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<div>Dear Wu,</div><div> As shown in this figure, the cell volume of laser beam is deltX * 1cm * 1cm in 1D cartesian simulation, and in 2D cartesian, it is deltX * deltY * 1cm, so the laser intensity is not the same as the 3D cylindrical laser beam. You can set the ed_adjustBeamsTargetIntensity as .true. to modify this intensity. I hope this message can help you.</div><div><br></div><div>Zhu</div>
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<div style="font-size:12px;line-height:1.6;word-break:break-all;margin-left:10px;margin-right:10px">On <span class="mail-date">10/21/2022 09:44</span>，<a class="mail-to" style="text-decoration:none;color:#2a83f2;" href="mailto:wu1587@purdue.edu">Wu, Yaoxing<wu1587@purdue.edu></a> wrote： </div>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Dear Zhu,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Thanks for your message. The laser spot size is 20 um (ed_targetSemiAxisMajor_1 = 10e-04), and it seems the spot size can only be adjusted by this variable regardless of coordinates.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">In my opinion, the variables with labeled “Z” represent the Y direction in the R-z geometry (cylindrical coordinates), while the variables with labeled “Y” are not used.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">However, in cartesian coordinates, the variables with labeled “Y” represent the Y direction, while the variables with labeled “Z” are not used. So I replaced the variables labeled “Z” in cylindrical
with “Y” in cartesian coordinates. Below is the laser parameter details in cartesian coordinates (variables labeled “Z” have been commented):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><img width="394" height="350" style="width:4.1in;height:3.65in" id="Picture_x0020_7" src="cid:image003.png@01D8E530.F37D3690"></span><span lang="EN-US" style="font-size:12.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Could you please tell me how to give a correct conversion for laser parameters from 2D cylindrical to cartesian coordinates?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Thanks again for your help. I would appreciate any suggestions or help.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt">Yaoxing Wu<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">
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<p class="MsoNormal" style="border:none;padding:0cm"><b><span lang="EN-US">From: </span>
</b><span lang="EN-US"><a href="mailto:leizhuray@pku.edu.cn">leizhuray</a><br>
<b>Sent: </b>2022</span>年<span lang="EN-US">10</span>月<span lang="EN-US">20</span>日<span lang="EN-US"> 12:16<br>
<b>To: </b><a href="mailto:wu1587@purdue.edu">Wu, Yaoxing</a><br>
<b>Cc: </b><a href="mailto:flash-users@flash.rochester.edu">flash-users@flash.rochester.edu</a><br>
<b>Subject: </b>Re: [FLASH-USERS] Significant difference was found in 2d LaserSlab simulation between in cylindrical and cartesian coordiates</span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Microsoft YaHei",sans-serif">Dear Wu,<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Microsoft YaHei",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="text-indent:24.0pt"><span lang="EN-US" style="font-size:10.5pt;font-family:"Microsoft YaHei",sans-serif">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. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Microsoft YaHei",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Microsoft YaHei",sans-serif">Zhu <o:p></o:p></span></p>
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<p class="MsoNormal" style="word-break:break-all"><b><span lang="EN-US" style="color:#31353B">leizhuray</span></b><b><span lang="EN-US" style="font-size:12.0pt;color:#31353B"><o:p></o:p></span></b></p>
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<p class="MsoNormal" style="word-break:break-all"><span lang="EN-US" style="font-size:10.5pt;color:#9B9EA1">leizhuray@pku.edu.cn<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Microsoft YaHei",sans-serif;color:#78787A">---- Replied Message ----
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<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;color:#78787A">From
</span><span lang="EN-US" style="font-size:9.0pt;font-family:SimSun;color:#78787A"><o:p></o:p></span></p>
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<p class="MsoNormal" style="word-break:break-all"><span lang="EN-US" style="font-size:9.0pt;color:#232324"><a href="mailto:wu1587@purdue.edu"><span style="color:#3061F2;text-decoration:none">Wu, Yaoxing<wu1587@purdue.edu>
</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="word-break:break-all"><span lang="EN-US" style="font-size:9.0pt;color:#232324">10/20/2022 11:55
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:9.0pt;color:#78787A">To <o:p>
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<p class="MsoNormal" style="word-break:break-all"><span lang="EN-US" style="font-size:9.0pt;color:#232324"><a href="mailto:flash-users@flash.rochester.edu"><span style="color:#3061F2;text-decoration:none">flash-users@flash.rochester.edu<flash-users@flash.rochester.edu>
</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="word-break:break-all"><span lang="EN-US" style="font-size:9.0pt;color:#232324">[FLASH-USERS] Significant difference was found in 2d LaserSlab simulation between in cylindrical and cartesian coordiates
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Dear Flash users & developers,<o:p></o:p></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
</span>“<span lang="EN-US">example.par</span>”<span lang="EN-US"> simulation in LaserSlab is in cylindrical coordiates. I</span>’<span lang="EN-US">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?<o:p></o:p></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
</span>“<span lang="EN-US">gaussian1D</span>”<span lang="EN-US"> in cartesian. Then I think the laser power at a moment should be calculated by a single integral (shows below):<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><img border="0" width="302" height="84" style="width:3.15in;height:.875in" id="Picture_x0020_3" src="cid:image001.png@01D8E531.AA8E7290"></span><span lang="EN-US"><o:p></o:p></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
</span>“<span lang="EN-US">lasslab_LaserEnergyProfile.dat</span>”<span lang="EN-US"> 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.<o:p></o:p></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Yaoxing Wu<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:SimSun"> </span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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