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A cryogenic half-wave plate polarimeter using a superconducting magnetic bearing

Klein, Jeff, Aboobaker, Asad, Ade, Peter A. R., Aubin, Francois, Baccigalupi, Carlo, Bao, Chaoyun, Borrill, Julian, Chapman, Daniel, Didier, Joy, Dobbs, Matt, Gold, Benjamin, Grainger, William F., Hanany, Shaul, Hubmayr, Johannes, Hillbrand, Seth, Grain, Julien, Jaffe, Andrew, Johnson, Bradley, Jones, Terry, Kisner, Theodore, Korotkov, Andrei, Leach, Sam, Lee, Adrian, Levinson, Lorne, Limon, Michele, MacDermid, Kevin, Matsumura, Tomotake, Miller, Amber, Milligan, Michael, Pascale, Enzo, Polsgrove, Daniel, Ponthieu, Nicolas, Raach, Kate, Reichborn-Kjennerud, Britt, Sagiv, Ilan, Stompor, Radek, Tran, Huan, Tristram, Matthieu, Tucker, Gregory S., Yadav, Amit, Zaldarriaga, Matias and Zilic, Kyle 2011. A cryogenic half-wave plate polarimeter using a superconducting magnetic bearing. Presented at: Cryogenic Optical Systems and Instruments XIII, San Diego, CA, USA, 24-25 August 2011. Cryogenic Optical Systems and Instruments XIII. SPIE Proceedings International Society for Optical Engineering, p. 815004. 10.1117/12.893669

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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.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Additional Information: Cryogenic optical systems and instruments XIII [i.e. XIV]
Publisher: International Society for Optical Engineering
ISBN: 9780819487605
Last Modified: 04 Jun 2017 04:12

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