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Title: Surface-plasma generation of negative ions in gas discharges without cesium

Abstract

Surface-plasma generation (SPG) of negative ions in gas discharges is extremely sensitive to small admixture of uncontrolled impurities. An efficiency of SPG was greatly improved by injection into discharge a small amount of cesium or other substances with low ionization potential. For explanation of anomalistic H{sup -} generation in discharges without the addition of cesium it is important to identify the sources of important impurities. Generation of H{sup -} ion in different ion sources is analyzed. Sources of impurities catalyzing SPG are proposed. A higher probability of cold H{sup -} extraction is outlined and explained. A proposal for enhanced H{sup -} generation in discharges without cesium is presented. Further experiments for identification of the dominant mechanism of H{sup -} generation are discussed.

Authors:
;  [1]
  1. Brookhaven Technology Group, Inc., Setauket, New York 11733 (United States)
Publication Date:
OSTI Identifier:
20779019
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: 10.1063/1.2176689; (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; BEAM EXTRACTION; CESIUM; ELECTRIC DISCHARGES; HYDROGEN; HYDROGEN IONS 1 MINUS; ION SOURCES; IONIZATION POTENTIAL; PLASMA; PLASMA IMPURITIES; PROBABILITY; SURFACES

Citation Formats

Dudnikov, Vadim, and Farrell, J. Paul. Surface-plasma generation of negative ions in gas discharges without cesium. United States: N. p., 2006. Web. doi:10.1063/1.2176689.
Dudnikov, Vadim, & Farrell, J. Paul. Surface-plasma generation of negative ions in gas discharges without cesium. United States. doi:10.1063/1.2176689.
Dudnikov, Vadim, and Farrell, J. Paul. Wed . "Surface-plasma generation of negative ions in gas discharges without cesium". United States. doi:10.1063/1.2176689.
@article{osti_20779019,
title = {Surface-plasma generation of negative ions in gas discharges without cesium},
author = {Dudnikov, Vadim and Farrell, J. Paul},
abstractNote = {Surface-plasma generation (SPG) of negative ions in gas discharges is extremely sensitive to small admixture of uncontrolled impurities. An efficiency of SPG was greatly improved by injection into discharge a small amount of cesium or other substances with low ionization potential. For explanation of anomalistic H{sup -} generation in discharges without the addition of cesium it is important to identify the sources of important impurities. Generation of H{sup -} ion in different ion sources is analyzed. Sources of impurities catalyzing SPG are proposed. A higher probability of cold H{sup -} extraction is outlined and explained. A proposal for enhanced H{sup -} generation in discharges without cesium is presented. Further experiments for identification of the dominant mechanism of H{sup -} generation are discussed.},
doi = {10.1063/1.2176689},
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}
}