Neutral beamline with improved ion energy recovery

Patent · Sun Jan 01 00:00:00 EST 1984

OSTI ID:864931

Kim, Jinchoon ^[1]

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1. San Diego, CA

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4439395
• OSTI ID: 864931
• Country of Publication: United States
• Language: English

Related Subjects

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
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