Solenoid and monocusp ion source

Patent · Wed Jan 01 04:00:00 EST 1997

OSTI ID:871175

Brainard, John Paul ^[1]; Burns, Erskine John Thomas ^[1]; Draper, Charles Hadley ^[1]

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1. Albuquerque, NM

An ion source which generates hydrogen ions having high atomic purity incorporates a solenoidal permanent magnets to increase the electron path length. In a sealed envelope, electrons emitted from a cathode traverse the magnetic field lines of a solenoid and a monocusp magnet between the cathode and a reflector at the monocusp. As electrons collide with gas, the molecular gas forms a plasma. An anode grazes the outer boundary of the plasma. Molecular ions and high energy electrons remain substantially on the cathode side of the cusp, but as the ions and electrons are scattered to the aperture side of the cusp, additional collisions create atomic ions. The increased electron path length allows for smaller diameters and lower operating pressures.

• Research Organization: SANDIA CORP
• DOE Contract Number: AC04-94AL85000
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5675606
• OSTI ID: 871175
• Country of Publication: United States
• Language: English

Related Subjects

/315/
additional
allows
anode
aperture
atomic
boundary
cathode
collide
collisions
create
cusp
diameters
electron
electrons
electrons emitted
emitted
energy
energy electron
energy electrons
envelope
field
field lines
forms
gas
generates
grazes
hydrogen
incorporates
increase
increased
length
lines
magnet
magnetic
magnetic field
magnets
molecular
molecular gas
monocusp
operating
operating pressure
operating pressures
outer
outer boundary
path
path length
permanent
permanent magnet
permanent magnets
plasma
pressures
purity
reflector
remain
remain substantially
scattered
sealed
sealed envelope
solenoid
solenoidal
source
substantially
traverse