1. Cryocooled cold trap system for the SuperCDMS dilution refrigerator
- Author
-
M. Ruschman, G. Tatkowski, P. Lukens, M. I. Hollister, D. A. Bauer, and R. Dhuley
- Subjects
Condensed Matter::Quantum Gases ,Thesaurus (information retrieval) ,Materials science ,Physics::Instrumentation and Detectors ,Nuclear engineering ,Astrophysics::Instrumentation and Methods for Astrophysics ,Physics::Atomic Physics ,Dilution refrigerator ,Cold trap - Abstract
Operating 6,800 feet underground at the SNOLAB facility in Sudbury, Ontario, Canada, the dilution refrigerator-cooled SuperCDMS SNOLAB (Super Cryogenic Dark Matter Search at the Sudbury Neutrino Observatory Laboratory) experiment has been designed for maximum cryogenic up-time and remote operations. A key element in achieving these goals is a pair cold traps in the helium circulation stream of the dilution refrigerator; the first operating near liquid nitrogen temperatures and the second operating near liquid helium temperatures. Previous experience with the CDMS experiment, located underground at the Soudan Under-ground Laboratory, has given significant operational experience with dilution refrigerator cold traps and has solidified the demand of a system of dual cold traps. Unlike the CDMS-era system, the new SuperCDMS system will feature a cryocooler powered liquid nitrogen re-liquefying system (as opposed to regular under-ground re-filling of cold trap dewars using portable nitrogen dewars) and a cryogen-free 4 K cold trap, which eliminates the need for a bath of liquid helium.
- Published
- 2020