Photoinjector RF cavity design for high power CW FEL

Author

Kurennoy, S.S. ; Schrage, D.L. ; Wood, R.L. ; Young, L.M. ; Schultheiss, T. ; Christina, V. ; Rathke, J.

Author_Institution

Los Alamos Nat. Lab., NM, USA

Volume

2

fYear

2003

fDate

12-16 May 2003

Firstpage

920

Abstract

The project is under way to develop a key enabling technology for high-power CW FEL: an RF photoinjector capable of producing continuous average current greater than 100 mA. The specific aim is a π-mode, normal-conducting RP photoinjector, 3 nC of bunch charge, 100 mA of current (at 33.3-MHz bunch repetition rate) and emittance less than 10 mm-mrad. This level of performance will enable robust 100-kW-class FEL operation with electron beam energy <100 MeV, thereby reducing the size and cost of the FEL. This design is scalable to the MW power level by increasing the electron bunch repetition rate to a higher value. The major challenges are emittance control and high heat flux within the CW 700-MHz RF cavities. Results of RF cavity design and cooling schemes are presented, including both high-velocity water and liquid-nitrogen cooling options.

Keywords

accelerator RF systems; accelerator cavities; electron beams; free electron lasers; particle beam bunching; particle beam injection; 100 kW; 100 mA; 700 MHz; bunch charge; electron beam energy; electron bunch repetition rate; high-power CW FEL; high-velocity water; liquid-nitrogen cooling; photoinjector RF cavity design; Acceleration; Cathodes; Cooling; Couplings; Electron beams; Magnetic fields; Radio frequency; Shape; Thermal management; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the

ISSN

1063-3928

Print_ISBN

0-7803-7738-9

Type

conf

DOI

10.1109/PAC.2003.1289539

Filename

1289539