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Title: Electron energy recovery system for negative ion sources

Abstract

An electron energy recovery system for negative ion sources is provided. The system, employs crossed electric and magnetic fields to separate the electrons from ions as they are extracted from a negative ion source plasma generator and before the ions are accelerated to their full kinetic energy. With the electric and magnetic fields oriented 90.degree. to each other, the electrons are separated from the plasma and remain at approximately the electrical potential of the generator in which they were generated. The electrons migrate from the ion beam path in a precessing motion out of the ion accelerating field region into an electron recovery region provided by a specially designed electron collector electrode. The electron collector electrode is uniformly spaced from a surface of the ion generator which is transverse to the direction of migration of the electrons and the two surfaces are contoured in a matching relationship which departs from a planar configuration to provide an electric field component in the recovery region which is parallel to the magnetic field thereby forcing the electrons to be directed into and collected by the electron collector electrode. The collector electrode is maintained at a potential slightly positive with respect to the ionmore » generator so that the electrons are collected at a small fraction of the full accelerating supply voltage energy.« less

Inventors:
 [1];  [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864205
Patent Number(s):
4329586
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
electron; energy; recovery; negative; sources; provided; employs; crossed; electric; magnetic; fields; separate; electrons; extracted; source; plasma; generator; accelerated; kinetic; oriented; 90; degree; separated; remain; approximately; electrical; potential; generated; migrate; beam; path; precessing; motion; accelerating; field; region; specially; designed; collector; electrode; uniformly; spaced; surface; transverse; direction; migration; surfaces; contoured; matching; relationship; departs; planar; configuration; provide; component; parallel; forcing; directed; collected; maintained; slightly; positive; respect; fraction; supply; voltage; supply voltage; uniformly spaced; plasma generator; electron energy; specially designed; electrical potential; electric field; magnetic field; magnetic fields; beam path; kinetic energy; energy recovery; field region; collector electrode; electron collector; field component; voltage energy; planar configuration; crossed electric; /250/

Citation Formats

Dagenhart, William K., and Stirling, William L. Electron energy recovery system for negative ion sources. United States: N. p., 1982. Web.
Dagenhart, William K., & Stirling, William L. Electron energy recovery system for negative ion sources. United States.
Dagenhart, William K., and Stirling, William L. Fri . "Electron energy recovery system for negative ion sources". United States. https://www.osti.gov/servlets/purl/864205.
@article{osti_864205,
title = {Electron energy recovery system for negative ion sources},
author = {Dagenhart, William K. and Stirling, William L.},
abstractNote = {An electron energy recovery system for negative ion sources is provided. The system, employs crossed electric and magnetic fields to separate the electrons from ions as they are extracted from a negative ion source plasma generator and before the ions are accelerated to their full kinetic energy. With the electric and magnetic fields oriented 90.degree. to each other, the electrons are separated from the plasma and remain at approximately the electrical potential of the generator in which they were generated. The electrons migrate from the ion beam path in a precessing motion out of the ion accelerating field region into an electron recovery region provided by a specially designed electron collector electrode. The electron collector electrode is uniformly spaced from a surface of the ion generator which is transverse to the direction of migration of the electrons and the two surfaces are contoured in a matching relationship which departs from a planar configuration to provide an electric field component in the recovery region which is parallel to the magnetic field thereby forcing the electrons to be directed into and collected by the electron collector electrode. The collector electrode is maintained at a potential slightly positive with respect to the ion generator so that the electrons are collected at a small fraction of the full accelerating supply voltage energy.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

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