Speaker
Description
Strong space charge effects in pulsed, high-intensity hydrogen ion beams lead to transport losses in the Low Energy Beam Transport (LEBT) of particle accelerators. The space charge compensation (SCC) process lowers the potential of the beam by trapping compensating particles produced by beam-induced ionisation of residual gas. Significant beam losses during compensation build-up necessitate minimising the SCC time.
Quantifying the SCC time and determining optimal conditions to reduce it can be done using time-resolved diagnostics. An optical diagnostic based on a Multi-Pixel Photon Counter has been developed at ISIS Muon and Neutron Source to measure the beam-induced light emission during SCC. The transmission through the acceptance-limited RFQ, measured by beam current transformers at the entrance and exit, can also be used to determine SCC time. These two diagnostics have been used at ISIS to measure the SCC time of the 35 keV pulsed H- beam during parametric sweeps of residual hydrogen gas pressure, ion source extract voltage, beam current and the solenoid magnet current.
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