Temperature control for liquid‐helium cryostats below 4.2 K

摘要: We report the operational characteristics of a membrane type manostat and throttle valve system which we have constructed to regulate pressure P above liquid‐helium bath. The choice rather than other device depends on nature experiments be performed: in manostat, temperature is determined with an accuracy limited by fluctuations ΔT around mean value T. With valves, drift T time. performance both devices prove sufficiently good as they stand, since departure from course lower 10−2 K whole range 1.4