TES imaging array technology for COVER

Michael D. Audley, Robert W. Barker, Michael Crane, Roger Dace, Dorota Glowacka, David J. Goldie, Anthony N. Lasenby, Howard M. Stevenson, Vassilka Tsaneva, Stafford Withington, Paul Grimes, Bradley Johnson, Ghassan Yassin, Lucio Piccirillo, Giampaolo Pisano, William D. Duncan, Gene C. Hilton, Kent D. Irwin, Carl D. Reintsema, Mark Halpern

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    COVER is an experiment which aims to detect the signature of gravitational waves from inflation by measuring the B-mode polarization of the cosmic microwave background. COVER consists of three telescopes operating at 97, 150, and 220 GHz. The 97-GHz telescope has 160 horns in its focal plane while the 150 and 220-GHz telescopes have 256 horns each. The horns are arranged in a hexagonal array and feed a polarimeter which uses finline-coupled TES bolometers as detectors. To detect the two polarizations the 97-GHz telescope has 320 detectors while the 150 and 220-GHz telescopes have 512 detectors each. To achieve the required NEPs the detectors are cooled to 100 mK for the 97 and 150-GHz polarimeters and 230 mK for the 220-GHz polarimeter. Each detector is fabricated as a single chip to guarantee fully functioning focal planes. The detectors are contained in linear modules made of copper which form split-block waveguides. The detector modules contain 16 or 20 detectors each for compatibility with the hexagonal arrays of horns in the telescopes' focal planes. Each detector module contains a time-division SQUID multiplexer to read out the detectors. Further amplification of the multiplexed signals is provided by SQUID series arrays. The first prototype detectors for C OVER operate with a bath temperature of 230 mK and are used to validate the detector design as well as the polarimeter technology. We describe the design of the COVER detectors, detector blocks, and readout, and give an update on the detector development.

    Original languageEnglish
    Title of host publicationMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III
    DOIs
    Publication statusPublished - 2006
    EventMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III - Orlando, FL, United States
    Duration: 29 May 200631 May 2006

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume6275
    ISSN (Print)0277-786X

    Conference

    ConferenceMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III
    Country/TerritoryUnited States
    CityOrlando, FL
    Period29/05/0631/05/06

    Keywords

    • CLOVER
    • CMB polarization
    • Finline transition
    • Microstrip-coupled bolometer
    • Time-domain SQUID multiplexer
    • Transition edge sensor

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