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Superconducting Stray Field Shield

IP.com Disclosure Number: IPCOM000097215D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Meyers, NH: AUTHOR

Abstract

Stray A. C. and D. C. magnetic fields are eliminated from the vicinity of a superconductive circuit installation. This is effected by lining the inner walls of the liquid helium container with a hard superconducting material.

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Superconducting Stray Field Shield

Stray A. C. and D. C. magnetic fields are eliminated from the vicinity of a superconductive circuit installation. This is effected by lining the inner walls of the liquid helium container with a hard superconducting material.

The liquid helium glass dewar is provided with an inner continuous niobium lining which extends an appreciable distance above the level of the liquid helium. Because niobium has a transition temperature well above the temperature of liquid helium, and also because the thermal conductivity of niobium is much greater than glass, the niobium lining remains superconducting throughout region
A. The extent of region A is increased by providing a further lining of a good thermal conductor, such as copper, in contact with the superconducting niobium lining.

Region A is of importance in that it provides a field free temperature range. Here, the superconductive circuit undergoes the transition between the superconducting and normal resistive state. In this manner, the possibility of inadvertently storing trapped flux is eliminated. Thus, the circuit can be repeatedly removed and reinserted into the liquid helium bath, as well as maintained therein, without any effects from external A. C. or D. C. magnetic fields.

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