SU1499409A1 - Arrangement for screening-out superconducting device - Google Patents

Abstract

The invention relates to the field of technical physics, in particular, to the field of shielding devices containing superconducting (SP) materials from external magnetic fields. The purpose of the invention is to increase the efficiency of shielding when the superconducting device is repeatedly moved from the unshielded area to the shielded one. In creostat 1 with a liquid refrigerant, a chamber 2 with vacuum-insulated walls is placed, the bottom of chamber 2 being in thermal contact with the liquid refrigerant. The lid 3, which seals the open entrance of the chamber, has a rod 4, sealed and movable in it. The inlet 5 on the lid 3 serves to inject the gaseous coolant, for example gels, into the chamber 2. The device containing the joint venture elements is placed at the end of the rod in the upper part of chamber 2. After inlet through the inlet 5 of the heat transfer medium, a heater 6 is fixed on the inner surface of chamber 2 at the upper edge of the multilayer screen 7 of a material immersed in a cryostat liquid refrigerant and moved rod 4. The device moves from the unshielded part of chamber 2 to the part enclosed by screen 7 at a temperature above the critical one; therefore, SP currents do not appear in its elements due to the presence of external fields in unshielded asti. Electric heater 6 is turned off, and the device enters the joint venture state inside the screen, free from the "frozen" floor. 1 il.

Description

31499409

measures, has a rod 4, fortified in it tightly and movably. The inlet 5 on the cover 3 serves to introduce the gaseous coolant into the chamber 2, for example gels. The device containing the joint venture elements is placed at the end of the rod in the upper part of chamber 2. After the inlet through the inlet 5, the heat transfer medium includes a heater 6 fixed on the inner surface of chamber 2 at the level of the upper edge of the multi-layer screen 7 of a material immersed in liquid refrigerant. cryostat, and move the rod 4. The device moves from the unscreened & part of chamber 2 to the part enclosed by screen 7 when the temperature is higher than the critical one, therefore there are no SP currents in its elements due to the presence of external fields in unscreened this area. Electric heater b is turned off, and the device enters the joint venture state inside the screen, free from the frozen floor. 1 il.

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The invention relates to technical physics, in particular, to the field of ekanirovaniya devices from magnetic fields.

The purpose of the invention is to increase the efficiency of shielding when the superconducting device is repeatedly moved from an unshielded area to a shielded one.

 The goal is achieved by the fact that at the end of the floor the chamber, shielded by a multi-layer superconducting screen, is provided with a lid tightly connected to its open end, in which the rod is hermetically and movably mounted. A heater is installed on the inner surface of the chamber, at the level of the upper edge of the multilayer screen, 35, and the chamber is filled with coolant gas, and its bottom is made with the possibility of conductive thermal contact with liquid refrigerant .-. 40

The drawing shows the device, the overall appearance.

The device contains a cryostat 1, a hollow chamber 2, the bottom of which is 45 seconds in contact with a liquid refrigerant, and the walls are vacuum-insulated, the clamp 3, hermetically connected to the open entrance of the chamber 2, the stem 4, fortified in the crest 3 by its own the end is hermetically and movably, the inlet 5 mounted on the lid 3, to let the gaseous coolant flow into the chamber 2, the electric heater 6 fixed on the inner surface of the chamber 2 at the edge level of the multilayer screen 7 made of superconducting material immersed in the cryostat liquid refrigerant one.

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five

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five

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The device works as follows.

The cryostat 1 is filled with liquid spine agent. Chamber 2 is sealed with Kryshka 3. In this case, the device containing superconducting material, previously attached to the free end of the rod 4, is placed in the volume of chamber 2. Through the inlet 5, the chambers are filled with a gaseous heat carrier, such as helium. The electric heater 6 is turned on.

The rod 4 is moved inside the chamber, while the superconducting device ,. hardened on its End, goes into the area shielded by the multilayer superconducting screen at a temperature higher than that at which the superconductivity occurs and the device does not excite undamped currents due to magnetic fields existing in the unshielded area of chamber 2. Electric heater 6 is disconnected. In chamber 2 the temperature is determined to correspond to the 1 st superconductivity region of the instrument. Formula 3 and about b e th e n i

A device for screening a superconducting device. Containing 1 a fiostat placed in it. : a multilayer screen of superconducting material immersed in a cryostat refrigerant and a hollow chamber placed inside the screen, open on one side with vacuum-insulated walls, which is filled with a refrigerant in order to increase the efficiency of shielding repeated movement of the device from the unshielded area to the screened, the floor of the camera is provided with a cracker, herme51499409

tally connected to it from its open chamber at the level of placement

that side, the rod, installed the upper edge of the multi-layer e crane,

inside it, one end of which is ger-where the chamber is filled with gas-gas and is movably connected to a different heat carrier, and its bottom is heated, and a heater strengthened with the possibility of thermal equating the inner surface of the walls along with the liquid cryostat refrigerant.

Claims (1)

Claim A device for screening a superconducting device, comprising a cryostat with: a multilayer screen of superconducting material immersed in the refrigerant of the cryostat, and a hollow chamber located inside the screen, open on one side, with vacuum-insulated walls, which is immersed in the refrigerant, different the fact that, in order to increase the shielding efficiency when the device is used repeatedly from the unshielded area to the shielded one, the hollow chamber is equipped with a lid sealed to it with the open side, a rod installed inside it, one end of which is hermetically and movably connected to the cover, and a heater mounted on the inner surface of the walls of the hollow chamber at the level of placement of the upper edge of the multilayer screen, the hollow chamber being filled with gaseous coolant, and its bottom is made with the possibility of thermal contact with the liquid refrigerant of the cryostat.