The effects of RF asymmetries on photoinjection beam quality

Author

Rosenzweig, J.B. ; Anderson, S. ; Ding, X. ; Yu, D.

Author_Institution

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

Volume

3

fYear

1999

fDate

1999

Firstpage

2042

Abstract

A general multipole-based formalism to study the effects of RF asymmetries on the production of ultra-high brightness beam is presented, which employs both analytical and computational techniques. These field asymmetries can cause the degradation of beam emittance due to time dependent and nonlinear focusing effects. Two cases of interest are examined: the dipole asymmetry produced by a coupling slot in a standard high gradient RF gun, and the higher multipole content introduced by the support/cooling rods in a PWT structure. Practical implications of our results, as well as comparison to cold test and beam-based experimental tests, are discussed

Keywords

booster injectors; electron accelerators; electron guns; laser beam applications; linear accelerators; particle beam stability; photocathodes; PWT structure; RF asymmetries; beam emittance; dipole asymmetry; multipole content; multipole-based formalism; nonlinear focusing effects; photoinjection beam quality; standard high gradient RF gun; ultra-high brightness beam; Acceleration; Astronomy; Brightness; Cathodes; Degradation; Load flow; Physics computing; Production; Radio frequency; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.794366

Filename

794366