Yk. Batygin et al., UNIFORM TARGET IRRADIATION BY CIRCULAR BEAM SWEEPING, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 363(1-2), 1995, pp. 128-130
A circular sweep of the beam over a large target for making a uniform
irradiation zone is suggested. The scan pattern is an untwisted spiral
for a continuous beam or a family of concentric circles for a bunched
beam. The deflection voltage is provided by RF cavities with orthogon
al transverse fields shifted in time by pi/2. The amplitude of the def
lection voltage as a function of time and the optimal beam scan freque
ncy with respect to the RF frequency of the accelerator are given. The
considered method of target irradiation can be useful in different ap
plications of charged particle beams including microfilters production
and transmutation of nuclear wastes where a large amplitude of the de
flection voltage and a high uniformity of irradiation are required.