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Phys Rev Lett. 2018 Aug 10;121(6):064801. doi: 10.1103/PhysRevLett.121.064801.

Observation of High Transformer Ratio Plasma Wakefield Acceleration.

Author information

1
Deutsches Elektronen-Synchrotron DESY, 15738 Zeuthen, Germany.
2
INRNE, BAS, 1784 Sofia, Bulgaria.
3
Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany.
4
Universität Hamburg, 22761 Hamburg, Germany.
5
Center for Free-Electron Laser Science, 22607 Hamburg, Germany.
6
CERN, 1211 Geneva, Switzerland.

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.

PMID:
30141672
DOI:
10.1103/PhysRevLett.121.064801
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