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Title: Transformer ratio saturation in a beam-driven wakefield accelerator

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 that 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.
Authors:
; ;  [1]
  1. Institut für Theoretische Physik I, Heinrich Heine Universität, 40225 Düsseldorf (Germany)
Publication Date:
OSTI Identifier:
22489956
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; BEAM BUNCHING; BEAMS; COMPUTERIZED SIMULATION; PLASMA; SATURATION; TRANSFORMATIONS; WAKEFIELD ACCELERATORS