Multi-pixel readout of TES calorimeters

Naoko Iyomoto*, Taro Ichitsubo, Tai Oshima, Kazuhisa Mitsuda, Ryuichi Fujimoto, Kazuo Futamoto, Yoh Takei, Tamayuki Fujimori, Toshiyuki Miyazaki, Yoshitaka Ishisaki, Teppei Hiroike, Umeyo Morita, Noriko Y. Yamasaki, Takeo Koga, Kosuke Sato, Takaya Ohashi, Shuichi Shoji, Hiroyuki Kudo, Tomoaki Nakamura, Takahiro ArakawaHirotaka Sato, Hideomi Kobayashi, Takayuki Homma, Tetsuya Osaka, Satoshi Nakayama, Toshimitsu Morooka, Kazuo Chinone, Keiichi Tanaka, Yoshikatsu Kuroda, Mitsunobu Onishi, Masaya Goto

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


We are developing a superconducting Transition-Edge Sensor (TES) calorimeter array. We adopt calorimeter multiplex in frequency domain to read signals from the calorimeter array with a small number of front-end electronics and wirings. We further utilize Calorimeter Bridge Biased by an AC Generator (CABBAGE) approach1,2 to eliminate the AC carrier in the output. We tested the method using a TES calorimeter, which has a transition temperature of 390 mK. Because of the high operating temperature, energy resolution (ΔE) of the calorimeter is limited to 200 eV at 5.9 keV even when it is biased with a DC current. We operated the calorimeter in CABBAGE circuit with 30 kHz sinusoidal bias and obtained ΔE of 250 eV. We found that there remains a small-amplitude residual in the output even at the bridge balance point. The residual contains not only 30 kHz component but also odd-order harmonics. We consider that this is due to the variation of the TES resistor with the bias current. Some of the degradation of ΔE from DC bias to AC bias can be explained by the fact that some of signal power is carried in the odd-order harmonics, which we did not utilize in the data reduction process. We also succeeded in operate the CABBAGE by 100 kHz, although ΔE was degraded to 380 eV because of unstable bath temperature during the data acquisition and probably because of low response of the signal readout circuit at the frequency.

Original languageEnglish
Pages (from-to)965-974
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number2
Publication statusPublished - 2002
EventX-Ray and Gamma-Ray Telescopes and Instruments for Astronomy - Waikoloa, HI, United States
Duration: 2002 Aug 242002 Aug 28


  • Microcalorimeter
  • Multiplex
  • Superconducting
  • TES
  • X-ray

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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