[FLASH-USERS] LaserSlab simulation of a thin target

[Boller, Pascal]

Hi Tomer,

how many grid points does your target have?
From the manual you can find a formula to calculate the resolution. The rule of thumb with 10 grid points across the target thickness Fernando mentioned sounds great.
Please pay attention, that you get multiple grid points across the target thickness for a refinement value of 1. Flash use the refinement of 1 to initialize the box and then increase the amount of grid points according to the parameter refine_max.
To increase the resolution, you have three options:

1.       Decrease your box size

2.       Increase the value nb (in the example I think it was 16) from the setup line of flash

3.       Increase the number of initial blocks (nblock) from the par file.

I hope this will help you.

Best wishes

Pascal

Von: flash-users <flash-users-bounces at flash.rochester.edu> Im Auftrag von Tomer Catabi
Gesendet: Montag, 17. Oktober 2022 21:14
An: Garcia Rubio, Fernando <fgar at lle.rochester.edu>
Cc: flash-users at flash.rochester.edu
Betreff: Re: [FLASH-USERS] LaserSlab simulation of a thin target

Hey Fernando,

Thanks for the reply, I tried increasing the refine variables, increasing the number of rays, and the number of blocks in the simulation and I am still getting the same result. Do you have any other suggestions on how to increase the number of grid points? Am I missing something?

Thank you very much for your help,
Tomer

On Wed, Oct 12, 2022 at 11:27 PM Garcia Rubio, Fernando <fgar at lle.rochester.edu<mailto:fgar at lle.rochester.edu>> wrote:
Hello Tomer,

Seems like you might not have enough grid points in the target. As a rule of thumb, you want to have 10 grid points across the target thickness.

Hope this helps!

Fernando
------------------------------------------
Fernando García Rubio, PhD
Assistant Scientist
Laboratory for Laser Energetics
585-957-1743
------------------------------------------


El 12 oct 2022, a las 11:48, Tomer Catabi <tomercatabi at mail.tau.ac.il<mailto:tomercatabi at mail.tau.ac.il>> escribió:

Hello Flash users and developers,

I am new to FLASH and am trying to make a simulation of laser induced plasma of a thin target (800 nm), similar to the laserslab example.
I have changed the refinement so that the target is visible, but it seems that unlike when running the simulation with a thicker target, the target's thickness is not constant in respect to the 'z' axis. Has anyone encountered this issue before? or maybe someone has an idea of what is the cause of the issue?
I attached a graph of the electron number density on the 'z' axis before the laser interaction in which the issue appears.

Kind regards,
Tomer
<0.0 nsns_1d-Profile_z_El_number_density.png>
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