Login

HEPP Seminar Summer 2026 #2: J. Ricken / A. Glock / A. Patel

→ Europe/Berlin
HGW-SR2 / GAR-D2

HGW-SR2 / GAR-D2
Gustavo Grenfell (Max Planck Institute for Plasma Physics - Garching), René Bussiahn (IPP Bereich Greifswald)
Description

https://eu02web.zoom-x.de/j/68203618730?pwd=0ftcdSo212mi4VamayjXSCmZX0tUZJ.1

Meeting-ID: 682 0361 8730
Kenncode: 267281

 
HEPP Seminar
Participants
  • Gustavo Grenfell
  • René Bussiahn
    • 16:00 → 16:15
      J. Ricken (I): Influence of the radial electric field and its shear on turbulence in Wendelstein 7-X 15m
      Speaker: Jan Ricken (ST)
      HEPP_Introductory_Talk_Ricken.pptx
    • 16:15 → 16:30
      A. Glock (I): Computational modeling of hot cathode ionization gauges 15m
      Speaker: Alexander Glock
      hepp-intro.pptx
    • 16:30 → 17:00
      A. Patel (P): Characterization of the assimilation of shattered pellets injected into a fusion plasma 30m

      Large tokamaks like ITER will require a disruption mitigation system (DMS) like the shattered pellet injection (SPI) to ensure machine protection during disruptions [1]. The SPI system injects cryogenic pellets that are shattered before entering the plasma. Experiments in present devices play a key role in understanding the plasma response to SPI. The SPI system in ASDEX Upgrade (AUG) [2] has been in operation since 2022 and has carried out many experiments with varying SPI and plasma parameters. In support of the experimental activities carried out at various tokamaks, additional modelling activities are also required for a physics-based extrapolation from the experimental results in present devices to ITER.

      This work focuses on two main aspects: 1) Analysis of the material penetration in AUG SPI experiments, 2) Characterizing the material assimilation using reducing modelling with the 1.5D code INDEX. Observations from the fast camera measurements during AUG SPI measurements show larger and faster fragments penetrating deeper in the plasma. When changing the neon concentration in the pellet, the penetration does not seem to increase for pellets with <1% neon but increases significantly for larger neon concentrations. The material assimilation in AUG for pure deuterium pellets and pellets with doped neon amounts varies between a few percent to 25% with the variation depending on pellet parameters. I will also briefly discuss current efforts in modelling pellet phenomena that significantly affect the material penetration and assimilation: the plasmoid drift and the rocket force.

      [1] M. Lehnen, et al. TECH/1–1, 2023 - IAEA (2023)
      [2] M. Dibon, et al. Rev. Sci. Instrum. 94, 043504 (2023)

      Speaker: Anshkumar Himanshu Patel (IPP-Garching)
      2026_HEPP_progress_v1.pptx