Superconducting LC Filter Circuits for Frequency Division Multiplexed Readout of TES Detectors
Superconducting LC Filter Circuits for Frequency Division Multiplexed Readout of TES Detectors
复制标题
用于 TES 探测器频分复用读出的超导 LC 滤波器电路
DOI：
10.1109/tasc.2010.2088357
复制
发表时间：
2011
影响因子：
1.8
通讯作者：
J. van der Kuur
中科院分区：
文献类型：
--
作者：
M. Bruijn;L. Gottardi;R. den Hartog;H. Hoevers;P. D. de Korte;J. van der Kuur
在频分复用的情况下，电感-电容（LC）滤波器电路形成TES探测器的读出链的重要组件。它们的功能是阻挡来自相邻像素的宽带噪声和分离偏置频率。关键要求是高品质因数Q（窄带谐振）以保证TES检测器的电压偏置，这意味着全超导电路、低介电损耗电容器和低磁损耗电感器。通常，Q应大于500*f [MHz]*L [μH]。这里，f是偏置频率，L是电感值，其耦合到检测器速度以获得稳定的电热反馈响应。在我们的例子中，Q必须在1000到10000的范围内。正在开发这些滤光器的天文学应用是IXO-使命上XMS仪器的微量热计读数和日本使命SPICA上SAFARI仪器的远红外辐射热计。对于后者的使命的目标是读出160 TES像素与一个SQUID在频率范围1至2 MHz。我们描述了完全超导电路的制造程序，导致在一个最大的观察Q为12000的a-Si基电容器。我们还报告的努力，以尽量减少所需的表面积的过滤器，并提高过滤器的中心频率的可预测性。我们展示了在原型16通道FDM读出设置中对滤波器的测量。
Inductor-Capacitor (LC) filter circuits form an essential component for the readout chain of TES detectors, in the case of frequency division multiplexing. They serve the functions of blocking wide band noise from adjacent pixels and separation of bias frequencies. A key requirement is a high quality factor Q (narrow band resonance) to guarantee voltage bias of the TES detectors, implying a full superconducting circuit, low dielectric loss capacitors and low magnetic loss inductors. Typically, Q should be larger than 500*f [MHz]*L [μH]. Here f is the bias frequency and L the inductor value, which is coupled to the detector speed for stable electro thermal feedback response. In our case, Q must be in the range of 1000 to 10000. The astronomical applications for which these filters are being developed are the micro calorimeter read-out of the XMS instrument on the IXO-mission and far infrared bolometers for the SAFARI instrument on the Japanese mission SPICA. For the latter mission the goal is to readout 160 TES pixels with one SQUID in the frequency range 1 to 2 MHz. We describe fabrication procedures for fully superconducting circuits, resulting in a maximum observed Q of 12000 for a-Si based capacitors. We also report on efforts to minimize the required surface area for the filters and to improve the predictability of the center frequency of the filters. We show measurements on filters in a prototype 16 channel FDM readout setup.