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

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 - Nov 2022

All Science Journal Classification (ASJC) codes

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


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