ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A non-interceptive beam neutralization monitor is being used to measure dc H+ beam neutralization properties in the Paul Scherrer Institute's (PSI) 870 keV pre-injector beamline. This transport line uses quadrupole magnetic lenses to transport the H+ beam from the high voltage column to the injection point of the PSI 72 MeV cyclotron. The monitor is a gridded-energy analyzer type, and both positive ion and electron energy distributions are measured. The monitor's energy resolution is measured to be ≈0.9 eV using a 12–30 eV electron gun. Complications in the measured energy distributions−apparently arising from the contaminant H2+ and H3+ beams−are resolved by changing the beam aspect ratio. Collimator biasing and collimator beam scraping have large effects on electron currents. An 870 keV, 8.2 mA dc H+ beam is found to be 10–62% neutralized, depending on the neutralizing gas and density.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1142802
