JPS58147198A - Magnetically shielding method of electronic device operated in cryogenic state - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for magnetically shielding electronic equipment operating in cryogenic conditions.

Background of the TechnologyIn the field of information processing or scientific computing performed using electronic computing, as the amount of information processed or the amount of computing processing increases and becomes more sophisticated, the performance of electronic computers, especially computing processing, increases. There is a strong demand for faster speeds.

For this reason, the semiconductor integrated circuit WII based on the Nrico Y(81)Q has been commonly applied as a functional element constituting the central processing unit or storage device of the electronic computer.
Instead of the device, it is desired to realize an electronic computer using the Jishu Sefunnkiko.

Such electronic devices have a switching speed of approximately log:ps), which is more than 100 times faster than conventional silicon semiconductor integrated circuits. Effective as a functional element.

PRIOR ART AND PROBLEMS The electric meter line used as a functional element in the 1st generation 1st 7th element is used for driving and controlling the 1st generation element.
For example, liquid helium (if (4-2C0<3)) must be kept at an extremely low temperature and placed in a low magnetic field with a strength of IA and 81 degrees of the earth's magnetic field.

The Sefson device used as a functional element in an electronic computer as a means to maintain it in a cryogenic state.

The electronic meter can be immersed in liquid helium contained in a container. However, 18-8 stainless steel, which is conventionally used as a liquid helium container,
Since glass or glass fiber is a non-magnetic material, it cannot effectively shield (magnetic shield) from external magnetic fields such as earth's magnetism.

Conventionally, it has been proposed to perform magnetic shielding by utilizing the Meissner effect in superconducting materials such as niobium (Nb) and lead (Pb). (for magnetic field).

The shielding effect is sufficient and there are no borders.

OBJECTS OF THE INVENTION The present invention is housed in a container made of the non-magnetic material and kept immersed in a cooling liquid. The present invention attempts to provide a complete method for effectively blocking external magnetic fields such as terrestrial magnetism for electronic devices that operate at extremely low temperatures, such as electronic computers, that use di-cefnon elements as functional elements.

DESCRIPTION OF THE INVENTION Therefore, according to the present invention, at least one Helmholck coil is provided outside a housing container in which an electronic device operating in a cryogenic state and a cooling liquid for cooling the electronic device are accommodated. Provided is a magnetic shielding method for electronic equipment operating at extremely low temperatures, characterized in that the Helmholtz coil generates magnetic field sound in a direction that cancels out an external magnetic field r.

Examples of the invention Hereinafter, the present invention will be explained in detail with reference to Examples.

The figure shows a cooling liquid storage container equipped with the magnetic shielding method according to the present invention, and a nine-electronic computer system in which the cooling liquid contained in the storage container is used as a functional element of a diversion device.

In the figure, 11 is a storage container, and 12 is the storage container l.
A cooling liquid such as liquid helium is housed in the cooling liquid 12, 13 is an electronic computer using a digital camera immersed in the cooling liquid 12, and 14 is an electronic computer 4.
! i! Reference numeral 13 indicates an input/output cable, and reference numeral 15 indicates a superconducting magnetic shielding body disposed surrounding the electronic computer 13 in the cooling liquid. Furthermore, 16a, 16b,
17a, 17bMUKl 8a, 1a bH are Helum phorthocoils, respectively.

The container 11 has a diameter of 18 mm, for example.
It is made of -8 stainless steel material and has a double structure, although not shown. The internal space Fi of such a double structure
It is a heat insulating layer with a vacuum or so-called super insulation structure.

Although this is also not shown, the upper opening of the storage container is sealed by a lid that also has a double structure. The input/output cable of the computer is introduced and led out through a hole provided in the lid.

In addition, the superconducting magnetic shield 15 has niobium (N
b) composed of lead (pb) or an alloy thereof,
The magnetic shielding effect is caused by the so-called Meissner effect. (Kaka/) Superconducting magnetic shield 15σ is well known, but for example, it is #2il against direct current magnetic field (magnetic field) such as geomagnetism.
The I-shielding effect is not sufficient.

According to the present invention, further around the cooling container,
For example, three sets of Helmholk coils 16a.

16b, l'i't) and l 8 a, l 8
bt-fif file.

and at least one Helmholtz coil among such three Helmholtz coils.

A magnetic field (magnetic field) in the opposite direction to an external magnetic field (magnetic field) such as earth's magnetism
? A current is passed to generate E~, and the magnetic field generated from the Herzholtz coil cancels out an external magnetic field such as earth's magnetism.

For example, when canceling the earth's magnetic field (strength 03 to 04 Gauss), a current of about 50 [mA3] is applied to a Helmholtz coil with a winding of 150 turns. By this, the influence of the earth's magnetic field can be effectively reduced to, for example, about 1/10'.

As a result, the influence of external magnetic fields such as terrestrial magnetism on the electronic computer having the Shirosef sono element as a functional element is extremely reduced.

The direction and strength of the external magnetic field such as geomagnetism can be detected by
Electronic meter 1i- using a double-sided electronic device as a functional element
This is carried out by a friendly magnetism detection device such as a d Q e I D device attached to the enclosure of the rock 13 or the like.

In the above embodiment, three sets of Helmholtz coils are arranged around the cooling liquid storage container, and the magnitude and direction of the external magnetic field such as the earth's magnetism is determined by the electric current flowing through the Helmholtz coils. Although a case has been described in which changes are made to correspond to the above, the present invention is not limited to such a configuration.

For example, the Helmholtz coils 18a and 18b may be omitted and the Helmholtz coils 17a and 17bi may be rotated along the cylindrical outer peripheral surface of the container 11.

- Helmholtz coils 17a, 17bk %
If omitted, the Helmholtz coils 16a and 16b may be rotated along the entire surface of the container 11.

Effects of the Invention As described above, according to the present invention, at least 1% of the Helmholtz liquid is added to the outside of the container containing the cooling liquid in which the electronic computer serving as the functional element is immersed. By arranging a coil and causing the Helmholtz coil to generate a magnetic field of a direction and intensity that cancels out the external magnetic field of other magnetic forces, the above-mentioned diagonal Sefson element? Functional elements can be stably driven and controlled by electronic computers.

[Brief explanation of the drawing]

The figure is a partially cutaway perspective view showing an example of a magnetic shielding structure for an electronic device operating in a cryogenic state according to the present invention. In the figure, 11... Cooling liquid storage container 1
2...Cooling liquid 13...Electronic computer using Girosefuso/Cuiko as a functional element 14... Attractive cable 15... Superconductivity Magnetic shielding bodies 16a, 16b, 17a, l'7b and 18a, 18b... Helmholtz coil

Claims (1)

[Claims] At least one Helmholtz coil holder is disposed outside a containment container containing electronic equipment operating at extremely low temperatures and a cooling liquid for completely cooling the electronic equipment, and an external magnetic field is applied to the Helmholtz coil. A magnetic shielding method for electronic equipment operating at extremely low temperatures, characterized by generating magnetic field sound in canceling directions.