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Title: Neutral beamline with improved ion energy recovery

Abstract

A neutral beamline employing direct energy recovery of unneutralized residual ions is provided which enhances the energy recovery of the full energy ion component of the beam exiting the neutralizer cell, and thus improves the overall neutral beamline efficiency. The unneutralized full energy ions exiting the neutralizer are deflected from the beam path and the electrons in the cell are blocked by a magnetic field applied transverse to the beam direction in the neutral izer exit region. The ions which are generated at essentially ground potential and accelerated through the neutralizer cell by a negative acceleration voltage are collected at ground potential. A neutralizer cell exit end region is provided which allows the magnetic and electric fields acting on the exiting ions to be loosely coupled. As a result, the fractional energy ions exiting the cell are reflected onto and collected at an interior wall of the neutralizer formed by the modified end geometry, and thus do not detract from the energy recovery efficiency of full energy ions exiting the cell. Electrons within the neutralizer are prevented from exiting the neutralizer end opening by the action of crossed fields drift (ExB) and are terminated to a collector collar around themore » downstream opening of the neutralizer. The correct combination of the extended neutralizer end structure and the magnet region is designed so as to maximize the exit of full energy ions and to contain the fractional energy ions.« less

Inventors:
 [1]
  1. (San Diego, CA)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864931
Patent Number(s):
4439395
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:
neutral; beamline; improved; energy; recovery; employing; direct; unneutralized; residual; provided; enhances; component; beam; exiting; neutralizer; cell; improves; overall; efficiency; deflected; path; electrons; blocked; magnetic; field; applied; transverse; direction; izer; exit; region; generated; essentially; ground; potential; accelerated; negative; acceleration; voltage; collected; allows; electric; fields; acting; loosely; coupled; result; fractional; reflected; interior; wall; formed; modified; geometry; detract; prevented; action; crossed; drift; exb; terminated; collector; collar; downstream; correct; combination; extended; structure; magnet; designed; maximize; contain; recovery efficiency; neutral beamline; neutralizer cell; beam exit; ground potential; interior wall; electric field; magnetic field; neutral beam; beam path; energy recovery; electric fields; beam direction; field applied; negative acceleration; direct energy; acceleration voltage; beam exiting; /376/250/

Citation Formats

Kim, Jinchoon. Neutral beamline with improved ion energy recovery. United States: N. p., 1984. Web.
Kim, Jinchoon. Neutral beamline with improved ion energy recovery. United States.
Kim, Jinchoon. Sun . "Neutral beamline with improved ion energy recovery". United States. https://www.osti.gov/servlets/purl/864931.
@article{osti_864931,
title = {Neutral beamline with improved ion energy recovery},
author = {Kim, Jinchoon},
abstractNote = {A neutral beamline employing direct energy recovery of unneutralized residual ions is provided which enhances the energy recovery of the full energy ion component of the beam exiting the neutralizer cell, and thus improves the overall neutral beamline efficiency. The unneutralized full energy ions exiting the neutralizer are deflected from the beam path and the electrons in the cell are blocked by a magnetic field applied transverse to the beam direction in the neutral izer exit region. The ions which are generated at essentially ground potential and accelerated through the neutralizer cell by a negative acceleration voltage are collected at ground potential. A neutralizer cell exit end region is provided which allows the magnetic and electric fields acting on the exiting ions to be loosely coupled. As a result, the fractional energy ions exiting the cell are reflected onto and collected at an interior wall of the neutralizer formed by the modified end geometry, and thus do not detract from the energy recovery efficiency of full energy ions exiting the cell. Electrons within the neutralizer are prevented from exiting the neutralizer end opening by the action of crossed fields drift (ExB) and are terminated to a collector collar around the downstream opening of the neutralizer. The correct combination of the extended neutralizer end structure and the magnet region is designed so as to maximize the exit of full energy ions and to contain the fractional energy ions.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {1}
}

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