Simulation of TES X-ray Microcalorimeters Designed for 14.4 keV Solar Axion Search

Shohei Mori*, Y. Nishida, N. Iyomoto, Y. Yagi, R. Konno, T. Hayashi, K. Tanaka, N. Y. Yamasaki, K. Mitsuda, R. Sato, M. Saito, T. Homma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This study attempted to develop detection methods for solar axions using transition-edge-sensor (TES) microcalorimeters. Since the axion absorber comprised of iron-57 (57Fe) is electroplated upon the membrane instead of directly onto the TES itself (with the absorber hence thermally connected to the TES via a gold thermal strap), some of the heat deposited into the absorber consequently escapes into the heat bath through the membrane before being detected by the TES. If the heat-loss depends upon the axion interaction position within the absorber, position dependence may degrade the energy resolution. Therefore, this study endeavored to evaluate the dependence of heat-loss and pulse shape on axion incident position with the COMSOL Multiphysics software package (using a finite element method). In addition, heat-loss and pulse shape were likewise evaluated when the energy was deposited directly within the gold thermal strap.

Original languageEnglish
Pages (from-to)518-524
Number of pages7
JournalJournal of Low Temperature Physics
Issue number3-4
Publication statusPublished - 2022 Nov


  • Microcalorimeters
  • Sensors
  • Solar axions
  • TES

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics


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