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Title: Performance of a MICROMEGAS-based TPC in a high-energy neutron beam

The MICROMEGAS (MICRO-MEsh GAseous Structure) charge amplification structure has found wide use in many detection applications, especially as a gain stage for the charge readout of Time Projection Chambers (TPCs). We report on the behavior of a MICROMEGAS TPC when operated in a high-energy (up to 800 MeV) neutron beam. It is found that neutron-induced reactions can cause discharges in some drift gas mixtures that are stable in the absence of the neutron beam. The discharges result from recoil ions close to the MICROMEGAS that deposit high specific ionization density and have a limited diffusion time. And for a binary drift gas, increasing the percentage of the molecular component (quench gas) relative to the noble component and operating at lower pressures generally improves stability.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [1] ;  [4] ;  [1] ;  [2] ;  [4] ;  [3] ;  [1] ;  [1] ;  [3] ;  [3] ;  [5] ;  [6] ;  [7] ;  [2] ;  [6] ;  [1] more »;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [5] ;  [1] ;  [5] ;  [6] ;  [1] « less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Colorado School of Mines, Golden, CO (United States)
  4. Univ. of California, Davis, CA (United States). Dept. of Physics
  5. Abilene Christian Univ., TX (United States)
  6. Oregon State Univ., Corvallis, OR (United States)
  7. California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-722401
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396; NA0002921
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: 881; Journal Issue: C; Journal ID: ISSN 0168-9002
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 43 PARTICLE ACCELERATORS; time projection chamber; TPC; MICROMEGAS; neutron beam
OSTI Identifier:
1414355