Performance of a bridge-type TES microcalorimeter, excess noise characteristics and dependence of sensitivity on current
Performance of a bridge-type TES microcalorimeter, excess noise characteristics and dependence of sensitivity on current
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DOI：
10.1016/j.nima.2003.12.025
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发表时间：
2004-05
影响因子：
1.4
通讯作者：
Y. Takei;Keiichi Tanaka;R. Fujimoto;Y. Ishisaki;U. Morita;T. Morooka;T. Oshima;K. Futamoto;T. Hiroike;T. Koga;K. Mitsuda;T. Ohashi;N. Yamasaki;N. Iyomoto;T. Ichitsubo;Kosuke Sato;T. Fujimori;K. Shinozaki;S. Nakayama;K. Chinone
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文献类型：
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作者：
Y. Takei;Keiichi Tanaka;R. Fujimoto;Y. Ishisaki;U. Morita;T. Morooka;T. Oshima;K. Futamoto;T. Hiroike;T. Koga;K. Mitsuda;T. Ohashi;N. Yamasaki;N. Iyomoto;T. Ichitsubo;Kosuke Sato;T. Fujimori;K. Shinozaki;S. Nakayama;K. Chinone
充分利用强电热反馈的优势，我们的电桥式Ti/Au过渡边缘传感器（TES）微热计在5.9 keV下获得了6.6 eV （FWHM）的能量分辨率和74 μs的快速响应时间。该器件的能量分辨率受到大于本振噪声和读出噪声的限制。该噪声仅在通过TES的电流较大（约10 μA）时出现，其电平（定义为通过TES的电流的波动幅度）与TES电阻成反比。我们还发现TES的灵敏度取决于通过TES的电流，并与TES的临界电流归一化。当电流超过临界电流的1%左右时，TES的灵敏度明显下降。在不同TES尺寸和厚度的器件中，临界电流与TES灵敏度明显相关，因此与最佳工作点的信噪比相关。因此，临界电流是决定TES微热量计性能的关键参数之一。
Fully utilizing the benefit of strong electrothermal feedback, we achieved the energy resolution of 6.6 eV (FWHM) at 5.9 keV and a fast response time of 74 μs with our bridge-type Ti/Au transition-edge sensor (TES) microcalorimeter. The energy resolution of this device was limited by a noise that was larger than the intrinsic noise and the readout noise. This noise only appeared when the current through the TES was large (≳10 μA ) , and its level, defined as a fluctuation amplitude of the current through the TES, was in proportion to the inverse of the TES resistance. We also found that the TES sensitivity depended on the current through the TES, normalized with the critical current of the TES. When the current exceeded about 1% of the critical current, the TES sensitivity was significantly degraded. The critical current clearly correlated with the TES sensitivity, and hence the signal-to-noise ratio at the optimal operating point, among devices with different TES size and thickness. Thus, the critical current is one of the key parameters to determine the performance of the TES microcalorimeter.