A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment

C. A. Hill; A. Kusaka; P. Barton; B. Bixler; A. G. Droster; M. Flament; S. Ganjam; A. Jadbabaie; O. Jeong; A. T. Lee; A. Madurowicz; F. T. Matsuda; T. Matsumura; A. Rutkowski; Y. Sakurai; D. R. Sponseller; A. Suzuki; R. Tat

doi:10.1007/s10909-018-1980-6

A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment

C. A. Hill, A. Kusaka, P. Barton, B. Bixler, A. G. Droster, M. Flament, S. Ganjam, A. Jadbabaie, O. Jeong, A. T. Lee, A. Madurowicz, F. T. Matsuda, T. Matsumura, A. Rutkowski, Y. Sakurai, D. R. Sponseller, A. Suzuki, R. Tat

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We describe the design of a cryogenic rotation stage (CRS) for use with the cryogenic half-wave plate (CHWP) polarization modulator on the POLARBEAR-2b and POLARBEAR-2c (PB2b/c) cosmic microwave background (CMB) experiments, the second and third installments of the Simons Array. Rapid modulation of the CMB polarization signal using a CHWP suppresses 1/f contamination due to atmospheric turbulence and allows a single polarimeter to measure both polarization states, mitigating systematic effects that arise when differencing orthogonal detectors. To modulate the full detector array while avoiding excess photon loading due to thermal emission, the CHWP must have a clear-aperture diameter of > 450 mm and be cooled to < 100 K. We have designed a 454 mm clear-aperture, < 65 K CRS using a superconducting magnetic bearing driven by a synchronous magnetic motor. We present the specifications for the CRS, its interfacing to the PB2b/c receiver cryostat, its performance in a stand-alone test, and plans for future work.

Original language	English
Pages (from-to)	851-859
Number of pages	9
Journal	Journal of Low Temperature Physics
Volume	193
Issue number	5-6
DOIs	https://doi.org/10.1007/s10909-018-1980-6
Publication status	Published - Dec 1 2018
Externally published	Yes

Keywords

Cosmic microwave background
Cryogenic
Half-wave plate
Modulation
POLARBEAR
Polarization
Superconducting magnetic bearing

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Materials Science(all)
Condensed Matter Physics

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10.1007/s10909-018-1980-6

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Hill, C. A., Kusaka, A., Barton, P., Bixler, B., Droster, A. G., Flament, M., Ganjam, S., Jadbabaie, A., Jeong, O., Lee, A. T., Madurowicz, A., Matsuda, F. T., Matsumura, T., Rutkowski, A., Sakurai, Y., Sponseller, D. R., Suzuki, A., & Tat, R. (2018). A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment. Journal of Low Temperature Physics, 193(5-6), 851-859. https://doi.org/10.1007/s10909-018-1980-6

Hill, CA, Kusaka, A, Barton, P, Bixler, B, Droster, AG, Flament, M, Ganjam, S, Jadbabaie, A, Jeong, O, Lee, AT, Madurowicz, A, Matsuda, FT, Matsumura, T, Rutkowski, A, Sakurai, Y, Sponseller, DR, Suzuki, A & Tat, R 2018, 'A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment', Journal of Low Temperature Physics, vol. 193, no. 5-6, pp. 851-859. https://doi.org/10.1007/s10909-018-1980-6

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title = "A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment",

abstract = "We describe the design of a cryogenic rotation stage (CRS) for use with the cryogenic half-wave plate (CHWP) polarization modulator on the POLARBEAR-2b and POLARBEAR-2c (PB2b/c) cosmic microwave background (CMB) experiments, the second and third installments of the Simons Array. Rapid modulation of the CMB polarization signal using a CHWP suppresses 1/f contamination due to atmospheric turbulence and allows a single polarimeter to measure both polarization states, mitigating systematic effects that arise when differencing orthogonal detectors. To modulate the full detector array while avoiding excess photon loading due to thermal emission, the CHWP must have a clear-aperture diameter of > 450 mm and be cooled to < 100 K. We have designed a 454 mm clear-aperture, < 65 K CRS using a superconducting magnetic bearing driven by a synchronous magnetic motor. We present the specifications for the CRS, its interfacing to the PB2b/c receiver cryostat, its performance in a stand-alone test, and plans for future work.",

keywords = "Cosmic microwave background, Cryogenic, Half-wave plate, Modulation, POLARBEAR, Polarization, Superconducting magnetic bearing",

author = "Hill, {C. A.} and A. Kusaka and P. Barton and B. Bixler and Droster, {A. G.} and M. Flament and S. Ganjam and A. Jadbabaie and O. Jeong and Lee, {A. T.} and A. Madurowicz and Matsuda, {F. T.} and T. Matsumura and A. Rutkowski and Y. Sakurai and Sponseller, {D. R.} and A. Suzuki and R. Tat",

note = "Funding Information: Acknowledgements We gratefully acknowledge support for PB2b/c CRS development from the National Science Foundation through MSIP Grant #1440338 as well as the Laboratory Directed Research and Development Program at Lawrence Berkeley National Laboratory. Publisher Copyright: {\textcopyright} 2018, Springer Science+Business Media, LLC, part of Springer Nature.",

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doi = "10.1007/s10909-018-1980-6",

language = "English",

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T1 - A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment

AU - Hill, C. A.

AU - Kusaka, A.

AU - Barton, P.

AU - Bixler, B.

AU - Droster, A. G.

AU - Flament, M.

AU - Ganjam, S.

AU - Jadbabaie, A.

AU - Jeong, O.

AU - Lee, A. T.

AU - Madurowicz, A.

AU - Matsuda, F. T.

AU - Matsumura, T.

AU - Rutkowski, A.

AU - Sakurai, Y.

AU - Sponseller, D. R.

AU - Suzuki, A.

AU - Tat, R.

N1 - Funding Information: Acknowledgements We gratefully acknowledge support for PB2b/c CRS development from the National Science Foundation through MSIP Grant #1440338 as well as the Laboratory Directed Research and Development Program at Lawrence Berkeley National Laboratory. Publisher Copyright: © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - We describe the design of a cryogenic rotation stage (CRS) for use with the cryogenic half-wave plate (CHWP) polarization modulator on the POLARBEAR-2b and POLARBEAR-2c (PB2b/c) cosmic microwave background (CMB) experiments, the second and third installments of the Simons Array. Rapid modulation of the CMB polarization signal using a CHWP suppresses 1/f contamination due to atmospheric turbulence and allows a single polarimeter to measure both polarization states, mitigating systematic effects that arise when differencing orthogonal detectors. To modulate the full detector array while avoiding excess photon loading due to thermal emission, the CHWP must have a clear-aperture diameter of > 450 mm and be cooled to < 100 K. We have designed a 454 mm clear-aperture, < 65 K CRS using a superconducting magnetic bearing driven by a synchronous magnetic motor. We present the specifications for the CRS, its interfacing to the PB2b/c receiver cryostat, its performance in a stand-alone test, and plans for future work.

AB - We describe the design of a cryogenic rotation stage (CRS) for use with the cryogenic half-wave plate (CHWP) polarization modulator on the POLARBEAR-2b and POLARBEAR-2c (PB2b/c) cosmic microwave background (CMB) experiments, the second and third installments of the Simons Array. Rapid modulation of the CMB polarization signal using a CHWP suppresses 1/f contamination due to atmospheric turbulence and allows a single polarimeter to measure both polarization states, mitigating systematic effects that arise when differencing orthogonal detectors. To modulate the full detector array while avoiding excess photon loading due to thermal emission, the CHWP must have a clear-aperture diameter of > 450 mm and be cooled to < 100 K. We have designed a 454 mm clear-aperture, < 65 K CRS using a superconducting magnetic bearing driven by a synchronous magnetic motor. We present the specifications for the CRS, its interfacing to the PB2b/c receiver cryostat, its performance in a stand-alone test, and plans for future work.

KW - Cosmic microwave background

KW - Cryogenic

KW - Half-wave plate

KW - Modulation

KW - POLARBEAR

KW - Polarization

KW - Superconducting magnetic bearing

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SP - 851

EP - 859

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 5-6

ER -

A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment

Abstract

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