Selective excitation of coils comprising a superconducting magne

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

1978-02-21

1979-11-06

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including superconductivity

324320, H01H 4700

Patent

active

041737750

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 consequence, the dimensions of the vent and fill tube openings of the cryostat which accommodate these conductors may be reduced. In one embodiment a diode is incorporated in series with heating element of each switch. The switches are connected to form a steering network to control as many as p.ltoreq.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.ltoreq.2.sup.n -1 persistence switches.

REFERENCES:
patent: 3412320 (1968-11-01), Marshall
patent: 3419794 (1968-12-01), Weaver, Jr. et al.
patent: 3419904 (1968-12-01), Weaver et al.
patent: 3549952 (1970-12-01), Sole
patent: 3826972 (1974-07-01), Day et al.
patent: 4084209 (1978-04-01), Hilal

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