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Title: Method and source for producing a high concentration of positively charged molecular hydrogen or deuterium ions

Abstract

One principal object of the present invention is to provide a novel method and apparatus for generating a high concentration of H/sub 2//sup +/ or D/sub 2//sup +/ ions by using a new and improved multicusp ion source. The basic principle in achieving a high percentage of H/sub 2//sup +/ or D/sub 2//sup +/ ions is to extract them from the source as soon as they are produced. Otherwise they will react with background gas molecules to form tri-atomic ions H/sub 3//sup +/ or D/sub 3//sup +/ or be dissociated by electrons. The former reaction H/sub 2//sup +/ + H/sub 2/ ..-->.. H/sub 3//sup +/ + H can have a very short mean free path length lambda. Assuming a background neutral gas density of approximately 3.3 x 10/sup 13/ cm/sup -3/ and a cross-section sigma of approximately 6 x 10/sup -15/ cm/sup 2/, lambda = (n/sub 0/ sigma)/sup -1/ is estimated to be about 5 cm. Thus the distance traversed by the H/sub 2//sup +/ ion before it arrives at the extractor electrode cannot exceed this value. This in turn sets a limit on the length of the source chamber.

Inventors:
;
Issue Date:
OSTI Identifier:
6959168
Application Number:
ON: DE84011030
Assignee:
Dept. of Energy ERA-09-027615; EDB-84-088615
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION SOURCES; PATENTS; CUSPED GEOMETRIES; DEUTERIUM IONS; DISTRIBUTION; GASES; HYDROGEN IONS 2 PLUS; CATIONS; CHARGED PARTICLES; DOCUMENT TYPES; FLUIDS; HYDROGEN IONS; IONS; MAGNETIC FIELD CONFIGURATIONS; MOLECULAR IONS; OPEN CONFIGURATIONS; 700205* - Fusion Power Plant Technology- Fuel, Heating, & Injection Systems

Citation Formats

Ehlers, K.W., and Leung, K.N. Method and source for producing a high concentration of positively charged molecular hydrogen or deuterium ions. United States: N. p., 1983. Web.
Ehlers, K.W., & Leung, K.N. Method and source for producing a high concentration of positively charged molecular hydrogen or deuterium ions. United States.
Ehlers, K.W., and Leung, K.N. Tue . "Method and source for producing a high concentration of positively charged molecular hydrogen or deuterium ions". United States.
@article{osti_6959168,
title = {Method and source for producing a high concentration of positively charged molecular hydrogen or deuterium ions},
author = {Ehlers, K.W. and Leung, K.N.},
abstractNote = {One principal object of the present invention is to provide a novel method and apparatus for generating a high concentration of H/sub 2//sup +/ or D/sub 2//sup +/ ions by using a new and improved multicusp ion source. The basic principle in achieving a high percentage of H/sub 2//sup +/ or D/sub 2//sup +/ ions is to extract them from the source as soon as they are produced. Otherwise they will react with background gas molecules to form tri-atomic ions H/sub 3//sup +/ or D/sub 3//sup +/ or be dissociated by electrons. The former reaction H/sub 2//sup +/ + H/sub 2/ ..-->.. H/sub 3//sup +/ + H can have a very short mean free path length lambda. Assuming a background neutral gas density of approximately 3.3 x 10/sup 13/ cm/sup -3/ and a cross-section sigma of approximately 6 x 10/sup -15/ cm/sup 2/, lambda = (n/sub 0/ sigma)/sup -1/ is estimated to be about 5 cm. Thus the distance traversed by the H/sub 2//sup +/ ion before it arrives at the extractor electrode cannot exceed this value. This in turn sets a limit on the length of the source chamber.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {7}
}