[FLASH-USERS] Model resonant laser absorption at critical density

[Reyes, Adam]

Hi Leonard,

There isn’t a capability existing in FLASH to do what you describe, but it shouldn’t be too difficult to implement. You could implement a modification of the inverse Bremsstrahlung rate that should accomplish what you want (if I’ve understood you correctly). You can copy "source/physics/sourceTerms/EnergyDeposition/EnergyDepositionMain/Laser/LaserUtilities/ed_inverseBremsstrahlungRate.F90” into your simulation directory and customize it to your heart’s desire.

I would be interested to know if you’re able to find success with something like this!

*********************************************
Adam Reyes


Code Group Leader, Flash Center for Computational Science  
Research Scientist, Dept. of Physics and Astronomy
University of Rochester
River Campus: Bausch and Lomb Hall, 369  
500 Wilson Blvd. PO Box 270171, Rochester, NY 14627
Email adam.reyes at rochester.edu
Web https://flash.rochester.edu
 (he / him / his)


*********************************************



> On Apr 29, 2024, at 11:59 AM, Wegert, Leonard <L.Wegert at gsi.de> wrote:
> 
> Hi FLASH users!
> 
> I'm trying to model the interaction of a very short laser pulse (100 fs, 1e16 W/cm^2) with a solid Titanium target. As expected, the target's sharp edge reflects nearly all of the laser's energy and nothing happens. 
> Does anyone have experiences on how to model the interaction of short laser pulses with solid targets in FLASH? (Properly model the laser prepulse, introduce a thin area of lower density, play around with the minimum ionization level?)
> Codes like MULTI-fs try to implement resonant absorption by introducing a parameter, that specifies the fraction of energy that is absorbed at the critical density (instead of reflecting everything). Are there ambitions to introduce a similar parameter for FLASH (Or is there already one and I just didn't find it?)?
> 
> I'm looking forward to hear from your experiences.
> 
> Cheers,
> 
> Leonard Wegert
> GSI Helmholtzzentrum für Schwerionenforschung GmbH
> Plasma Physics Department
> l.wegert at gsi.de
> 
> 
> 
> 
> 
> 
> 
> 
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