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DTSTAMP:20210916T132451Z
LOCATION:Lise Girardin
DTSTART;TZID=Europe/Stockholm:20210707T120000
DTEND;TZID=Europe/Stockholm:20210707T123000
UID:submissions.pasc-conference.org_PASC21_sess145_msa105@linklings.com
SUMMARY:Electromagnetic Gyrokinetic Simulations with Particle-in-Cell Code
 s
DESCRIPTION:Minisymposium\n\nElectromagnetic Gyrokinetic Simulations with 
 Particle-in-Cell Codes\n\nMishchenko, Koenies, Kleiber, Hatzky, Bottino...
 \n\nElectromagnetic gyrokinetic particle-in-cell simulations have been inh
 ibited for a long time by numerical problems. These problems are related t
 o a subtle numerical cancellation in the field equations which has to happ
 en in such simulations. This cancellation appears to be very difficult to 
 achieve in practice. In our presentation we will discuss the origin of the
  cancellation problem and give an overview of the mitigation techniques. T
 he key mitigation techniques, the "control-variate mitigation" and the "pu
 llback transformation scheme", will be described in detail. The mitigation
  schemes have been implemented in several global gyrokinetic PIC codes inc
 luding EUTERPE, ORB5, and XGC. These codes differ in discretisation scheme
 s and solution algorithms. Nevertheless, in all cases, a significant impro
 vement in the code efficiency has been observed when the pullback transfor
 mation scheme was used. Sometimes electromagnetic simulations were not pos
 sible unless the pullback mitigation was applied. In our presentation, we 
 will demonstrate the efficiency of the mitigation techniques using physica
 lly relevant examples of Alfvén eigenmodes and kinetic ballooning modes (K
 BM). Both, tokamak and stellarator geometries will be addressed.\n\nDomain
 : CS and Math, Physics
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