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Title: Use of predissociation to enhance the atomic hydrogen ion fraction in ion sources

Abstract

A duopigatron ion source is modified by replacing the normal oxide-coated wire filament cathode of the ion source with a hot tungsten oven through which hydrogen gas is fed into the arc chamber. The hydrogen gas is predissociated in the hot oven prior to the arc discharge, and the recombination rate is minimized by hot walls inside of the arc chamber. With the use of the above modifications, the atomic H.sub.1.sup.+ ion fraction output can be increased from the normal 50% to greater than 70% with a corresponding decrease in the H.sub.2.sup.+ and H.sub.3.sup.+ molecular ion fraction outputs from the ion source.

Inventors:
 [1]
  1. Oak Ridge, TN
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
OSTI Identifier:
863263
Patent Number(s):
US 4135093
Assignee:
United States of America as represented by United States (Washington, DC)
DOE Contract Number:  
AC04-76
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
predissociation; enhance; atomic; hydrogen; fraction; sources; duopigatron; source; modified; replacing; normal; oxide-coated; wire; filament; cathode; hot; tungsten; oven; gas; fed; chamber; predissociated; prior; discharge; recombination; rate; minimized; walls; inside; modifications; output; increased; 50; 70; corresponding; decrease; molecular; outputs; atomic hydrogen; wire filament; hydrogen gas; coated wire; filament cathode; recombination rate; /250/

Citation Formats

Kim, Jinchoon. Use of predissociation to enhance the atomic hydrogen ion fraction in ion sources. United States: N. p., 1979. Web.
Kim, Jinchoon. Use of predissociation to enhance the atomic hydrogen ion fraction in ion sources. United States.
Kim, Jinchoon. Mon . "Use of predissociation to enhance the atomic hydrogen ion fraction in ion sources". United States. https://www.osti.gov/servlets/purl/863263.
@article{osti_863263,
title = {Use of predissociation to enhance the atomic hydrogen ion fraction in ion sources},
author = {Kim, Jinchoon},
abstractNote = {A duopigatron ion source is modified by replacing the normal oxide-coated wire filament cathode of the ion source with a hot tungsten oven through which hydrogen gas is fed into the arc chamber. The hydrogen gas is predissociated in the hot oven prior to the arc discharge, and the recombination rate is minimized by hot walls inside of the arc chamber. With the use of the above modifications, the atomic H.sub.1.sup.+ ion fraction output can be increased from the normal 50% to greater than 70% with a corresponding decrease in the H.sub.2.sup.+ and H.sub.3.sup.+ molecular ion fraction outputs from the ion source.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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