| Paper |
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| WEPLT110 |
Specific Beam Dynamics in Super-bunch Acceleration
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2107 |
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- Y. Shimosaki, E. Nakamura, K. Takayama, T. Toyama
KEK, Ibaraki
- K. Horioka, M. Nakajima
TIT, Yokohama
- K. Koseki
GUAS/AS, Ibaraki
- K. Torikai
Kyushu University, Fukuoka
- M. Watanabe
RIKEN, Saitama
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Proof-of-principle experiments on the induction synchrotron concept using the KEK 12-GeV PS makes progress, in which RF bunches and a super-bunch will be accelerated with a long step voltage generated in the induction accelerating gaps. In order to give a guide for super-bunch acceleration, the beam stabilities against a droop and a fluctuation of the accelerating voltage have been examined by using a simulation. The droop voltage gives an additional focusing or defocusing force in the longitudinal direction, which leads the mismatching beyond the transition energy. Furthermore, the extremely slow fluctuation of the accelerating voltage causes a lowest-order resonance near the transition. These induce a serious emittance blow-up in the longitudinal, so that the compensating manners will be presented. Moreover, the other issues such as head-tail instability and intra beam scattering will be discussed.
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