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Design of a Testbed for the Study of System Interference in Space CMB Polarimetry

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Abstract

LiteBIRD is a proposed JAXA satellite mission to measure the CMB B-mode polarization with unprecedented sensitivity (\(\sigma _r\sim 0.001\)). To achieve this goal, 4676 state-of-the-art TES bolometers will observe the whole sky for 3 years from L2. These detectors, as well as the SQUID readout, are extremely susceptible to EMI and other instrumental disturbances, e.g., static magnetic field and vibration. As a result, careful analysis of the interference between the detector system and the rest of the telescope instruments is essential. This study is particularly important during the early phase of the project, in order to address potential problems before the final assembly of the whole instrument. We report our plan for the preparation of a cryogenic testbed to study the interaction between the detectors and other subsystems, especially a polarization modulator unit consisting of a magnetically rotating half-wave plate. We also present the requirements, current status and preliminary results.

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Acknowledgements

TG acknowledges a Oxford-IPMU joint fellowship for funding his doctoral studies. TG, TM, MH, SLS, YS, NK acknowledge Kavli IPMU supported by World Premier International Research Center Initiative (WPI), MEXT, Japan. This work was supported by JSPS KAKENHI Grant Number JP18KK0083 and by JSPS Core-to-Core Program, A. Advanced Research Networks.

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Authors and Affiliations

  1. Sub-department of Astrophysics, University of Oxford, Oxford, OX1 3RH, UK

    T. Ghigna

  2. Kavli IPMU (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba, 277-8583, Japan

    T. Ghigna, T. Matsumura, M. Hazumi, S. L. Stever, Y. Sakurai & N. Katayama

  3. KEK, Tsukuba, Ibaraki, 300-3256, Japan

    M. Hazumi

  4. SOKENDAI, Hayama, Kanagawa, 240-0193, Japan

    M. Hazumi

  5. ISAS-JAXA, Sagamihara, Kanagawa, 252-5210, Japan

    M. Hazumi

  6. LBNL, Berkeley, CA, 94720, USA

    A. Suzuki & A. T. Lee

  7. Department of Physics, University of California Berkeley, Berkeley, CA, 94720, USA

    B. Westbrook & A. T. Lee

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  1. T. Ghigna
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  2. T. Matsumura
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  3. M. Hazumi
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  4. S. L. Stever
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  5. Y. Sakurai
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  6. N. Katayama
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  7. A. Suzuki
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  8. B. Westbrook
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  9. A. T. Lee
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Correspondence to T. Ghigna.

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Ghigna, T., Matsumura, T., Hazumi, M. et al. Design of a Testbed for the Study of System Interference in Space CMB Polarimetry. J Low Temp Phys 199, 622–630 (2020). https://doi.org/10.1007/s10909-020-02359-9

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  • DOI: https://doi.org/10.1007/s10909-020-02359-9

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