Calibration of detector time constant with a thermal source for the POLARBEAR-2A CMB polarization experiment

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Main Authors:	Takatori, S., Hasegawa, M., Hazumi, M., Kaneko, D., Katayama, N., Lee, A. T., Takakura, S., Tomaru, T., Adkins, T., Barron, D., Chinone, Y., Crowley, K. T., de Haan, T., Elleflot, T., Farias, N., Feng, C., Fujino, T., Groh, J. C., Hirose, H., Matsuda, F., Nishino, H., Segawa, Y., Siritanasak, P., Suzuki, A., Yamada, K.
Format:	Preprint
Published:	2024
Subjects:	Instrumentation and Methods for Astrophysics
Online Access:	Acceder al recurso
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author	Takatori, S. Hasegawa, M. Hazumi, M. Kaneko, D. Katayama, N. Lee, A. T. Takakura, S. Tomaru, T. Adkins, T. Barron, D. Chinone, Y. Crowley, K. T. de Haan, T. Elleflot, T. Farias, N. Feng, C. Fujino, T. Groh, J. C. Hirose, H. Matsuda, F. Nishino, H. Segawa, Y. Siritanasak, P. Suzuki, A. Yamada, K.
author_facet	Takatori, S. Hasegawa, M. Hazumi, M. Kaneko, D. Katayama, N. Lee, A. T. Takakura, S. Tomaru, T. Adkins, T. Barron, D. Chinone, Y. Crowley, K. T. de Haan, T. Elleflot, T. Farias, N. Feng, C. Fujino, T. Groh, J. C. Hirose, H. Matsuda, F. Nishino, H. Segawa, Y. Siritanasak, P. Suzuki, A. Yamada, K.
contents	The Simons Array (SA) project is a ground-based Cosmic Microwave Background (CMB) polarization experiment. The SA observes the sky using three telescopes, and POLARBEAR-2A (PB-2A) is the receiver system on the first telescope. For the ground-based experiment, atmospheric fluctuation is the primary noise source that could cause polarization leakage. In the PB-2A receiver system, a continuously rotating half-wave plate (HWP) is used to mitigate the polarization leakage. However, due to the rapid modulation of the polarization signal, the uncertainty in the time constant of the detector results in an uncertainty in the polarization angle. For PB-2A, the time constant of each bolometer needs to be calibrated at the sub-millisecond level to avoid introducing bias to the polarization signal. We have developed a new calibrator system that can be used to calibrate the time constants of the detectors. In this study, we present the design of the calibration system and the preliminary results of the time constant calibration for PB-2A.
format	Preprint
id	arxiv_https___arxiv_org_abs_2403_16620
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Calibration of detector time constant with a thermal source for the POLARBEAR-2A CMB polarization experiment Takatori, S. Hasegawa, M. Hazumi, M. Kaneko, D. Katayama, N. Lee, A. T. Takakura, S. Tomaru, T. Adkins, T. Barron, D. Chinone, Y. Crowley, K. T. de Haan, T. Elleflot, T. Farias, N. Feng, C. Fujino, T. Groh, J. C. Hirose, H. Matsuda, F. Nishino, H. Segawa, Y. Siritanasak, P. Suzuki, A. Yamada, K. Instrumentation and Methods for Astrophysics The Simons Array (SA) project is a ground-based Cosmic Microwave Background (CMB) polarization experiment. The SA observes the sky using three telescopes, and POLARBEAR-2A (PB-2A) is the receiver system on the first telescope. For the ground-based experiment, atmospheric fluctuation is the primary noise source that could cause polarization leakage. In the PB-2A receiver system, a continuously rotating half-wave plate (HWP) is used to mitigate the polarization leakage. However, due to the rapid modulation of the polarization signal, the uncertainty in the time constant of the detector results in an uncertainty in the polarization angle. For PB-2A, the time constant of each bolometer needs to be calibrated at the sub-millisecond level to avoid introducing bias to the polarization signal. We have developed a new calibrator system that can be used to calibrate the time constants of the detectors. In this study, we present the design of the calibration system and the preliminary results of the time constant calibration for PB-2A.
title	Calibration of detector time constant with a thermal source for the POLARBEAR-2A CMB polarization experiment
topic	Instrumentation and Methods for Astrophysics
url	https://arxiv.org/abs/2403.16620

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