Frank Laboratory of Neutron Physics

DSC Seminar

Date and Time: Thursday, 14 November 2019, at 11:00 AM

Venue: Department of Spectrometers’ Complex, Conference hall, bld. 119, Frank Laboratory of Neutron Physics

Seminar topic: «³Не/⁴He refrigerator based on closed cycle cryocooler»

Authors: A. Chernikov, A. Buzdavin, F. Cherviakov

Speaker: A. Chernikov

Abstract:

The ³Не/⁴He refrigerator based on the 150 mm shaft cryostat and the closed cycle cryocooler GM SRDK415D (Sumitomo) is described. In a single mode, the final temperature of the ³He refrigerator was 0.52 K. In a continuous mode with ³He, the final temperature was 0.78 K. Using ³He without external pumping a retained mode of temperature is achieved in the range of (1.0 – 1.5) K with positive drift +(10-15) mK/h for 11 days.

In the ⁴He liquefaction mode at a temperature of 4.2 К, a cooling efficiency of 1.6 W was obtained. In the continuous mode with the liquid ⁴Не vapor pumping the final temperature was 1.4 К.

Both of the helium isotopes were pumped out by the oil-free spiral pump XDS35i.