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Dölling, R.

Paper Title Page
PS05 Measurement of the Time-Structure of the 72 MeV Proton Beam in the PSI Injector-2 Cyclotron 111
 
  • R. Dölling
    PSI, Paul Scherrer Institut, Villigen, Switzerland
 
  The time-structure monitor at the last turn of the 72MeV Injector-2 cyclotron has been improved in order to meet the stringent time-resolution requirement imposed by the short bunch length. Protons scattered by a thin carbon-fibre target pass through a first scintillator-photomultiplier detector and are stopped in a second one. The longitudinal bunch shape is given by the distribution of arrival times measured with respect to the 50 MHz reference signal from the acceleration cavities. From a coincidence measurement, the time resolution of the detectors has been determined to be 51 ps and 31 ps fwhm. Longitudinal and horizontal bunch shapes have been measured at beam currents from 25μA to 1700μA. Approximately circular bunches were observed with diameter increasing with current. The shortest observed proton bunch length was 38 ps fwhm.