Actively-shielding type experiment device of low-temperature superconducting magnet system

Abstract

The invention discloses an actively-shielding type experiment device of a low-temperature superconducting magnet system. The actively-shielding type experiment device comprises a vacuum sealing tank, a multi-layer heat insulating layer, an anti-radiation copper screen, a refrigerating machine, superconducting coils, a cold guide mechanism, suspended rod supporting mechanisms and a gas collection plate. The multi-layer heat insulating layer is located in the vacuum sealing tank, the anti-radiation copper screen is located in the multi-layer heat insulating layer, the superconducting coils are located in the anti-radiation copper screen and suspended onto a flange of the vacuum sealing tank through the suspended rod supporting mechanisms, a first-level cold end of the refrigerating machine located outside the vacuum sealing tank penetrates through the vacuum sealing tank, is in hot connection with the anti-radiation copper screen and provides cooling capacity, and a second cold end of the refrigerating machine penetrates through the anti-radiation copper screen and is connected with the superconducting coils through the cold guide mechanism, and the gas collecting plate is arranged on the first-level cold end of the refrigerating machine. By means of the actively-shielding type experiment device, the magnetic field environment outside the superconducting magnet coils can be actively shielded, the structure of the low-temperature superconducting magnet system is greatly simplified, flux leakage of a central magnetic field is lowered, and the shielding effect outside the low-temperature superconducting magnet system is improved.

Description

technical field [0001] The invention relates to the field of low-temperature refrigeration and superconducting magnets, in particular to an experimental device for an active shielding low-temperature superconducting magnet system. Background technique [0002] Certain metals and their alloys exhibit zero resistance at very low temperatures. A coil wound with a wire made of a material with such characteristics becomes a superconducting coil. Since the superconducting coil needs to be at an extremely low temperature when working, the traditional low-temperature superconducting magnet system generally immerses the superconducting coil in liquid helium to maintain the superconducting coil at 4.2K to ensure that the superconducting coil is in a superconducting state . [0003] As the only convenient cold source that can reach 4.2K, the boiling point of liquid helium is extremely low, and helium resources are extremely scarce. Liquid helium is generally liquefied through a larg...

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Problems solved by technology

[0007] In view of the complex structure, poor shielding effect and serious external magnetic flux leakage of the traditional low-temperature superconducting magnet system, the present invention designs an experimental device for an actively shielded low-temperature superconducting magnet system, which uses a refrigerator to directly cool the superconducting coil, so that The superconducting coil works at the superconducting temperature and can run stably

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