CERN Accelerating science

Article
Title	A 700 MHZ, 1 MW CW RF System for a FEL 100mA RF Photoinjector
Author(s)	Roybal, William ; Nguyen, Dinh C ; Reass, William ; Rees, Daniel ; Tallerico, Paul J ; Torrez, Phillip A
Affiliation	(LANL/LANSCE, Los Alamos, New Mexico)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2413
Subject category	Accelerators and Storage Rings
Abstract	This paper describes a 700 MHz, 1 Megawatt CW, high efficiency klystron RF system utilized for a Free Electron Laser (FEL) high-brightness electron photoinjector (PI). The E2V klystron is mod-anode tube that operates with a beam voltage of 95 kV. This tube, operating with a 65% efficiency, requires  96 watts of input power to produce in excess of 1 MW of output power. This output drives the 3rd cell of a 2½-cell, p-mode PI cavity through a pair of planar waveguide windows. Coupling is via a ridge-loaded tapered waveguide section and "dog-bone" iris. This paper will present the design of the RF, RF transport, coupling, and monitoring/protection systems that are required to support CW operations of the 100 mA cesiated, semi-porous SiC photoinjector.