<div dir="ltr">Hi David,<div><br></div><div>It will be the same as the low density Helium “chamber” species.</div><div>As in the simulation box there are two only species, "Targ" and “chamber” , defined by the <u>Simulation_initBlock.F90</u> .</div><div><br></div><div>Actually, there is no truly vacuum in the usual simulations... The vacuum is alaway replaced by low-density materials, "chamber" in LaserSlab case.</div><div>It works for most cases but sometimes may potentially cause some nonphysical phenomena.</div><div><br></div><div> </div><div><br></div><div>Best,</div><div>Xu</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, 17 Jun 2025 at 23:04, David Montgomery <<a href="mailto:dsmont80@gmail.com">dsmont80@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">Hi Xu,<div><br></div><div>Thank you for the quick response. </div><div><br></div><div>Will that extra space be truly vacuum, or will it be the same as the low density Helium “chamber” species?</div><div><br></div><div>David <br id="m_2117128372496667963lineBreakAtBeginningOfSignature"><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Jun 17, 2025, at 3:57 PM, Xu Zhao <<a href="mailto:xu.zhao@york.ac.uk" target="_blank">xu.zhao@york.ac.uk</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div dir="ltr">Hi David,<div><br></div><div>If you want to add some space behind the target (see attached) compared to the Laserslab default,</div><div><br></div><div>I think just increasing ymax (the box length if you run in 2d) in the .par will work.</div><div><br></div><div><div>Usually the <u>Simulation_initBlock.F90</u> defines the "blocks (cells)" in the simulations.</div><div><br></div><div>For example line 100 - line 129 in the <u>Simulation_initBlock.F90 </u>define which part is the "<font face="monospace">target</font>" species and the other is "<font face="monospace">Cham</font>".</div></div><div><br></div><div>You do not need to modify other files as they define the variables (like "<font face="monospace">sim_targetHeight</font>") and material files ("like eos file").</div><div><br></div><div>Hope this helps,</div><div>Xu</div><div><div><br></div></div><div><br></div></div><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 17 Jun 2025 at 22:17, David Montgomery <<a href="mailto:dsmont80@gmail.com" target="_blank">dsmont80@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi All,<br>
<br>
Another FLASH-newbie question. I’ve successfully run the LaserSlab example, and made some small modifications in my own *.par file.<br>
<br>
If I want to add a “chamber gas” region (low density Helium) to the rear side of the target (surface NOT irradiated by the laser), in addition to the front side of the target, which files do I need to modify besides just the *.par file?<br>
<br>
Do I have to modify one or more of the local *.F90 files?<br>
<br>
Or can I use the same “species” (Cham) on both the rear and front side of the “target” species?<br>
<br>
Any advice would be very helpful.<br>
<br>
Thanks,<br>
David Montgomery <br>
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</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><span style="color:rgb(136,136,136)">Xu Zhao</span></div><div><span style="color:rgb(136,136,136)">PDRA</span></div><span style="color:rgb(136,136,136)">York Plasma Institute</span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">School of Physics, Engineering and Technology</span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">University of York</span><br style="color:rgb(136,136,136)"><span style="color:rgb(136,136,136)">York YO10 5DQ, UK</span><br></div></div></div>
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