1. Observation of High Transformer Ratio Plasma Wakefield Acceleration.
- Author
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Loisch G, Asova G, Boonpornprasert P, Brinkmann R, Chen Y, Engel J, Good J, Gross M, Grüner F, Huck H, Kalantaryan D, Krasilnikov M, Lishilin O, de la Ossa AM, Mehrling TJ, Melkumyan D, Oppelt A, Osterhoff J, Qian H, Renier Y, Stephan F, Tenholt C, Wohlfarth V, and Zhao Q
- 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.
- Published
- 2018
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