Commissioning the CMB polarization telescope GroundBIRD with the full set of detectors
Miku Tsujii (1), Jochem J.A. Baselmans (2,3), Jihoon Choi (4), Antonio, H.M. Coppens (2), Alessandro Fasano (5), Ricardo Tanaus\'u G\'enova-Santos, (5), Makoto Hattori (1), Masashi Hazumi (6,7), Shunsuke Honda (8), Takuji, Ikemitsu (9), Hidesato Ishida (10,11)

TL;DR
GroundBIRD is a CMB polarization telescope using MKID detectors, now fully operational with upgraded arrays, aiming to measure the reionization optical depth and improve systematics understanding.
Contribution
This paper reports the commissioning and full deployment of MKID detectors in GroundBIRD, enabling precise polarization measurements of the CMB on large angular scales.
Findings
Successful installation and validation of MKID arrays in May 2023
Initial polarization response tests and celestial observations completed
GroundBIRD is now conducting scientific observations remotely
Abstract
GroundBIRD is a ground-based cosmic microwave background (CMB) experiment for observing the polarization pattern imprinted on large angular scales ( ) from the Teide Observatory in Tenerife, Spain. Our primary scientific objective is a precise measurement of the optical depth () to the reionization epoch of the Universe to cross-check systematic effects in the measurements made by previous experiments. GroundBIRD observes a wide sky area in the Northern Hemisphere ( of the full sky) while continuously rotating the telescope at a high speed of up to 20 rotations per minute (rpm) to overcome the fluctuations of atmospheric radiation. We have adopted the NbTiN/Al hybrid microwave kinetic inductance detectors (MKIDs) as focal plane detectors. We observe two frequency bands centered at 145 GHz and 220 GHz. The 145 GHz band picks up the peak…
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