Radiant energy – With charged particle beam deflection or focussing – Magnetic lens
Patent
1989-09-29
1990-10-09
Anderson, Bruce C.
Radiant energy
With charged particle beam deflection or focussing
Magnetic lens
250396R, 250398, H01J 37141
Patent
active
049623176
ABSTRACT:
A charged particle beam is formed to a relatively larger area beam which is well-contained and has a beam area which relatively uniformly deposits energy over a beam target. Linear optics receive an accelerator beam and output a first beam with a first waist defined by a relatively small size in a first dimension normal to a second dimension. Nonlinear optics, such as an octupole magnet, are located about the first waist and output a second beam having a phase-space distribution which folds the beam edges along the second dimension toward the beam core to develop a well-contained beam and a relatively uniform particle intensity across the beam core. The beam may then be expanded along the second dimension to form the uniform ribbon beam at a selected distance from the nonlinear optics. Alternately, the beam may be passed through a second set of nonlinear optics to fold the beam edges in the first dimension. The beam may then be uniformly expanded along the first and second dimensions to form a well-contained, two-dimensional beam for illuminating a two-dimensional target with a relatively uniform energy deposition.
REFERENCES:
patent: 4276477 (1981-06-01), Enge
patent: 4468587 (1984-08-01), Sluyterman
patent: 4486644 (1984-12-01), Wollnik
patent: 4736106 (1988-04-01), Kasky
patent: 4804851 (1989-02-01), Nixon
patent: 4823013 (1989-04-01), Van der Mast
patent: 4853545 (1989-08-01), Rose
E. Kashy et al., "A Method for the Uniform Charged Particle Irradiation of Large Targets", B26 Nucl. Instr. and Meth., pp. 610-613 (1987).
B. Sherrill et al., "Use of Multipole Magnetic Fields for Making Uniform Irradiations", B40/41 Nucl. Instr. and Meth., pp. 1004-1007 (1989).
Blind Barbara
Jason Andrew J.
Anderson Bruce C.
Gaetjens Paul D.
Moser William R.
The United States of America as represented by the United States
Wilson Ray G.
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