CN116994850B - Superconducting magnet exercise quench assisting and protecting device and superconducting magnet system - Google Patents
Superconducting magnet exercise quench assisting and protecting device and superconducting magnet system Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
- G01R33/1238—Measuring superconductive properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
- H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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Abstract
The invention discloses a superconducting magnet exercise quench assisting and protecting device and a superconducting magnet system, wherein the device comprises a coupling coil component, a current modulating component and a control component, wherein the coupling coil component adopts a coupling coil group or a coupling single coil, and the coupling coil component is arranged at the inner side of a corresponding position of a superconducting coil; the control component is used for controlling the current modulation component to introduce a first negative sine half-wave pulse current into the coupling coil component to generate a first pulse magnetic field in the process of lifting the superconducting magnet, so that the superconducting coil induces the pulse current under the action of the first pulse magnetic field, and the superconducting coil generates corresponding pulse ampere force under the combined action of the induced pulse current and the first pulse magnetic field of the coupling coil component, and further triggers the superconducting magnet to quench in advance to realize quench protection of the superconducting magnet. The invention can regulate and control the current of the superconducting magnet in a state of not contacting with the superconducting magnet, thereby realizing the safe and reliable exercise quench assistance and protection of the superconducting magnet.
Description
Technical Field
The invention belongs to the technical field of superconducting magnets, and particularly relates to a superconducting magnet exercise quench assisting and protecting device and a superconducting magnet system.
Background
The superconducting magnet is a magnet manufactured by using a superconducting material, and is capable of realizing zero-resistance current transmission by placing the magnet in a low-temperature environment such as liquid helium, and generating a magnetic field with high strength and high stability. At present, superconducting magnets are widely used in the fields of scientific research, medical treatment, energy sources, transportation and the like.
In the production of devices for manufacturing superconducting magnets, defects inevitably exist inside the superconducting magnets, limited by the process and material itself. In order to ensure that the superconducting magnet can normally operate, the superconducting magnet needs to be exercised for a plurality of times before being put into normal use.
The superconducting magnet needs to be subjected to exercise quench before being put into operation, and the aim is to eliminate defects in the manufacturing process of the superconducting magnet through multiple exercise quench, so that the risk of unexpected quench of the magnet in normal operation is reduced. For a wound superconducting magnet, the number of defects inside the superconducting magnet is fixed, and a plurality of defects are eliminated for each exercise. Exercise quench of superconducting magnets has one feature: the current corresponding to the next exercise quench is always higher than the last time for the same superconducting magnet. Based on this, in order to reduce the probability of quench during the operation of the superconducting magnet, the maximum current of the superconducting magnet is higher than the operating current during the normal operation of the magnet when the exercise is performed on the magnet.
The traditional exercise quench mode adopts a digital current source to excite a superconducting magnet, and the electromagnetic force born by a magnet coil is continuously increased in the process until the electromagnetic force reaches a critical value, and the internal defect of the magnet triggers quench. This approach, while simple, may be at a higher level of magnet current during a quench, which is detrimental to quench protection of the magnet and may result in a shortened magnet life.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a superconducting magnet exercise quench assisting and protecting device and a superconducting magnet system, which can enable the superconducting magnet to complete exercise quench at a lower current level and effectively prolong the service life of the magnet.
In order to achieve the above object, in a first aspect, the present invention provides a superconducting magnet exercise quench assisting and protecting device, comprising a coupling coil component, a current modulating component and a control component, wherein the coupling coil component is arranged in a low-temperature dewar cavity filled with a coolant, the coupling coil component is made of a high-conductivity material, a coupling coil group or a coupling single coil is adopted, the coupling coil component is arranged at the inner side of a corresponding position of a superconducting coil in the superconducting magnet, and the coupling coil component and the superconducting coil are coaxially and concentrically arranged;
the control component is used for controlling the current modulation component to introduce a first negative sine half-wave pulse current into the coupling coil component to generate a first pulse magnetic field in the process of exciting the lifting field for realizing exercise quench of the superconducting magnet, so that the superconducting coil induces the pulse current under the action of the first pulse magnetic field, and the superconducting coil generates corresponding pulse ampere force under the combined action of the induced pulse current and the first pulse magnetic field of the coupling coil component, and further triggers the superconducting magnet to quench in advance to realize exercise quench protection of the superconducting magnet; the amplitude of the first negative sine half-wave pulse current is not higher than 50% of the rated current of the coupling coil component, and when the superconducting coil current reaches the target working current, the amplitude of the first negative sine half-wave pulse current is not higher than 25% of the rated current of the coupling coil component.
In one embodiment, the current modulation component comprises a direct current source, a capacitor bank and a transistor bank, wherein the transistor bank adopts a pair of thyristors which are reversely connected in parallel, and the transistor bank is connected in series with the capacitor bank and then connected in parallel with the direct current source and the coupling coil component; the control component is used for controlling the on-off of the two thyristors to realize the on-off of the capacitor bank and the coupling coil component loop so as to introduce pulse current with required waveforms to the coupling coil component.
In one embodiment, the control component is further used for controlling the current modulation component to introduce a second negative sine half-wave pulse current to the coupling coil component to generate a second pulse magnetic field in the excitation field raising process of the superconducting magnet, so that the superconducting coil generates alternating current loss under the action of the second pulse magnetic field, and the alternating current loss causes the superconducting coil to quench in a large range, so that electromagnetic energy inside the superconducting magnet is uniformly converted into heat energy on the superconducting coil; the amplitude of the second negative sine half-wave pulse current is the current amplitude of the capacitor bank under the rated voltage.
In one embodiment, the superconducting magnet further comprises a quench detection component for detecting a quench state of the superconducting magnet, wherein when the quench detection component detects quench time of the superconducting magnet, the control component is used for controlling the current modulation component to supply step current to the coupling coil component and controlling the direct current source to clamp the current of the coupling coil component at a peak level when the current of the coupling coil component reaches a peak value;
When the quench detection component detects that the superconducting magnet is out of time at a low current level, the control component is used for controlling the current modulation component to introduce positive step current to the coupling coil component; when the quench detection component detects that the superconducting magnet is out of time at a high current level, the control component is used for controlling the current modulation component to introduce negative step current to the coupling coil component.
In one embodiment, the step current amplitude flowing into the coupling coil component is the current at the rated voltage of the capacitor bank.
In one embodiment, the superconducting coil excitation lifting field excites the superconducting coil through an external current source, and the current source is connected with the low-temperature superconducting switch and the diode integrated assembly in parallel; in the process of field rising of the superconducting coil, the low-temperature superconducting switch is in an off state, and the diode integrated component is used for avoiding overvoltage at two ends of a current source.
In one embodiment, the cryogenic dewar is made of an insulating composite material.
In a second aspect, the present invention provides a superconducting magnet system comprising a superconducting magnet exercise quench assistance and protection device as described above.
The superconducting magnet exercise quench assisting and protecting device and the superconducting magnet system provided by the invention have the following effects: (1) According to the invention, energy conversion is realized between the coupling coil component and the superconducting magnet in an electromagnetic induction mode, the superconducting magnet is assisted to exercise and quench, and protection is provided, in the process of rising a field of the superconducting coil exercise and quench, pulse current is induced in the superconducting coil by using the coupling coil component, meanwhile, a magnetic field generated by the coupling coil component is also overlapped in a space of the superconducting coil, vibration can be generated on the superconducting coil under the simultaneous action of the coupling coil component and the magnetic field, and the vibration can trigger the superconducting magnet to exercise and quench in advance, so that the magnet can exercise at a lower current level; (2) The traditional quench protection is that a heater is used for triggering quench of a larger range after the quench of a magnet to avoid damage of the superconducting magnet caused by overhigh temperature of a hot spot, and the method is limited by heat transfer efficiency of the magnet; (3) The current level of the superconducting magnet when the quench is not exceeded is not controlled, the device can control the current of the superconducting magnet through electromagnetic induction, and if the current level of the magnet is higher during quench, the device can be used for reducing the current of the magnet to protect the magnet; if the current level is lower during quench, the device can be used to raise the magnet current to trigger more defects at the same time, and the exercise frequency is reduced to avoid excessive waste of liquid helium.
Drawings
Fig. 1 is a sectional view of a superconducting magnet and an exercise quench-assist and protection device provided in an embodiment of the present invention in the axial direction of the superconducting magnet.
Fig. 2 is a cross-sectional view of a superconducting magnet and exercise quench-assist and protection device provided in another embodiment of the present invention in the axial direction of the superconducting magnet.
Fig. 3 is a circuit topology of a superconducting magnet and exercise quench assistance and protection device provided in an embodiment of the present invention.
Fig. 4 is a waveform diagram of current flowing into a coupling coil part according to an embodiment of the present invention; wherein, (a) is a current waveform diagram which is introduced into the coupling coil component for quench protection of the superconducting magnet; (b) Is a current waveform diagram which is introduced to the coupling coil part when the superconducting magnet is out of time at a low current level; (c) Is a waveform diagram of current that is passed to the coupling coil member when the superconducting magnet experiences a timeout at a high current level.
Reference numerals illustrate: 101 is a low-temperature Dewar refrigerant filling port, 102 is a low-temperature Dewar, 103 is a fixed support, 104 is a low-temperature Dewar current lead interface, 105 is a low-temperature Dewar pressure relief outlet, 106 is a coupling coil group, 107 is a coupling single coil, 108 is a capacitor group, 109 is a transistor group, 110 is a direct current source, 201 is an active shielding coil, 202 is a superconducting magnet coil, 203 is a superconducting magnet low-temperature container, 204 is a diode integrated component, 205 is a low-temperature superconducting switch, and 206 is a current lead.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
To solve the problem that the life of a magnet is shortened due to the fact that the conventional superconducting magnet exercises and quench at a higher current level, the invention provides a superconducting magnet exercise and quench assisting and protecting device, which comprises a low-temperature Dewar 102, a coupling coil component, a current modulation component and a control component.
The low-temperature dewar 102 and the superconducting magnet provided in this embodiment may adopt structures commonly used in the art, that is, the inner cavity of the low-temperature dewar 102 provided in this embodiment is filled with a low-temperature coolant, and the low-temperature dewar 102 is provided with a current lead interface 104, a refrigerant filling port 101 and a pressure release outlet 105; the superconducting magnet provided in this embodiment includes a superconducting coil 202, an active shielding coil 201, and a superconducting magnet cryogenic container 203.
The coupling coil component provided in this embodiment adopts the coupling coil set 106 (shown in fig. 1) or the coupling single coil 107 (shown in fig. 2), and when the current of one of the coupling coils 106 or the coupling single coil 107 changes, according to lenz's law, induced voltage and thus current change occur in the corresponding coupling coil to maintain the magnetic flux unchanged. Based on the above principle, the present embodiment generates a pulsed magnetic field by supplying a pulsed current to the coupling coil part, and regulates the current of the superconducting magnet using the pulsed magnetic field.
Specifically, referring to fig. 1 and 2, coupling coil components are respectively disposed at inner sides of corresponding positions of the superconducting coils 202, and the coupling coil components are coaxially and centrally overlapped with the superconducting coils 202, so that in order to more efficiently realize functions, large current can be introduced into the coupling coil components, and in order to avoid damage to the coils caused by excessive temperature rise, the coupling coil components can be immersed in low-temperature refrigerant in the inner cavity of the low-temperature dewar 102. Specifically, the coupling coil part and the cryogenic dewar 102 provided in the present embodiment may be fixed at a specified position using the fixing bracket 103, and the cryogenic dewar 102 and the fixing bracket 103 may be made of an insulating composite material.
The control component provided in this embodiment may use a control chip such as a single chip microcomputer or a DSP, which is commonly used in the art, to control the current modulation component to introduce a negative sine half-wave pulse current as shown in fig. 4 (a) into the coupling coil component to generate a magnetic flux change, and according to lenz's law, the magnetic flux change of the coupling coil component induces a current change on the superconducting coil, and under the combined action of the pulse magnetic field of the coupling coil component and the induced pulse current of the superconducting coil, the superconducting coil generates a corresponding pulse ampere force, so as to trigger the superconducting magnet to quench in advance to realize quench protection of the superconducting magnet.
In this embodiment, the control unit controls the current modulation unit to introduce the negative sine half-wave pulse current to the coupling coil unit only to induce current variation on the superconducting coil, so that vibration is generated inside the superconducting coil to trigger internal defects of the superconducting coil to cause quench of the superconducting magnet, so that the amplitude of the negative sine half-wave pulse current provided by this embodiment should be not higher than 50% of the rated current of the coupling coil unit. When the superconducting magnet current approaches the target operating current, in order to avoid damage to the magnet caused by excessive electromagnetic force, the pulse current amplitude should not be higher than 25% of the rated current of the coupling coil part.
Specifically, as shown in fig. 3, the current modulation component provided in this embodiment may adopt a topology structure composed of a dc current source 110, a capacitor bank 108 and a thyristor bank 109, where the thyristor bank 109 adopts a pair of thyristors connected in anti-parallel, and the thyristor bank 109 is connected in series with the capacitor bank 108 and then connected in parallel with the dc current source 110 and the coupling coil component. The control unit provided in this embodiment controls the on/off of the two thyristors to realize the on/off of the capacitor bank 108 and the loop of the coupling coil unit, so as to supply the pulse current with a desired waveform to the coupling coil unit.
In addition, the field lifting method of the superconducting magnet in the present embodiment to achieve exercise quench may be a field lifting method of excitation commonly used in the art, that is, the superconducting coil 202 is excited by an external current source. Preferably, the current source is connected in parallel with the low-temperature superconducting switch 205 and the diode integration assembly 204, wherein the low-temperature superconducting switch 205 is in an off state during the field up process of the superconducting coil, and the diode integration assembly 204 is used for avoiding overvoltage on two ends of the current source.
The superconducting magnet exercise quench assisting and protecting device provided by the embodiment is characterized in that pulse current is induced in a superconducting coil by utilizing a coupling coil component in the field rising process of the superconducting coil exercise quench, and meanwhile, a magnetic field generated by the coupling coil component is also overlapped in a space where the superconducting coil is located, vibration can be generated on the superconducting coil under the simultaneous action of the coupling coil component and the space, the vibration can trigger the superconducting magnet to exercise quench in advance, the magnet can complete exercise under a lower current level, and therefore the current of the superconducting magnet is regulated and controlled under a state of not contacting with the superconducting magnet, and safe and reliable exercise quench assisting and protecting of the superconducting magnet are realized.
For a more clear description of the invention, the following detailed description is provided in connection with specific embodiments:
The exercise quench assistance and protection device provided in this embodiment includes a low temperature dewar 102, a coupling coil set 106, a current modulation circuit, a control circuit, and a quench detection member, each of which is made of a weakly magnetic material (non-ferromagnetic material), the coupling coil set 106 being made of a high conductivity material.
As shown in fig. 3, in the process of exciting up the superconducting magnet to exercise quench, the superconducting magnet can be excited through the current lead 206 by an external current source, during which the cryogenic superconducting switch 205 is in an off state, and the diode assembly 204 is used for avoiding overvoltage at two ends of the current lead 206, if no external interference exists, the magnet can quench under the action of ampere force finally.
In order to avoid quench of the superconducting magnet at a higher current level, in this embodiment, during the field raising process of the superconducting magnet, the control component controls the on/off of the transistor group 109 to control the on/off of the capacitor group 108 and the loop of the coupling coil component, so as to introduce a negative sine half-wave pulse current with a waveform shown in fig. 4 (a) into the coupling coil component. According to Lenz's law, the magnetic flux change of the coupling coil component induces current change on the superconducting coil 202, and under the combined action of the pulse magnetic field of the coupling coil component and the induced pulse current of the superconducting coil 202, the superconducting coil 202 generates corresponding pulse ampere force, so that the superconducting magnet is triggered to quench in advance to realize protection of the superconducting magnet.
In this embodiment, the pulse current here is only to induce a current change on the superconducting coil 202 and thus generate vibrations inside the coil to trigger the internal defects of the coil to quench the superconducting magnet, so the pulse current amplitude should be not higher than 50% of the rated current of the coupled coil component. When the superconducting magnet current approaches the target operating current, in order to avoid damage to the magnet caused by excessive electromagnetic force, the pulse current amplitude should not be higher than 25% of the rated current of the coupling coil part.
When the superconducting magnet loses time, electromagnetic energy stored in the magnet is consumed in the form of heat energy, and is limited by heat transfer efficiency in the magnet, and the electromagnetic energy in the magnet cannot be uniformly converted into heat energy on the whole coil assembly and is concentrated in a partial area. In order to avoid damage to the magnet caused by too high local temperature, in the process of lifting the field of the superconducting magnet, the control component can control the on-off of the transistor group 109 to realize the control of the capacitor group 108 and the loop of the coupling coil component, so as to introduce a negative sine half-wave pulse current with the waveform shown in (a) in fig. 4 into the coupling coil component, and the pulse magnetic field generated by the pulse current acts on the superconducting coil to generate ac loss which is far higher than the ac loss in the process of lifting the field of the superconducting magnet, and the ac loss can cause the superconducting coil 202 to quench in a large range, so that electromagnetic energy is uniformly converted into heat energy on the superconducting coil 202.
In this embodiment, unlike the aforementioned pulse current that generates vibration inside the superconducting coil 202 to cause the magnet to quench, the pulse current here is to induce eddy currents on the superconducting coil 202 and the superconducting magnet cryogenic container 203, which can cause a large range of heat on the superconducting coil 202 and the superconducting magnet cryogenic container 203 to trigger the superconducting magnet to quench, and to achieve a larger heating value, the pulse current amplitude here is the current amplitude at the rated voltage of the capacitor bank 108 to achieve better quench protection for the superconducting magnet.
Superconducting magnet exercise quench is difficult to predict, and if the magnet is quenched at low current levels, excessive loss of liquid helium can result from the number of exercises, and if the magnet is quenched at high current levels, magnet safety can be compromised. In order to make the superconducting magnet quench at a more reasonable current level, the embodiment detects the quench state of the superconducting magnet in real time by using the quench detection component, and after detecting the quench of the superconducting magnet, controls the on-off of the thyristor group 109 by using the control component, thereby controlling the capacitor group 108 to supply a step current to the coupling coil component, and controls the direct current source 110 to clamp the current of the coupling coil component at the peak level when the current of the coupling coil component reaches the peak value, wherein the current waveform in the coupling coil component is as shown in (b) or (c) in fig. 4. According to Lenz's law, the magnetic flux change of the coupling coil component induces current change on the superconducting coil 202, when the magnet loses timeout at a low current level, a positive step current shown in (b) in fig. 4 is introduced into the coupling coil component by using the capacitor bank 108, the thyristor bank 109 and the direct current source 110, then voltage is induced on the superconducting coil 202, and thus current is increased, the increased current generates larger electromagnetic force which possibly triggers more defects in the magnet, a multiple exercise effect can be realized by one-time excitation, and the consumption of liquid helium is effectively reduced; when the superconducting magnet experiences a timeout at a high current level, a negative step current as shown in fig. 4 (c) is introduced into the coupling coil part by using the capacitor bank 108, the thyristor bank 109 and the dc current source 110, a voltage is induced on the superconducting coil 202, and thus the current is reduced, so that an excessive temperature rise of the magnet due to the quench is avoided to protect the magnet. Because of the lower electromagnetic induction efficiency, the step current amplitude that is passed into the coupling coil assembly during this process is the current at the rated voltage of the capacitor bank 108 for better control of the superconducting magnet current.
In general, the superconducting magnet exercise quench assisting and protecting device provided by the invention has the following effects: (1) According to the invention, energy conversion is realized between the coupling coil component and the superconducting magnet in an electromagnetic induction mode, the superconducting magnet is assisted to exercise and quench, and protection is provided, in the process of rising a field of the superconducting coil exercise and quench, pulse current is induced in the superconducting coil by using the coupling coil component, meanwhile, a magnetic field generated by the coupling coil component is also overlapped in a space of the superconducting coil, vibration can be generated on the superconducting coil under the simultaneous action of the coupling coil component and the magnetic field, and the vibration can trigger the superconducting magnet to exercise and quench in advance, so that the magnet can exercise at a lower current level; (2) The traditional quench protection is that a heater is used for triggering quench of a larger range after the quench of a magnet to avoid damage of the superconducting magnet caused by overhigh temperature of a hot spot, and the method is limited by heat transfer efficiency of the magnet; (3) The current level of the superconducting magnet when the quench is not exceeded is not controlled, the device can control the current of the superconducting magnet through electromagnetic induction, and if the current level of the magnet is higher during quench, the device can be used for reducing the current of the magnet to protect the magnet; if the current level is lower during quench, the device can be used to raise the magnet current to trigger more defects at the same time, and the exercise frequency is reduced to avoid excessive waste of liquid helium.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. The superconducting magnet exercise quench assisting and protecting device is characterized by comprising a coupling coil component, a current modulating component and a control component, wherein the coupling coil component is arranged in a low-temperature Dewar inner cavity filled with a coolant, the coupling coil component is made of a high-conductivity material and is provided with a coupling coil group or a coupling single coil, the coupling coil component is arranged on the inner side of a corresponding position of a superconducting coil in a superconducting magnet, and the coupling coil component and the superconducting coil are coaxial and are arranged in a center overlapping manner;
The control component is used for controlling the current modulation component to introduce a first negative sine half-wave pulse current into the coupling coil component to generate a first pulse magnetic field in the process of exciting the lifting field for realizing exercise quench of the superconducting magnet, so that the superconducting coil induces the pulse current under the action of the first pulse magnetic field, and the superconducting coil generates corresponding pulse ampere force under the combined action of the induced pulse current and the first pulse magnetic field of the coupling coil component, and further triggers the superconducting magnet to quench in advance to realize exercise quench protection of the superconducting magnet; the amplitude of the first negative sine half-wave pulse current is not higher than 50% of the rated current of the coupling coil component, and when the superconducting coil current reaches the target working current, the amplitude of the first negative sine half-wave pulse current is not higher than 25% of the rated current of the coupling coil component;
The current modulation component comprises a direct current source, a capacitor bank and a thyristor bank, wherein the thyristor bank adopts a pair of thyristors which are reversely connected in parallel, and the thyristor bank is connected in series with the capacitor bank and then connected in parallel with the direct current source and the coupling coil component; the control component is used for controlling the on-off of the two thyristors to realize the on-off of the capacitor bank and the coupling coil component loop so as to introduce pulse current with required waveforms to the coupling coil component.
2. The apparatus according to claim 1, wherein the control unit is further configured to control the current modulation unit to apply a second negative sinusoidal half-wave pulse current to the coupling coil unit to generate a second pulse magnetic field during a field raising process of the superconducting magnet, so that the superconducting coil generates ac loss under the action of the second pulse magnetic field, and the ac loss causes the superconducting coil to quench widely, so that electromagnetic energy inside the superconducting magnet is uniformly converted into thermal energy on the superconducting coil; the amplitude of the second negative sine half-wave pulse current is the current amplitude of the capacitor bank under the rated voltage.
3. The superconducting magnet exercise quench assistance and protection device according to claim 2, further comprising quench detection means for detecting a quench state of the superconducting magnet, the control means being adapted to control the current modulation means to apply a step current to the coupling coil means when the quench detection means detects a quench time of the superconducting magnet, and to control the dc current source to clamp the current of the coupling coil means at a peak level when the coupling coil means current reaches a peak value;
When the quench detection component detects that the superconducting magnet is out of time at a low current level, the control component is used for controlling the current modulation component to introduce positive step current to the coupling coil component; when the quench detection component detects that the superconducting magnet is out of time at a high current level, the control component is used for controlling the current modulation component to introduce negative step current to the coupling coil component.
4. A superconducting magnet exercise quench assistance and protection device according to claim 3 wherein the step current amplitude to the coupling coil assembly is the current at the rated voltage of the capacitor bank.
5. The superconducting magnet exercise quench assist and protection device of claim 1 wherein the superconducting coil excitation boost field excites the superconducting coil through an external current source, the current source being in parallel with the cryogenic superconducting switch and diode integrated assembly; in the process of field rising of the superconducting coil, the low-temperature superconducting switch is in an off state, and the diode integrated component is used for avoiding overvoltage at two ends of a current source.
6. The superconducting magnet exercise quench aid and protection device of claim 1 wherein the cryogenic dewar is made of an insulating composite material.
7. A superconducting magnet system comprising the superconducting magnet exercise quench assistance and protection device of any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310528018.8A CN116994850B (en) | 2023-05-10 | 2023-05-10 | Superconducting magnet exercise quench assisting and protecting device and superconducting magnet system |
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| CN202310528018.8A CN116994850B (en) | 2023-05-10 | 2023-05-10 | Superconducting magnet exercise quench assisting and protecting device and superconducting magnet system |
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| CN116994850A CN116994850A (en) | 2023-11-03 |
| CN116994850B true CN116994850B (en) | 2024-05-28 |
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| CN202310528018.8A Active CN116994850B (en) | 2023-05-10 | 2023-05-10 | Superconducting magnet exercise quench assisting and protecting device and superconducting magnet system |
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