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Title: Effect of Cesium and Xenon Seeding in Negative Hydrogen Ion Sources

Abstract

It is well known that cesium seeding in volume hydrogen negative ion sources leads to a large reduction of the extracted electron current and in some cases to the enhancement of the negative ion current. The cooling of the electrons due to the addition of this heavy impurity was proposed as a possible cause of the mentioned observations. In order to verify this assumption, the authors seeded the hydrogen plasma with xenon, which has an atomic weight almost equal to that of cesium. The plasma properties were studied in the extraction region of the negative ion source Camembert III using a cylindrical electrostatic probe while the negative ion relative density was studied using laser photodetachment. It is shown that the xenon mixing does not enhance the negative ion density and leads to the increase of the electron density, while the cesium seeding reduces the electron density.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
755669
Report Number(s):
ORNL/CP-104940
TRN: US0005069
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 8th International Conference of Ion Sources, Kyoto (JP), 10/06/1999--10/10/1999; Other Information: PBD: 6 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CESIUM; COOLING; ELECTRON DENSITY; ELECTRONS; ELECTROSTATIC PROBES; HYDROGEN IONS; ION SOURCES; MIXING; PLASMA; XENON

Citation Formats

Bacal, M., Brunteau, A.M., Deniset, C., Elizarov, L.I., Sube, F., Tontegode, A.Y., and Whealton, J.H. Effect of Cesium and Xenon Seeding in Negative Hydrogen Ion Sources. United States: N. p., 1999. Web.
Bacal, M., Brunteau, A.M., Deniset, C., Elizarov, L.I., Sube, F., Tontegode, A.Y., & Whealton, J.H. Effect of Cesium and Xenon Seeding in Negative Hydrogen Ion Sources. United States.
Bacal, M., Brunteau, A.M., Deniset, C., Elizarov, L.I., Sube, F., Tontegode, A.Y., and Whealton, J.H. Mon . "Effect of Cesium and Xenon Seeding in Negative Hydrogen Ion Sources". United States. https://www.osti.gov/servlets/purl/755669.
@article{osti_755669,
title = {Effect of Cesium and Xenon Seeding in Negative Hydrogen Ion Sources},
author = {Bacal, M. and Brunteau, A.M. and Deniset, C. and Elizarov, L.I. and Sube, F. and Tontegode, A.Y. and Whealton, J.H.},
abstractNote = {It is well known that cesium seeding in volume hydrogen negative ion sources leads to a large reduction of the extracted electron current and in some cases to the enhancement of the negative ion current. The cooling of the electrons due to the addition of this heavy impurity was proposed as a possible cause of the mentioned observations. In order to verify this assumption, the authors seeded the hydrogen plasma with xenon, which has an atomic weight almost equal to that of cesium. The plasma properties were studied in the extraction region of the negative ion source Camembert III using a cylindrical electrostatic probe while the negative ion relative density was studied using laser photodetachment. It is shown that the xenon mixing does not enhance the negative ion density and leads to the increase of the electron density, while the cesium seeding reduces the electron density.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

Conference:
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