Abstract
In the previous paper, a performance of the 3He refrigerator with a Joule-Thomson expansion system under the steady heat load was reported. In this paper, the analysis and the behavior of the system after a pulsed heat generation in the pressurized He II are presented. Following the rise in temperature of the presurized He II upto near the λ point, the system is restored to a initial condition within a 15min. In the course of restoration, the temperature at the J-T valve showed an apparent unusual behavior. Very similar one was also seen during the initial cooling from 4.2K to 1.8K. These behaviors are analized on the basis of transient mass flow change.
