Antenna-coupled TES bolometers used in BICEP2, Keck Array, and Spider
- School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA (United Kingdom)
- Department of Physics, California Institute of Technology, Pasadena, CA 91125 (United States)
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC (Canada)
- Joint ALMA Observatory, ESO, Santiago (Chile)
- Department of Physics, University of Toronto, Toronto, ON (Canada)
- Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS 42, Cambridge, MA 02138 (United States)
- Jet Propulsion Laboratory, Pasadena, CA 91109 (United States)
- Minnesota Institute for Astrophysics, University of Minnesota, Minneapolis, MN 55455 (United States)
- Université Grenoble Alpes, CEA INAC-SBT, F-38000 Grenoble (France)
We have developed antenna-coupled transition-edge sensor bolometers for a wide range of cosmic microwave background (CMB) polarimetry experiments, including Bicep2, Keck Array, and the balloon borne Spider. These detectors have reached maturity and this paper reports on their design principles, overall performance, and key challenges associated with design and production. Our detector arrays repeatedly produce spectral bands with 20%–30% bandwidth at 95, 150, or 230 GHz. The integrated antenna arrays synthesize symmetric co-aligned beams with controlled side-lobe levels. Cross-polarized response on boresight is typically ∼0.5%, consistent with cross-talk in our multiplexed readout system. End-to-end optical efficiencies in our cameras are routinely 35% or higher, with per detector sensitivities of NET ∼ 300 μK{sub CMB}√s. Thanks to the scalability of this design, we have deployed 2560 detectors as 1280 matched pairs in Keck Array with a combined instantaneous sensitivity of ∼9 μK{sub CMB}√s, as measured directly from CMB maps in the 2013 season. Similar arrays have recently flown in the Spider instrument, and development of this technology is ongoing.
- OSTI ID:
- 22887131
- Journal Information:
- Astrophysical Journal, Vol. 812, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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