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GroundBIRD: A CMB Polarization Experiment with MKID Arrays

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Abstract

GroundBIRD is a ground-based experiment for a precise observation of the cosmic microwave background (CMB) polarizations. To achieve high sensitivity at large angular scales, we adopt three features in this experiment: fast rotation scanning, microwave kinetic inductance detector (MKID), and cold optics. The rotation scanning strategy has the advantage to suppress 1/f noise. It also provides a large sky coverage of 40%, which corresponds to the large angular scales of \(l \sim 6\). This allows us to constrain the tensor-to-scalar ratio by using low l B-mode spectrum. The focal plane consists of 7 MKID arrays for two target frequencies, 145 GHz and 220 GHz band. There are 161 pixels in total, of which 138 are for 145 GHz and 23 are for 220 GHz. This array is currently under development, and the prototype will soon be evaluated in telescope. The GroundBIRD telescope will observe the CMB at the Teide observatory. The telescope was moved from Japan to Tenerife and is now under test. We present the status and plan of the GroundBIRD experiment.

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Acknowledgements

This work was supported by JSPS KAKENHI Grant Numbers JP15H05743, JP16J09435, JP18H05539, JP18J01831, JP15K13491, JP19H01916, JPR2804, and by the NRF Grant Number NRF-2017R1A2B3001968. This was also supported by Kyoto University and MEXT SPIRITS grant. We also thank Hisao Kawano, Noboru Furukawa, Hiroshi Watanabe, Advanced Technology Center of National Astronomical Observatory of Japan, and Advanced Manufacturing Support Team of RIKEN.

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Authors and Affiliations

  1. Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea

    K. Lee, Y. Jo, J. Moon & E. Won

  2. Institute of Basic Science, 70, Yuseong-daero 1689-gil, Yuseong-gu, Daejeon, Republic of Korea

    J. Choi

  3. Instituto de Astrofísica de Canarias, 38205, La Laguna, Tenerife, Spain

    R. T. Génova-Santos, M. Peel, R. Rebolo & J. A. Rubiño-Martín

  4. Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain

    R. T. Génova-Santos, M. Peel, R. Rebolo & J. A. Rubiño-Martín

  5. Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan

    M. Hattori, H. Ishida & H. Kutsuma

  6. The High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan

    M. Hazumi, T. Uchida & M. Yoshida

  7. The Graduate University for Advanced Studies (SOKENDAI), Shonan Village, Hayama, Kanagawa, 240-0193, Japan

    M. Hazumi, H. Ishitsuka, T. Uchida & M. Yoshida

  8. Kyoto University, Yoshidahonmachi, Sakyo Ward, Kyoto, 606-8501, Japan

    S. Honda, T. Ikemitsu, J. Komine, J. Suzuki & O. Tajima

  9. Institute of Physical and Chemical Research, 2-1 Hirasawa, Wako, Saitama, 351-0198, Japan

    H. Ishida, H. Kutsuma, S. Mima, T. Nagasaki, S. Oguri & C. Otani

  10. Delft University of Technology, Mekelweg 5, 2628 CD, Delft, The Netherlands

    K. Karatsu

  11. The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8654, Japan

    K. Kiuchi, M. Minowa & N. Tomita

  12. Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, 338-8570, Japan

    R. Koyano, M. Naruse & T. Taino

  13. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan

    M. Nagai

  14. Japan Aerospace Exploration Agency (JAXA), 7-44-1 Jindaiji, Higashi-machi, Chofu-shi, Tokyo, 182-8522, Japan

    Y. Sekimoto

Authors
  1. K. Lee
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  2. J. Choi
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  3. R. T. Génova-Santos
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  4. M. Hattori
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  15. H. Kutsuma
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  16. S. Mima
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  17. M. Minowa
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  18. J. Moon
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  19. M. Nagai
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  20. T. Nagasaki
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  21. M. Naruse
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  22. S. Oguri
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  23. C. Otani
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  24. M. Peel
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  25. R. Rebolo
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  26. J. A. Rubiño-Martín
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  27. Y. Sekimoto
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  28. J. Suzuki
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  29. T. Taino
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  30. O. Tajima
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  31. N. Tomita
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  32. T. Uchida
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  33. E. Won
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  34. M. Yoshida
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Correspondence to K. Lee.

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Lee, K., Choi, J., Génova-Santos, R.T. et al. GroundBIRD: A CMB Polarization Experiment with MKID Arrays. J Low Temp Phys 200, 384–391 (2020). https://doi.org/10.1007/s10909-020-02511-5

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  • DOI: https://doi.org/10.1007/s10909-020-02511-5

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