Superconducting magnet device
The superconducting magnet device reduces the number of connections within and/or the number of wires leading out of a superconducting coil winding and promptly starts expending the magnetic energy in a superconducting coil operating in a persistent-current mode when the superconducting coil increases in temperature or transitions to normal conductivity. This invention provides a superconducting magnet device that has the following: a superconducting coil connected to an excitation power supply; a persistent-current switch connected to the superconducting coil; a heater that controls the temperature of the persistent-current switch; a current source that is connected in parallel with the persistent-current switch and has a different polarity from the excitation power supply; a driving circuit connected to the heater and the current source; and a signal-inputting means for inputting a signal to the driving circuit. The driving circuit operates the heater and the current source when the signal is inputted thereto.
1. A superconducting magnet device, comprising:
a superconducting coil connected to a power supply for excitation;
a persistent current switch connected to the superconducting coil;
a heater configured to control a temperature of the persistent current switch;
a current source connected in parallel to the persistent current switch and having a polarity different from that of the power supply for excitation;
a driving circuit connected to the heater and the current source; and
signal inputting means for inputting a signal to the driving circuit; wherein
the driving circuit renders the heater and the current source operative when the signal is inputted thereto.
2. The superconducting magnet device according to claim 1 , further comprising:
a good conductor contacting with the superconducting coil; and
a refrigerator connected to the good conductor.
3. The superconducting magnet device according to claim 1 , further comprising:
abnormality detection means disposed for the superconducting coil; wherein
the abnormality detection means is connected to the signal inputting means.
4. The superconducting magnet device according to claim 2 , further comprising:
a driving mechanism provided at part or the entirety of the good conductor connected to the refrigerator; wherein
the good conductor and the refrigerator are separable from each other.
5. The superconducting magnet device according to claim 1 , wherein
the superconducting coil or the persistent current switch is cooled by coolant.
6. The superconducting magnet device according to claim 5 , further comprising:
a measuring element configured to measure a coolant amount of the coolant.