High power testing of a 17 GHz photocathode RF gun

Author

Chen, S.C. ; Danly, B.G. ; Gonichon, J. ; Lin, C.L. ; Temkin, R.J. ; Trotz, S.R. ; Wurtele, J.S.

Author_Institution

Plasma Fusion Center, MIT, Cambridge, MA, USA

Volume

2

fYear

1995

fDate

1-5 May 1995

Firstpage

893

Abstract

We report experimental high power test results on a high gradient 17 GHz RF photocathode gun. The 1½ cell, π-mode, copper cavity was tested with 5-10 MW, 100 ns, 17.145 GHz pulses from a 24 M W Haimson Research Corp. klystron. A maximum surface electric field of 250 MeV/m was achieved corresponding to an on-axis gradient of 150 MeV/m. The gradient was verified by a preliminary electron beam energy measurement. Conditioning with ~10⁵ shots resulted in a low field emission current, less than 6 mA. Future research will concentrate on measurements of the quality of electron beams produced by ps laser photoemission

Keywords

accelerator RF systems; accelerator cavities; electron field emission; electron guns; electron sources; klystrons; particle beam diagnostics; particle sources; photocathodes; 1½ cell π-mode cavity; 17 GHz; 17.145 GHz; 24 MW; 5 to 10 MW; 6 mA; Cu; conditioning; electron beam energy measurement; electron beams quality; high gradient; high power testing; klystron; low field emission current; maximum surface electric field; on-axis gradient; photocathode RF gun; picosecond laser photoemission; Cathodes; Electric breakdown; Electron beams; Klystrons; Laser modes; Pulse amplifiers; Pump lasers; Radio frequency; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505073

Filename

505073