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Solenoid and monocusp ion source

United States Patent

*** EXPIRED ***
October 7, 1997
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
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.
Brainard; John Paul (Albuquerque, NM), Burns; Erskine John Thomas (Albuquerque, NM), Draper; Charles Hadley (Albuquerque, NM)
The United States of America as represented by the United States (Washington, DC)
08/ 407,455
March 20, 1995
The Government has rights in this invention pursuant to Contract No. DE-AC04-94AL85000 between the U.S. Department of Energy and Martin Marietta Corporation.