125 MHz cavity for NAR

Author

Shibayama, A.

Author_Institution

NTT Corp., Kanagawa, Japan

fYear

1989

fDate

20-23 Mar 1989

Firstpage

240

Abstract

The author describes the design of an RF cavity installed in Nippon Telegraph and Telephone´s Normal-conducting Accelerating Ring (NAR), considering both the beam loading effect just after high current injection and higher-order-mode (HOM) transverse impedances. It was found using the 3-D program MAFIA that transverse HOM impedances, except for the TM₁₁₀ mode, were of a negligible order of less than 10^-9 MΩ in the case of an acceleration gap width of 2 cm. In the NAR, multiturn single cycle injection was applied because of the extremely long damping time of the 13-MeV injection beam. To estimate the induced RF voltage by the injected beam and the energy spread by bunch rotation, the behavior of injected electrons on the energy RF-phase space was simulated. The reentrant-type 125-MHz cavity with a gap of 2 cm and a detuning frequency of 1 MHz was fabricated

Keywords

beam handling equipment; electron accelerators; 1 MHz; 125 MHz; 125 MHz cavity; 2 cm; MAFIA; NAR; Normal-conducting Accelerating Ring; RF cavity; TM₁₁₀ mode; beam loading effect; design; detuning frequency; high current injection; higher order mode transverse impedances; induced RF voltage; multiturn single cycle injection; Acceleration; Damping; Frequency; Impedance; Laboratories; Large scale integration; Particle beam injection; Particle beams; Synchrotron radiation; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/PAC.1989.73022

Filename

73022