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Proceedings Paper

A polarimetry module for CSO/SHARC-II
Author(s): Giles Novak; David T. Chuss; Jacqueline A. Davidson; Jessie L. Dotson; Charles Darren Dowell; Roger H. Hildebrand; Martin Houde; Larry Kirby; Megan Krejny; Alex Lazarian; Hua-bai Li; S. Harvey Moseley; John E. Vaillancourt; Farhad Yusef-Zadeh
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Paper Abstract

The Submillimeter High Angular Resolution Camera II (SHARC-II) is a 32 x 12 pixel submillimeter camera that is used with the ten-meter diameter Caltech Submillimeter Observatory (CSO) on Mauna Kea. SHARC-II can be operated at either 350 or 450 microns. We are developing an optics module that we will install at a position between the SHARC-II camera and the focus of the CSO's secondary mirror. With our module installed, SHARC-II will be converted into a sensitive imaging polarimeter. The basic idea is that the module will split the incident beam coming from the secondary into two orthogonally polarized beams which are then re-imaged onto opposite ends of the “long and skinny” SHARC-II bolometer array. When this removable polarimetry module is in use, SHARC-II becomes a dual-polarization 12 x 12 pixel polarimeter. (The central 12 x 8 pixels of the SHARC-II array will remain unused.) Sky noise is a significant source of error for submillimeter continuum observations. Because our polarimetry module will allow simultaneous observation of two orthogonal polarization components, we will be able to eliminate or greatly reduce this source of error. Our optical design will include a rotating half-wave plate as well as a cold load to terminate the unused polarization components.

Paper Details

Date Published: 8 October 2004
PDF: 12 pages
Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.553076
Show Author Affiliations
Giles Novak, Northwestern Univ. (United States)
David T. Chuss, NASA Goddard Space Flight Ctr. (United States)
Jacqueline A. Davidson, NASA Ames Research Ctr. (United States)
Jessie L. Dotson, NASA Ames Research Ctr. (United States)
Charles Darren Dowell, Jet Propulsion Lab. (United States)
California Institute of Technology (United States)
Roger H. Hildebrand, Univ. of Chicago (United States)
Martin Houde, Univ. of Western Ontario (Canada)
Larry Kirby, Univ. of Chicago (United States)
Megan Krejny, Northwestern Univ. (United States)
Alex Lazarian, Univ. of Wisconsin (United States)
Hua-bai Li, Northwestern Univ. (United States)
S. Harvey Moseley, NASA Goddard Space Flight Ctr. (United States)
John E. Vaillancourt, Univ. of Chicago (United States)
Farhad Yusef-Zadeh, Northwestern Univ. (United States)

Published in SPIE Proceedings Vol. 5498:
Millimeter and Submillimeter Detectors for Astronomy II
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington, Editor(s)

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