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The POLARBEAR Fourier transform spectrometer calibrator and spectroscopic characterization of the POLARBEAR instrument
journal contribution
posted on 2023-06-09, 19:43 authored by F Matsuda, L Lowry, A Suzuki, M Aguilar Fáundez, K Arnold, D Barron, F Bianchini, K Cheung, Y Chinone, T Elleflot, Giulio Fabbian, N Goeckner-Wald, M Hasegawa, D Kaneko, N Katayama, B Keating, A T Lee, M Navaroli, H Nishino, H Paar, G Puglisi, P L Richards, J Seibert, P Siritanasak, O Tajima, S Takatori, C Tsai, B WestbrookWe describe the Fourier Transform Spectrometer (FTS) used for in-field testing of the POLARBEAR receiver, an experiment located in the Atacama Desert of Chile which measures the cosmic microwave background (CMB) polarization. The POLARBEAR-FTS (PB-FTS) is a Martin-Puplett interferometer designed to couple to the Huan Tran Telescope (HTT) on which the POLARBEAR receiver is installed. The PB-FTS measured the spectral response of the POLARBEAR receiver with signal-to-noise ratio >20 for ~69% of the focal plane detectors due to three features: a high throughput of 15.1 sr cm2, optimized optical coupling to the POLARBEAR optics using a custom designed output parabolic mirror, and a continuously modulated output polarizer. The PB-FTS parabolic mirror is designed to mimic the shape of the 2.5 m-diameter HTT primary reflector, which allows for optimum optical coupling to the POLARBEAR receiver, reducing aberrations and systematics. One polarizing grid is placed at the output of the PB-FTS and modulated via continuous rotation. This modulation allows for decomposition of the signal into different harmonics that can be used to probe potentially pernicious sources of systematic error in a polarization-sensitive instrument. The high throughput and continuous output polarizer modulation features are unique compared to other FTS calibrators used in the CMB field. In-field characterization of the POLARBEAR receiver was accomplished using the PB-FTS in April 2014. We discuss the design, construction, and operation of the PB-FTS and present the spectral characterization of the POLARBEAR receiver. We introduce future applications for the PB-FTS in the next-generation CMB experiment, the Simons Array.
Funding
Precision cosmological parameters : CosmoPars; G1365; EUROPEAN UNION; 616170 ERC-2013-CoG
Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1
History
Publication status
- Published
File Version
- Accepted version
Journal
Review of Scientific InstrumentsISSN
0034-6748Publisher
AIP PublishingExternal DOI
Issue
11Volume
90Page range
1-18Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Astronomy Centre Publications
Notes
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (citation of published article) and may be found at https://aip.scitation.org/doi/10.1063/1.5095160Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-11-22First Open Access (FOA) Date
2019-11-22First Compliant Deposit (FCD) Date
2019-11-21Usage metrics
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