Laboratory calibration system for CMB polarization detectors

M. Hasegawa, O. Tajima, Y. Chinone, M. Hazumi, K. Ishidoshiro, M. Nagai

Research output: Contribution to journalArticlepeer-review


We present a novel system to calibrate millimeter-wave polarimeters for CMB polarization measurements. This technique is an extension of the conventional metal mirror rotation approach, however it employs cryogenically-cooled blackbody absorbers. The primary advantage of this system is that it can generate a slightly polarized signal (∼100 mK) in the laboratory; this is at a similar level to that measured by ground-based CMB polarization experiments observing a ∼10 K sky. It is important to reproduce the observing condition in the laboratory for reliable characterization of polarimeters before deployment. In this paper, we present the design and principle of the system, and demonstrate its use with a coherent-type polarimeter used for QUIET. This technique can also be applied to incoherent-type polarimeters and it is very promising for the nextgeneration CMB polarization experiments.

Original languageEnglish
Pages (from-to)892-897
Number of pages6
JournalJournal of Low Temperature Physics
Issue number5-6
Publication statusPublished - 2012 Jun


  • Calibration
  • Cosmic microwave background
  • Gravitational waves
  • Microwave receivers
  • Polarization


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