Observation of High Transformer Ratio Plasma Wakefield Acceleration

Physical Review Letters
Gregor LoischQuantang Zhao

Abstract

Particle-beam-driven plasma wakefield acceleration (PWFA) enables various novel high-gradient techniques for powering future compact light-source and high-energy physics applications. Here, a driving particle bunch excites a wakefield response in a plasma medium, which may rapidly accelerate a trailing witness beam. In this Letter, we present the measurement of ratios of acceleration of the witness bunch to deceleration of the driver bunch, the so-called transformer ratio, significantly exceeding the fundamental theoretical and thus far experimental limit of 2 in a PWFA. An electron bunch with ramped current profile was utilized to accelerate a witness bunch with a transformer ratio of 4.6_{-0.7}^{+2.2} in a plasma with length ∼10  cm, also demonstrating stable transport of driver bunches with lengths on the order of the plasma wavelength.

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Citations

Jun 25, 2019·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·R D'ArcyJ Osterhoff
Jun 25, 2019·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·A Martinez de la OssaU Schramm
Feb 9, 2019·Physical Review Letters·R D'ArcyJ Osterhoff
Nov 27, 2020·Nature Communications·S SchröderJ Osterhoff
Jan 23, 2021·Physical Review Letters·C A LindstrømJ Osterhoff
Aug 21, 2021·Physical Review. E·G J BoyleR D'Arcy

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