Gemini helium closed cycle cooling system
2008
The Gemini Observatory presents the Helium Closed Cycle Cooling System that provides cooling capacity at cryogenic
temperatures for instruments and detectors. It is implemented by running three independent helium closed cycle cooling
circuits with several banks of compressors in parallel to continuously supply high purity helium gas to cryocoolers
located about 100-120 meters apart. This poster describes how the system has been implemented, the required helium
pressures and gas flow to reach cryogenic temperature, the performance it has achieved, the helium compressors and
cryocoolers in use and the level of vibration the cryocoolers produce in the telescope environment. The poster also
describes the new technology for cryocoolers that Gemini is considering in the development of new instruments.
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