@inproceedings{5ff2e23ca6f34bb99394b46ca5ac0338,
title = "Design and development of a polarization modulator unit based on a continuous rotating half-wave plate for LiteBIRD",
abstract = "We present our design and development of a polarization modulator unit (PMU) for LiteBIRD space mission. LiteBIRD is a next generation cosmic microwave background (CMB) polarization satellite to measure the primordial B-mode. The science goal of LiteBIRD is to measure the tensor-to-scalar ratio with the sensitivity of δr < 10-3. The baseline design of LiteBIRD is to employ the PMU based on a continuous rotating half-wave plate (HWP) at a telescope aperture with a diameter of 400 mm. It is an essential for LiteBIRD to achieve the science goal because it significantly reduces detector noise and systematic uncertainties. The LiteBIRD PMU consists of a multi-layered sapphire as a broadband achromatic HWP and a mechanism to continuously rotate it at 88 rpm. The whole system is maintained at below 10K to minimize the thermal emission from the HWP. In this paper, we discuss the current development status of the broadband achromatic HWP and the cryogenic rotation mechanism.",
keywords = "Cosmic microwave background, LiteBIRD, broadband achromatic half-wave plate, cryogenic rotation mechanism, inflation, millimeter-wave polarization, polarization modulator, space program",
author = "Yuki Sakurai and Tomotake Matsumura and Nobuhiko Katayama and Hiroaki Imada and Kunimoto Komatsu and Hiroaki Kanai and Ryota Takaku and Shinya Sugiyama and Tommaso Ghigna and Teruhito Iida and Hajime Sugai and Hiroyuki Ohsaki and Yutaka Terao and Toshiki Shimomura and Kuniaki Konishi and Haruyuki Sakurai and Junji Yumoyo and Muneyoshi Maki and Junichi Suzuki and Hirokazu Ishino and Shogo Nakamura and Akito Kusaka and Charles Hill and Masashi Hazumi and Hirokazu Kataza and Shin Utsunomiya and Ryo Yamamoto and Makoto Tashiro and Yukikatsu Terada",
note = "Funding Information: This work was supported by MEXT KAKENHI Grant Numbers JP17H01125, JP17K14272, JP15H05441. This work was also supported by JSPS Core-to-Core Program, A. Advanced Research Networks and World Premier International Research Center Initiative (WPI), MEXT, Japan. Publisher Copyright: {\textcopyright} 2018 SPIE.; Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 ; Conference date: 12-06-2018 Through 15-06-2018",
year = "2018",
doi = "10.1117/12.2312391",
language = "English",
isbn = "9781510619692",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Jonas Zmuidzinas and Jian-Rong Gao",
booktitle = "Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX",
}