GroundBIRD: Observation of CMB Polarization with a Rapid Scanning and MKIDs

T. Nagasaki, J. Choi, R. T. Génova-Santos, M. Hattori, M. Hazumi, H. Ishitsuka, K. Karatsu, K. Kikuchi, R. Koyano, H. Kutsuma, K. Lee, S. Mima, M. Minowa, M. Nagai, M. Naruse, S. Oguri, C. Otani, R. Rebolo, J. A. Rubiño-Martín, Y. SekimotoM. Semoto, J. Suzuki, T. Taino, O. Tajima, N. Tomita, T. Uchida, E. Won, M. Yoshida

研究成果: Article査読

3 被引用数 (Scopus)


Cosmic microwave background (CMB) radiation is an afterglow from the Big Bang. CMB contains rich information about the early stage of the universe. In particular, odd-parity patterns (B-mode) in the CMB polarization on a large angular scale would provide an evidence of the cosmic inflation. The aim of the GroundBIRD experiment is to observe the B-mode on large angular scales from the ground. One of the most novel characteristics of the telescope used for this experiment is its rapid rotational scanning technique. In addition, the telescope uses cold optics and microwave kinetic inductance detectors. We have developed a telescope mount with a three-axis rotation mechanism (azimuth, elevation, and boresight) and measured the vibration at the focal plane stage at 20 RPM scan rotation rate. We also performed focal plane detector tests on this mount. The tests confirmed the expected response from the geomagnetism associated with the mount rotation. We have also developed a design for the magnetic shields and a detector array on a 3-in wafer. The preparations to begin the observations at the Teide Observatory in the Canary Islands in 2018 are proceeding smoothly.

ジャーナルJournal of Low Temperature Physics
出版ステータスPublished - 2018 12 1

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 材料科学(全般)
  • 凝縮系物理学


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