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Optimization of Time- and Code-Division-Multi-plexed Readout for Athena X-IFU
IEEE Transactions on Applied Superconductivity ( IF 1.7 ) Pub Date : 2019-08-01 , DOI: 10.1109/tasc.2019.2905577
W B Doriese 1 , S R Bandler 2 , S Chaudhuri 3 , C S Dawson 3 , E V Denison 1 , S M Duff 1 , M Durkin 1 , C T FitzGerald 4 , J W Fowler 1 , J D Gard 1 , G C Hilton 1 , K D Irwin 3 , Y I Joe 1 , K M Morgan 1 , G C O'Neil 1 , C G Pappas 1 , C D Reintsema 1 , D A Rudman 1 , S J Smith 2 , R W Stevens 1 , D S Swetz 1 , P Szypryt 1 , J N Ullom 1 , L R Vale 1 , J C Weber 1 , B A Young 3
Affiliation  

Readout of a large, spacecraft-based array of superconducting transition-edge sensors (TESs) requires careful management of the layout area and power dissipation of the cryogenic-circuit components. We present three optimizations of our time- (TDM) and code-division-multiplexing (CDM) systems for the X-ray integral field unit (X-IFU), a several-thousand-pixel-TES array for the planned Athena-satellite mission. The first optimization is a new readout scheme that is a hybrid of CDM and TDM. This C/TDM architecture balances CDM's noise advantage with TDM's layout compactness. The second is a redesign of a component: the shunt resistor that provides a dc-voltage bias to the TESs. A new layout and a thicker Pd-Au resistive layer combine to reduce this resistor's area by more than a factor of 5. Third, we have studied the power dissipated by the first-stage superconducting quantum-interference devices (SQUIDs) and the readout noise versus the critical current of the first-stage SQUIDs. As a result, the X-IFU TDM and C/TDM SQUIDs will have a specified junction critical current of 5 μA. Based on these design optimizations and TDM experiments described by Durkin et al. (these proceedings), TDM meets all requirements to be X-IFU's backup-readout option. Hybrid C/TDM is another viable option that could save spacecraft resources.

中文翻译:

优化 Athena X-IFU 的时分和码分复用读数

读取基于航天器的大型超导过渡边缘传感器 (TES) 阵列需要仔细管理布局区域和低温电路组件的功耗。我们为 X 射线积分场单元 (X-IFU) 提出了我们的时间 (TDM) 和码分复用 (CDM) 系统的三种优化,这是一个用于计划中的雅典娜卫星的数千像素 TES 阵列使命。第一个优化是一种新的读出方案,它是 CDM 和 TDM 的混合体。这种 C/TDM 架构平衡了 CDM 的噪声优势和 TDM 的布局紧凑性。第二个是重新设计一个组件:为 TES 提供直流电压偏置的分流电阻器。新布局和更厚的 Pd-Au 电阻层相结合,将该电阻器的面积减少了 5 倍以上。第三,我们研究了第一级超导量子干涉器件 (SQUID) 的功耗以及读出噪声与第一级 SQUID 的临界电流的关系。因此,X-IFU TDM 和 C/TDM SQUID 的指定结临界电流为 5 μA。基于 Durkin 等人描述的这些设计优化和 TDM 实验。(这些程序),TDM 满足成为 X-IFU 的备份读出选项的所有要求。混合 C/TDM 是另一种可以节省航天器资源的可行选择。基于 Durkin 等人描述的这些设计优化和 TDM 实验。(这些程序),TDM 满足成为 X-IFU 的备份读出选项的所有要求。混合 C/TDM 是另一种可以节省航天器资源的可行选择。基于 Durkin 等人描述的这些设计优化和 TDM 实验。(这些程序),TDM 满足成为 X-IFU 的备份读出选项的所有要求。混合 C/TDM 是另一种可以节省航天器资源的可行选择。
更新日期:2019-08-01
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