CERN Accelerating science

Article
Title	Geometry Optimization of DC/RF Photoelectron Gun
Author(s)	Chen Ping ; Yi, Rong ; Yu, David
Affiliation	(DULY Research Inc., Rancho Palos Verdes, California)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.3679
Subject category	Accelerators and Storage Rings
Abstract	Pre-acceleration of photoelectrons in a pulsed, high voltage, short, dc gap and its subsequent injection into an rf gun is a promising method to improve electron beam emittance in rf accelerators. Simulation work has been performed in order to optimize the geometric shapes of a dc/rf gun and improve electron beam properties. Variations were made on cathode and anode shapes, dc gap distance, and inlet shape of the rf cavity. Simulations showed that significant improvement on the normalized emittance (< 1 mm-mrad), compared to a dc gun with flat cathode, could be obtained after the geometric shapes of the gun were optimized.