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.
Original language | English |
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Title of host publication | Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX |
Editors | Jonas Zmuidzinas, Jian-Rong Gao |
Publisher | SPIE |
ISBN (Print) | 9781510619692 |
DOIs | |
Publication status | Published - 2018 |
Event | Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 - Austin, United States Duration: Jun 12 2018 → Jun 15 2018 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 10708 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Other
Other | Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX 2018 |
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Country/Territory | United States |
City | Austin |
Period | 6/12/18 → 6/15/18 |
Keywords
- Cosmic microwave background
- LiteBIRD
- broadband achromatic half-wave plate
- cryogenic rotation mechanism
- inflation
- millimeter-wave polarization
- polarization modulator
- space program
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering