is equipped with an uninterruptible power supply to operate. 2. At the time of a power failure, the uninterruptible power supply activates the forced quench heater power supply until the capacity of the uninterruptible power supply is reached, and the superconducting coil is quenched by supplying a current to the forced quench heater. The superconducting magnet device according to claim 1. 3. A superconducting magnet device comprising a superconducting coil, a permanent current switch, a cryostat accommodating them and keeping them in a superconducting state, and an exciting power source for exciting the superconducting coil, wherein the superconducting coil is installed on the superconducting coil. Forced quench heater that forcibly quenches the coil, quench detector that detects the quench of the superconducting coil, forced quench heater power supply that supplies current to the forced quench heater at the time of quench detection, and supply current to the heater of the permanent current switch. The permanent current switch heater power supply, and the quench detector and the uninterruptible power supply for operating each of the power supplies are provided, and at the time of a power failure, the uninterruptible power supply reaches the allowable capacity of the uninterruptible power supply. Operate the power supply, and the above permanent current switch heater A superconducting magnet device, characterized in that a current is applied to the coil to forcibly demagnetize the superconducting coil. 4. A cryostat for accommodating a superconducting coil and a permanent current switch and a current lead for attaching and detaching an exciting power source are provided, and the uninterruptible power source has the above-mentioned characteristics until the capacity of the uninterruptible power source is reached during a power failure. 4. The superconducting magnet according to claim 3, wherein the current lead is switched from the detached state to the attached state to operate the permanent current switch heater power supply, and a current is passed through the permanent current switch heater to forcibly demagnetize the superconducting coil. apparatus. 5. The detecting means for detecting a disconnection of the forced quench heater by supplying a small amount of current to the forced quench heater from the forced quench heater power source, according to any one of claims 1 to 4. Superconducting magnet device. 6. The superconducting coil comprises at least two or more superconducting coils, a forced quench heater is installed at each end of the superconducting coils, and when at least-the above superconducting coils are quenched, all the superconducting coils. The superconducting magnet device according to claim 1, wherein all the superconducting coils are forcibly quenched by supplying a current to the forced quench heater installed in the above. 7. The superconducting coil comprises at least two or more superconducting coils, the forced quench heater is installed in a direction orthogonal to each winding of the superconducting coils, and when at least one of the superconducting coils is quenched, 7. The superconducting magnet device according to claim 1, wherein a current is passed through the forced quench heater installed in the superconducting coils to forcibly quench all the superconducting coils. 8. A superconducting magnet device comprising an even number of superconducting magnets comprising a superconducting coil and a cryostat accommodating the superconducting coil and kept in a superconducting state connected in series via a room temperature lead. A superconducting magnet device characterized by performing quench detection by a three-terminal method by pressing. 9. A superconducting magnet device comprising a superconducting coil, a cryostat for accommodating the superconducting coil and keeping the superconducting state, and an exciting power source for exciting the superconducting coil, wherein the superconducting coil is connected in parallel with the exciting power source. A superconducting magnet device comprising a plurality of diodes connected in series so that the excitation voltage and the turn-on voltage are substantially equal to each other. 10. A superconducting magnet device comprising a superconducting coil, a quench protection diode installed in a cryogenic temperature, a cryostat for accommodating them and keeping them in a superconducting state, and an exciting power source for exciting the superconducting coil. A superconducting magnet device, wherein a plurality of diodes are connected in series at room temperature so that the voltage is lower than the voltage at which the cryogenic diode is turned on in parallel with the excitation power source. 11. A superconducting magnet device comprising a superconducting coil, a persistent current switch, a quench energy absorber, and a cryostat for accommodating them and keeping them in a superconducting state, wherein the permanent current switch is provided above the superconducting coil. A superconducting magnet device, wherein the energy absorber is arranged above the permanent current switch. 12. A first container containing a superconducting coil,
The second container, which has a larger volume than the first container, accommodates the permanent current switch and the quench energy absorber, and stores the refrigerant.
The container, the connecting pipe for connecting the first container and the second container, and the vacuum tank for keeping each of the container and the connecting pipe in a cryogenic state, and the second container above the first container. A superconducting magnet device, wherein the permanent current switch is arranged in a lower part of the second container, and the energy absorber is arranged in an upper part of the second container.