Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys
Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys
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DOI：
10.1007/s10909-018-1920-5
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发表时间：
2017-10
影响因子：
2
通讯作者：
E. Vavagiakis;S. Henderson;K. Zheng;H.-M. Cho;N. Cothard;B. Dober;S. Duff;P. Gallardo;G. Hilton;J. Hubmayr;K. Irwin;B. Koopman;D. Li;F. Nati;M. Niemack;C. Reintsema;S. Simon;J. Stevens;A. Suzuki;B. Westbrook
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文献类型：
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作者：
E. Vavagiakis;S. Henderson;K. Zheng;H.-M. Cho;N. Cothard;B. Dober;S. Duff;P. Gallardo;G. Hilton;J. Hubmayr;K. Irwin;B. Koopman;D. Li;F. Nati;M. Niemack;C. Reintsema;S. Simon;J. Stevens;A. Suzuki;B. Westbrook
在未来十年，新的地面宇宙微波背景（CMB）实验，如西蒙斯天文台，CCAT-prime和CMB-S4，将增加观测CMB的探测器数量，大大提高我们对宇宙学和天体物理学的理解。这些项目将部署多达数十万个过渡边缘传感器（TES）辐射热计的接收器，这些辐射热计耦合到基于超导量子干涉器件（SQUID）的读出系统。众所周知，诸如TESes和SQUID的超导器件对磁场敏感。然而，由于超导转变的复杂行为，磁场对TES的影响不容易预测，这促使直接测量这些设备的磁灵敏度。我们提出了比较四引线测量的临界温度与外加磁场的AlMn TEES的几何形状，掺杂，腿长，包括先进的ACT和POLARBEAR-2/西蒙斯阵列测辐射热计。还测试了MoCu ACTPol TES，发现其对磁场比AlMn器件更敏感。我们提出了一个观察弱链接的行为在铝锰TESes在低临界电流。我们还比较了时分复用SQUID和频分复用微波（MUX）RF-SQUID的磁灵敏度的测量。我们讨论了我们的测量所需的磁屏蔽未来的实验，旨在映射的CMB近基本限制的影响。
In the next decade, new ground-based cosmic microwave background (CMB) experiments such as Simons Observatory, CCAT-prime, and CMB-S4 will increase the number of detectors observing the CMB by an order of magnitude or more, dramatically improving our understanding of cosmology and astrophysics. These projects will deploy receivers with as many as hundreds of thousands of transition edge sensor (TES) bolometers coupled to superconducting quantum interference device (SQUID)-based readout systems. It is well known that superconducting devices such as TESes and SQUIDs are sensitive to magnetic fields. However, the effects of magnetic fields on TESes are not easily predicted due to the complex behavior of the superconducting transition, which motivates direct measurements of the magnetic sensitivity of these devices. We present comparative four-lead measurements of the critical temperature versus applied magnetic field of AlMn TESes varying in geometry, doping, and leg length, including Advanced ACT and POLARBEAR-2/Simons Array bolometers. MoCu ACTPol TESes are also tested and are found to be more sensitive to magnetic fields than the AlMn devices. We present an observation of weak-link-like behavior in AlMn TESes at low critical currents. We also compare measurements of magnetic sensitivity for time division multiplexing SQUIDs and frequency division multiplexing microwave (MUX) rf-SQUIDs. We discuss the implications of our measurements on the magnetic shielding required for future experiments that aim to map the CMB to near-fundamental limits.