Measurement of saturated electron extraction efficiency for dual-phase xenon dark matter experiments

ORAL

Abstract

We report a new measurement of the electron extraction efficiency (EEE) from liquid xenon into gaseous xenon in a dual-phase xenon time projection chamber (TPC). By using the L- and K-shell capture lines from 37Ar decays and by developing excellent high voltage capabilities, we measured the relative EEE values at the highest extraction electric field strength reported to date. For the first time, a clear saturation of the EEE is observed for extraction electric fields above 7.5 kV/cm in the liquid; and the EEE stays stable at 3% level up to 10.4 kV/cm. We discuss how the observed saturation may help calibrate the absolute EEE values, and present the implications of this result to current and future xenon-based dark matter searches.

*This project is supported by the U.S. Department of Energy (DOE) Office of Science, Office of High Energy Physics under Work Proposal Number SCW1508 and SCW1077 awarded to Lawrence Livermore National Laboratory (LLNL). D. Naim was supported by the DOE/NNSA under Award Number DE-NA0000979 through the Nuclear Science and Security Consortium.

–

Presenters

  • Jingke Xu

    • Lawrence Livermore Natl Lab

Authors

  • Jingke Xu

    • Lawrence Livermore Natl Lab

  • Sergey Pereverzev

    • Lawrence Livermore Natl Lab

  • Brian G Lenardo

    • University of California, Davis

  • James Kingstron

    • the University of Chicago

  • Daniel Naim

    • University of California, Davis

  • Adam Bernstein

    • Lawrence Livermore Natl Lab

  • Kareem Kazkaz

    • Lawrence Livermore Natl Lab

  • S. Mani Tripathi

    • University of California, Davis