Circular, confined distribution for charged particle beams

Details Circular, confined distribution for charged particle beams Circular, confined distribution for charged particle beams

1994-09-09

1995-11-21

Anderson, Bruce C.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

250358, H01J 3714

Patent

active

054689651

ABSTRACT:
A charged particle beam line is formed with magnetic optics that manipulate the charged particle beam to form the beam having a generally rectangular configuration to a circular beam cross-section having a uniform particle distribution at a predetermined location. First magnetic optics form a charged particle beam to a generally uniform particle distribution over a square planar area at a known first location. Second magnetic optics receive the charged particle beam with the generally square configuration and affect the charged particle beam to output the charged particle beam with a phase-space distribution effective to fold corner portions of the beam toward the core region of the beam. The beam forms a circular configuration having a generally uniform spatial particle distribution over a target area at a predetermined second location.

REFERENCES:
patent: 4429229 (1984-01-01), Gluckstern
patent: 4736106 (1988-04-01), Kasky
patent: 4767930 (1988-08-01), Stieber et al.
patent: 4823013 (1989-04-01), Van Der Mast
patent: 4853545 (1989-08-01), Rose
patent: 4962317 (1990-10-01), Jason
E. Kashy et al., "A Method for the Uniform Charged Particle Irradiation of Large Targets," B26 Nuclear Instruments and Methods in Physics Research, pp. 610-613 (1987), North-Holland, Amsterdam.
B. Sherrill et al., "Use of Multipole Magnetic Fields for Making Uniform Irradiations," B40/41 Nuclear Instruments and Methods in Physics Research, pp. 1004-1007 (1989), North-Holland, Amsterdam.

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