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Title: Study of light backgrounds from relativistic electrons in air light-guides

Abstract

The MOLLER experiment proposed at the Thomas Jefferson National Accelerator Facility plans a precision low energy determination of the weak mixing angle via the measurement of the parity-violating asymmetry in the scattering of high energy longitudinally polarized electrons from electrons bound in a liquid hydrogen target (Moller scattering). A relative measure of the scattering rate is planned to be obtained by intercepting the Moller scattered electrons with a circular array of thin fused silica tiles attached to air light guides, which facilitate the transport of Cherenkov photons generated within the tiles to photomultiplier tubes (PMTs). The scattered flux will also pass through the light guides of downstream tiles, generating additional Cherenkov as well as scintillation light and is a potential background. In order to estimate the rate of these backgrounds, a gas-filled tube detector was designed and deployed in an electron beam at the MAMI facility at Johannes Gutenberg University, Mainz, Germany. Described in this paper is the design of a detector to measure separately the scintillation and Cherenkov responses of gas mixtures from relativistic electrons, the results of studies of several gas mixtures with comparisons to simulations, and conclusions about the implications for the design of the MOLLER detectormore » apparatus.« less

Authors:
 [1];  [2];  [3];  [3];  [2];  [2];  [2];  [4];  [3];  [3];  [2];  [5];  [6];  [4];  [2];  [4];  [7];  [4];  [2];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Stony Brook Univ., NY (United States)
  2. Stony Brook Univ., NY (United States)
  3. Johannes Gutenberg Univ., Mainz (Germany)
  4. Univ. of Manitoba, Winnipeg, MB (Canada)
  5. Johannes Gutenberg Univ., Mainz (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  6. Idaho State Univ., Pocatello, ID (United States)
  7. Syracuse Univ., NY (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1465746
Alternate Identifier(s):
OSTI ID: 1548432
Grant/Contract Number:  
[AC02-06CH11357]
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
[ Journal Volume: 896; Journal Issue: C]; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Riordan, S., Zhao, Y. X., Baunack, S., Becker, D., Clarke, C., Dehmelt, K., Deshpande, A., Gericke, M., Gläser, B., Imai, K., Kutz, T., Maas, F. E., McNulty, D., Pan, J., Park, S., Rahman, S., Souder, P. A., Wang, P., Wellman, B., and Kumar, K. S. Study of light backgrounds from relativistic electrons in air light-guides. United States: N. p., 2018. Web. doi:10.1016/j.nima.2018.04.029.
Riordan, S., Zhao, Y. X., Baunack, S., Becker, D., Clarke, C., Dehmelt, K., Deshpande, A., Gericke, M., Gläser, B., Imai, K., Kutz, T., Maas, F. E., McNulty, D., Pan, J., Park, S., Rahman, S., Souder, P. A., Wang, P., Wellman, B., & Kumar, K. S. Study of light backgrounds from relativistic electrons in air light-guides. United States. doi:10.1016/j.nima.2018.04.029.
Riordan, S., Zhao, Y. X., Baunack, S., Becker, D., Clarke, C., Dehmelt, K., Deshpande, A., Gericke, M., Gläser, B., Imai, K., Kutz, T., Maas, F. E., McNulty, D., Pan, J., Park, S., Rahman, S., Souder, P. A., Wang, P., Wellman, B., and Kumar, K. S. Sun . "Study of light backgrounds from relativistic electrons in air light-guides". United States. doi:10.1016/j.nima.2018.04.029. https://www.osti.gov/servlets/purl/1465746.
@article{osti_1465746,
title = {Study of light backgrounds from relativistic electrons in air light-guides},
author = {Riordan, S. and Zhao, Y. X. and Baunack, S. and Becker, D. and Clarke, C. and Dehmelt, K. and Deshpande, A. and Gericke, M. and Gläser, B. and Imai, K. and Kutz, T. and Maas, F. E. and McNulty, D. and Pan, J. and Park, S. and Rahman, S. and Souder, P. A. and Wang, P. and Wellman, B. and Kumar, K. S.},
abstractNote = {The MOLLER experiment proposed at the Thomas Jefferson National Accelerator Facility plans a precision low energy determination of the weak mixing angle via the measurement of the parity-violating asymmetry in the scattering of high energy longitudinally polarized electrons from electrons bound in a liquid hydrogen target (Moller scattering). A relative measure of the scattering rate is planned to be obtained by intercepting the Moller scattered electrons with a circular array of thin fused silica tiles attached to air light guides, which facilitate the transport of Cherenkov photons generated within the tiles to photomultiplier tubes (PMTs). The scattered flux will also pass through the light guides of downstream tiles, generating additional Cherenkov as well as scintillation light and is a potential background. In order to estimate the rate of these backgrounds, a gas-filled tube detector was designed and deployed in an electron beam at the MAMI facility at Johannes Gutenberg University, Mainz, Germany. Described in this paper is the design of a detector to measure separately the scintillation and Cherenkov responses of gas mixtures from relativistic electrons, the results of studies of several gas mixtures with comparisons to simulations, and conclusions about the implications for the design of the MOLLER detector apparatus.},
doi = {10.1016/j.nima.2018.04.029},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = [C],
volume = [896],
place = {United States},
year = {2018},
month = {4}
}

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