| 摘要 |
PROBLEM TO BE SOLVED: To stabilize an excitation operation of a conductive cooling superconducting magnet by a method, wherein the construction is made so that an amplitude of a power source ripple from an exciting power source is satisfied with a specific formula. SOLUTION: In a superconducting magnet device 1, when a cooling stage temperature of a refrigerating machine coming into thermal contact with a superconducting magnet 3 is set at Tcr, and a formula for AC loss with respect to a current amplitude Im of an exciting power source 5 to fn(Im), a volume occupied by a superconducting wire rod of a coil winding 2 to v, the length of a heat transmitting conductor which coupling the superconducting magnet 3 with the second stage of the refrigerating machine to d, an amplitude of AC flowing in the coil winding 2 of the superconducting magnet 3 to Im, heat transfer coefficient from the superconducting magnet 3 to the cooling stage of the refrigerating machine isκ, and the critical temperature of a superconductive wire rod when a magnetic field B occurs to Tc(B), the inductance of the superconductive magnet 3 to L, and a power source ripple from the exciting power source 5 to A, and the frequency of the power source ripple toω, constitution is made so as to restrict heat generation due to an AC loss attributed to the power source ripples (amplitude Im), and satisfy formula I with superior heat transfer. |
