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P: Fachverband Plasmaphysik

P 9: Theory and Modelling I

P 9.7: Vortrag

Dienstag, 1. März 2016, 16:25–16:40, b305

Transformer Ratio saturation in a beam-driven wakefield accelerator — •John Farmer, Roberto Martorelli, and Alexander Pukhov — Heinerich-Heine-Universität Düsseldorf, 40225 Düsseldorf

We show that for beam-driven wakefield acceleration, the linearly-ramped, equally-spaced train of bunches typically considered to optimise the transformer ratio only works for flat-top bunches. Through theory and simulation, we explain this behaviour is due to the unique properties of the plasma response to a flat-top density profile. Calculations of the optimal scaling for a train of Gaussian bunches show diminishing returns with increasing bunch number, tending towards saturation. For a periodic bunch train, a transformer ratio of 23 was achieved for 50 bunches, rising to 40 for a fully optimised beam.