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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260524T160952Z
UID:https://www.ipp.mpg.de/events/42250/5593462
DTSTART:20250625T110000Z
DTEND:20250625T120000Z
CLASS:PUBLIC
CREATED:20250618T151456Z
DESCRIPTION:Pedestal Relaxation Events (PREs) appear in I-mode discharges c
 lose to the I-H transition. Although they show certain similarities with E
 dge Localised Modes (ELMs)\, i.e. periodic energy ejections\, the underlyi
 ng mechanism seems to be very different from the mechanism responsible for
  ELMs. In this manuscript\, we present global trans-collisional fluid simu
 lations of an I-mode discharge in ASDEX Upgrade using GRILLIX. We observe 
 multiple PREs during the simulation\, which reproduce a range of experimen
 tally observed PRE characteristics. Furthermore\, analysis of various mode
  properties in our simulation allows us to pinpoint the underlying mechani
 sm responsible for triggering PREs to Micro-Tearing Modes (MTMs). The syst
 em is analysed dynamically by evaluating density and electron temperature 
 gradient lengths at the OMP position where the MTM grows over time. The pa
 th taken by the system in gradient length space is compared to a growth-ra
 te estimate calculated by linear theory in simplified slab geometry\, prov
 iding excellent agreement. Building on these insights\, we sketch a qualit
 ative picture of a PRE cycle.Finally\, we discuss the influence of the rec
 ently implemented Landau-fluid closure and the challenges of simulating lo
 w collisionality regimes with trans-collisional fluid models\, like the on
 e employed by GRILLIX.\nVortragende(r): Christoph Pitzal
LAST-MODIFIED:20250618T151500Z
LOCATION:IPP L5\, Raum: L5 Seminar room
SUMMARY:Paper Rehearsal: Global Trans-Collisional Fluid Simulations of Pede
 stal Relaxation Events in I-mode with GRILLIX
URL;VALUE=URI:https://www.ipp.mpg.de/events/42250/5593462
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