JLow Temp Phys https://doi.org/10.1007/s10909-018-1980-6 A Large-Diameter Cryogenic Rotation Stage for Half-Wave Plate Polarization Modulation on the POLARBEAR-2 Experiment 1,2 2,3 2 2 2 C. A. Hill · A. Kusaka · P. Barton · B. Bixler · A. G. Droster · 2 1,2 2 1 1,2,4 M. Flament · S. Ganjam · A. Jadbabaie · O. Jeong · A. T. Lee · 2 5 5 2 A. Madurowicz · F. T. Matsuda · T. Matsumura · A. Rutkowski · 5 2 2 1,2 Y. Sakurai · D. R. Sponseller · A. Suzuki · R. Tat Received: 6 November 2017 / Accepted: 21 May 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018 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 tur- bulence 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
Journal of Low Temperature Physics – Springer Journals
Published: May 30, 2018
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