CERN Accelerating science

Article
Title	Electron Gun and Injector Designs for State-of-the-Art FELs
Author(s)	Blüm, H P ; Ambrosio, A ; Christina, V ; Cole, M D ; Falletta, M ; Holmes, D ; Peterson, E ; Rathke, J ; Schultheiss, T ; Todd, A M M ; Wong, R
Affiliation	(AES, Princeton, New Jersey BNL, Upton, Long Island, New York Jefferson Lab, Newport News, Virginia ORNL, Oak Ridge, Tennessee LANL, Los Alamos, New Mexico FZR, Dresden ANL, Argonne, Illinois DESY, Hamburg TechSource, Santa Fe, New Mexico)
Publication	2005
In:	27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.e-proc. MOPP054
Subject category	Accelerators and Storage Rings
Abstract	Reliable, high-brightness, high-power injector operation is a critical technology issue for energy recovery linac drivers of high-power free electron lasers (FEL). Advanced Energy Systems is involved in three ongoing injector programs that target up to 0.5 Ampere current levels at emittance values consistent with the requirements of the FEL. One is a DC photocathode gun and superconducting RF (SRF) booster cryomodule. A 748.5 MHz injector of this type is being assembled and will be tested up to 100 mA at the Thomas Jefferson National Accelerator Facility (JLAB) beginning in 2007. The second approach being explored is a high-current normal-conducting RF photoinjector. A 700 MHz gun, presently under fabrication, will undergo thermal test in 2006 at Los Alamos National Laboratory (LANL). Finally, a half-cell 703.75 MHz SRF gun is presently being designed and will be tested to 0.5 Ampere at Brookhaven National Laboratory (BNL) in 2007. The status and projected performance for each of these injector projects is presented.