CERN Accelerating science

Article
Title	Beam Dynamics and Pulse Duration Control During Final Beam Bunching in Driver System for Heavy Ion Inertial Fusion
Author(s)	Kikuchi, Takashi ; Horioka, Kazuhiko ; Katayama, Takeshi ; Kawata, Shigeo ; Nakajima, Mitsuo ; Someya, Tetsuo
Affiliation	(CNS, Saitama) ; (TIT, Yokohama) ; (Utsunomiya University, Utsunomiya)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2735
Subject category	Accelerators and Storage Rings
Abstract	Beam dynamics is investigated by multi-particle simulations during a final beam bunching in a driver system for heavy ion inertial fusion (HIF). The longitudinal bunch compression causes the beam instability induced by the strong space charge effect. The multi-particle simulation can indicate the emittance growth due to the longitudinal bunch compression. Dependence in the beam pulse duration is also investigated for effective pellet implosion in HIF. Not only the spatial nonuniformity of the beam illumination, but also the errors of the beam pulse duration cause changes of implosion dynamics. The allowable regime of the beam pulse duration for the effective fusion output becomes narrow with decreasing the input beam energy. The voltage accuracy requirement at the beam velocity modulator is also estimated for the final beam bunching. It is estimated that the integrated voltage error is allowable as a few percent.