FEL2012 - List of Authors (Dewa, H.)

Paper	Title	Page
MOPD52	Beam Dynamics Calculations for the SPring-8 Photoinjector System using Multiple Beam Envelope Equations	157
	A. Mizuno, H. Dewa, H. Hanaki, T. Taniuchi, H. Tomizawa JASRI/SPring-8, Hyogo-ken, Japan E. Hotta Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
	A new semi-analytical method of investigating the beam dynamics for electron injectors was developed. In this method, a short bunched electron beam is assumed to be an ensemble of several segmentation pieces in both the longitudinal and transverse directions. The trajectory of each electron in the segmentation pieces is solved by the beam envelope equations. The shape of the entire bunch is consequently calculated, and thus the emittances can be obtained from weighted mean values of the solutions for the obtained electron trajectories. Using this method, dynamics calculation for the SPring-8 RF gun system was performed while taking into account the space charge fields, the image charge fields at a cathode surface,the electromagnetic fields of the RF gun cavity and the following accelerator structure, and the solenoidal coils. In this paper, we discuss applicable conditions for this method by comparing calculation results of this method and that of the particle simulation code.

Paper

Title

Page

Beam Dynamics Calculations for the SPring-8 Photoinjector System using Multiple Beam Envelope Equations

157

A. Mizuno, H. Dewa, H. Hanaki, T. Taniuchi, H. Tomizawa
JASRI/SPring-8, Hyogo-ken, Japan
E. Hotta
Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan

A new semi-analytical method of investigating the beam dynamics for electron injectors was developed. In this method, a short bunched electron beam is assumed to be an ensemble of several segmentation pieces in both the longitudinal and transverse directions. The trajectory of each electron in the segmentation pieces is solved by the beam envelope equations. The shape of the entire bunch is consequently calculated, and thus the emittances can be obtained from weighted mean values of the solutions for the obtained electron trajectories. Using this method, dynamics calculation for the SPring-8 RF gun system was performed while taking into account the space charge fields, the image charge fields at a cathode surface,the electromagnetic fields of the RF gun cavity and the following accelerator structure, and the solenoidal coils. In this paper, we discuss applicable conditions for this method by comparing calculation results of this method and that of the particle simulation code.