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Absolute Energy Calibration of X-ray TESs with 0.04 eV Uncertainty at 6.4 keV in a Hadron-Beam Environment



Hideyuki Tatsuno, William B. Doriese, Douglas A. Bennett, Catalina Curceanu, Joseph W. Fowler, Johnathon D. Gard, Fredrick P. Gustafsson, Tadashi Hashimoto, Ryugo S. Hayano, James P. Hays-Wehle, Gene C. Hilton, Mihail Iliescu, Shigeru Ishimoto, Kenta Itahashi, Masashiko Iwasaki, Keisuke Kuwabara, Yue Ma, Johann Marton, Hirofumi Noda, Galen C. O'Neil, Shinji Okada, Haruhiko Outa, Carl D. Reintsema, Masaharu Sato, Daniel R. Schmidt, Hexi Shi, Ken Suzuki, Takatoshi Suzuki, Jens Uhlig, Joel N. Ullom, Eberhard Widmann, Shinya Yamada, Johann Zmeskal, Daniel S. Swetz


A performance evaluation of superconducting transition-edge sensors (TESs) in the environment of a pion beam line at a particle accelerator is presented. Averaged across the 209 functioning sensors in the array, the achieved energy resolution is 5.2 eV FWHM at Co Kα (6.9 keV) when the pion beam is off and 7.3 eV at a beam intensity of 1.45 MHz. Absolute energy uncertainty of ±0.04 eV is demonstrated for Fe Kα (6.4 keV) with in-situ energy calibration obtained from other nearby known x-ray lines. To achieve this small uncertainty, it is essential to consider the non-Gaussian energy response of the TESs and thermal cross-talk pile-up effects that are due to charged-particle hits in the silicon substrate of the TES array.
Journal of Low Temperature Physics


Transition-edge sensor, Hadronic atom, X-ray spectroscopy, X-ray energy calibration, X-ray response, Low-energy tail
Created January 19, 2016, Updated November 10, 2018