TY - JOUR
T1 - Frequency-domain multiplexing of TES microcalorimeter array with CABBAGE
AU - Iyomoto, N.
AU - Ichitsubo, T.
AU - Mitsuda, K.
AU - Yamasaki, N. Y.
AU - Fujimoto, R.
AU - Oshima, T.
AU - Futamoto, K.
AU - Takei, Y.
AU - Fujimori, T.
AU - Yoshida, K.
AU - Ishisaki, Y.
AU - Morita, U.
AU - Koga, T.
AU - Shinozaki, K.
AU - Sato, K.
AU - Takai, N.
AU - Ohashi, T.
AU - Miyazaki, T.
AU - Nakayama, S.
AU - Tanaka, K.
AU - Morooka, T.
AU - Chinone, K.
N1 - Funding Information:
This work was supported in part by MEXT/JSPS, Japan (KAKENHI 13440079, 14204017, 14079103).
PY - 2004/3/11
Y1 - 2004/3/11
N2 - Properties of Transition-Edge Sensor (TES) microcalorimeters operated with AC bias are studied utilizing the calorimeter Wheatstone bridge circuit called Calorimeter Bridge Biased by an AC Generator (CABBAGE). The CABBAGE eliminates the AC carrier significantly, thus enables us to study the AC responses of the TES with high sensitivity. We tested two kinds of TES devices operating at 110 and 440 mK, respectively. With the 110 mK device biased with 25 kHz, an energy resolution of 28 eV is obtained for Mn Kα line. On the other hand, we multiplexed the signals from two 440 mK device biased with 50 and 20 kHz, respectively, and obtained 167 and 271 eV energy resolutions. Even at the balance point of the bridge, AC signal did not disappear and odd-order harmonics were observed. They are considered to arise from the current dependence of the TES resistance, which is characterized by β = dlogR/dlogI. Numerical solution for the CABBAGE response can reproduce the experimental results well if β = 0.24±0.02. Since the harmonics may cause severe problem in the SQUID operation even after attenuated by a band-pass filter, especially at high bias frequency operation such as several hundred kHz, it is important to make β small.
AB - Properties of Transition-Edge Sensor (TES) microcalorimeters operated with AC bias are studied utilizing the calorimeter Wheatstone bridge circuit called Calorimeter Bridge Biased by an AC Generator (CABBAGE). The CABBAGE eliminates the AC carrier significantly, thus enables us to study the AC responses of the TES with high sensitivity. We tested two kinds of TES devices operating at 110 and 440 mK, respectively. With the 110 mK device biased with 25 kHz, an energy resolution of 28 eV is obtained for Mn Kα line. On the other hand, we multiplexed the signals from two 440 mK device biased with 50 and 20 kHz, respectively, and obtained 167 and 271 eV energy resolutions. Even at the balance point of the bridge, AC signal did not disappear and odd-order harmonics were observed. They are considered to arise from the current dependence of the TES resistance, which is characterized by β = dlogR/dlogI. Numerical solution for the CABBAGE response can reproduce the experimental results well if β = 0.24±0.02. Since the harmonics may cause severe problem in the SQUID operation even after attenuated by a band-pass filter, especially at high bias frequency operation such as several hundred kHz, it is important to make β small.
KW - Microcalorimeter
KW - Multiplex
KW - Superconducting
KW - TES
KW - X-ray
UR - http://www.scopus.com/inward/record.url?scp=12144291168&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=12144291168&partnerID=8YFLogxK
U2 - 10.1016/j.nima.2003.11.316
DO - 10.1016/j.nima.2003.11.316
M3 - Article
AN - SCOPUS:12144291168
SN - 0168-9002
VL - 520
SP - 566
EP - 569
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
IS - 1-3
ER -