Emittance measurements of the 4.5 MeV UCLA RF photoinjector

Author

Hartman, S.C. ; Barov, N. ; Park, S. ; Pellegrini, C. ; Rosenzweig, J. ; Travish, G. ; Zhang, R. ; Davis, P. ; Joshi, C. ; Hairapetian, G.

Author_Institution

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

fYear

1993

fDate

17-20 May 1993

Firstpage

561

Abstract

The 1.5 cell RF photoinjector has been operated for the past several months using a copper cathode illuminated by 4 ps long pulses of UV (246 nm light, with a variable energy of between 0 to 300 μJ. This typically produces up to 3 nC of charge per bunch. Because space charge forces dominate the electron beam transport a pepper pot measurement system is used to measure the emittance. The emittance is measured as a function of charge, peak accelerating field, laser spot size and initial phase with respect to the RF field. This is accomplished with an automated control and data acquisition system which can measure single shot emittances at a rate of 5 Hz developed at UCLA. The experimental results obtained are then compared with theory and simulations

Keywords

collective accelerators; laser beam applications; particle beam diagnostics; photocathodes; 266 nm; 4.5 MeV; UCLA RF photo-injector; accelerating field; automated control and data acquisition system; electron beam transport; emittance measurements; pepper pot measurement system; single shot emittances; space charge forces; standing wave accelerator; Cathodes; Charge measurement; Copper; Current measurement; Electron beams; Force measurement; Phase measurement; Radio frequency; Size measurement; Space charge;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.308852

Filename

308852