Ring-shaped electron beams from laser-wakefield accelerator

0551575 - FZÚ 2022 RIV US eng C - Conference Paper (international conference)
Valenta, Petr - Grittani, Gabriele Maria - Lazzarini, Carlo Maria - Klimo, Ondřej - Bulanov, Sergey V.
Ring-shaped electron beams from laser-wakefield accelerator.
Laser Acceleration of Electrons, Protons, and Ions VI. Bellingham: SPIE, 2021, s. 1-9, č. článku 1177909. Proceedings of SPIE, 11779. ISBN 978-1-5106-4392-5. ISSN 0277-786X.
[Laser Acceleration of Electrons, Protons, and Ions VI. online (CZ), 19.04.2021-30.04.2021]
R&D Projects: GA MŠMT EF15_003/0000449; GA MŠMT EF16_019/0000789; GA MŠMT LQ1606
Grant - others:OP VVV - HiFi(XE) CZ.02.1.01/0.0/0.0/15_003/0000449; OP VVV - ADONIS(XE) CZ.02.1.01/0.0/0.0/16_019/0000789; Ga MŠk(CZ) LM2015070
Research Infrastructure: ELI Beamlines III - 90141
Institutional support: RVO:68378271
Keywords : laser-plasma interaction * laser-wakefield acceleration * Langmuir waves * electron rings
OECD category: Optics (including laser optics and quantum optics)
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11779/1177909/Ring-shaped-electron-beams-from-laser-wakefield-accelerator/10.1117/12.2589222.short?SSO=1

Using analytical methods and computer simulations, we investigate physical processes which lead to the formation of ring-shaped electromagnetic and electron structures in laser-plasma interaction. We observe that as the intense laser pulse excites a nonlinear Langmuir wave in an underdense plasmas, a significant portion of the pulse is refracted outwards the propagation direction due to the interactions with thin, high-density electron walls surrounding the wave cavities. Because of the radial symmetry, the refracted light forms a distinct electromagnetic ring that encircles the driver pulse. The efficiency of the energy transfer to the electromagnetic ring is relatively high, so that the ring can generate its own Langmuir wave and trigger the electron self-injection, which results in a ring-shaped beam of high-energy electrons. The properties of the ring-shaped electromagnetic and electron beams depend on the parameters of the Langmuir wave cavity walls, thus they can be controlled by tuning the parameters of the laser and plasma. The ring structures could be applied as a drivers for acceleration of positively charged particles, or as a diagnostic to determine regimes and the overall efficiency of the laser-wakefield accelerator.
Permanent Link: http://hdl.handle.net/11104/0326897