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Title: Increasing the Space Charge Limit and Other Effects of Cesium Seeding in Hydrogen Negative Ion Sources

Abstract

The role of cesium seeding in increasing the negative ion current in volume sources is described. By a reduction in the local plasma potential the current of extracted electrons is vastly reduced. As a result, cesium increases the fraction of the transverse space charge limit available to the ions by as much as a factor of three. In addition, cesium can increase the total space charge limit by injection of Cs+ into the presheath-a newly recognized phenomenon consistent with experimental measurements and determined from application of a Double-Vlasov model for negative ion extraction.

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (US)
Sponsoring Org.:
USDOE Office of Science (US)
OSTI Identifier:
14354
Report Number(s):
ORNL/CP-104439
TRN: US0111010
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Conference
Resource Relation:
Conference: 8th International Conference of Ion Sources, Kyoto (JP), 09/06/1999--09/10/1999; Other Information: PBD: 6 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CESIUM; ELECTRONS; HYDROGEN IONS; ION SOURCES; PLASMA POTENTIAL; SPACE CHARGE; BEAM EXTRACTION; LIMITING VALUES

Citation Formats

Bacal, M., Bruneteau, J., Raridon, R.J., and Whealton, J.H. Increasing the Space Charge Limit and Other Effects of Cesium Seeding in Hydrogen Negative Ion Sources. United States: N. p., 1999. Web.
Bacal, M., Bruneteau, J., Raridon, R.J., & Whealton, J.H. Increasing the Space Charge Limit and Other Effects of Cesium Seeding in Hydrogen Negative Ion Sources. United States.
Bacal, M., Bruneteau, J., Raridon, R.J., and Whealton, J.H. Mon . "Increasing the Space Charge Limit and Other Effects of Cesium Seeding in Hydrogen Negative Ion Sources". United States. https://www.osti.gov/servlets/purl/14354.
@article{osti_14354,
title = {Increasing the Space Charge Limit and Other Effects of Cesium Seeding in Hydrogen Negative Ion Sources},
author = {Bacal, M. and Bruneteau, J. and Raridon, R.J. and Whealton, J.H.},
abstractNote = {The role of cesium seeding in increasing the negative ion current in volume sources is described. By a reduction in the local plasma potential the current of extracted electrons is vastly reduced. As a result, cesium increases the fraction of the transverse space charge limit available to the ions by as much as a factor of three. In addition, cesium can increase the total space charge limit by injection of Cs+ into the presheath-a newly recognized phenomenon consistent with experimental measurements and determined from application of a Double-Vlasov model for negative ion extraction.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

Conference:
Other availability
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