학술논문
Observation of High Transformer Ratio Plasma Wakefield Acceleration
Document Type
article
Author
Loisch, Gregor; Asova, Galina; Boonpornprasert, Prach; Brinkmann, Reinhard; Chen, Ye; Engel, Johannes; Good, James; Gross, Matthias; Grüner, Florian; Huck, Holger; Kalantaryan, Davit; Krasilnikov, Mikhail; Lishilin, Osip; de la Ossa, Alberto Martinez; Mehrling, Timon J; Melkumyan, David; Oppelt, Anne; Osterhoff, Jens; Qian, Houjun; Renier, Yves; Stephan, Frank; Tenholt, Carmen; Wohlfarth, Valentin; Zhao, Quantang
Source
Physical Review Letters. 121(6)
Subject
Language
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.