Microwave electron gun theory and experiments

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1142680· OSTI ID:5408334

Gao, J ^[1]

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1. FEL Division, Institute of High Energy Physics, Academia Sinica, P.O. 2732, Beijing (China) Laboratoire de L'Accelerateur Lineaire, Batiment 200 91405 Orsay cedex, Orsay (France)

A general microwave electron gun (rf gun) theory and some new ideas about further reducing the emittance of electron beams are reviewed and introduced briefly. Experimental results are presented from a thermionic cathode rf gun which has been developed for Beijing Free-Electron Laser Project (BFELP) at Institute of High Energy Physics (IHEP), Academia Sinica as the injector of 30 MeV constant gradient linac. LaB{sub 6} is used as the thermionic emitter with 100 crystal surface and the temperature around 1620 {degree}C. Back bombardment heating effect and another effect connected with the cathode surface temperature was observed. An electron beam with macropulse length 4 {mu}s, repetition rate 12.5 Hz, greater than 500 mA beam current during macropulse and around 1 MeV maximum energy has been obtained. In the last section of this article, two useful formulas used to determine electric field distribution near the cathode surface and coupling coefficient {beta} of a rf gun are introduced.

• OSTI ID: 5408334
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:1; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

440800* -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
BEAMS
DESIGN
DIODE TUBES
ELECTRON BEAMS
ELECTRON GUNS
ELECTRON TUBES
LEPTON BEAMS
PARTICLE BEAMS
PERFORMANCE
THERMIONIC DIODES
THERMIONIC TUBES