[FLASH-USERS] Problems with using Laserslab models

[Garcia Rubio, Fernando]

Hi Yanfei,

I can answer for the first question. The xl_boundary _type refers to the axis of symmetry if you run in cylindrical geometry, therefore reflecting is correct.  The direction related to the entrance of the laser is the yl_boundary_type, which should be set to “vacuum”. If your laser is not entering your domain, that might be due to another issue.

As a reminder, if you run the the 2D LaserSlab simulation with the ed_laser3Din2D = .true., the top-bottom direction becomes the Z direction for the laser beam properties. Maybe this is the root of your issues.

Hope this helps,

Fernando
------------------------------------------
Fernando García Rubio, PhD
Assistant Scientist
Laboratory for Laser Energetics
585-957-1743
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El 19 jul 2023, a las 23:18, 胡艳菲 <huyanfeii at 163.com<mailto:huyanfeii at 163.com>> escribió:

Dear Flash users,

I encountered some problems in the simulation of the 3D in 2D Laserslab model based on cylindrical coordinates  and wanted to do plasma simulation in a closed chamber filled with air pressure. The problems encountered are as follows:

1.For the setting of the enclosed chamber, the xyz direction of parameters such as xl_boundary_type is set to reflect, but the laser cannot enter the interior of the chamber. I want to use the ed_ignoreBoundaryCondition_n parameter to make the laser ignore the boundary conditions, but it doesn't work. In this case the laser also cannot enter into the chamber. How to solve this problem?

2. For the setting of the air pressure chamber, even if I set boundary condition in question 1 to outflow enabling laser to enter the chamber, when the chamber density (sim_rhoTarg) is set high, the laser will be completely absorbed by the chamber material and will not reach the target, which is set ms_targZMin = 0.02 while the chamber does not. Is there any parameter that can avoid this problem or is there a problem with my setting?


3. In terms of laser deposition, Flash simulation only considers the reverse bremsstrahlung absorption (free-free) process, I want to add the bound-bound and free-bound process, please tell me what parameters can achieve this function?



Any suggestions on those issues would really help me a lot,

Thank you very much for the help,

All the best,

Yanfei Hu
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