Title :
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
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. Qext 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;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289652
