Superconducting magnet apparatus with cryogen vessel

摘要

In a superconducting magnet apparatus, at least one superconducting winding and an outer vacuum chamber are provided. A thermal radiation shield is located between the superconducting winding and the outer vacuum chamber. A cryogen vessel is positioned within the thermal radiation shield and within the outer vacuum chamber. The superconducting winding is positioned outside of the cryogen vessel. A refrigerator is operable to cool the cryogen vessel to a liquid cryogen temperature and 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. A substantial portion of an outer surface of the cryogen vessel has a thermal emissivity at the liquid cryogen temperature which is greater than an average surface emissivity of the superconducting winding by at least 0.1.

主权项

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.