CERN Accelerating science

Article
Title	State-of-the-Art Electron Guns and Injector Designs for Energy Recovery Linacs (ERL)
Author(s)	Todd, Alan ; Ambrosio, Anthony ; Ben-Zvi, Ilan ; Benson, Stephen V ; Blüm, Hans ; Burrill, Andrew ; Calaga, Rama ; Cameron, Peter ; Campisi, Isidoro E ; Chang, Xiangyun ; Christina, Vincent ; Cole, Michael ; Colestock, Patrick L ; Daly, Edward ; Douglas, David ; Dylla, Fred H ; Falletta, Michael ; Hahn, Harald ; Hernandez-Garcia, Carlos ; Hogan, John ; Holmes, Douglas ; Janssen, Dietmar ; Kayran, Dmitry ; Kelley, John P ; Kewisch, Jorg ; Kneisel, Peter ; Kurennoy, Sergey ; Lewellen, John W ; Litvinenko, Vladimir N ; Mammosser, John ; McIntyre, Gary ; Neil, George R ; Nguyen, Dinh C ; Nicoletti, Tony ; Peterson, Ed ; Phillips, Larry ; Preble, Joseph P ; Rank, Jim ; Rao, Triveni ; Rathke, John ; Reass, William ; Rees, Daniel ; Rimmer, Robert ; Rode, Claus ; Russell, Steven ; Scaduto, Joseph ; Schrage, Dale L ; Schultheiss, Tom ; Sekutowicz, Jacek ; Siggins, Tim ; Warren Funk, L ; Whitlach, Timothy ; Wiseman, Mark ; Wong, Robert ; Wood, Richard L ; Wu, Kuo-Chen ; Young, Lloyd M ; Zaltsman, Alex ; Zhao, Yongxiang
Affiliation	(AES, Medford, NY) ; (AES, Princeton, New Jersey) ; (ANL, Argonne, Illinois) ; (BNL, Upton, Long Island, New York) ; (DESY, Hamburg) ; (ERL) ; (FZR, Dresden) ; (Jefferson Lab, Newport News, Virginia) ; (LANL, Los Alamos, New Mexico) ; (LANL/LANSCE, Los Alamos, New Mexico) ; (ORNL/SNS, Oak Ridge, Tennessee) ; (TechSource, Santa Fe, New Mexico)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.2292
Subject category	Accelerators and Storage Rings
Abstract	A key technology issue of ERL devices for high-power free-electron laser (FEL) and 4th generation light sources is the demonstration of reliable, high-brightness, high-power injector operation. Ongoing programs that target up to 1 Ampere injector performance at emittance values consistent with the requirements of these applications are described. We consider that there are three possible approaches that could deliver the required performance. The first is a DC photocathode gun and superconducting RF (SRF) booster cryomodule. Such a 750 MHz device is being integrated and will be tested up to 100 mA at the Thomas Jefferson National Accelerator Facility beginning in 2007. The second approach is a high-current normal-conducting RF photoinjector. A 700 MHz gun will undergo thermal test in 2006 at the Los Alamos National Laboratory, which, if successful, when equipped with a suitable cathode, would be capable of 1 Ampere operation. The last option is an SRF gun. A half-cell 703 MHz SRF gun capable of delivering 1.0 Ampere will be tested to 0.5 Ampere at the Brookhaven National Laboratory in 2006. The fabrication status, schedule and projected performance for each of these state-of-the-art injector programs will be presented.