[FLASH-USERS] Setting minimum ionization level in LaserSlab

[Hansen, Eddie]

Hi Hyungyu,

I think the choice is up to you. Critical density for 1053 nm is around 1.e21 1/cc, so yes with <Z> = 0.02, the initial ne is slightly above at 1.21e23 1/cc. I believe this choice was simply to get a good amount of absorption right away.

The Al will heat up quickly. To get to ne ~ 1.e23 1/cc requires a relatively small amount of ionization to <Z> = 1.7, which typically corresponds to around 18 eV.

So you can try initializing with ZMin = 1.7. If the Al heats up quickly, the results should not be too different.

--
Eddie Hansen
Research Scientist
Flash Center for Computational Science


From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of 유현규 <hgyu1996 at gm.gist.ac.kr>
Date: Friday, June 23, 2023 at 10:14 AM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] Setting minimum ionization level in LaserSlab
Dear Flash developers and users,

I am working on the simulation of laser-induced ablation of Al target using mtmmmt EOS provided by FLASH.

According to documents, the minimum ionization level ms_targZmin in LaserSlab must be set to the value larger than value corresponds to critical density. In the example.par file, the ms_targZmin is set to 0.02, which corresponds to around critical density of 1053nm (1.205e+21 1/cc) in .par file.

However, the initial electron density of the target is generally set to free electron density (order of 1e+23 1/cc) in the other hydrodynamics simulations such as HYDRA or HELIOS.

Do I have to set ms_targZmin as corresponding value of free electron density of Al when using mtmmmt?

Is the value of ms_targZmin provided by example.par physically not correct?





Regards,

Hyungyu Yu
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