Thermal analysis of a prototype cryogenic polarization modulator for use in a space-borne CMB polarization experiment

T. Iida, Y. Sakurai, T. Matsumura, H. Sugai, H. Imada, H. Kataza, H. Ohsaki, M. Hazumi, N. Katayama, R. Yamamoto, S. Utsunomiya, Y. Terao

研究成果査読

2 被引用数 (Scopus)

抄録

We report a thermal analysis of a polarization modulator unit (PMU) for use in a space-borne cosmic microwave background (CMB) project. A measurement of the CMB polarization allows us to probe the physics of early universe, and that is the best method to test the cosmic inflation experimentally. One of the key instruments for this science is to use a halfwave plate (HWP) based polarization modulator. The HWP is required to rotate continuously at about 1 Hz below 10 K to minimize its own thermal emission to a detector system. The rotating HWP system at the cryogenic environment can be realized by using a superconducting magnetic bearing (SMB) without significant heat dissipation by mechanical friction. While the SMB achieves the smooth rotation due to the contactless bearing, an estimation of a levitating HWP temperature becomes a challenge. We manufactured a one-eighth scale prototype model of PMU and built a thermal model. We verified our thermal model with the experimental data. We forecasted the projected thermal performance of PMU for a full-scale model based on the thermal model. From this analysis, we discuss the design requirement toward constructing the full-scale model for use in a space environment such as a future CMB satellite mission, LiteBIRD.

本文言語English
論文番号012011
ジャーナルIOP Conference Series: Materials Science and Engineering
278
1
DOI
出版ステータスPublished - 12月 30 2017
外部発表はい
イベント2017 Cryogenic Engineering Conference, CEC 2017 - Madison
継続期間: 7月 9 20177月 13 2017

ASJC Scopus subject areas

  • 材料科学(全般)
  • 工学(全般)

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