The Cryogenics group is working on the cryogenic system for the Reuven Ramaty High Energy Solar Specrtroscopic Imager (RHESSI) satellite. The cooling will be provided by an M77 Cryocooler, built by Sunpower.
For more information on HESSI, see:
Mark O. Kimball
NASA Official: Eric A. Silk
Last Updated: 09/11/2014