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<div class="BodyFragment"><font size="2"><span style="font-size: 11pt;">
<div class="PlainText">Dear FLASH users,<br>
<br>
I am trying to simulate a laser-solid tin target interaction scenario starting from LaserSlab and modifying only a few parameters (using 2D cartesian geometry, using solid tin slab and He chamber filling, modifying laser parameters, etc, please see flash.par
and log file for details).<br>
<br>
Throughout the first few nanoseconds, the evolution looks as expected (electron density normalized to critical density, laser power deposition [erg/s/cm^3], electron/ion/radiation temperatures [eV], fluid speed along x [km/s]):<br>
<br>
</div>
</span></font></div>
<div><img alt="tin_180.png" src="cid:21EBFBFF-EA1C-489D-A0E5-6C33BBC95204"></div>
<div class="BodyFragment"><font size="2"><span style="font-size: 11pt;">
<div class="PlainText"><br>
However, later on, at around ~7 ns into the simulation, I start to observe weird behavior in Trad -unexpected rapid growth of Trad around the laser spot & target-chamber interface, with irregular spatial structures, which persists even when the laser is turned
off (at 10.1 ns); it eventually leads to strong target front heating after the laser pulse is gone, which seems unphysical to me. Here is what I observe at 8.2 ns and later on at 32 ns:<br>
<br>
</div>
</span></font></div>
<div><img alt="tin_280.png" src="cid:A476217E-A4A6-46A2-B81C-C7E199C8E25D"><img alt="tin_500.png" src="cid:E7FF6BB8-6C8B-4CE2-83A0-C4BC06C1525B"></div>
<div class="BodyFragment">
<div class="PlainText" style="font-size: 11pt;"><br>
<br>
I suspect that such unphysical target evaporation may be caused by the failure of RadTrans module to converge - I think I also confirm it by turning off RadTrans in flash.par before the “failure” and running further without radiation transport/opacities, without
any notable problems with target evaporation. At the same time, I haven’t seen any warning/error messages related to radiation transport in log file.<br>
<br>
I’d really appreciate suggestions about how to make RadTrans module converge, or any other suggestions about what could cause such a problem. Thanks!<br>
<br>
Sincerely yours,<br>
Kirill Lezhnin<br>
</div>
<div class="PlainText" style="font-size: 11pt;"><br>
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<div class="PlainText"><span style="font-size: 14.666667px;">
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