Efficient and Cost Effective Small 2 K Systems for Laboratory Use

Peter Knudsen, FRIB
Thursday, Oct 05, 12:30 PM - Special ASD Seminar
1200 FRIB Laboratory

Abstract:  There is a need for small 1.8 K to 2.1 K refrigeration systems for SRF systems and component testing in the laboratories, which can provide 50 to 100 W, that are cost effective, efficient, and relatively easy to implement. This capacity and temperature range is not practically or efficiently handled by cryo-coolers. These are very energy intensive applications and it is not uncommon for these small systems to require up to 7000 Watts per 1 Watt of cooling at 2 K, which is approximately an order of magnitude higher input power for the same cooling capacity as compared to large systems. For these small (capacity) systems, a very modest additional capital investment can substantially improve the performance to less than 2000 Watts per Watt, and these can be packaged to work with a standard commercial 4.5 K liquefier. This talk will discuss possible design options and the projected performance for these small systems.