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UID:submissions.pasc-conference.org_PASC24_sess161_msa242@linklings.com
SUMMARY:Particle-In-Cell (PIC) in Extreme Plasma Conditions: Strategies fo
 r HPC in QED-Dominated Interactions
DESCRIPTION:Minisymposium\n\nMarija Vranic (Instituto Superior Técnico)\n\
 nTo answer the needs of modelling strong field interaction, PIC codes requ
 ire tailored additional development. In particular, we have incorporated a
 dditional physics such that in-house developed OSIRIS framework could be u
 sed to simulate plasmas in extreme conditions, from the classical to the f
 ully QED-dominated interaction. OSIRIS-QED module has an embedded Monte Ca
 rlo algorithm to account for quantum processes, which has been thoroughly 
 benchmarked against known analytical results, codes used in the particle p
 hysics community (e.g. GUINEA-PIG). Besides physics developments, simulati
 ng the extreme regime has particular challenges on memory, load balance an
 d temporal discretization, which required particular code developments ori
 ented towards performance. We have developed Macro-particle merging algori
 thm and tailored load balance techniques to address the exponentially risi
 ng number of particles in QED cascades. This was followed by semi-analytic
 al particle pusher development for better accuracy and coupling the OSIRIS
  Quasi-3D geometry with OSIRIS-QED module. More recent developments of my 
 team include the Bethe-Heitler pair production and cross-section evaluatio
 n based on Machine Learning. All these developments are aimed to incorpora
 te new physics while minimizing impact on performance and scalability.\n\n
 Domain: Engineering, Physics, Computational Methods and Applied Mathematic
 s\n\nSession Chair: Andreas Adelmann (Paul Scherrer Institute, ETH Zurich)
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