Details

Autor(en) / Beteiligte

• Doche, A
• Beekman, C
• Corde, S
• Allen, J M
• Clarke, C I
• Frederico, J
• Gessner, S J
• Green, S Z
• Hogan, M J
• O'Shea, B
• Yakimenko, V
• An, W
• Clayton, C E
• Joshi, C
• Marsh, K A
• Mori, W B
• Vafaei-Najafabadi, N
• Litos, M D
• Adli, E
• Lindstrøm, C A
• Lu, W

Titel

Acceleration of a trailing positron bunch in a plasma wakefield accelerator

Ist Teil von

• Scientific reports, 2017-10, Vol.7 (1), p.14180-7, Article 14180

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2017

Link zum Volltext

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• High gradients of energy gain and high energy efficiency are necessary parameters for compact, cost-efficient and high-energy particle colliders. Plasma Wakefield Accelerators (PWFA) offer both, making them attractive candidates for next-generation colliders. In these devices, a charge-density plasma wave is excited by an ultra-relativistic bunch of charged particles (the drive bunch). The energy in the wave can be extracted by a second bunch (the trailing bunch), as this bunch propagates in the wake of the drive bunch. While a trailing electron bunch was accelerated in a plasma with more than a gigaelectronvolt of energy gain, accelerating a trailing positron bunch in a plasma is much more challenging as the plasma response can be asymmetric for positrons and electrons. We report the demonstration of the energy gain by a distinct trailing positron bunch in a plasma wakefield accelerator, spanning nonlinear to quasi-linear regimes, and unveil the beam loading process underlying the accelerator energy efficiency. A positron bunch is used to drive the plasma wake in the experiment, though the quasi-linear wake structure could as easily be formed by an electron bunch or a laser driver. The results thus mark the first acceleration of a distinct positron bunch in plasma-based particle accelerators.