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Title: Investigation on the electron flux to the wall in the VENUS ion source

Abstract

The long-term operation of high charge state electron cyclotron resonance ion sources fed with high microwave power has caused damage to the plasma chamber wall in several laboratories. Porosity, or a small hole, can be progressively created in the chamber wall which can destroy the plasma chamber over a few year time scale. Here, a burnout of the VENUS plasma chamber is investigated in which the hole formation in relation to the local hot electron power density is studied. First, the results of a simple model assuming that hot electrons are fully magnetized and strictly following magnetic field lines are presented. The model qualitatively reproduces the experimental traces left by the plasma on the wall. However, it is too crude to reproduce the localized electron power density for creating a hole in the chamber wall. Second, the results of a Monte Carlo simulation, following a population of scattering hot electrons, indicate a localized high power deposited to the chamber wall consistent with the hole formation process. Finally, a hypervapotron cooling scheme is proposed to mitigate the hole formation in electron cyclotron resonance plasma chamber wall.

Authors:
 [1];  [1];  [2];  [2];  [2];  [2];  [2]
+ Show Author Affiliations
  1. Univ. of Grenoble-Alpes, CNRS/IN2P3 (France). Lab. of Subatomic Physics and Cosmology (LPSC)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1456932
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 2; Related Information: © 2015 AIP Publishing LLC.; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 42 ENGINEERING; Monte Carlo methods; electrodes; hot carriers; ion sources; plasma collisions; Venus; plasma temperature; electron scattering; magnetic fields; particle scattering

Citation Formats

Thuillier, T., Angot, J., Benitez, J. Y., Hodgkinson, A., Lyneis, C. M., Todd, D. S., and Xie, D. Z. Investigation on the electron flux to the wall in the VENUS ion source. United States: N. p., 2015. Web. doi:10.1063/1.4935989.
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Thuillier, T., Angot, J., Benitez, J. Y., Hodgkinson, A., Lyneis, C. M., Todd, D. S., & Xie, D. Z. Investigation on the electron flux to the wall in the VENUS ion source. United States. https://doi.org/10.1063/1.4935989
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Thuillier, T., Angot, J., Benitez, J. Y., Hodgkinson, A., Lyneis, C. M., Todd, D. S., and Xie, D. Z. Tue . "Investigation on the electron flux to the wall in the VENUS ion source". United States. https://doi.org/10.1063/1.4935989. https://www.osti.gov/servlets/purl/1456932.
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@article{osti_1456932,
title = {Investigation on the electron flux to the wall in the VENUS ion source},
author = {Thuillier, T. and Angot, J. and Benitez, J. Y. and Hodgkinson, A. and Lyneis, C. M. and Todd, D. S. and Xie, D. Z.},
abstractNote = {The long-term operation of high charge state electron cyclotron resonance ion sources fed with high microwave power has caused damage to the plasma chamber wall in several laboratories. Porosity, or a small hole, can be progressively created in the chamber wall which can destroy the plasma chamber over a few year time scale. Here, a burnout of the VENUS plasma chamber is investigated in which the hole formation in relation to the local hot electron power density is studied. First, the results of a simple model assuming that hot electrons are fully magnetized and strictly following magnetic field lines are presented. The model qualitatively reproduces the experimental traces left by the plasma on the wall. However, it is too crude to reproduce the localized electron power density for creating a hole in the chamber wall. Second, the results of a Monte Carlo simulation, following a population of scattering hot electrons, indicate a localized high power deposited to the chamber wall consistent with the hole formation process. Finally, a hypervapotron cooling scheme is proposed to mitigate the hole formation in electron cyclotron resonance plasma chamber wall.},
doi = {10.1063/1.4935989},
journal = {Review of Scientific Instruments},
number = 2,
volume = 87,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 2015},
month = {Tue Dec 01 00:00:00 EST 2015}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.4935989
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Citation Metrics:
Cited by: 7 works
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Figures / Tables:

FIG. 1. FIG. 1. : Diamonds: Axial magnetic field on axis. Solid and dashed lines: Magnetic field intensity at the wall along two consecutive hexapole magnetic flutes.
All figures and tables (8 total)
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Works referenced in this record:

The third generation superconducting 28 GHz electron cyclotron resonance ion source VENUS (invited)
journal, February 2010

  • Lyneis, C.; Leitner, D.; Leitner, M.
  • Review of Scientific Instruments, Vol. 81, Issue 2
  • DOI: 10.1063/1.3271135

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  • Girard, A.; Perret, C.; Melin, G.
  • Review of Scientific Instruments, Vol. 69, Issue 2
  • DOI: 10.1063/1.1148588

Introduction to Plasma Physics and Controlled Fusion
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Hypervapotron technique in subcooled flow boiling CHF
journal, October 1993

Particle-water heat transfer during explosive volcanic eruptions: VOLCANIC PARTICLE-WATER HEAT TRANSFER
journal, October 2012

  • Woodcock, D. C.; Gilbert, J. S.; Lane, S. J.
  • Journal of Geophysical Research: Solid Earth, Vol. 117, Issue B10
  • DOI: 10.1029/2012JB009240

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  • Industrial & Engineering Chemistry, Vol. 45, Issue 12
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journal, January 1990

  • Melin, G.; Bourg, F.; Briand, P.
  • Review of Scientific Instruments, Vol. 61, Issue 1
  • DOI: 10.1063/1.1141305

Investigation of hot electrons in electron‐cyclotron‐resonance ion sources
journal, September 1994

  • Barué, C.; Lamoureux, M.; Briand, P.
  • Journal of Applied Physics, Vol. 76, Issue 5
  • DOI: 10.1063/1.357563

Performance of Hypervapotron Beam-Stopping Elements at JET
journal, July 1996

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    Works referencing / citing this record:

    Experimental evidence on microwave induced electron losses from ECRIS plasma
    journal, June 2018

    • Sakildien, M.; Tarvainen, O.; Kronholm, R.
    • Physics of Plasmas, Vol. 25, Issue 6
    • DOI: 10.1063/1.5029443
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      Figures / Tables found in this record:

      FIG. 1. (p. 4)figure
      TABLE I (p. 4)table
      TABLE II (p. 5)table
      FIG. 2. (p. 6)figure
      FIG. 3. (p. 6)figure
      FIG. 4. (p. 6)figure
      TABLE III (p. 6)table
      FIG. 5. (p. 7)figure
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