<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi David,<br>
<br>
It will be the same pseudovacuum (i.e. low density Helium) if you
define it as chamber material. And you should, the LaserSlab is
not made for pure vacuum as it is not handled by the EOS of your
case.<br>
<br>
Best,<br>
Arthur<br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Arthur Hirsch-Passicos
Post-doctoral Researcher
Laser Particle Acceleration Division
Institute of Radiation Physics
Helmholtz-Zentrum Dresden-Rossendorf e.V.</pre>
<div class="moz-cite-prefix">On 18/06/2025 00:03, David Montgomery
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:99302950-6C28-4EBC-907C-851C03A5961B@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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="lineBreakAtBeginningOfSignature">
<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 class="moz-txt-link-rfc2396E" href="mailto:xu.zhao@york.ac.uk"><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 gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Tue, 17 Jun 2025 at
22:17, David Montgomery <<a
href="mailto:dsmont80@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">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>
_______________________________________________<br>
flash-users mailing list<br>
<a href="mailto:flash-users@flash.rochester.edu"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">flash-users@flash.rochester.edu</a><br>
<br>
For list info, including unsubscribe:<br>
<a
href="https://flash.rochester.edu/mailman/listinfo/flash-users"
rel="noreferrer" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">https://flash.rochester.edu/mailman/listinfo/flash-users</a><br>
</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>
<div><a class="moz-txt-link-rfc2396E" href="mailto:WX20250617-224328@2x.png"><WX20250617-224328@2x.png></a></div>
</div>
</blockquote>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre wrap="" class="moz-quote-pre">_______________________________________________
flash-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:flash-users@flash.rochester.edu">flash-users@flash.rochester.edu</a>
For list info, including unsubscribe:
<a class="moz-txt-link-freetext" href="https://flash.rochester.edu/mailman/listinfo/flash-users">https://flash.rochester.edu/mailman/listinfo/flash-users</a>
</pre>
</blockquote>
</body>
</html>