Development of a cryogenic remote sensing thermometer for CMB polarization experiment

Y. Sakurai, T. Matsumura, N. Katayama, H. Kanai, T. Iida

Research output: Contribution to conferencePaperpeer-review

2 Citations (Scopus)

Abstract

We present about the remote sensing thermometer working at cryogenic temperature for a polarization modulator used in cosmic microwave background (CMB) polarization experiment. The polarization modulator employs a superconducting magnetic bearing (SMB) in order to realize a continuous rotation at cryogenic temperature with minimal heat dissipation. The cryogenic remote thermometer is a critical development item in the polarization modulator in order to measure cryogenic, contactless and spinning rotor. We propose a novel idea to take an advantage of a temperature dependent nature in NdFeB permanent magnet. The remnance of the NdFeB peaks about 100 K and decrease as its temperature becomes lower. A simple implementation of a cryogenic Hall sensor at a vicinity of the NdFeB enables to construct a cryogenic remote temperature sensor. We calibrated the thermometer using small NdFeB magnet and applied it to a ~ 400 mm SMB prototype system in a 4 K cryostat with GM cooler. The obtained temperature value is good agreement with the resistive thermometer and the accuracy is ± 0.4 K in the range from 4 K to 20 K. The results are good enough to use in the polarization modulator.

Original languageEnglish
Pages169-174
Number of pages6
Publication statusPublished - 2018
Externally publishedYes
Event29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018 - Pasadena, United States
Duration: Mar 26 2018Mar 28 2018

Conference

Conference29th IEEE International Symposium on Space Terahertz Technology, ISSTT 2018
Country/TerritoryUnited States
CityPasadena
Period3/26/183/28/18

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation

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