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Proceedings Paper

Design and development of an ambient-temperature continuously-rotating achromatic half-wave plate for CMB polarization modulation on the POLARBEAR-2 experiment
Author(s): Charles A. Hill; Shawn Beckman; Yuji Chinone; Neil Goeckner-Wald; Masashi Hazumi; Brian Keating; Akito Kusaka; Adrian T. Lee; Frederick Matsuda; Richard Plambeck; Aritoki Suzuki; Satoru Takakura
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Paper Abstract

We describe the development of an ambient-temperature continuously-rotating half-wave plate (HWP) for study of the Cosmic Microwave Background (CMB) polarization by the POLARBEAR-2 (PB2) experiment. Rapid polarization modulation suppresses 1/f noise due to unpolarized atmospheric turbulence and improves sensitivity to degree-angular-scale CMB fluctuations where the inflationary gravitational wave signal is thought to exist. A HWP modulator rotates the input polarization signal and therefore allows a single polarimeter to measure both linear polarization states, eliminating systematic errors associated with differencing of orthogonal detectors. PB2 projects a 365-mm-diameter focal plane of 7,588 dichroic, 95/150 GHz transition-edge-sensor bolometers onto a 4-degree field of view that scans the sky at ~ 1 degree per second. We find that a 500-mm-diameter ambient-temperature sapphire achromatic HWP rotating at 2 Hz is a suitable polarization modulator for PB2. We present the design considerations for the PB2 HWP, the construction of the HWP optical stack and rotation mechanism, and the performance of the fully-assembled HWP instrument. We conclude with a discussion of HWP polarization modulation for future Simons Array receivers.

Paper Details

Date Published: 19 July 2016
PDF: 18 pages
Proc. SPIE 9914, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII, 99142U (19 July 2016); doi: 10.1117/12.2232280
Show Author Affiliations
Charles A. Hill, Univ. of California, Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
Shawn Beckman, Univ. of California, Berkeley (United States)
Yuji Chinone, Univ. of California, Berkeley (United States)
Kavli Institute for The Physics and Mathematics of The Universe, The Univ. of Tokyo (Japan)
Neil Goeckner-Wald, Univ. of California, Berkeley (United States)
Masashi Hazumi, Kavli Institute for The Physics and Mathematics of The Universe, The Univ. of Tokyo (Japan)
High Energy Accelerator Research Organization, KEK (Japan)
The Graduate Univ. for Advanced Studies and Japan Aerospace Exploration Agency (Japan)
Brian Keating, Univ. of California, San Diego (United States)
Akito Kusaka, Lawrence Berkeley National Lab. (United States)
Adrian T. Lee, Univ. of California, Berkeley (United States)
Lawrence Berkeley National Lab. (United States)
Frederick Matsuda, Univ. of California, San Diego (United States)
Richard Plambeck, Univ. of California, Berkeley (United States)
Aritoki Suzuki, Univ. of California, Berkeley (United States)
Satoru Takakura, High Energy Accelerator Research Organization, KEK (Japan)
Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 9914:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Wayne S. Holland; Jonas Zmuidzinas, Editor(s)

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