Patent ID: 9165704
Filing Date: 2015-10-20
Classification: F17C,G01R,H01F

Abstract:
1. A superconducting magnet apparatus, comprising: at least one superconducting winding; an outer vacuum chamber housing the at least one superconducting winding; at least one thermal radiation shield located between the at least one superconducting winding and the outer vacuum chamber; a cryogen vessel positioned within the at least one thermal radiation shield and within the outer vacuum chamber, the at least one superconducting winding being positioned outside of the cryogen vessel; at least one refrigerator operable to cool the cryogen vessel to a liquid cryogen temperature and arranged to cool the at least one thermal radiation shield to an intermediate temperature between the liquid cryogen temperature and a temperature of the outer vacuum chamber; and a substantial portion of an outer surface of the cryogen vessel having a thermal emissivity at the liquid cryogen temperature which is greater than an average surface emissivity of the at least one superconducting winding by at least 0.1.