Common bias readout for TES array on Scanning Transmission Electron Microscope
Common bias readout for TES array on Scanning Transmission Electron Microscope
复制标题
扫描透射电子显微镜上 TES 阵列的通用偏置读数
DOI：
10.1007/s10909-016-1562-4
复制
发表时间：
2016
影响因子：
2
通讯作者：
T.Hara
中科院分区：
文献类型：
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作者：
R.Yamamoto;K.Sakai;K.Maehisa;K.Nagayoshi;T.Hayashi;H.Muramatsu;Y.Nakashima;K.Mitsuda;N.Y.Yamasaki;Y.Takei;M.Hidaka;S.Nagasawa;K.Maehata;T.Hara
过渡边缘传感器（TES）微量热计阵列作为扫描透射电子显微镜系统的X射线传感器正在开发中。该系统的技术挑战是5000计数/秒/阵列的高计数率。我们采用了一个64像素阵列与并行读出。共同SQUID偏置，和共同TES偏置的计划，以减少电线的数量和资源的室温电路。在8通道共偏置读出64个象素阵列时，布线减少率为44%。通过模拟和实验研究了能量分辨率可能的退化。串联连接的偏压波动效应小于并联连接的偏压波动效应。通过简单的计算，可以预计串联时SQUID和TES的公共偏压的涨落分别为和。我们构建了8个SQUID，连接到8个TES输出和一个室温电路的共同偏置读出和实验评估。我们的模拟串扰表明，在500 cps/像素的X射线事件率，串扰将拓宽单色线约0.01%，或约1.5 eV在15 keV。因此，我们的设计目标，10 eV的能量分辨率在0.5-15 keV带应该是可以实现的。
A transition edge sensor (TES) microcalorimeter array as an X-ray sensor for a scanning transmission electron microscope system is being developed. The technical challenge of this system is a high count rate of5000 counts/second/array. We adopted a 64 pixel array with a parallel readout. Common SQUID bias, and common TES bias are planned to reduce the number of wires and the resources of a room temperature circuit. The reduction rate of wires is 44 % when a 64 pixel array is read out by a common bias of 8 channels. The possible degradation of the energy resolution has been investigated by simulations and experiments. The bias fluctuation effects of a series connection are less than those of a parallel connection. Simple calculations expect that the fluctuations of the common SQUID bias and common TES bias in a series connection areand, respectively. We constructed 8 SQUIDs which are connected to 8 TES outputs and a room temperature circuit for common bias readout and evaluated experimentally. Our simulation of crosstalk indicates that at an X-ray event rate of 500 cps/pixel, crosstalk will broaden a monochromatic line by about 0.01 %, or about 1.5 eV at 15 keV. Thus, our design goal of 10 eV energy resolution across the 0.5–15 keV band should be achievable.