Development of a microcalorimeter array for the Diffuse Intergalactic Oxygen Surveyor (DIOS) mission

Yoshitaka Ishisaki, Takaya Ohashi, Tai Oshima, Umeyo Morita, Keisuke Shinozaki, Kosuke Sato, Kazuhisa Mitsuda, Noriko Y. Yamasaki, Ryuichi Fujimoto, Yoh Takei, Hirotaka Sato, Noriyuki Takahashi, Takayuki Homma, Tetsuya Osaka

Research output: Contribution to journalConference articlepeer-review

12 Citations (Scopus)


We are developing a superconducting transition-edge sensor (TES) microcalorimeter array for the Diffuse Intergalactic Oxygen Surveyor (DIOS) mission. DIOS is a relatively small Japanese X-ray mission which will study large-scale distribution of the warm-hot intergalactic medium (WHIM) using OVII and OVIII emission lines. The satellite weighs about 400 kg equipped with a four-reflection X-ray telescope (FXT) and a TES microcalorimeter array (XSA). The design goal of the observing system is an effective area larger than 100 cm2 at the oxygen line energy, a field of view about 50 arcmin square, and an energy resolution about 2 eV in the energy range of 0.3-1 keV. The TES microcalorimeter array provides the large field of view and good energy resolution at the same time. We plan to install an array comprising 16 × 16 pixels with an overall size of 1 cm square, which is cooled with a cryogen-free cooler. Pixels are readout by multiplexing signals using a multi-input SQUID amplifier, with each input connected to a TES microcalorimeter which is AC biased with a different frequency. We report the design and present status of the XSA system development.

Original languageEnglish
Article number18
Pages (from-to)123-134
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2004 Dec 1
EventHigh-Energy Detectors in Astronomy - Glasgow, United Kingdom
Duration: 2004 Jun 222004 Jun 23


  • Adiabatic demagnetization refrigerator
  • ADR
  • DIOS
  • Frequency domain multiplex
  • Microcalorimeter
  • TES
  • Transition edge sensor
  • Warm-hot intergalactic medium
  • WHIM
  • X-ray
  • XSA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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