Thermionic RF gun with high duty factor

Author

Mitrochenko, V.V.

Author_Institution

NSC KIPT, Kharkov, Ukraine

Volume

3

fYear

1997

fDate

12-16 May 1997

Firstpage

2817

Abstract

Back bombarding limits wide usage of thermionic RF guns. The article presents one of the possible field distribution on-axis of an RF gun, which allows to reduce back bombarding power of a cathode. Simulation predicts 20 kW of pulsed back bombarding power on the LaB₆ cathode under 0.51 A of output current and 0.908 MeV of maximum energy of the electrons. The average current can be increased until the average power of back bombarding reaches the initial filament power of a cathode. Therefore it is expected to reach at least 0.5 mA of the average output current. The energy spectrum and bunch phase length are suitable to inject the beam directly into the accelerator structure with the phase velocity equal to the velocity of light. The ramp of the cathode temperature during the RF pulse and the long time stability of the output current are discussed

Keywords

electron guns; electron sources; particle beam bunching; thermionic cathodes; 0.908 MeV; 20 kW; LaB₆; LaB₆ cathode; RF pulse; average current; average output current; average power; back bombarding power; bunch phase length; cathode; cathode temperature; energy spectrum; high duty factor; output current; phase velocity; thermionic RF gun; Acceleration; Cathodes; Electron beams; Electron emission; Electron guns; Linear accelerators; Particle beams; Predictive models; Radio frequency; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.752776

Filename

752776