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Thermal architecture for the SPIDER flight cryostat

Society of Photo-Optical Instrumentation Engineers (SPIE)

We describe the cryogenic system for SPIDER, a balloon-borne microwave polarimeter that will map 8% of the sky with degree-scale angular resolution. The system consists of a 1284 L liquid helium cryostat and a 16 L capillary-filled superfluid helium tank, which provide base operating temperatures of 4 K and 1.5 K, respectively. Closed-cycle 3He adsorption refrigerators supply sub-Kelvin cooling power to multiple focal planes, which are housed in monochromatic telescope inserts. The main helium tank is suspended inside the vacuum vessel with thermally insulating fiberglass flexures, and shielded from thermal radiation by a combination of two vapor cooled shields and multi-layer insulation. This system allows for an extremely low instrumental background and a hold time in excess of 25 days. The total mass of the cryogenic system, including cryogens, is approximately 1000 kg. This enables conventional long duration balloon flights. We will discuss the design, thermal analysis, and qualification of the cryogenic system Copyright 2010 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Text

2011-09-12

Attribution-NonCommercial-NoDerivatives 4.0 International

http://hdl.handle.net/2429/37245

Gudmundsson, Jon E.; Ade, Peter A. R.; Amiri, Mandana; Benton, Steven J.; Bihary, Richard; Bock, James J.; Bond, J. Richard; Bonetti, Joseph A.; Bryan, Sean A.; Burger, Bryce; Chiang, H. Cynthia; Contaldi, Carlo R.; Crill, Brendan P.; Dore, Olivier; Farhang, Marzieh; Filippini, Jeffrey P.; Fissel, Laura M.; Gandilo, Natalie N.; Golwala, Sunil R.; Halpern, Mark; Hasselfield, Matthew; Hilton, Gene C.; Holmes, Warren; Hristov, Viktor V.; Irwin, Kent D.; Jones, William C; Kuo, Chao Lin; MacTavish, Carrie J.; Mason, Peter V.; Montory, Thomas E.; Morford, Tracy A.; Netterfield, C. Barth; O'Dea, Daniel T.; Rahlin, Alexandra S.; Reintsema, Carl D.; Ruhl, John E.; Runyan, Marcus C.; Schenker, Matthew A.; Shariff, Jamil A.; Soler, Juan Diego; Trangsrud, Amy R.; Tucker, Carole E.; Tucker, Rebecca S.; Turner, Anthony D. Thermal architecture for the SPIDER flight cryostat. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, edited by Holland, Wayne S.; Jonas Zmuidzinas, Proceedings of SPIE Volume 7741, 77411M, 2010.

Reviewed

Halpern, Mark

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