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Title: Surface Plasma Source Electrode Activation by Surface Impurities

Abstract

In experiments with RF saddle antenna surface plasma sources (SPS), the efficiency of H{sup -} ion generation was increased by up to a factor of 5 by plasma electrode 'activation', without supplying additional Cs, by heating the collar to high temperature for several hours using hot air flow and plasma discharge. Without cracking or heating the cesium ampoule, but likely with Cs recovery from impurities, the achieved energy efficiency was comparable to that of conventionally cesiated SNS RF sources with an external or internal Cs supply. In the experiments, optimum cesiation was produced (without additional Cs) by the collection and trapping of traces of remnant cesium compounds from SPS surfaces. Such activation by accumulation of impurities on electrode surfaces can be a reason for H{sup -} emission enhancement in other so-called 'volume' negative ion sources.

Authors:
;  [1]; ; ; ; ; ;  [2]
  1. Muons, Inc., 552 N. Batavia Ave., Batavia, IL, 60510 (United States)
  2. Oak Ridge National Laboratory, Oak Ridge, TN, 37831 (United States)
Publication Date:
OSTI Identifier:
21611686
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1390; Journal Issue: 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637412; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 43 PARTICLE ACCELERATORS; ANTENNAS; CESIUM; ELECTRODES; ENERGY EFFICIENCY; HYDROGEN IONS 1 MINUS; ION SOURCES; PLASMA; PLASMA HEATING; PLASMA IMPURITIES; RF SYSTEMS; TRAPPING; ALKALI METALS; ANIONS; CHARGED PARTICLES; EFFICIENCY; ELECTRICAL EQUIPMENT; ELEMENTS; EQUIPMENT; HEATING; HYDROGEN IONS; IMPURITIES; IONS; METALS

Citation Formats

Dudnikov, Vadim, Johnson, Rolland P., Han, B., Murray, S. N., Pennisi, T. R., Santana, M., Stockli, Martin P., and Welton, R. F. Surface Plasma Source Electrode Activation by Surface Impurities. United States: N. p., 2011. Web. doi:10.1063/1.3637412.
Dudnikov, Vadim, Johnson, Rolland P., Han, B., Murray, S. N., Pennisi, T. R., Santana, M., Stockli, Martin P., & Welton, R. F. Surface Plasma Source Electrode Activation by Surface Impurities. United States. doi:10.1063/1.3637412.
Dudnikov, Vadim, Johnson, Rolland P., Han, B., Murray, S. N., Pennisi, T. R., Santana, M., Stockli, Martin P., and Welton, R. F. Mon . "Surface Plasma Source Electrode Activation by Surface Impurities". United States. doi:10.1063/1.3637412.
@article{osti_21611686,
title = {Surface Plasma Source Electrode Activation by Surface Impurities},
author = {Dudnikov, Vadim and Johnson, Rolland P. and Han, B. and Murray, S. N. and Pennisi, T. R. and Santana, M. and Stockli, Martin P. and Welton, R. F.},
abstractNote = {In experiments with RF saddle antenna surface plasma sources (SPS), the efficiency of H{sup -} ion generation was increased by up to a factor of 5 by plasma electrode 'activation', without supplying additional Cs, by heating the collar to high temperature for several hours using hot air flow and plasma discharge. Without cracking or heating the cesium ampoule, but likely with Cs recovery from impurities, the achieved energy efficiency was comparable to that of conventionally cesiated SNS RF sources with an external or internal Cs supply. In the experiments, optimum cesiation was produced (without additional Cs) by the collection and trapping of traces of remnant cesium compounds from SPS surfaces. Such activation by accumulation of impurities on electrode surfaces can be a reason for H{sup -} emission enhancement in other so-called 'volume' negative ion sources.},
doi = {10.1063/1.3637412},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1390,
place = {United States},
year = {2011},
month = {9}
}