Paper  Title  Page 

WEPPP076  Analysis of Numerical Noise in ParticleInCell Simulations of SingleBunch Transverse Instabilities and Feedback in the CERN SPS  2888 


Funding: Work supported by the USDOE and the USLHC Accelerator Research Program LARP under Contract DEAC0205CH11231. Used resources of NERSC and the Lawrencium cluster at LBNL The operation at high current of the SPS at CERN is limited by transverse SingleBunch instabilities generated by the effect of electron clouds. A model of a high bandwidth feedback control system has been implemented in the macroparticle code WARP to study bunch dynamics and identify system requirements for the efficient damping of singlebunch transverse instability. We analyze the effect of numerical noise and choice of simulation parameters on the modeling of beam dynamics, focusing in particular on the investigation of the feedback system requirements of minimum power to damp the instability and frequency bandwidth given a fixed gain. We report on simulation results and discuss the plans for the future improvements of the feedback model. 
