Title :
H- ion source development for the National Spallation Neutron Source
Author :
Leitner, M.A. ; Gough, R.A. ; Leung, K.N. ; Rickard, M.L. ; Wengrow, A.B. ; Williams, M.D. ; Wutte, D.C.
Author_Institution :
Ernest Orlando Berkely Nat. Lab., California Univ., Berkeley, CA, USA
Abstract :
The ion source for the 1 MW National Spallation Neutron Source (NSNS) is required to provide 35 mA of H- beam current (1 ms pulses at 60 Hz) at 65 keV with a normalized RMS emittance of less than 0.2 pi mm mrad. The same ion source should be able to produce 70 mA of H - at 6% duty factor when the NSNS is upgraded to 2 MW of power. For this application, a radio-frequency driven, magnetically filtered multicusp source is now being developed at LBNL. In preliminary experiments with an existing ion source developed for the Superconducting Super Collider, 15 mA of H- ions were extracted at an accelerated voltage of 10 kV and an RF output power of 20 kW without cesium. The design of a new source equipped with a cesium dispenser collar, a fast ion beam pre-chopper (rise times <100 ns) and a strong permanent-magnet insert for electron deflection will be presented
Keywords :
beam choppers; hydrogen ions; ion sources; negative ions; neutron sources; permanent magnets; 1 MW; 10 kV; 15 mA; 2 MW; 20 kW; 35 mA; 60 Hz; 65 keV; 70 mA; H; H- ion source; NSNS; National Spallation Neutron Source; electron deflection; fast ion beam prechopper; magnetically filtered multicusp source; permanent-magnet insert; Acceleration; Ion beams; Ion sources; Magnetic separation; Neutrons; Power generation; Radio frequency; Superconducting filters; Superconducting magnets; Voltage;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.752756
