Fast Particle Tracking With Wake Fields

Details Fast Particle Tracking With Wake Fields Fast Particle Tracking With Wake Fields

2012-01-25

arxiv.org/abs/1201.5270v1

Physics

Accelerator Physics

15 pages, 5 figures

Scientific paper

Tracking calculations of charged particles in electromagnetic fields require in principle the simultaneous solution of the equation of motion and of Maxwell's equations. In many tracking codes a simpler and more efficient approach is used: external fields like that of the accelerating structures are provided as field maps, generated in separate computations and for the calculation of self fields the model of a particle bunch in uniform motion is used. We describe how an externally computed wake function can be approximated by a table of Taylor coefficients and how the wake field kick can be calculated for the particle distribution in a tracking calculation. The integrated kick, representing the effect of a distributed structure, is applied at a discrete time. As an example, we use our approach to calculate the emittance growth of a bunch in an undulator beam pipe due to resitive wall wake field effects.

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