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<div>Dear Wu,</div><div><br></div><div style="text-indent: 2em;">What's the laser spot size in your simulation? In 2D cartesian of FLASH, I remember that the length of laser spot in z-axis is 1 cm, which could lead to the laser intensity is much lower than 3D or cylindrical. </div><div><br></div><div>Zhu </div>
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<a class="mail-from" style="color: #3061f2; text-decoration: none" href="mailto:wu1587@purdue.edu">Wu, Yaoxing<wu1587@purdue.edu>
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10/20/2022 11:55
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flash-users@flash.rochester.edu<flash-users@flash.rochester.edu>
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[FLASH-USERS] Significant difference was found in 2d LaserSlab simulation between in cylindrical and cartesian coordiates
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<p class="MsoNormal"><span lang="EN-US">Dear Flash users & developers,</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am having a problem was the simulation in 2D cartesian based on LaserSlab. The “example.par” simulation in LaserSlab is in cylindrical coordiates. I’d like to transfer this simulation to cartesian and hope to get similar
results. However, the electron temperature (Te) in cartesian is lower 1-2 order of magnitude compared to cylindrical (see attached pictures) at same laser spot size, pulse duration and energy. Could you please tell me the reason?</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Because the 3D-in-2D ray trace algorithm can only be used in the cylindrical coordinate, the laser cross section was set to “gaussian1D” in cartesian. Then I think the laser power at a moment should be calculated by a
single integral (shows below):</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><img width="302" height="84" style="width:3.15in;height:.875in" id="Picture_x0020_3" src="cid:image002.png@01D8E47A.B820A5C0"></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The laser energy was checked from the output file “lasslab_LaserEnergyProfile.dat” and was same with the setup in .par file. So I do not know why the Te in 2D cartesian was much lower than that in 2D cylindrical.</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I would appreciate for your any help or suggestions. Thanks.</span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Yaoxing Wu</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:SimSun"><o:p> </o:p></span></p>
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