Deployment of POLARBEAR-2b

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2024年5月11日

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Megan Russell,
Kana Sakaguri,
Lindsay Ng Lowry,
Tylor Adkins,
Kam Arnold,
Carlo Baccigalupi,
Kevin T. Crowley,
Tucker Elleflot,
Nicole Farias,
Masashi Hazumi,
Jennifer Ito,
Oliver Jeong,
Adrian Lee,
Michael Lew,
Jacob Nelson,
Praween Siritanasak,
Tran Tsan

摘要

POLARBEAR-2b (PB-2b) is the second receiver in the Simons Array, a cosmic microwave background (CMB) polarization experiment. The Simons Array uses dichroic polarization sensitive lenslet-coupled sinuous antennas and transition-edge sensor (TES) bolometers made of superconducting films. These bolometers are read out with frequency multiplexing electronics. PB-2b contains $\sim$ $\sim$ 7500 detectors in two bands at 90 and 150 GHz with arcminute resolution. The polarization of these detectors is modulated by a cryogenic continuously rotating half-wave plate. PB-2b was installed on its telescope in 2022 in the Atacama Desert at an altitude of 5.2 km. This paper will detail initial readout commissioning, test of a new loopgain monitoring method, and focusing the optics. Work is ongoing to commission the remaining ambient temperature readout electronics, measure detector time constants, and observe with the cryogenic half-wave plate spinning