Transformer ratio saturation in a beam-driven wakefield accelerator

Journal Article · Tue Dec 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4938038· OSTI ID:22489956

Farmer, J. P.; Martorelli, R.; Pukhov, A. ^[1]

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1. Institut für Theoretische Physik I, Heinrich Heine Universität, 40225 Düsseldorf (Germany)

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.

• OSTI ID: 22489956
• Journal Information: Physics of Plasmas, Vol. 22, Issue 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ACCELERATION
BEAM BUNCHING
BEAMS
COMPUTERIZED SIMULATION
PLASMA
SATURATION
TRANSFORMATIONS
WAKEFIELD ACCELERATORS