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Proceedings Paper

Large-area cryocooling for far-infrared telescopes
Author(s): Triem T. Hoang; Tamara A. O'Connell; Jentung Ku; C. Dan Butler; Theodore D. Swanson
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Paper Abstract

Requirements for cryocooling of large-area heat sources begin to appear in studies of future space missions. Examples are the cooling of (i) the entire structure/mirror of large Far Infrared space telescopes to 4-40K and (ii) cryogenic thermal bus to maintain High Temperature Superconductor electronics to below 75K. The cryocooling system must provide robust/reliable operation and not cause significant vibration to the optical components. But perhaps the most challenging aspect of the system design is the removal of waste heat over a very large area. A cryogenic Loop Heat Pipe (C-LHP)/ cryocooler cooling system was developed with the ultimate goal of meeting the aforementioned requirements. In the proposed cooling concept, the C-LHP collected waste heat from a large-area heat source and then transported it to the cryocooler coldfinger for rejection. A proof-of-concept C-LHP test loop was constructed and performance tested in a vacuum chamber to demonstrate the feasibility of the proposed C-LHP to distribute the cryocooler cooling power over a large area. The test loop was designed to operate with any cryogenic working fluid such as Oxygen/Nitrogen (60-120K), Neon (28-40K), Hydrogen (18-30K), and Helium (2.5-4.5K). Preliminary test results indicated that the test loop had a cooling capacity of 4.2W in the 30-40K temperature range with Neon as the working fluid.

Paper Details

Date Published: 15 October 2003
PDF: 9 pages
Proc. SPIE 5172, Cryogenic Optical Systems and Instruments X, (15 October 2003); doi: 10.1117/12.508569
Show Author Affiliations
Triem T. Hoang, TTH Research, Inc. (United States)
Tamara A. O'Connell, TTH Research, Inc. (United States)
Jentung Ku, NASA Goddard Space Flight Ctr. (United States)
C. Dan Butler, NASA Goddard Space Flight Ctr. (United States)
Theodore D. Swanson, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 5172:
Cryogenic Optical Systems and Instruments X
James B. Heaney; Lawrence G. Burriesci, Editor(s)

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