JPH11337631A - Strong magnetic field low-temperature device for measuring physical property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strong magnetic field low-temperature device for measuring physical properties, which is simple and easy in operation and is capable of reducing initial costs or running costs for cooling a sample, without the need for the filling and replenishment of a refrigerant such as liquid nitrogen or liquid helium. SOLUTION: Attention is focused on cooling a sample as well by a refrigerator 7 for cooling a superconducting coil 9. A strong magnetic field having the superconducting coil 9 cooled by the refrigerator 7 as a magnetic field source is made a space 3 which utilizes magnetic field. A strong magnetic field low- temperature device for measuring physical properties is for measuring the physical properties of a sample in the space 3 utilizing a magnetic field. A vacuum sample chamber 41 different from and independent of the vacuum vessel 6 of the superconducting coil 9 is formed in the space 3 which uses magnetic field by the superconducting coil 9. A sample holder 43, which is provided in the sample chamber 41 and to which the sample is installed is thermally connected to the cooling stage 7B of the refrigerator 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring low-temperature physical properties of a strong magnetic field, and more particularly to a strong magnetic field for measuring the properties of various substances (samples) in a magnetic field using a superconducting magnet apparatus as a magnetic field source. The present invention relates to a low-temperature physical property measuring device.

[0002]

2. Description of the Related Art Conventionally, various physical properties such as electric conductivity, Hall effect, and superconductivity of various substances have been measured under a strong magnetic field. As a magnetic field source of such a physical property measuring device, there is a so-called helium-free superconducting magnet device in which a superconducting coil is cooled by a refrigerator (for example, a GM refrigerator) without using liquid helium. There is a feature that a room for using a magnetic field at room temperature that can be easily accessed is obtained, and is used for various magnetic field applications. For example, a helium-free superconducting magnet device is widely applied as a device for evaluating physical properties (electrical conductivity, Hall effect, superconductivity) of a solid under a strong magnetic field. However, in these measurement experiments, it is often necessary to cool the test piece (sample) to a very low temperature, and the conventional low-temperature physical property measuring apparatus has various problems in the mechanism for cooling the sample.

[0003] For example, FIG. 3 is a cross-sectional view showing a high-field low-temperature property measuring apparatus 1 cooled by using liquid nitrogen.
The high-field low-temperature physical property measuring device 1 is composed of a superconducting magnet device 2
Magnetic field utilization space 3 which is a strong magnetic field by
And a sample mounting unit / measuring unit 5.

The superconducting magnet device 2 includes a vacuum vessel 6
, A GM refrigerator 7, a heat shield plate 8, a superconducting coil 9, and a current lead 10, and the central bore of the superconducting coil 9 is the magnetic field utilization space 3.

The vacuum vessel 6 includes a first cooling stage 7A (for example, a high-temperature cooling stage having a temperature of 60K) and a second cooling stage 7B (for example, a low-temperature cooling stage having a temperature of 4K) of the GM refrigerator 7; The heat shield plate 8, the superconducting coil 9, and the current lead 10 are kept in a vacuum insulated state.

The GM refrigerator 7 includes a first cooling stage 7A as a heat shield plate 8 and a second cooling stage 7B.
Are thermally connected to the superconducting coil 9, respectively, and the superconducting coil 9 can be cooled to a very low temperature without using liquid helium, and can be brought into a superconducting state.

The heat shield plate 8 includes a second cooling stage 7
B and the superconducting coil 9 are accommodated to prevent heat intrusion due to external heat radiation.

The liquid nitrogen container 4 has a liquid nitrogen inlet 1
The sample 1 is filled with liquid nitrogen 12, and the sample mounting part and the measuring part 5
Is cooled to a predetermined low temperature.

A high-field low-temperature physical property measuring apparatus 1 having such a configuration
However, since the liquid nitrogen 12 is used to generate and maintain a low temperature, there are problems such as difficulty in adjusting the temperature and the need to replenish the liquid nitrogen 12.

FIG. 4 is a cross-sectional view of a high-field low-temperature physical property measuring apparatus 20 for cooling using liquid helium. A liquid helium circulation container 21 is disposed therein, and the liquid helium 24 is brought into thermal contact with the sample 13 from the liquid helium container 22 via the helium circulation pipe 23 so that the sample 13 can be cooled to a predetermined low temperature.

A high-field low-temperature physical property measuring apparatus 2 having such a configuration
In the case of 0, the sample 13 is cooled by circulating the liquid helium 24 in the helium circulation pipe 23, but there is a problem that the expensive liquid helium 24 must be used.

FIG. 5 is a cross-sectional view of another type of high-temperature low-temperature physical property measuring apparatus 25 for cooling using liquid helium. Helium 24 is supplied from a helium supply pipe 27, and the sample 13 is cooled by circulating the evaporative gas.

A high-field low-temperature physical property measuring apparatus 2 having such a configuration
In No. 5, there is a problem that liquid helium 24 needs to be replenished and expensive liquid helium 24 must be used.

FIG. 6 is a cross-sectional view of another type of high-temperature low-temperature physical property measuring apparatus 30.
0, another refrigerator (the second GM refrigerator 31) and the second GM refrigerator 31 are placed above the magnetic field utilization space 3 of the superconducting magnet device 2 with the magnetic field of the superconducting magnet device 2. And a holding and moving mechanism 32 for movably holding the space toward the use space 3.

The second GM refrigerator 31 has a heat shield plate 34 thermally connected to the first cooling stage 31A located in the vacuum vessel 33, and the second cooling stage 31
Sample holder 35 is thermally connected to B. The sample 13 (temperature measuring resistor) and the resistance heater 36 are attached to the tip of the sample holder 35, and the temperature of the sample holder 35 and the sample 13 can be arbitrarily set and changed by controlling the resistance heater 36. There is.

A high-temperature low-temperature physical property measuring apparatus 3 having such a configuration
At 0, the entire second GM refrigerator 31 is moved up and down toward the magnetic field utilization space 3 of the superconducting magnet device 2 by operating the holding / moving mechanism 32, and the sample 13 is positioned in the magnetic field utilization space 3 to obtain the low-temperature physical properties. Measurement.
High magnetic field low temperature physical property measuring apparatus 1 (FIG. 3), high magnetic field low temperature physical property measuring apparatus 20 (FIG. 4) or high magnetic field low temperature physical property measuring apparatus 2
Although the replenishment of the refrigerant and other problems as shown in FIG. 5 (FIG. 5) are solved, an increase in the initial cost and the running cost of the second GM refrigerator 31 is a major problem. Further, since it is necessary to further house another vacuum vessel 33 in the magnetic field utilizing space 3 of the superconducting magnet device 2, there is a problem that the space of the sample holder 35 occupying the magnetic field utilizing space 3 becomes small.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a strong magnetic field low-temperature property measuring apparatus capable of setting the temperature of a sample for measurement to an arbitrary low temperature. Make it an issue.

It is another object of the present invention to provide a high-temperature low-temperature physical property measuring apparatus which does not require filling and replenishment of a refrigerant such as liquid nitrogen or liquid helium, and is easy and easy to operate.

Another object of the present invention is to provide an apparatus for measuring high-temperature low-temperature physical properties which can reduce the initial cost or running cost for cooling a sample.

Another object of the present invention is to provide a high-field low-temperature physical property measuring apparatus which can take a larger space for utilizing a magnetic field for mounting a sample.

[0021]

That is, the present invention focuses on cooling a sample by a refrigerator for cooling a superconducting coil. The sample is provided in a vacuum vessel and cooled by a refrigerator. A strong magnetic field low-temperature physical property measuring device for measuring a physical property of a sample in a magnetic field utilizing space using a strong magnetic field using a superconducting coil as a magnetic field source, wherein the superconducting coil is provided in the magnetic field utilizing space by the superconducting coil. A vacuum sample chamber is formed independently of the vacuum vessel of the coil, and a sample holder provided in the sample chamber and for mounting the sample is thermally connected to a cooling stage of the refrigerator. It is a magnetic field low temperature physical property measuring device.

The sample chamber is divided into a sample chamber front chamber on the outer lid side and a sample chamber main body, and a gate valve operable from outside is provided between the sample chamber main body and the sample chamber front chamber. While maintaining the sample chamber body in a vacuum state,
The sample chamber front chamber can be exposed to the atmosphere.

A sample manipulator for externally performing an operation of mounting the sample in the sample chamber to the sample holder; and a viewing window for performing the mounting operation on an outer lid of the sample chamber. Can be.

The sample holder can be brought into thermal contact with the cooling stage of the refrigerator through a thermal switch.

The above-mentioned heat switch is composed of a first heat transfer member and a second heat transfer member having good heat conductivity, such as copper, and a stainless steel member for connecting the first and second heat transfer members. Or a low thermal conductive tubular member such as GFRP,
And a helium gas pipe connected to the hermetic container so as to be capable of being filled with helium gas therein and preferably communicating with the outside in order to adjust the internal pressure. it can.

The measuring electric wire connected to the sample can be connected to an external measuring instrument via a vacuum-tight introduction terminal provided on the outer lid of the sample chamber.

The connector for connecting the measuring wire connected to the sample in the sample chamber and the wire previously wired in the superconducting magnet device having the superconducting coil and connected to an external measuring instrument is connected with the connector described above. It can be installed on the sample holder in the sample chamber.

A manipulator for externally connecting the connector can be provided on the outer lid of the sample chamber.

In the apparatus for measuring low-temperature physical properties of a strong magnetic field according to the present invention, since the sample is cooled simultaneously with the superconducting coil by a refrigerator such as a GM refrigerator of a superconducting magnet device, the operation is simple and easy. The measurement can be performed at low cost without using a special cryogen such as liquid nitrogen or liquid helium.

Further, since the space using the magnetic field of the superconducting magnet device can be used as a sample accommodating set portion, there is no need to reduce the space using the magnetic field, and low-temperature physical properties of a sample of an arbitrary size can be measured. . In addition, by interposing a thermal switch between the sample and the cooling stage, the sample can be cooled to any temperature and the superconducting coil does not need to be released even when the sample is replaced. In addition, the efficiency of the re-cooling operation can be improved. Further, if the sample chamber is divided into a sample chamber front chamber and a sample chamber main body and a gate valve is provided therebetween, the vacuum state of the sample chamber is maintained and only the sample chamber front chamber can be released from vacuum or open to the atmosphere. In addition to minimizing heat intrusion at the time of sample exchange, the evacuation operation can be performed efficiently.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a high-field low-temperature physical property measuring apparatus 40 according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIGS. 3 to 6 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG.
FIG. 2 is a cross-sectional view of the high-field low-temperature property measuring apparatus 40. The high-field low-temperature property measuring apparatus 40 includes a sample chamber 41 formed of a magnetic field utilization space 3 in which a strong magnetic field is generated by the superconducting magnet device 2, and a heat switch 42. And the sample holder 43,
A vacuum seal gate valve and other gate valves 44 and a manipulator 45 for operating the valve, a sample manipulator 46, an outer lid 47, a vacuum airtight introduction terminal 48,
An on-off valve 49.

The sample chamber 41 is held in a vacuum-insulated state by the vacuum vessel 6 and the outer lid 47 in the superconducting magnet device 2, and the partition 50 is used to hold the inner sample chamber main body 51 and the sample on the outer lid 47 side. It is divided and formed into two chambers including a front chamber 52. The heat switch 42 and the sample holder 43 are housed inside the sample chamber main body 51, and the gate valve 44 and the valve manipulator 45 are housed inside the sample chamber front chamber 52. The sample chamber 41 is a vacuum adiabatic tank that is separate and independent from the vacuum container 6 of the GM refrigerator 7. That is, the vacuum vessel inner tube 53 of the vacuum vessel 6 is used as the outer wall of the sample chamber 41, and is made of a material having low thermal conductivity and no magnetism, such as stainless steel (SU).
S304) or GFRP (glass reinforced fiber resin) is used.

The heat switch 42 is connected to the object to be cooled (sample 13).
It connects and disconnects thermal contact between the GM refrigerator 7 and the second cooling stage 7B of the GM refrigerator 7. Examples of the heat switch 42 include a mechanical heat switch that mechanically moves a heat transfer member made of copper or the like to adjust thermal contact, a gas heat switch, and the like.

For example, FIG. 2 is a schematic sectional view showing a gas-type heat switch 42 which is more preferable in the present invention. The heat switch 42 includes an airtight container 54 and a helium gas pipe 5.
And 5.

The airtight container 54 is made of stainless steel or G
The first heat transfer member 57 and the second heat transfer member 57 made of FRP or the like, which have low heat conductivity,
And the heat transfer member 58. That is, the first heat transfer member 57 and the second heat transfer member 5
8 and a plurality of high heat conductive fins 60 (plates) such as copper are respectively provided in the closed space 59 from the first heat transfer member 57 and the second heat transfer member 58. The heat exchange efficiency at the time of gas filling is improved.

Helium gas can be supplied from an external helium gas supply source (not shown) to the closed space 59 via a helium gas pipe 55 and an on-off valve 61, and the internal pressure, that is, heat exchange, is determined by the amount of helium gas. The efficiency can be controlled. That is, when very weak thermal contact is required between the second cooling stage 7B and the sample holder 43 in the thermal switch 42, a gas pressure of about several tens Pa may be used, and a stronger thermal contact is required. In such a case, the pressure may be increased.

As shown in FIG. 2, the sample holder 43 sets the sample 13 and an arbitrary physical property measuring sensor 62 here.
It is in thermal contact with the second cooling stage 7B of the refrigerator 7.
The sample holder 43 is provided with a temperature sensor 63 and a resistance heater 64, and is connected to an external temperature indicator and a temperature controller (not shown). The gate valve 44
For attaching to a vacuum vessel 6 (vacuum vessel inner cylinder 53),
Alternatively, a temperature sensor and a resistance heater (both not shown) are similarly attached to the gate valve 44 to enable external temperature measurement and temperature control.

The measuring wire 65 from the physical property measuring sensor 62 in the sample holder 43 is connected to an external measurement control device (not shown) from the vacuum airtight introduction terminal 48 through the partition wall 50. As a connection structure of the measuring wire 65 in the present invention, in addition to the above, a wire previously wired between an external measurement control device and the superconducting magnet device 2 and a distal end of the wire are connected. And a connector (both not shown). This connector is placed on the sample holder 43, and the measuring wire 65 is connected to the connector. However,
In the case of this connection structure, the measuring electric wire 65 attached to the sample 13 from the outside by the sample manipulator 46 is used.
Must be connected to the connector of the sample holder 43.

The gate valve 44 opens and closes a through-hole 66 formed in the partition wall 50. The gate valve 44 is operated by an externally operable valve operating manipulator 45 to move the sample chamber 41 and the sample chamber body 51 and The sample chamber front chamber 52 can be divided into two parts, or the sample chamber main body 51 and the sample chamber front chamber 52 can communicate with each other.

The sample manipulator 46 includes the outer lid 4.
7 through the viewing window 67 formed in the sample holder 4.
3 is for setting the sample 13.

A vacuum exhaust port 68 is formed in the outer lid 47 in addition to the viewing window 67, and the sample chamber 41 (the sample chamber body 51, the front of the sample chamber) is opened via an open / close valve 49 by a vacuum exhaust device (not shown). The chamber 52) is evacuated and the sample chamber front chamber 5 is evacuated.
2 can be opened to the atmosphere.

A high-field low-temperature physical property measuring apparatus 4 having such a configuration
0, first, in a state where the sample 13 is set in the sample chamber 41 (the sample chamber main body 51), the sample chamber 41 is vacuum-sealed by the outer lid 47, the gate valve 44 is opened, and the outer lid 4 is opened.
The whole of the sample chamber 41 (the sample chamber main body 51 and the sample chamber front chamber 52) is evacuated by evacuating the vacuum from the evacuation port 68 on the upper side. The heat switch 42 is filled with helium gas, and the sample holder 43 is mounted on the GM refrigerator 7.
Is cooled to a temperature of 4K by the second cooling stage 7B.

In this state, any physical property of the sample 13 is measured.
Among the heat penetrating into B, the increase in the magnetic field utilization space 3 as compared with the conventional superconducting magnet device 2 (FIG. 3) in which the space 3 is in the air core state is due to the vacuum vessel 6 and the sample chamber of the superconducting magnet device 2 The heat invaded by the heat conduction of the partition wall 50 that separates the sample holder 41 from the sample holder 43, and the heat entered from the sample holder 43 through the thermal switch 42. These penetrating heats are very small and GM
This can be dealt with by operating the refrigerator 7 with an increased cooling function.

The procedure for replacing the sample 13 and the state and operation of each part at that time will be described below. First, the helium gas in the heat switch 42 is exhausted, and the heat switch 42 is turned off. This off state reduces heat intrusion into superconducting coil 9 generated when sample 13 is replaced, and shortens the recooling time.

By manipulating the sample manipulator 46 through the outer lid 47, the sample 13 is placed in the sample holder 4
3 and the sample chamber front chamber 5 outside the gate valve 44.
After being pulled out to 2, the gate valve 44 is closed. Further, the temperature of the gate valve 44 is heated to a normal temperature by a temperature controller and a resistance heater attached to the gate valve 44, thereby preventing the gate valve 44 from icing or contaminating. At this time, heat entering the second cooling stage 7B increases, and the temperature of the superconducting coil 9 rises. However, since there is no need to generate a strong magnetic field by the superconducting coil 9 during the exchange of the sample 13, there is a special problem. Absent.

As described above, the sample 13 is drawn out to the sample chamber front chamber 52 and the gate valve 44 is closed. When the temperature of the gate valve 44 rises, the atmosphere or nitrogen gas or the like is discharged from the vacuum exhaust port 68 of the outer lid 47. The drying gas is introduced into the sample chamber front chamber 52, and the outer lid 47 is opened.

The procedure for installing a new sample 13 is the reverse of the above-described removal procedure. The sample 13 attached to the sample manipulator 46 is put into the sample chamber front chamber 52 and the outer lid 47 is placed.
Close. Evacuation is performed from the evacuation port 68 of the outer lid 47, and when a predetermined degree of vacuum (equivalent to that of the sample chamber main body 51) is reached, the temperature control of the gate valve 44 is stopped, and the gate valve 44
open. The sample 13 is controlled by the sample manipulator 46.
Is set on the sample holder 43, and the sample manipulator 46 is separated from the sample 13. Then heat switch 4
2 is filled with helium gas to turn it on, and the sample 13 is cooled by the second cooling stage 7B.

It should be noted that in the high-field low-temperature physical property measuring apparatus 40 according to the present invention,
In FIG. 6, the vacuum container 33 and the heat shield plate 34 of the second GM refrigerator 31 that are present between the superconducting coil 9 and the sample chamber 41 can be omitted, and as a result, the same inner diameter The sample holder 43 can be made larger than the superconducting magnet device 2.

[0049]

As described above, according to the present invention, the sample is cooled to a predetermined low temperature by the cooling stage of the refrigerator in the superconducting magnet device. Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a high-field low-temperature property measuring apparatus 40 according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing the gas type thermal switch 42;

FIG. 3 is a cross-sectional view showing a conventional high-field low-temperature physical property measuring apparatus 1 cooled using liquid nitrogen.

FIG. 4 is a cross-sectional view of a conventional high-field low-temperature physical property measuring apparatus 20 for cooling using liquid helium.

FIG. 5 is a cross-sectional view of a conventional high-field low-temperature property measuring apparatus 25 that cools using liquid helium.

FIG. 6 is a cross-sectional view of a conventional high-field low-temperature physical property measuring apparatus 30 that cools using another refrigerator (second GM refrigerator 31).

[Explanation of symbols]

Reference Signs List 1 Strong magnetic field low-temperature physical property measurement device cooled with liquid nitrogen (Fig. 3) 2 Superconducting magnet device 3 Magnetic field utilization space with strong magnetic field 4 Liquid nitrogen container 5 Sample mounting and measuring unit 6 Vacuum container 7 GM refrigerator ( Gifford McMahon refrigerator 7A First cooling stage of GM refrigerator 7B Second cooling stage of GM refrigerator 7 8 Heat shield plate 9 Superconducting coil 10 Current lead 11 Liquid nitrogen inlet 12 Liquid nitrogen (FIG. 3) Reference Signs List 13 Sample 20 High-temperature low-temperature physical property measuring device for cooling using liquid helium (FIG. 4) 21 Container for liquid helium circulation 22 Liquid helium container 23 Helium circulation pipe 24 Liquid helium (FIGS. 4 and 5) 25 Liquid helium High-field low-temperature physical property measurement device that cools by utilizing (Fig. 6) 26 Liquid helium container 27 Helium supply pipe 30 Other refrigeration (2nd GM refrigerator 31) Cooling using strong magnetic field low-temperature physical property measurement device (FIG. 6) 31 Second GM refrigerator 31A First cooling stage 31B of second GM refrigerator 31 Second cooling stage 32 of GM refrigerator 31 of the above 32 Holding and moving mechanism 33 Vacuum container 34 Heat shield plate 35 Sample holder 36 Resistance heater 40 Strong magnetic field low temperature physical property measuring device (embodiment, FIG. 1) 41 Sample chamber 42 Gas type Heat switch (FIGS. 1 and 2) 43 Sample holder 44 Gate valve (vacuum seal gate valve) 45 Manipulator for valve operation 46 Manipulator for sample 47 Outer lid 48 Vacuum airtight introduction terminal 49 On-off valve 50 Partition wall 51 Sample Room main body 52 Sample chamber front chamber 53 Vacuum vessel inner cylinder of vacuum vessel 6 Airtight vessel 55 Helium gas pipe 56 Stainless steel or GF Low heat conductive cylindrical member made of P or the like 57 First heat transfer member made of copper or the like 58 Second heat transfer member made of copper or the like 59 Closed space 60 Fin 61 Open / close valve 62 Physical property measurement sensor 63 Temperature sensor 64 Resistance heater 65 Measurement wire 66 Through window 67 Viewing window 68 Vacuum exhaust port

Claims (8)

[Claims] A strong magnetic field low-temperature physical property measuring apparatus for measuring a physical property of a sample in a magnetic field utilizing space, wherein a strong magnetic field using a superconducting coil provided in a vacuum vessel and cooled by a refrigerator is used as a magnetic field source. In the magnetic field utilization space by the superconducting coil, a vacuum sample chamber is formed separately from the vacuum container of the superconducting coil, and a sample holder provided in the sample chamber and for mounting the sample is provided by the freezing. A strong magnetic field low-temperature physical property measuring device, which is thermally connected to a cooling stage of the machine. 2. A gate operable from the outside between the sample chamber main body and the sample chamber front chamber while dividing the sample chamber into two parts, a sample chamber front chamber on the outer lid side and a sample chamber main body. 2. The apparatus for measuring low-temperature physical properties of a strong magnetic field according to claim 1, wherein a valve is provided so that the sample chamber front chamber can be exposed to the atmosphere while the sample chamber main body is maintained in a vacuum state. 3. A sample manipulator for externally performing an operation for mounting the sample in the sample chamber to the sample holder, and a view window for performing the mounting operation on an outer lid of the sample chamber. The high-temperature low-temperature physical property measuring apparatus according to claim 1, further comprising: 4. The apparatus according to claim 1, wherein the sample holder is brought into thermal contact with a cooling stage of the refrigerator via a thermal switch. 5. The heat switch comprises: a first heat transfer member and a second heat transfer member having good heat conductivity, and a low heat conductivity connecting between the first and second heat transfer members. 5. An airtight container formed by said cylindrical member, and a helium gas pipe connected to said airtight container so that the inside thereof can be filled with helium gas and communicated with the outside thereof. A high-temperature low-temperature physical property measuring apparatus as described in the above. 6. The measuring wire connected to the sample is connected to an external measuring instrument via a vacuum airtight introduction terminal provided on an outer lid of the sample chamber.
A high-temperature low-temperature physical property measuring apparatus as described in the above. 7. A connector for connecting a measuring wire connected to the sample in the sample chamber and a wire previously wired in a superconducting magnet device having the superconducting coil and connected to an external measuring instrument. 2. The apparatus for measuring low-temperature physical properties at high magnetic field according to claim 1, wherein the apparatus is installed at a portion of the sample holder in the sample chamber. 8. An apparatus for measuring low-temperature physical properties at high magnetic field according to claim 7, wherein a manipulator for externally performing a connection operation between said connector and said electric wire for measurement is provided on an outer lid of said sample chamber. .