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Recent Developments for the Terahertz Photon Detector System: Detector and Cryogenics

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Abstract

Recent developments on the detector and the cryogenics for the terahertz photon detector system are discussed. The detector has been redesigned for improved performance, which exhibited optical efficiency of 6% at 530 GHz. Cryogenics for the detector system has been newly developed which employs a pulse-tube cooler with two originally developed compact 4He sorption fridges. Initial experiments demonstrated continuous cooling by altering operation of two sorption fridges, supported by a pulse-tube cooler with cooling power of 0.4 W.

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Acknowledgements

Special thanks to Dr. Wenlei Shan, Dr. Takafumi Kojima, Dr. Tom Nitta, and Dr. Tai Oshima for fruitful discussions and their supports. This research was performed at the Advanced Technology Center of NAOJ, with financial supports of Grant-in-Aid for Exploratory Research of JSPS KAKENHI grant numbers 15K13469, 18H05326, 18H05327, 20K20345 and 20K20346, and ISAS/JAXA basic R&D for future space science missions. A.N. is financially supported by JSPS Research Fellowship for Young Scientists.

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Authors and Affiliations

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

    Hajime Ezawa, Hiroshi Matsuo, Ayako Niwa, Norio Okada & Mitsuhiro Fukushima

  2. The Graduate University for Advanced Studies, SOKENDAI, 2-21-1 Osawa, Mitaka, Tokyo, 181-8588, Japan

    Hajime Ezawa & Hiroshi Matsuo

  3. Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan

    Ayako Niwa

  4. National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan

    Go Fujii

  5. National Institute of Advanced Industrial Science and Technology, 807-1 Shuku-machi, Tosu, Saga, 841-0052, Japan

    Shigetomo Shiki

Authors
  1. Hajime Ezawa
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  2. Hiroshi Matsuo
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  3. Ayako Niwa
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  4. Norio Okada
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  5. Mitsuhiro Fukushima
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  6. Go Fujii
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  7. Shigetomo Shiki
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Contributions

H.E. and H.M. wrote the manuscript. All authors contributed to discuss the design and developments in various aspects of this work. H.E., H.M. and A.N. mainly performed the experiments, measurements, and data analysis. G.F. and S.S. conducted the fabrication of the superconducting detector, and N.O. and M.F. have led the mechanical engineering of the cryogenics. All authors reviewed the manuscript.

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Correspondence to Hajime Ezawa.

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Ezawa, H., Matsuo, H., Niwa, A. et al. Recent Developments for the Terahertz Photon Detector System: Detector and Cryogenics. J Low Temp Phys (2024). https://doi.org/10.1007/s10909-024-03128-8

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