Characterizing the Sensitivity of 40 GHz TES Bolometers for BICEP Array

C. Zhang, P. A.R. Ade, Z. Ahmed, M. Amiri, D. Barkats, R. Basu Thakur, C. A. Bischoff, J. J. Bock, H. Boenish, E. Bullock, V. Buza, J. Cheshire, J. Connors, J. Cornelison, M. Crumrine, A. Cukierman, M. Dierickx, L. Duband, S. Fatigoni, J. P. FilippiniG. Hall, M. Halpern, S. Harrison, S. Henderson, S. R. Hildebrandt, G. C. Hilton, H. Hui, K. D. Irwin, J. Kang, K. S. Karkare, E. Karpel, S. Kefeli, J. M. Kovac, C. L. Kuo, K. Lau, K. G. Megerian, L. Moncelsi, T. Namikawa, H. T. Nguyen, R. O’Brient, S. Palladino, N. Precup, T. Prouvé, C. Pryke, B. Racine, C. D. Reintsema, S. Richter, A. Schillaci, B. Schmitt, R. Schwarz, C. D. Sheehy, A. Soliman, T. St Germaine, B. Steinbach, R. V. Sudiwala, K. L. Thompson, C. Tucker, A. D. Turner, C. Umiltà, A. G. Vieregg, A. Wandui, A. C. Weber, D. V. Wiebe, J. Willmert, W. L.K. Wu, E. Yang, K. W. Yoon, E. Young, C. Yu

Research output: Contribution to journalArticlepeer-review

Abstract

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 r0.05< 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, Tc, Rn, Psat, and spectral bands, and noise spectra. We achieved a per bolometer NEP including all noise components of 2.07×10-17W/Hz, including an anticipated photon noise level 1.54×10-17W/Hz.

Original languageEnglish (US)
Pages (from-to)968-975
Number of pages8
JournalJournal of Low Temperature Physics
Volume199
Issue number3-4
DOIs
StatePublished - May 1 2020

Keywords

  • B-Mode polarization
  • CMB
  • Cosmology
  • Inflation
  • TES

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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