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Title: Pressure optimization for H{sup -} ion production in an electron cyclotron resonance-driven and a filamented source

Abstract

The negative ion density as a function of the hydrogen pressure (1-8 mTorr) in the electron cyclotron resonance-driven version of the magnetic multipole volume source 'Camembert III' is measured by means of the photodetachment technique. An optimum value is observed between 4 and 5 mTorr, yielding a H{sup -} ion density of about 1.5x10{sup 9} cm{sup -3} in the center of the source. The electron density monotonously increases in the range {approx}(0.5-2.5)x10{sup 10} cm{sup -3} and the electron temperature decreases ({approx}1.25-0.5 eV). The optimum pressure for H{sup -} production is equally reported for a conventional filamented multipole source, in which the influence of rovibrationally excited hydrogen molecules in the electronic ground state on the formation of H{sup -} is analyzed. The physical mechanism which determines the existence of this ion density maximum is discussed.

Authors:
; ; ;  [1];  [2]
  1. LPTP, Ecole Polytechnique, UMR 7648 du CNRS, 91128 Palaiseau (France)
  2. (Germany)
Publication Date:
OSTI Identifier:
20779017
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 77; Journal Issue: 3; Conference: 11. international conference on ion sources, Caen (France), 12-16 Sep 2005; Other Information: DOI: 10.1063/1.2172343; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ELECTRON CYCLOTRON-RESONANCE; ELECTRON DENSITY; ELECTRON TEMPERATURE; GROUND STATES; HYDROGEN; HYDROGEN IONS 1 MINUS; ION BEAMS; ION DENSITY; ION SOURCES; ION TEMPERATURE; OPTIMIZATION; PLASMA DENSITY; PLASMA DIAGNOSTICS

Citation Formats

Svarnas, P., Breton, J., Bacal, M., Mosbach, T., and Institut fuer Laser- und Plasmaphysik, Universitaet Duisburg-Essen, Campus Essen, D-45117 Essen. Pressure optimization for H{sup -} ion production in an electron cyclotron resonance-driven and a filamented source. United States: N. p., 2006. Web. doi:10.1063/1.2172343.
Svarnas, P., Breton, J., Bacal, M., Mosbach, T., & Institut fuer Laser- und Plasmaphysik, Universitaet Duisburg-Essen, Campus Essen, D-45117 Essen. Pressure optimization for H{sup -} ion production in an electron cyclotron resonance-driven and a filamented source. United States. doi:10.1063/1.2172343.
Svarnas, P., Breton, J., Bacal, M., Mosbach, T., and Institut fuer Laser- und Plasmaphysik, Universitaet Duisburg-Essen, Campus Essen, D-45117 Essen. Wed . "Pressure optimization for H{sup -} ion production in an electron cyclotron resonance-driven and a filamented source". United States. doi:10.1063/1.2172343.
@article{osti_20779017,
title = {Pressure optimization for H{sup -} ion production in an electron cyclotron resonance-driven and a filamented source},
author = {Svarnas, P. and Breton, J. and Bacal, M. and Mosbach, T. and Institut fuer Laser- und Plasmaphysik, Universitaet Duisburg-Essen, Campus Essen, D-45117 Essen},
abstractNote = {The negative ion density as a function of the hydrogen pressure (1-8 mTorr) in the electron cyclotron resonance-driven version of the magnetic multipole volume source 'Camembert III' is measured by means of the photodetachment technique. An optimum value is observed between 4 and 5 mTorr, yielding a H{sup -} ion density of about 1.5x10{sup 9} cm{sup -3} in the center of the source. The electron density monotonously increases in the range {approx}(0.5-2.5)x10{sup 10} cm{sup -3} and the electron temperature decreases ({approx}1.25-0.5 eV). The optimum pressure for H{sup -} production is equally reported for a conventional filamented multipole source, in which the influence of rovibrationally excited hydrogen molecules in the electronic ground state on the formation of H{sup -} is analyzed. The physical mechanism which determines the existence of this ion density maximum is discussed.},
doi = {10.1063/1.2172343},
journal = {Review of Scientific Instruments},
number = 3,
volume = 77,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}