A pulse width modulated picket fence pulser to reduce accelerator start-up transients
- Los Alamos National Laboratory
This paper describes a solid state modulator used to control the input beam to the Los Alamos Neutron Science Center 'LANSCE' 800 MeV accelerator. This electrostatic Ground Level Deflector (GLD) chops the beam after the 750 keV injection energy. Two GLD's are utilized, one for the 'H+' beam and another for the 'H-' beam. These modulators are mounted on the vacuum beam pipe and directly operate sets of deflection plates. To minimize the accelerator beam start up transients, the beam is let into the accelerator cavity structures by a pulse width modulated picket fence operating between 0 and 12 kV. As the deflection plate structure appears as a capacitive load, a totem-pole switching network is utilized to facilitate rise and fall times of {approx}50 ns that is able to sink and source current to minimize beam induced sidewall activation. This paper will describe the system design and provides operational results as now presently utilized on the LANSCE accelerator system.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1024864
- Report Number(s):
- LA-UR-10-04945; LA-UR-10-4945; TRN: US1104810
- Resource Relation:
- Conference: 4th Japan/US Symposium on Pulsed and Plasma Application ; August 5, 2010 ; Honolulu, HI
- Country of Publication:
- United States
- Language:
- English
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