[FLASH-USERS] laser setup in cylindrical geometry

[kfang]

Hi, everyone:


My simulation is using one laser beam irradiate on a spherical shell, and this laser beam have a 45 degree angle to x-axis. I used the cylindrical geometry, and from the output hdf5 files, I found that the intensity of laser is not symmetrically on the surface of the shell. But when i used the cartesian geometry with same 45 degree incident laser, the intensity on the shell is uniform and symmetrically. 


I guess here are some problems when i'm seting up the laser beam. My laser setup in the .par file is as follows:


useEnergyDeposition = .true.
ed_maxRayCount      = 20000
ed_gradOrder        = 2


# Activate 3D-in-2D ray trace:
ed_laser3Din2D           = .true.
ed_laser3Din2DwedgeAngle = 0.1


### LASER IO OPTIONS ###
ed_useLaserIO                  = .true.
ed_laserIOMaxNumberOfPositions = 10000
ed_laserIOMaxNumberOfRays      = 128


### SETUP LASER PULSES ###
ed_numberOfPulses = 1				


# Define Pulse 1:
ed_numberOfSections_1 = 4	


ed_time_1_1  = 0.0
ed_time_1_2  = 0.01e-09
ed_time_1_3  = 0.50e-09
ed_time_1_4  = 0.51e-09


ed_power_1_1 = 0.0
ed_power_1_2 = 1.52e+012
ed_power_1_3 = 1.52e+012
ed_power_1_4 = 0.0




### SETUP LASER BEAM ###
ed_numberOfBeams = 1


# Setup Gaussian Beam:


ed_lensX_1                    =  10.0	
ed_lensZ_1                    =  10.0
ed_lensY_1                    =  0.0
ed_lensSemiAxisMajor_1        =  3.0e-01


ed_targetX_1                  =  212.0e-04
ed_targetZ_1                  =  212.0e-04
ed_targetY_1                  =  0.0


ed_targetSemiAxisMajor_1      =  225.0e-04
ed_targetSemiAxisMinor_1      =  225.0e-04


ed_pulseNumber_1              =  1
ed_wavelength_1               =  0.351
ed_crossSectionFunctionType_1 = "gaussian2D"
ed_gaussianExponent_1         =  4.0
ed_gaussianRadiusMajor_1      =  212e-04
ed_gaussianRadiusMinor_1      =  212e-04
ed_numberOfRays_1             =  4096
ed_gridType_1                 = "radial2D"
ed_gridnRadialTics_1          =  64
ed_semiAxisMajorTorsionAngle_1=  0.0
ed_semiAxisMajorTorsionAxis_1 = "x"





And in mesh parameters:
geometry = "cylindrical"	 


And, this shell is a hollow spherical shell with outer radius 300 microns and inner radius 150 microns.


So, what should i do to let the intensity of the laser on the shell to be symmetrically to the 45 degree incident axis?  


Thank you for your attention and help !


Best regards,



Ke Fang


phd student
Chinese Academy of Sciences
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