Advanced ACTPol Low-Frequency Array: Readout and Characterization of Prototype 27 and 39 GHz Transition Edge Sensors

Koopman, B. J.; Cothard, N. F.; Choi, S. K.; Crowley, K. T.; Duff, S. M.; Henderson, S. W.; Ho, S. P.; Hubmayr, J.; Gallardo, P. A.; Nati, F.; Niemack, M. D.; Simon, S. M.; Staggs, S. T.; Stevens, J. R.; Vavagiakis, E. M.; Wollack, E. J.

doi:10.1007/s10909-018-1957-5

Title: Advanced ACTPol Low-Frequency Array: Readout and Characterization of Prototype 27 and 39 GHz Transition Edge Sensors

Journal Article · 11 May 2018 · Journal of Low Temperature Physics

DOI: https://doi.org/10.1007/s10909-018-1957-5 · OSTI ID:1490482

^[1]; Cothard, N. F. ^[2]; Choi, S. K. ^[3]; Crowley, K. T. ^[3]; Duff, S. M. ^[4]; Henderson, S. W. ^[5]; Ho, S. P. ^[3]; Hubmayr, J. ^[4]; Gallardo, P. A. ^[1]; Nati, F. ^[6]; Niemack, M. D. ^[1]; Simon, S. M. ^[7]; Staggs, S. T. ^[3]; Stevens, J. R. ^[1]; Vavagiakis, E. M. ^[1]; Wollack, E. J. ^[8]

Cornell Univ., Ithaca, NY (United States). Dept of Physics
Cornell Univ., Ithaca, NY (United States). Dept. of Applied and Engineering Physics
Princeton Univ., NJ (United States). Joseph Henry Lab. of Physics
National Inst. of Standards and Technology (NIST), Boulder, CO (United States). Quantum Devices Group
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Physics and Astronomy
Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Physics
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)

Advanced ACTPol (AdvACT) is a third-generation polarization upgrade to the Atacama Cosmology Telescope, designed to observe the cosmic microwave background (CMB). AdvACT expands on the 90 and 150 GHz transition edge sensor (TES) bolometer arrays of the ACT Polarimeter (ACTPol), adding both high-frequency (HF, 150/230 GHz) and low-frequency (LF, 27/39 GHz) multichroic arrays. The addition of the high- and low-frequency detectors allows for the characterization of synchrotron and spinning dust emission at the low frequencies and foreground emission from galactic dust and dusty star-forming galaxies at the high frequencies. The increased spectral coverage of AdvACT will enable a wide range of CMB science, such as improving constraints on dark energy, the sum of the neutrino masses, and the existence of primordial gravitational waves. The LF array will be the final AdvACT array, replacing one of the MF arrays for a single season. Prior to the fabrication of the final LF detector array, we designed and characterized prototype TES bolometers. Detector geometries in these prototypes are varied in order to inform and optimize the bolometer designs for the LF array, which requires significantly lower noise levels and saturation powers (as low as ~1 pW) than the higher-frequency detectors. Here we present results from tests of the first LF prototype TES detectors for AdvACT, including measurements of the saturation power, critical temperature, thermal conductance, and time constants. Finally, we also describe the modifications to the time-division SQUID readout architecture compared to the MF and HF arrays.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; 1440226; NNX13AE56G; NNX14AB58G; NNX13AL53H

OSTI ID:: 1490482

Journal Information:: Journal of Low Temperature Physics, Vol. 193, Issue 5-6; ISSN 0022-2291

Publisher:: Plenum PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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References (12)

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Developing AlMn Films for Argonne TES Fabrication Vavagiakis, E. M.; Cothard, N. F.; Stevens, J. R. Journal of Low Temperature Physics, Vol. 199, Issue 1-2 https://doi.org/10.1007/s10909-019-02281-9	journal	December 2019
The Design of the CCAT-prime Epoch of Reionization Spectrometer Instrument Cothard, N. F.; Choi, S. K.; Duell, C. J. Journal of Low Temperature Physics, Vol. 199, Issue 3-4 https://doi.org/10.1007/s10909-019-02297-1	journal	January 2020
Demonstration of 220/280 GHz Multichroic Feedhorn-Coupled TES Polarimeter Walker, S.; Sierra, C. E.; Austermann, J. E. Journal of Low Temperature Physics, Vol. 199, Issue 3-4 https://doi.org/10.1007/s10909-019-02316-1	journal	January 2020
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