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SUMMARY:Spectral and spatial diagnostics on fluid moments in global partic
 le-in-cell simulations
DTSTART:20121115T140000
DTEND:20121115T150000
DTSTAMP:20260510T202459Z
UID:db8e8db699ea24d3b1bcb5b75134d4a5082a3e7894263545c3707223
CATEGORIES:Conferences - Seminars
DESCRIPTION:Christoph Wersal\nMax-Planck-Institute für Plasmaphysik\, Gar
 ching\, D\nThe theoretical understanding of mesoscale and microscale turbu
 lence is required for developing a predictive capability of heat\, particl
 e and momentum transport in tokamaks and stellarators. During the last yea
 rs\, the global particle-in-cell gyrokinetic code ORB5 has been upgraded w
 ith intra- and inter-species Landau collision operators for ions and elect
 rons and the ability to treat electromagnetic perturbations.\n\nMore recen
 tly\, the code has been extended to include new 3D diagnostics allowing fo
 r measurements of electromagnetic potentials and relevant fluid quantities
  (density\, temperature\, vorticity) as well as turbulence spectral analys
 is. In this talk the results of these diagnostics are presented\, focusing
  in particular on the convergence properties and the parametric dependenci
 es of the different fluid quantities in experimentally relevant conditions
 . In particular\, the number of markers resolution\, required to correctly
  describe the particle density evolution\, is found to be size-dependent: 
 larger systems (ITER like) require less numerical particles per mode than 
 smaller systems. In addition to this\, the new diagnostics also allows for
  a direct comparison between gyrokinetic and gyrofluid turbulence simulati
 ons.
LOCATION:PPB 019
STATUS:CONFIRMED
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