Cryostat design and fabrication for the Gemini NIRI instrument

Details Cryostat design and fabrication for the Gemini NIRI instrument Cryostat design and fabrication for the Gemini NIRI instrument

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3354.1084y&link_type=abstract

Proc. SPIE Vol. 3354, p. 1084-1091, Infrared Astronomical Instrumentation, Albert M. Fowler; Ed.

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Scientific paper

The Gemini Near IR Imager (NIRI) is a cryogenic instrument cooled by two closed-cycle cryo-coolers. The vacuum jacket is a hexagon shaped vacuum vessel made of three sections. Each section is forged out of aluminum 6061. All the internal structural components are made of aluminum 6061T6 except the supporting trusses, which are made of titanium. All the internal structural members are stress relieved to maintain dimensional stability and good optical alignment. The thermal insulation includes floating shields and cold shields. Two closed-cycle coolers are mounted opposite to each other and electronically synchronized in order to cancel the vibration caused by the oscillating expansion valve. Several different fabrication methods and stress relief methods are discussed.

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