High-current, high-duty-factor experiments with the H ion source for the Spallation Neutron Source

Author

Leitner, M.A. ; Cheng, D.W. ; Gough, R.A. ; Keller, R. ; Leung, K.N. ; Mukherjee, S.K. ; Scott, P.K. ; Williams, M.D.

Author_Institution

Lawrence Berkeley Lab., CA, USA

Volume

3

fYear

1999

fDate

1999

Firstpage

1911

Abstract

The ion source for the 1 MW Spallation Neutron Source (SNS) is required to provide 35 mA of H^- beam current at 6% duty factor (1 ms pulses at 60 Hz) with a normalized rms emittance less than 0.15 π mm mrad. The H^- beam will be accelerated to 65 keV and matched into a 2.5 MeV RFQ. The ion source is expected to ultimately produce 70 mA of H^- at 6% duty factor when the SNS is upgraded to 2 MW of power. For this application, a radio-frequency driven, magnetically filtered multicusp source is being developed at Berkeley Lab. The design of this new ion source is directed towards operation at the required high duty factor. Experimental results of the ion source operated in pure volume production mode (without cesium) and in hybrid mode (with cesium released into the source) are compared. An improved cesium dispensing system is presented

Keywords

caesium; ion sources; 35 mA; 60 Hz; 65 keV to 2.5 MeV; Cs; H; H ion source; H^- beam current; Spallation Neutron Source; cesium dispensing system; high-duty-factor experiments; hybrid mode; normalized rms emittance; pure volume production mode; radiofrequency driven magnetically filtered multicusp source; Electrodes; Electrons; Filters; Ion sources; Magnetic separation; Magnets; Neutrons; Plasma confinement; Plasma sources; Radio frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.794311

Filename

794311