5-10 May 2019
MedILS
Europe/Berlin timezone

Axiparabola : a long focal depth mirror for plasma channeling

Not scheduled
15m
MedILS

MedILS

Meštrovićevo šetalište 45 HR – 21000 Split Republic of Croatia

Speaker

Mr Kosta Oubrerie (Laboratoire d'Optique Appliquée)

Description

In Laser-Plasma Accelerators (LPA), an ultra-short laser pulse is focused in a plasma to generate a plasma wave. The electromagnetic fields amplitude generated by this plasma wave are 3 orders of magnitudes higher than those created in classical accelerators. However, for reaching higher energies, the electron beam has to experience these fields on large distances. This remains an issue in LPA due mainly to three phenomenons : pump depletion, laser diffraction and electron dephasing.

We propose a new optical method that could overcome these limits, it is called axiparabola. This optical element will be used to create a plasma channel, which will act as a waveguide for the laser beam. It was inspired by an already existing optical element called axicon. It produces a long focal line by refracting the rays on a different focal position according to their impinging location on the incident surface of the axicon. The axiparabola exploits the same concept, but it uses a reflective component instead of a refractive one. The shape of the plasma channel created can also be controlled by means of a deformable mirror. Indeed, the addition of optical aberrations permits to produce a focal line with different intensity distributions. This technique can be applied to improve the guiding efficiency.

Working group Laser-driven electron acceleration

Primary author

Mr Kosta Oubrerie (Laboratoire d'Optique Appliquée)

Co-authors

Mr Slava Smartsev (Department of Physics of Complex Systems, Weizmann Institute of Science) Mr Cédric Thaury (Laboratoire d'Optique Appliquée)

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