CERN Accelerating science

Article
Title	A Three-Cell Superconducting Deflecting Cavity Design for the ALS at LBNL
Author(s)	Shi, Jiaru ; Byrd, John ; Chen Huai Bi ; Li, Derun ; Zheng, Shuxin
Affiliation	(LBNL, Berkeley) ; (TUB, Beijing)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.4287
Subject category	Accelerators and Storage Rings
Abstract	Deflecting RF cavities can be used to generate sub-pico-second x-rays by creating correlations between longitudinal and transverse phase space of electron bunches in radiation devices. Up to 2-MV defecting voltage at 1.5-GHz is required for 1.9-GeV electron beam at the Advanced Light Source (ALS) at LBNL. We present a conceptual design for a 1.5-GHz three-cell superconducting RF cavity and its coupler. The cavity geometry and deflecting shunt impedance are optimized using MAFIA code. The cavity impedance from lower and higher order modes (LOM and HOM) are computed. Possible schemes for damping most harmful LOM and HOM modes are discussed and simulated.