Flat-beam RF photocathode sources for linear collider applications

Author

Rosenzweig, J.B.

Author_Institution

Dept. of Phys., California Univ., Los Angeles, CA, USA

fYear

1991

fDate

6-9 May 1991

Firstpage

1987

Abstract

Laser-driven RF photocathodes represent a recent advance in high-brightness electron beam sources. The author investigates a variation on these devices that was obtained by using a ribbon laser pulse to illuminate the cathode, yielding a flat beam ( sigma /sub x/>> sigma /sub y/) which has asymmetric emittances at the cathode proportional to the beam size in each transverse dimension. The flat-beam geometry mitigates space charge forces which lead to intensity-dependent transverse and longitudinal emittance growth, thus limiting the beam brightness. The fundamental limit on achievable emittance and brightness is set by the transverse momentum distribution and peak current density of the photoelectrons.<>

Keywords

electron accelerators; electron sources; linear accelerators; photocathodes; RF photocathode sources; asymmetric emittances; beam brightness; beam size; flat beam; high-brightness electron beam sources; linear collider; longitudinal emittance growth; peak current density; ribbon laser pulse; space charge forces; transverse dimension; Brightness; Cathodes; Current density; Electron beams; Geometrical optics; Laser applications; Laser beams; Optical pulses; Radio frequency; Space charge;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE

Conference_Location

San Francisco, CA, USA

Print_ISBN

0-7803-0135-8

Type

conf

DOI

10.1109/PAC.1991.164845

Filename

164845