Journal of Low Temperature Physics

, Volume 184, Issue 3–4, pp 786–792 | Cite as

GroundBIRD: Observing Cosmic Microwave Polarization at Large Angular Scale with Kinetic Inductance Detectors and High-Speed Rotating Telescope

  • S. Oguri
  • J. Choi
  • T. Damayanthi
  • M. Hattori
  • M. Hazumi
  • H. Ishitsuka
  • K. Karatsu
  • S. Mima
  • M. Minowa
  • T. Nagasaki
  • C. Otani
  • Y. Sekimoto
  • O. Tajima
  • N. Tomita
  • M. Yoshida
  • E. Won
  • For the GroundBIRD group
Article

Abstract

Cosmic microwave background (CMB) is an important source of information about the origin of our universe. In particular, odd-parity large angular scale patterns in the CMB polarization, the primordial B-modes, are strong evidence for an inflationary universe, related to the accelerating expansion of the metric. We are developing a unique telescope, GroundBIRD, to take CMB polarization measurements. The telescope combines novel techniques: high-speed rotation scanning, cold optics, and microwave kinetic inductance detectors (MKIDs). We evaluated the response of MKIDs on the rotation stage. Method of shielding from the geo-magnetic field is established. We have also developed a receiver cryostat. We are able to maintain a sufficient cold status for observations on the optical configuration. We plan to start commissioning the system by observing CMB in Japan in 2015–2016. We will then deploy GroundBIRD in the Canary Islands for further scientific observations.

Keywords

Cosmic microwave background Polarization Microwave kinetic inductance detector 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • S. Oguri
    • 1
  • J. Choi
    • 2
  • T. Damayanthi
    • 3
  • M. Hattori
    • 4
  • M. Hazumi
    • 1
    • 5
  • H. Ishitsuka
    • 5
  • K. Karatsu
    • 6
  • S. Mima
    • 3
  • M. Minowa
    • 7
  • T. Nagasaki
    • 1
  • C. Otani
    • 3
  • Y. Sekimoto
    • 6
  • O. Tajima
    • 1
    • 5
  • N. Tomita
    • 7
  • M. Yoshida
    • 1
  • E. Won
    • 2
  • For the GroundBIRD group
  1. 1.Institute of Particle and Nuclear StudiesHigh Energy Accelerator Research Organization (KEK)TsukubaJapan
  2. 2.Korea UniversitySeoulRepublic of Korea
  3. 3.RIKENWakoJapan
  4. 4.Tohoku UniversitySendaiJapan
  5. 5.The Graduate University for Advanced Studies (SOKENDAI), Shonan VillageHayamaJapan
  6. 6.National Astronomical Observatory of Japan (NAOJ)MitakaJapan
  7. 7.The University of TokyoBunkyo-kuJapan

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