MMA Memo #266

Joule-Thompson Cryocooler Stage for SIS Mixers: Strawman Designs

L. D'Addario [1]

May 19, 1999

Keywords: cryogenics, SIS Mixers, Receivers, cryocoolers, Joule-Thompson

Presented here are outlines of two designs for cryocoolers that might be used with the MMA/ALMA SIS mixer receivers. We concentrate mainly on the last stage of cooling, which in both cases is a Joule-Thompson expander. The first case is the current, preliminary design (further discussed in [1]), intended to provide 0.7 W of cooling at 4.0K at the mixer mounting plate. The second is intended to provide 0.7 W of cooling at 2.5K. For comparison, some data is also presented on the 4K, 1.5 W coolers now used at the NRAO 12m telescope and elsewhere.

[1] NRAO-TUC

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Last modified: 1999-dec-09