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<p class="MsoNormal"><span style="font-size:11.0pt">Dear Pascal,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The "</span><span style="font-size:11.0pt">Quartic root failure for lens" error is due to the round-off error in solving the intersection points between the lens and the simulation boundary. A quick dirty
way to fix it is to change ed_semiAxisMajorTorsionAxis_1 to "y" or "z". Since SemiAxisMajor and SemiAxisMinor are the same in your setup, it should not matter which torsion axis should be used.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Yingchao</span><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">flash-users <flash-users-bounces@flash.rochester.edu> on behalf of Boller, Pascal <P.Boller@gsi.de><br>
<b>Date: </b>Monday, June 13, 2022 at 9:26 AM<br>
<b>To: </b>flash-users@flash.rochester.edu <flash-users@flash.rochester.edu><br>
<b>Subject: </b>[FLASH-USERS] Simulation breaks with message "DRIVER_ABORT: ed_beamsCheck2DCyl3D: Quartic root failure for lens!"<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi all,<br>
<br>
I tried to simulate the laser-matter interaction with copper. In this simulation the laser irradiate the target at 45 deg.<br>
However the simulation breaks (almost at the beginning of the simulation) and I have no idea how to fix this. In the log-file I get the message:<br>
"DRIVER_ABORT: ed_beamsCheck2DCyl3D: Quartic root failure for lens!"<br>
Attached you can find the .par file and the log-file. I pretty much followed the 'LaserSlab' Example provided by Flash.<br>
<br>
If someone could help me, I would be very happy.<br>
<br>
Best wishes<br>
<br>
Pascal Boller<o:p></o:p></span></p>
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