Deployment of POLARBEAR-2b

Author:

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

Abstract

AbstractPOLARBEAR-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 $$\sim$$ 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

Publisher

Springer Science and Business Media LLC

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