TY - GEN
T1 - Impedance measurement and excess-noise behavior of a Ti/Au bilayer TES calorimeter
AU - Akamatsu, H.
AU - Abe, Y.
AU - Ishikawa, K.
AU - Ishisaki, Y.
AU - Ezoe, Y.
AU - Ohashi, T.
AU - Takei, Y.
AU - Yamasaki, N. Y.
AU - Mitsuda, K.
AU - Maeda, R.
PY - 2009
Y1 - 2009
N2 - To imderstand the so-called excess noise, we measured the complex impedance of a TES microcalorimeter, and derived the hernial sensitivity α, current sensitivity β, and heat capacity C. Making use of the obtained parameters, we found that the excess noise can be represented by two types of extra noise having similar spectra as Johnson and phonon noise. The contribution of the Johnson-like, usually expressed by the M factor, depended on alpha; as M ≃ 0.2-√a, which is consistent with the behavior of the excess noise studied in other groups. Pursuing the better energy resolution, we suppressed the dominant noise components by introducing a Si collimator to irradiate X-rays only to the Au absorber, increasing the ADC resolution, and improving the temperature stability. So far, the energy resolution has been improved from 4.8 eV to 2.8 eV (FWHM).
AB - To imderstand the so-called excess noise, we measured the complex impedance of a TES microcalorimeter, and derived the hernial sensitivity α, current sensitivity β, and heat capacity C. Making use of the obtained parameters, we found that the excess noise can be represented by two types of extra noise having similar spectra as Johnson and phonon noise. The contribution of the Johnson-like, usually expressed by the M factor, depended on alpha; as M ≃ 0.2-√a, which is consistent with the behavior of the excess noise studied in other groups. Pursuing the better energy resolution, we suppressed the dominant noise components by introducing a Si collimator to irradiate X-rays only to the Au absorber, increasing the ADC resolution, and improving the temperature stability. So far, the energy resolution has been improved from 4.8 eV to 2.8 eV (FWHM).
KW - TES microcalorimeter excess-noise
UR - https://www.scopus.com/pages/publications/71049193777
U2 - 10.1063/1.3292313
DO - 10.1063/1.3292313
M3 - 会议稿件
AN - SCOPUS:71049193777
SN - 9780735407510
T3 - AIP Conference Proceedings
SP - 195
EP - 198
BT - Low Temperature Detectors LTD-13 - Proceedings of the 13th International Workshop
T2 - 13th International Workshop on Low Temperature Detectors, LTD-13
Y2 - 20 July 2009 through 24 July 2009
ER -