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

*Corresponding author for this work

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
EventHigh-Energy Detectors in Astronomy - Glasgow, United Kingdom
Duration: 2004 Jun 222004 Jun 23


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