Hi Danila,

the LWFA example is a bit rought, too close to the border, has a
unrealistic few-cycle laser pulse (5fs!), etc., which can heavily
influence the formation of the bubble. But still:

what you see is a rather random snapshot from some plane position at
some random time of the wake. To get a better picture, read the density
from the HDF5 output and vary the plane along y. Also, better take a
longer pulse.

Does that result in a more physical picture then? :)


Best,
Axel

On 13.01.2017 16:46, Khikhlukha Danila wrote:
> Dear all,
> I've noticed a strange electron density asymmetry on the pictures
> provided by the pngModule.
>
> As an example I'm using PoG 0.2.1 standard LWFA example with all default
> settings.  The computational grid is specified like `TBG_gridSize="-g
> 128 256 128"` with no moving window. I have noticed that the shape of
> the wake wave is not circular in the transversal direction. Please find
> a picture attached to illustrate the issue.
> It looks a bit strange to me as the laser pulse has a circular
> polarization and grid size/step are the same in both transversal
> directions. This "rectangular" shape of the wake wave puzzles me a bit...
>
> Best regards,
> Danila.
>
>
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--

Axel Huebl
Phone +49 351 260 3582
https://www.hzdr.de/crp
Computational Radiation Physics
Laser Particle Acceleration Division
Helmholtz-Zentrum Dresden - Rossendorf e.V.

Bautzner Landstrasse 400, 01328 Dresden
POB 510119, D-01314 Dresden
Vorstand: Prof. Dr.Dr.h.c. R. Sauerbrey
          Prof. Dr.Dr.h.c. P. Joehnk
VR 1693 beim Amtsgericht Dresden