Impedance Measurement of a Gamma-Ray TES Calorimeter with a Bulk Sn Absorber.

Authors :: Akamatsu, H.
Ishisaki, Y.
Hoshino, A.
Ezoe, Y.
Ohashi, T.
Takei, Y.
Yamasaki, N. Y.
Mitsuda, K.
Oshima, T.
Tanaka, K.
Source :: AIP Conference Proceedings. 12/16/2009, Vol. 1185 Issue 1, p191-194. 4p.
Publication Year :: 2009
Abstract: We performed complex impedance measurements with a Ti/Au-based gamma-ray TES calorimeter with a bulk Sn absorber. Excellent energy resolution of 38.4±0.9eV at 60 keV was observed. The impedance of the calorimeter can be well explained by a two-body thermal model. We investigated the behavior of the parameters of the calorimeter during the superconducting-to-normal transition. We confirmed that C and Ga are in good agreement with the predicted values. We performed a noise analysis and found several excess noise components, as well as internal thermal fluctuation noise (ITFN) term due to the thermal conductance between the Sn absorber and the Ti/Au TES. Dominanting the noise is an excess noise having a similar frequency dependence to the phonon noise and the ITFN noise. [ABSTRACT FROM AUTHOR]