Flat Bunches with a Hollow Distribution for Space Charge Mitigation
  Longitudinally hollow bunches provide one means to mitigate the impact of transverse space charge. The hollow distributions are created via dipolar parametric excitation during acceleration in CERN's Proton Synchrotron Booster. We present simulation work and beam measurements. Particular emphasis is given to the alleviation of space charge effects on the long injection plateau of the downstream Proton Synchrotron machine, which is the main goal of this study. 
Adrian Oeftiger and Hannes Bartosik and Alan James Findlay and Steven   Hancock and Giovanni Rumolo
physics.acc-ph