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Characterizing the Sensitivity of 40 GHz TES Bolometers for BICEP Array

Zhang, C. and Ade, P. A. R. and Ahmed, Z. and Amiri, M. and Barkats, D. and Thakur, R. Basu and Bischoff, C. A. and Bock, J. J. and Boenish, H. and Bullock, E. and Buza, V. and Cheshire, J. and Connors, J. and Cornelison, J. and Crumrine, M. and Cukierman, A. and Dierickx, M. and Duband, L. and Fatigoni, S. and Filippini, J. P. and Hall, G. and Halpern, M. and Harrison, S. and Henderson, S. and Hildebrandt, S. R. and Hilton, G. C. and Hui, H. and Irwin, K. D. and Kang, J. and Karkare, K. S. and Karpel, E. and Kefeli, S. and Kovac, J. M. and Kuo, C. L. and Lau, K. and Megerian, K. G. and Moncelsi, L. and Namikawa, T. and Nguyen, H. T. and O’Brient, R. and Palladino, S. and Precup, N. and Prouvé, T. and Pryke, C. and Racine, B. and Reintsema, C. D. and Richter, S. and Schillaci, A. and Schmitt, B. and Schwarz, R. and Sheehy, C. D. and Soliman, A. and Germaine, T. St. and Steinbach, B. and Sudiwala, R. V. and Thompson, K. L. and Tucker, C. and Turner, A. D. and Umiltà, C. and Vieregg, A. G. and Wandui, A. and Weber, A. C. and Wiebe, D. V. and Willmert, J. and Wu, W. L. K. and Yang, E. and Yoon, K. W. and Young, E. and Yu, C. (2020) Characterizing the Sensitivity of 40 GHz TES Bolometers for BICEP Array. Journal of Low Temperature Physics, 199 (3-4). pp. 968-975. ISSN 0022-2291.

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The BICEP/Keck (BK) experiment aims to detect the imprint of primordial gravitational waves in the cosmic microwave background polarization, which would be direct evidence of the inflation theory. While the tensor-to-scalar ratio has been constrained to be r_(0.05) < 0.06 at 95% c.l., further improvements on this upper limit are hindered by polarized galactic foreground emissions and removal of gravitational lensing polarization. The 30/40 GHz receiver of the BICEP Array (BA) will deploy at the end of 2019 and will constrain the synchrotron foreground with unprecedented accuracy within the BK sky patch. We will show the design of the 30/40 GHz detectors and test results summarizing its performance. The low optical and atmospheric loading at these frequencies requires our TES detectors to have low saturation power in order to be photon noise dominated. To realize the low thermal conductivity required from a 250 mK base temperature, we developed new bolometer leg designs. We will present the relevant measured detector parameters: G, T_c, R_n, P_(sat), and spectral bands, and noise spectra. We achieved a per bolometer NEP including all noise components of 2.07×10⁻¹⁷ W/√Hz, including an anticipated photon noise level 1.54×10⁻¹⁷W/√Hz.

Item Type:Article
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Zhang, C.0000-0001-8288-5823
Bock, J. J.0000-0002-5710-5212
Moncelsi, L.0000-0002-4242-3015
Additional Information:© 2020 Springer Nature Switzerland AG. Received 01 September 2019; Accepted 10 February 2020; Published 24 February 2020. The BICEP/Keck project have been made possible through a series of grants from the National Science Foundation including 0742818, 0742592, 1044978, 1110087, 1145172, 1145143, 1145248, 1639040, 1638957, 1638978, 1638970, and 1726917 and by the Keck Foundation. The development of antenna-coupled detector technology was supported by the JPL Research and Technology Development Fund and NASA Grants 06-ARPA206-0040, 10-SAT10-0017, 12-SAT12-0031, 14-SAT14-0009 and 16-SAT16-0002. The development and testing of focal planes were supported by the Gordon and Betty Moore Foundation at Caltech. Readout electronics were supported by a Canada Foundation for Innovation grant to UBC. The computations in this paper were run on the Odyssey cluster supported by the FAS Science Division Research Computing Group at Harvard University. The analysis effort at Stanford and SLAC is partially supported by the U.S. DoE Office of Science. We thank the staff of the U.S. Antarctic Program and in particular the South Pole Station without whose help this research would not have been possible. Tireless administrative support was provided by Kathy Deniston, Sheri Stoll, Irene Coyle, Donna Hernandez, and Dana Volponi.
Group:Astronomy Department
Funding AgencyGrant Number
W. M. Keck FoundationUNSPECIFIED
JPL Research and Technology Development FundUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Harvard UniversityUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:Cosmology; B-Mode polarization; Inflation; CMB; TES
Issue or Number:3-4
Record Number:CaltechAUTHORS:20200225-082326440
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Official Citation:Zhang, C., Ade, P.A.R., Ahmed, Z. et al. Characterizing the Sensitivity of 40 GHz TES Bolometers for BICEP Array. J Low Temp Phys 199, 968–975 (2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101522
Deposited By: Tony Diaz
Deposited On:25 Feb 2020 16:42
Last Modified:05 May 2020 21:51

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