# 3rd European Advanced Accelerator Concepts Workshop

24-30 September 2017
La Biodola, Isola d'Elba
Europe/Rome timezone

## On the impact of short laser pulses on cold low-density plasmas

26 Sep 2017, 19:12
18m
SML, Sala Maria Luisa, HH

#### SML, Sala Maria Luisa, HH

talk WG1 - Electron Beams from Plasmas

### Speaker

Prof. Gaetano Fiore (Università Federico II, and INFN, Napoli)

### Description

Applying a recently developed plane hydrodynamical model to the impact of a very short and intense laser pulse normally onto a diluted plasma at rest, we determine the motion of the plasma electrons shortly after the beginning of the laser-plasma interaction. We thus analytically derive the main features of the induced wake-field wave in the plasma, when and for which electrons the hydrodynamical description breaks, and strict lower bounds for the electron density n_e well inside the plasma (in particular, n_e>n_0/2 if the initial one n_0 was uniform). Since in reality the laser spot size R is finite, we suggest that a ion bubble can form uniquely at the vacuum plasma interface, it can propagate behind the pulse only if $R,n_0$ are sufficiently small, while for slightly larger R,n_0 the slingshot effect (i.e. the backward expulsion of hig-energy electrons from the plasma) may occur. In our model we reduce the Lorentz-Maxwell and continuity PDEs to decoupled systems of nonautonomous 1-dim Hamilton equations adopting u=ct-z instead of time t as an independent variable in the Action, Lagrangian and Hamiltonian.

### Primary author

Prof. Gaetano Fiore (Università Federico II, and INFN, Napoli)

### Presentation Materials

 Slides
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