Selective excitation of coils comprising a superconducting...

Details Selective excitation of coils comprising a superconducting... Selective excitation of coils comprising a superconducting...

G - Physics

01

R

324/1, 317/26.1

G01R 33/3815 (2006.01) H01F 6/00 (2006.01)

Patent

CA 1148613

ABSTRACT Thermal isolation of a cryostat is improved for a superconducting solenoid having a plurality of separately energizable coils or winding sections by reducing the number of conductors required to selectively energize the persistence switch controlling a particular winding section. As a con- sequence, the dimensions of the vent and fill tube openings of the cryostat which accomodate these conductors may be reduced. In one embodiment a diode is incorporated in series with heating element of each switch. The switches are connected ?o form a steering network to control as many as p?n(n-1) separate coils using n conductors to actuate p persistence switches. In another embodiment n(n-1)/2 coils are similarly controlled with n conductors using the time-current response of persistence switches without diodes. Still another embodiment utilizes a binary to hexadecimal converter within the cryostat to permit n externally generated signal conductor to select as many as p ? 2? -1 persistence switches.

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