LIQUID-HELIUM VIBRATION CRYOSTAT FOR SPACE QUALIFICATION TESTS

A continuous flow, liquid helium cooled vibration cryostat with a useful cold space of 200 mm diameter and 160 mm height is described. The cryostat (weight 9 kg) is attached to the armature of a vibration magnet. Cool-down to 4.2 K takes ∼ 15 min and warm-up ∼ 1 h. The vacuum jacket and radiation shields can be removed so that samples can easily be exchanged. The vibration transfer of the cryostat is quite flat up to 600 Hz. The performance of the cryostat has been verified up to a level of 25 g (r.m.s.) in the random mode and up to 30 g (0-p) in the sinusoidal mode. A number of infrared filters and polarizers for the ISOPHOT experiment, an active phase separator and certain cryomotors have already been successfully tested. © 1990.