Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.794366
