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Title: Two distinct components of the delayed single electron noise in liquid xenon emission detectors

Journal Article · · Journal of Instrumentation
 [1];  [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Physics

Single electron noise which persists for many milliseconds is known to follow ionizing events in liquid/gas xenon emission detectors. Due to the long timescale, this noise can be mistaken for a genuine signal. Therefore, it is a limiting background to the low-energy threshold of dark matter searches, and could prevent discovery-class searches for MeV scale hidden sector dark matter. A systematic study reveals distinct fast and slow components to the noise. The fast component is compatible with the hypothesis of electrons which were trapped below the liquid surface, and can be reduced by increasing the electric field across the liquid/gas interface. However, the slow component increases linearly with electric field. Hypotheses for the origin of this effect are discussed, and techniques for mitigation are suggested.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1485080
Journal Information:
Journal of Instrumentation, Journal Name: Journal of Instrumentation Journal Issue: 02 Vol. 13; ISSN 1748-0221
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English

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Saturated overburden scattering and the multiscatter frontier: Discovering dark matter at the Planck mass and beyond journal October 2018
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Dark Matter Search Results from a One Ton-Year Exposure of XENON1T journal September 2018
Low-Energy Physics Reach of Xenon Detectors for Nuclear-Recoil-Based Dark Matter and Neutrino Experiments journal December 2019
Light Dark Matter Search with Ionization Signals in XENON1T journal December 2019
Saturated Overburden Scattering and the Multiscatter Frontier: Discovering Dark Matter at the Planck Mass and Beyond text January 2018
Electron extraction efficiency study for dual-phase xenon dark matter experiments text January 2019
Light Dark Matter Search with Ionization Signals in XENON1T text January 2019
Dark Matter Search Results from a One Ton-Year Exposure of XENON1T text January 2018
Light Dark Matter Search with Ionization Signals in XENON1T text January 2019