Speaker
Michal Smid
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.2011.pdf
Generation of low energy electron beams suitable for WDM diagnostics
M. Šmíd1, K. Boháček2, U. Chaulagain2, Y. Gu2, M. Kozlová2 and K. Falk1
1
Helmholtzz-Zentrum Dresden-Rossendorf, Dresden, Germany
2
Institute of Physics, ELI-Beamlines project, Czech Academy of Sciences, Prague, Czech
Republic
One of possible approaches to the diagnostics of Warm Dense Matter is to use a low energy
( ~<1 MeV) electron beam as a backlighter. From the nature of WDM experiment it is suitable
to have this beam produced by laser and to have sufcient brightness to obtain a single shot
diagnostic image for, e.g., electron difraction, which could show the ionic structure of the
matter.
Downramp gradient laser wakefeld acceleration has the capabilities to produce such beams.
This approach relies on focusing the fs laser onto a decreasing density gradient in a gas jet.
We have investigated this approach on the PALS Ti:Saph laser system (Prague) with diferent
types of gas nozzles producing various density profles and gradients. We present the
transition between standard and downramp acceleration regimes and compare this to the result
of relevant PIC simulations. We propose a scheme of magnetic beampath aimed at improving
the beam quality, especially decreasing the beam bandwidth and divergence.
