Title :
The SNS four-phase LEBT chopper
Author :
Staples, J.W. ; Ayers, J.J. ; Cheng, D.W. ; Greer, J.B. ; Hoff, M.D. ; Ratti, A.
Author_Institution :
Lawrence Berkeley Nat. Lab., California Univ., Berkeley, CA, USA
Abstract :
The Spallation Neutron Source front end incorporates a beam chopper in the LEBT that will remove a 295 ns section of beam at a 1.118 MHz rate (65% transmission) with less than 50 ns rise/falltime. The H - beam pulse length is one ms at a 60-Hz rate (6% duty factor). The LEBT is all-electrostatic, and the chopper incorporates four 3-kV solid-state switches driving an einzel lens, split into quadrants, with a 4-phase chopping waveform. The suppressed beam is targeted on a four-segment Faraday cup which provides on-line intensity and steering diagnostics. Results of proton beam tests will be reported
Keywords :
beam handling equipment; ion beams; ion optics; neutron sources; particle beam bunching; particle beam diagnostics; proton beams; 1.118 MHz; 295 ns; 3 kV; 4-phase chopping waveform; 50 ns; 60 Hz; H- beam pulse; SNS four-phase LEBT chopper; Spallation Neutron Source front end; beam chopper; einzel lens; four-segment Faraday cup; on-line intensity; proton beam tests; solid-state switches; steering diagnostics; suppressed beam; Beam steering; Choppers; Electrodes; Lenses; Neutrons; Particle beam injection; Particle beams; Power dissipation; Solid state circuits; Switches;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.794328
