|講演者||陳 栄浩 氏 (KEK)|
|連絡先||内藤 富士雄 (PHS:4174)|
In this talk. I present a new two particle model for study of beam instabilities in the presence of the space-charge force. It is a simple expansion of the well-known Chao's two particle model for a strong head-tail instability and is still analytically solvable. The 3-dimensional contour plot of the growth rate as a function of the wake field strength and the space-charge tune shift reveals stopband structures. Many simulation results generally indicate that beam instability can be damped by a weak space-charge force. but the beam becomes unstable again when the space charge force is further increased. The new two particle model qualitatively explains these behaviors.