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Title: Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys

Abstract

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 (mMUX)more » 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.« less

Authors:
 [1];  [1];  [1];  [2];  [1];  [3];  [4];  [1];  [4];  [4];  [5];  [1];  [2];  [6];  [1];  [3];  [7];  [1];  [8];  [9]
  1. Cornell Univ., Ithaca, NY (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. National Inst. of Standards and Technology (NIST), Boulder, CO (United States). Quantum Devices Group
  4. National Inst. of Standards and Technology (NIST), Boulder, CO (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)
  6. Univ. of Pennsylvania, Philadelphia, PA (United States)
  7. Univ. of Michigan, Ann Arbor, MI (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  9. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490486
Grant/Contract Number:  
AC02-76SF00515; DGE-1650441; AST-1454881
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Low Temperature Physics
Additional Journal Information:
Journal Volume: 193; Journal Issue: 3-4; Journal ID: ISSN 0022-2291
Publisher:
Plenum Press
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Superconducting detectors; Transition edge sensors; Bolometers; SQUIDs; Weak link; Proximity effect; Magnetic field dependence

Citation Formats

Vavagiakis, E. M., Henderson, S. W., Zheng, K., Cho, H. -M., Cothard, N. F., Dober, B., Duff, S. M., Gallardo, P. A., Hilton, G., Hubmayr, J., Irwin, K. D., Koopman, B. J., Li, D., Nati, F., Niemack, M. D., Reintsema, C. D., Simon, S., Stevens, J. R., Suzuki, A., and Westbrook, B. Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys. United States: N. p., 2018. Web. doi:10.1007/s10909-018-1920-5.
Vavagiakis, E. M., Henderson, S. W., Zheng, K., Cho, H. -M., Cothard, N. F., Dober, B., Duff, S. M., Gallardo, P. A., Hilton, G., Hubmayr, J., Irwin, K. D., Koopman, B. J., Li, D., Nati, F., Niemack, M. D., Reintsema, C. D., Simon, S., Stevens, J. R., Suzuki, A., & Westbrook, B. Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys. United States. doi:10.1007/s10909-018-1920-5.
Vavagiakis, E. M., Henderson, S. W., Zheng, K., Cho, H. -M., Cothard, N. F., Dober, B., Duff, S. M., Gallardo, P. A., Hilton, G., Hubmayr, J., Irwin, K. D., Koopman, B. J., Li, D., Nati, F., Niemack, M. D., Reintsema, C. D., Simon, S., Stevens, J. R., Suzuki, A., and Westbrook, B. Thu . "Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys". United States. doi:10.1007/s10909-018-1920-5. https://www.osti.gov/servlets/purl/1490486.
@article{osti_1490486,
title = {Magnetic Sensitivity of AlMn TESes and Shielding Considerations for Next-Generation CMB Surveys},
author = {Vavagiakis, E. M. and Henderson, S. W. and Zheng, K. and Cho, H. -M. and Cothard, N. F. and Dober, B. and Duff, S. M. and Gallardo, P. A. and Hilton, G. and Hubmayr, J. and Irwin, K. D. and Koopman, B. J. and Li, D. and Nati, F. and Niemack, M. D. and Reintsema, C. D. and Simon, S. and Stevens, J. R. and Suzuki, A. and Westbrook, B.},
abstractNote = {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 (mMUX) 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.},
doi = {10.1007/s10909-018-1920-5},
journal = {Journal of Low Temperature Physics},
number = 3-4,
volume = 193,
place = {United States},
year = {2018},
month = {5}
}

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