Three electron beams from a laser-plasma wakefield accelerator and the energy apportioning question
| Autor: | Gregor H. Welsh, S. M. Wiggins, D. W. Grant, Bernhard Ersfeld, Feiyu Li, D. Reboredo Gil, M. R. Islam, Enrico Brunetti, Matthew P. Tooley, X. Yang, Zheng-Ming Sheng, Dino A. Jaroszynski, Gregory Vieux, P. A. Grant, Silvia Cipiccia |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Electron 01 natural sciences 7. Clean energy Article 010305 fluids & plasmas law.invention Optics law Electric field 0103 physical sciences Coordination and Communication [13.1] 010306 general physics QC Multidisciplinary business.industry Plasma Plasma acceleration Laser Accelerators and Storage Rings Novel Acceleration Techniques (ANAC2) [13] Cathode ray Physics::Accelerator Physics Laser beam quality business Beam (structure) |
| Zdroj: | Scientific Reports Sci. Rep., (2017) pp. 43910 |
| ISSN: | 2045-2322 |
| Popis: | Laser-wakefield accelerators are compact devices capable of delivering ultra-short electron bunches with pC-level charge and MeV-GeV energy by exploiting the ultra-high electric fields arising from the interaction of intense laser pulses with plasma. We show experimentally and through numerical simulations that a high-energy electron beam is produced simultaneously with two stable lower-energy beams that are ejected in oblique and counter-propagating directions, typically carrying off 5–10% of the initial laser energy. A MeV, 10s nC oblique beam is ejected in a 30°–60° hollow cone, which is filled with more energetic electrons determined by the injection dynamics. A nC-level, 100s keV backward-directed beam is mainly produced at the leading edge of the plasma column. We discuss the apportioning of absorbed laser energy amongst the three beams. Knowledge of the distribution of laser energy and electron beam charge, which determine the overall efficiency, is important for various applications of laser-wakefield accelerators, including the development of staged high-energy accelerators. |
| Databáze: | OpenAIRE |
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