[FLASH-USERS] Simulation breaks with message "DRIVER_ABORT: ed_beamsCheck2DCyl3D: Quartic root failure for lens!"

[Lu, Yingchao]

Dear Pascal,

The "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.

Best,
Yingchao

From: flash-users <flash-users-bounces at flash.rochester.edu> on behalf of Boller, Pascal <P.Boller at gsi.de>
Date: Monday, June 13, 2022 at 9:26 AM
To: flash-users at flash.rochester.edu <flash-users at flash.rochester.edu>
Subject: [FLASH-USERS] Simulation breaks with message "DRIVER_ABORT: ed_beamsCheck2DCyl3D: Quartic root failure for lens!"
Hi all,

I tried to simulate the laser-matter interaction with copper. In this simulation the laser irradiate the target at 45 deg.
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:
"DRIVER_ABORT: ed_beamsCheck2DCyl3D: Quartic root failure for lens!"
Attached you can find the .par file and the log-file. I pretty much followed the 'LaserSlab' Example provided by Flash.

If someone could help me, I would be very happy.

Best wishes

Pascal Boller
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