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<p class="MsoNormal"><span style="font-size:11.0pt">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">The Burn unit is written to model a chemical network of nuclear reactions for stellar interiors. You wouldn’t want to use it for ICF applications, unless you made some significant modifications.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">A simpler option would be to write your own code within a customized Simulation_adjustEvolution subroutine.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">--</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#181A1B">Eddie Hansen</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#181A1B">Applications Group Leader<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#181A1B">Flash Center for Computational Science</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">flash-users <flash-users-bounces@flash.rochester.edu> on behalf of Bowen Zhu (Student at CentraleSupelec) <bowen.zhu@student-cs.fr><br>
<b>Date: </b>Monday, October 7, 2024 at 8:06 AM<br>
<b>To: </b>flash-users@flash.rochester.edu <flash-users@flash.rochester.edu><br>
<b>Subject: </b>[FLASH-USERS] Assistance with Z-Pinch Simulation Including Nuclear Burn in FLASH<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">Dear FLASH Users,</span></b><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I am writing to seek guidance on performing a simulation of a Z-pinch that includes target physics. Specifically, I am interested in modeling the simplest case: a spherical cryogenic mixture of deuterium-tritium
(DT) with a coating. From previous posts, I understand that FLASH does not support neutron rate computation. However, I have learned that FLASH supports the Burn unit, which includes nuclear burn processes. Therefore, I wonder if FLASH can perform a semi-one-step
simulation, from the formation of a dynamic hohlraum to the ignition of the inertial confinement fusion (ICF) target.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">If possible, I would appreciate any information on how to integrate the Burn unit into the current Z-pinch simulation. I have already created two new species for the cryogenic deuterium-deuterium mixture (I have
not yet set up tritium) and the coating material. From the Cellular example, I understand that I need to set the mass fractions of isotopes, but I am unsure if this is compatible with the current Equation of State (EOS) I am using (considering the opacities
and the fraction of species).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Additionally, is it possible to apply the Burn unit only to the target material, or must it be set globally? I would greatly appreciate any guidance or examples, such as cases in laser ICF simulations using FLASH.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">I apologize if any of my questions are naive; I am earnestly trying to learn FLASH.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">Best regards,</span></b><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black">Bowen Zhu<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
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