Superconducting magnet apparatus with an emergency run-down syst

Details Superconducting magnet apparatus with an emergency run-down syst Superconducting magnet apparatus with an emergency run-down syst

1990-06-13

1991-02-19

Pellinen, A. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including superconductivity

361 19, 505 1, 505850, H02H 900

Patent

active

049949357

ABSTRACT:
A superconducting magnet apparatus comprising a superconducting main coil (1) for generating a uniform magnetic field and at least one superconducting shim coil (2a, 2b) electromagnetically coupled to the superconducting main coil (1) for increasing the uniformity of the magnetic field generated by the main coil (1). An emergency run down main coil heater element (21) is disposed adjacent to the main coil (1) for demagnetizing the latter, an emergency run down shim coil heater element (22a, 22b) is disposed in proximity of the shim coil (22a, 22b) for demagnetizing the latter, and a heater power source (24) is provided for supplying an electrical power to the heater elements (21,22a,22b). A switching unit (25,26,27) is connected between the heater elements (21,22a, 22b) and the heater power source (24) for connecting the heater power source (24) to the shim coil heater element (22a, 22b) and to the main coil heater element ( 21) at different time points with a predetermined time interval therebetween. The predetermined time interval may be selected such that the superconducting main coil (1) revert to a normal state after the superconducting shim coil (2a, 2b) has reverted to a normal state. The switching unit may include a first switch for selectively energizing the main coil heater element (21) and a second switch for selectively energizing the shim coil heater elements (22a, 22b) and a control unit for actuating the first and second switches at the different time points.

REFERENCES:
patent: 4559576 (1985-12-01), Ries
patent: 4807084 (1989-02-01), Takechi

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