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Bunching dynamics and transport window of intense ion beams in final beam buncher

Published online by Cambridge University Press:  04 April 2003

TAKASHI KIKUCHI ,
MITSUO NAKAJIMA  and
KAZUHIKO HORIOKA
TAKASHI KIKUCHI
Affiliation:
Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama, 226-8502, Japan
MITSUO NAKAJIMA
Affiliation:
Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama, 226-8502, Japan
KAZUHIKO HORIOKA
Affiliation:
Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama, 226-8502, Japan
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Abstract

A longitudinal compression is indispensable in a final stage of the heavy ion driver system using a particle accelerator. For the beam compression, an induction buncher applies the bunching voltage so as to make a considerable velocity tilt between the head and the tail of the beam bunch. However, the velocity tilt induces mismatch oscillation of the beam envelope due to the nonconformity between the beam particle velocity and the confinement force of the lens system. At the first step of design works for the beam transport line, the initial phase advance is decided to avoid resonance lines on the tune diagram. However, as the phase advance changes in the buncher by the velocity tilt, the beam bunch reenters in the resonance condition under certain circumstances. The transport region for avoiding the resonance condition is discussed on a phase diagram, as a function of the phase advance and the velocity tilt.

Keywords

Beam bunchingHeavy ion fusionInduction buncherIntense ion beamsParticle-core model
Type
14th INTERNATIONAL HEAVY ION INERTIAL FUSION SYMPOSIUM PAPERS
Information
Laser and Particle Beams , Volume 20 , Issue 4 , October 2002 , pp. 589 - 593
Copyright
© 2002 Cambridge University Press

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