Input coupler for ERL injector cavities

Author

Veshcherevich, V. ; Bazarov, I. ; Belomestnykh, S. ; Liepe, M. ; Padamsee, H. ; Shemelin, V.

Author_Institution

Lab. for Elementary-Particle Phys., Cornell Univ., Ithaca, NY, USA

Volume

2

fYear

2003

fDate

12-16 May 2003

Firstpage

1201

Abstract

A conceptual design of the input coupler for superconducting injector cavities of Cornell/JLab ERL project is presented. The injector cavities are two-cell structures operating at 1300 MHz in CW mode. The coupler has a symmetric design to accommodate requirements for small transverse kick, high RF power delivery to the cavity, and high input coupling value. Therefore it consists of two identical antenna type couplers symmetrically attached to a beam pipe of the cavity. Each coupler delivers 50 kW of CW RF power to the beam. The coupler has a variable coupling. Q_ext should be varied from 4.6 × 10⁴ to 4.1 × 10⁵. The symmetric design of the coupler dramatically reduces the transverse kick, a critical requirement for the ERL project. Estimates of the influence of coupler induced fields on beam dynamics are given.

Keywords

accelerator RF systems; accelerator cavities; accelerator magnets; linear accelerators; particle beam dynamics; particle beam injection; superconducting magnets; CW mode; ERL injector cavities; RF power; antenna type couplers; beam dynamics; beam pipe; high RF power cavity; input coupler; superconducting injector cavities; symmetric design; two-cell structures; Acceleration; Brightness; Electron beams; Laboratories; Linear particle accelerator; Optical coupling; Physics; Radio frequency; Superconducting transmission lines; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289652

Filename

1289652