Switch for fine adjustment of persistent current loops in...

Details Switch for fine adjustment of persistent current loops in... Switch for fine adjustment of persistent current loops in...

H - Electricity

01

L

324/1, 317/26.1

H01L 39/16 (2006.01) H01F 6/00 (2006.01) H01L 39/10 (2006.01)

Patent

CA 1257642

SWITCH FOR FINE ADJUSTMENT OF PERSISTENT CURRENT LOOPS IN SUPERCONDUCTIVE CIRCUITS Abstract of the Disclosure A small portion of a lead for a superconducting coil is made to function as a controllable resistor with a low resistance value and fast thermal response so as to be capable of rapidly being switched between the superconduct- ing and resistive states. The device is thus capable of fine adjustment of the current flowing in a superconducting loop. The switch includes lengths of parallel conductor so that the resulting section of superconductive material is cryostable. The superconducting coil lead is disposed on a substrate so as to permit ready access for helium or other cryogenic coolant to most lead surfaces. The small mass and close contact with the coolant produce rapid turn-on and turn-off response characteristics. Furthermore, the low overall resistance causes the coil current to decay slowly, thus preventing precise control of the superconducting current.

466394

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