Beam phase detectors for spallation neutron source linac

摘要

An ability to measure the beam phase accurately within a fraction of a degree isa requirement to the Spallation Neutron Source(SNS) linac diagnostics. Electromagnetic simulations and measurements have demonstrated a strong dependence of the measured beam phase on the transverse beam position inside a probe, when signals are picked up from individual electrodes. Two candidates for the beam phase detectors for the SNS linac capacitive probes and beam positions monitors, either with signals from individual electrodes or with summed signals are studied and compared using MAFIA simulations with an ultra-relativistic beam.