[FLASH-USERS] Unexpectedly Low Zbar Values Despite High Ion Temperatures - EOS Problem

[Owen Bardeen]

What's even more off is I have ms_targZmin set to .02 in my .par file. I'm
very confused as to why my initial ionization is even lower than this (by
about 2 orders of magnitude).

On Wed, Jul 30, 2025 at 1:55 PM Owen Bardeen <owenbardeen at gmail.com> wrote:

> Hello all,
>
> I'm encountering an issue with Zbar values in my FLASH simulation and
> would appreciate any help.
>
> I've set up a LaserSlab simulation with a spherical target. When I check
> the output files, plotting tion, nion, and average ionization (determined
> as ye/sumy according to page 587 of the user manual), I see average
> ionization is orders of magnitude different from what I expect from looking
> at the EOS tables (checking the Zbar corresponding to the tion and nion I
> see in my output) I give to FLASH.
>
> I've confirmed that:
>
>    -
>
>    The Zbar values in the table are physically reasonable.
>    -
>
>    Ion temperature and density in the relevant regions match the expected
>    range.
>    -
>
>    I'm plotting Zbar from the simulation’s checkpoint or plot files, not
>    the raw EOS data.
>
> I’m wondering if this might be due to:
>
>    -
>
>    FLASH not reading or using the Zbar in my IONMIX properly?
>    -
>
>    Something I'm missing with differences in the units?
>    -
>
>    Weird interpolation of Zbar done by FLASH?
>
> If anyone has experience debugging EOS/Zbar behavior in FLASH, I’d be
> grateful for any suggestions.
>
> For reference, I am using the LaserSlab module, FLASH4.7.1. My EOS tables
> are generated using Propaceos software.
>
> Thanks in advance for your help,
> Owen
>
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