Passive conductor heater for zero boiloff superconducting magnet pressure control

摘要

A passive non-electric pressure control system for superconducting magnet cryogen vessel (12) to maintain internal pressure above the outside pressure to avoid cryopumping utilizes a passive thermal conductor (21) extending from the outside atmosphere into the vessel. The selective amount of penetration of the shaft (16) of the thermal conductor into the cryogen vessel, which can be varied by means of a threaded adjustment mechanism (5 8, 59, 60, 61), controls the amount of heat transferred to the interior of the vessel and thus controls the internal pressure of the vessel.