On-site detector noise characterization of the POLARBEAR-2A receiver

Nicole Farias; Megan Russell; Daisuke Kaneko; Sayuri Takatori; Adrian T. Lee; Kam Arnold; Tylor Adkins; Darcy R Barron; Kevin T. Crowley; Tucker Elleflot; Takuro Fujino; Masaya Hasegawa; Jennifer Ito; Lindsay N. Lowry; Yume Nishinomiya; Christopher Raum; Praween Siritanasak; Benjamin Westbrook; Kyohei Yamada

doi:10.1117/12.2627513

31 August 2022 On-site detector noise characterization of the POLARBEAR-2A receiver

Nicole Farias, Megan Russell, Daisuke Kaneko, Sayuri Takatori, Adrian T. Lee, Kam Arnold, Tylor Adkins, Darcy R Barron, Kevin T. Crowley, Tucker Elleflot, Takuro Fujino, Masaya Hasegawa, Jennifer Ito, Lindsay N. Lowry, Yume Nishinomiya, Christopher Raum, Praween Siritanasak, Benjamin Westbrook, Kyohei Yamada

Author Affiliations +

Proceedings Volume 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI; 121901U (2022) https://doi.org/10.1117/12.2627513
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The Simons Array is an experiment located in the Atacama Desert in Chile that will measure the polarization anisotropy of the Cosmic Microwave Background. It consists of three telescopes that house the receivers POLARBEAR-2A, POLARBEAR-2B and POLARBEAR-2C, which will observe the CMB at 90, 150, 220 and 270 GHz with over 22,000 Transition Edge Sensor (TES) bolometers. Each receiver contains a focal plane composed of seven hexagonal arrays of lenslet-coupled sinuous antenna bolometers, with each dichroic pixel containing four TESs. The readout system uses Superconducting Quantum Interference Devices for signal amplification and digital frequency-domain multiplexing with a multiplexing factor of 40. The sensitivity of the Simons Array instruments is governed by the detectors’ noise level and the telescope optical throughput, thus an on-site signal to noise characterization is essential to evaluate the instrument. We present the post-deployment measured readout noise and methods used to improve the noise performance of POLARBEAR-2A detectors, which measure radiation in the 90 and 150 GHz bands.

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Nicole Farias, Megan Russell, Daisuke Kaneko, Sayuri Takatori, Adrian T. Lee, Kam Arnold, Tylor Adkins, Darcy R Barron, Kevin T. Crowley, Tucker Elleflot, Takuro Fujino, Masaya Hasegawa, Jennifer Ito, Lindsay N. Lowry, Yume Nishinomiya, Christopher Raum, Praween Siritanasak, Benjamin Westbrook, and Kyohei Yamada "On-site detector noise characterization of the POLARBEAR-2A receiver", Proc. SPIE 12190, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI, 121901U (31 August 2022); https://doi.org/10.1117/12.2627513

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