Longitudinal emittance compensation in a photocathode RF gun injector

Author

Wang, X.J. ; Ben-Zvi, I.

Author_Institution

Accel. Test Facility, Brookhaven Nat. Lab., Upton, NY, USA

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

2793

Abstract

Electron beam bunch compression directly from photocathode RF gun injector was experimentally observed at the Brookhaven Accelerator Test Facility (ATF). The analysis is presented in this report shows that, the configuration of transverse space-charge emittance compensation photoinjector can also be operated in bunch length compression mode for modest amount charge (<1.0 nC), i.e., longitudinal emittance compensation. For a constant laser energy, the electron beam bunch length almost linearly decrease with the RF gun phase, and the compression ratio as large as factor of 30 was experimentally observed for a 40 pC charge. We also discuss the effect of electron beam bunching inside the RF gun on the transverse emittance, and compared with experimental results

Keywords

accelerator RF systems; electron accelerators; electron beams; electron guns; electron sources; linear accelerators; particle beam bunching; particle beam injection; photocathodes; space charge; test facilities; ATF; Brookhaven Accelerator Test Facility; compression ratio; constant laser energy; electron beam bunch compression; linac; longitudinal emittance compensation; photocathode RF gun injector; transverse space-charge emittance compensation photoinjector; Cathodes; Electron accelerators; Electron beams; Free electron lasers; Laser modes; Linear particle accelerator; Optical pulses; Radio frequency; Solenoids; Test facilities;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.752768

Filename

752768