<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Leonard,<div><br></div><div>There isn’t a capability existing in FLASH to do what you describe, but it shouldn’t be too difficult to implement. You could implement a modification of the inverse Bremsstrahlung rate that should accomplish what you want (if I’ve understood you correctly). You can copy "source/physics/sourceTerms/EnergyDeposition/EnergyDepositionMain/Laser/LaserUtilities/ed_inverseBremsstrahlungRate.F90” into your simulation directory and customize it to your heart’s desire.</div><div><br></div><div>I would be interested to know if you’re able to find success with something like this!</div><div><br id="lineBreakAtBeginningOfMessage"><div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">*********************************************<br>Adam Reyes</div><br class="Apple-interchange-newline"><span><img alt="FLASH.jpg" src="cid:EA5A7E59-94B9-4162-879C-B52E774AEA24"></span><meta charset="UTF-8"><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); 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<div><br><blockquote type="cite"><div>On Apr 29, 2024, at 11:59 AM, Wegert, Leonard <L.Wegert@gsi.de> wrote:</div><br class="Apple-interchange-newline"><div><div>Hi FLASH users!<br><br>I'm trying to model the interaction of a very short laser pulse (100 fs, 1e16 W/cm^2) with a solid Titanium target. As expected, the target's sharp edge reflects nearly all of the laser's energy and nothing happens. <br>Does anyone have experiences on how to model the interaction of short laser pulses with solid targets in FLASH? (Properly model the laser prepulse, introduce a thin area of lower density, play around with the minimum ionization level?)<br>Codes like MULTI-fs try to implement resonant absorption by introducing a parameter, that specifies the fraction of energy that is absorbed at the critical density (instead of reflecting everything). Are there ambitions to introduce a similar parameter for FLASH (Or is there already one and I just didn't find it?)?<br><br>I'm looking forward to hear from your experiences.<br><br>Cheers,<br><br>Leonard Wegert<br>GSI Helmholtzzentrum für Schwerionenforschung GmbH<br>Plasma Physics Department<br>l.wegert@gsi.de<br><br><br><br><br><br><br><br><br>_______________________________________________<br>flash-users mailing list<br>flash-users@flash.rochester.edu<br><br>For list info, including unsubscribe:<br>https://flash.rochester.edu/mailman/listinfo/flash-users<br></div></div></blockquote></div><br></div></body></html>