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Proceedings Paper

A cryogenic half-wave plate polarimeter using a superconducting magnetic bearing
Author(s): Jeff Klein; Asad Aboobaker; Peter Ade; François Aubin; Carlo Baccigalupi; Chaoyun Bao; Julian Borrill; Daniel Chapman; Joy Didier; Matt Dobbs; Benjamin Gold; Will Grainger; Shaul Hanany; Johannes Hubmayr; Seth Hillbrand; Julien Grain; Andrew Jaffe; Bradley Johnson; Terry Jones; Theodore Kisner; Andrei Korotkov; Sam Leach; Adrian Lee; Lorne Levinson; Michele Limon; Kevin MacDermid; Tomotake Matsumura; Amber Miller; Michael Milligan; Enzo Pascale; Daniel Polsgrove; Nicolas Ponthieu; Kate Raach; Britt Reichborn-Kjennerud; Ilan Sagiv; Radek Stompor; Huan Tran; Matthieu Tristram; Gregory S. Tucker; Amit Yadav; Matias Zaldarriaga; Kyle Zilic
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Paper Abstract

We present the design and measured performance of the superconducting magnetic bearing (SMB) that was used successfully as the rotation mechanism in the half-wave plate polarimeter of the E and B Experiment (EBEX) during its North American test flight. EBEX is a NASA-supported balloon-borne experiment that is designed to measure the polarization of the cosmic microwave background. In this implementation the half-wave plate is mounted to the rotor of an SMB that is operating at the sink temperature of 4 K. We demonstrate robust, remote operation on a balloon-borne payload, with angular encoding accuracy of 0.01°. We find rotational speed variation to be 0.2% RMS. We measure vibrational modes and find them to be consistent with a simple SMB model. We search for but do not find magnetic field interference in the detectors and readout. We set an upper limit of 3% of the receiver noise level after 5 minutes of integration on such interference. At 2 Hz rotation we measure a power dissipation of 56 mW. If this power dissipation is reduced, such an SMB implementation is a candidate for low-noise space applications because of the absence of stick-slip friction and low wear.

Paper Details

Date Published: 28 September 2011
PDF: 10 pages
Proc. SPIE 8150, Cryogenic Optical Systems and Instruments XIII, 815004 (28 September 2011); doi: 10.1117/12.893669
Show Author Affiliations
Jeff Klein, Univ. of Minnesota (United States)
Asad Aboobaker, Univ. of Minnesota (United States)
Peter Ade, Cardiff Univ. (United Kingdom)
François Aubin, McGill Univ. (Canada)
Carlo Baccigalupi, Scuola Internazionale Superiore di Studi Avanzati (Italy)
Chaoyun Bao, Univ. of Minnesota (United States)
Julian Borrill, Lawrence Berkeley National Lab. (United States)
Daniel Chapman, Columbia Univ. (United States)
Joy Didier, Columbia Univ. (United States)
Matt Dobbs, McGill Univ. (Canada)
Benjamin Gold, Univ. of Minnesota (United States)
Will Grainger, Cardiff Univ. (United Kingdom)
Shaul Hanany, Univ. of Minnesota (United States)
Johannes Hubmayr, National Institute of Standards and Technology (United States)
Seth Hillbrand, Columbia Univ. (United States)
Julien Grain, Institut d'Astrophysique Spatiale, Univ. Paris-Sud (France)
Andrew Jaffe, Imperial College London (United Kingdom)
Bradley Johnson, Columbia Univ. (United States)
Terry Jones, Univ. of Minnesota (United States)
Theodore Kisner, Lawrence Berkeley National Lab. (United States)
Andrei Korotkov, Brown Univ. (United States)
Sam Leach, Scuola Internazionale Superiore di Studi Avanzati (Italy)
Adrian Lee, Lawrence Berkeley National Lab. (United States)
Lorne Levinson, Weizmann Institute of Science (Israel)
Michele Limon, Columbia Univ. (United States)
Kevin MacDermid, McGill Univ. (Canada)
Tomotake Matsumura, High Energy Accelerator Research Organization, KEK (Japan)
Amber Miller, Columbia Univ. (United States)
Michael Milligan, Univ. of Minnesota (United States)
Enzo Pascale, Cardiff Univ. (United Kingdom)
Daniel Polsgrove, Univ. of Minnesota (United States)
Nicolas Ponthieu, Institut d'Astrophysique Spatiale, Univ. Paris-Sud (France)
Kate Raach, Univ. of Minnesota (United States)
Britt Reichborn-Kjennerud, Columbia Univ. (United States)
Ilan Sagiv, Univ. of Minnesota (United States)
Radek Stompor, Lab. AstroParticule et Cosmologie, CNRS, Univ. Paris-Diderot (France)
Huan Tran, Univ. of California, Berkeley (United States)
Matthieu Tristram, Lab. de l'Accélérateur Linarie, CNRS, Univ. Paris-Sud (France)
Gregory S. Tucker, Brown Univ. (United States)
Amit Yadav, Institute for Advanced Study (United States)
Matias Zaldarriaga, Institute for Advanced Study (United States)
Kyle Zilic, Univ. of Minnesota (United States)

Published in SPIE Proceedings Vol. 8150:
Cryogenic Optical Systems and Instruments XIII
James B. Heaney; E. Todd Kvamme, Editor(s)

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