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 »
- Inventors:
-
- Oak Ridge, TN
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 864205
- Patent Number(s):
- 4329586
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01J - ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05H - PLASMA TECHNIQUE
- 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 = {Fri Jan 01 00:00:00 EST 1982},
month = {Fri Jan 01 00:00:00 EST 1982}
}