Design and development of an ambient-temperature continuously-rotating achromatic half-wave plate for CMB polarization modulation on the POLARBEAR-2 experiment

被引：31

作者：

Hill, Charles A. ^{[1
,2
]}

Beckman, Shawn ^{[1
]}

Chinone, Yuji ^{[1
,3
]}

Goeckner-Wald, Neil ^{[1
]}

Hazumi, Masashi ^{[3
,4
,5
,6
]}

Keating, Brian ^{[7
]}

Kusaka, Akito ^{[2
]}

Lee, Adrian T. ^{[1
,2
,8
]}

Matsuda, Frederick ^{[7
]}

Plambeck, Richard ^{[8
]}

Suzuki, Aritoki ^{[1
,8
]}

Takakura, Satoru ^{[4
,9
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Phys, Berkeley, CA 94720 USA

[3] Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan

[4] High Energy Accelerator Res Org KEK, IPNS, Tsukuba, Ibaraki 3050801, Japan

[5] SOKENDAI Grad Univ Adv Studies, Hayama, Kanagawa 2400193, Japan

[6] Japan Aerosp Explorat Agcy JAXA, ISAS, Sagamihara, Kanagawa 2525210, Japan

[7] Univ Calif San Diego, Dept Phys, San Diego, CA 92093 USA

[8] Univ Calif Berkeley, Radio Astron Lab, Berkeley, CA 94720 USA

[9] Osaka Univ, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

来源：

MILLIMETER, SUBMILLIMETER, AND FAR-INFRARED DETECTORS AND INSTRUMENTATION FOR ASTRONOMY VIII | 2016年 / 9914卷

关键词：

Half-wave plate; sapphire; POLARBEAR-2; PB2; Simons Array; polarization; modulation; rotation; inflation; B-mode; INFLATIONARY UNIVERSE; GRAVITY-WAVES; MICROWAVE; FLATNESS; HORIZON;

D O I：

10.1117/12.2232280

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to 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.

引用

页数：18

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