Plasmoid-mediated reconnection during nonlinear peeling-ballooning edge-localized modes

Fatima Ebrahimi, Amitava Bhattacharjee

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Plasmoid-mediated reconnection is investigated for nonlinear peeling-ballooning edge-localized modes (P-B ELMs). The formation of current sheets and the transition to 3D current sheet instability is demonstrated through fully nonlinear resistive MHD simulations of P-B ELMs in DIII-D discharges. Large-scale axisymmetric current sheets, as well as small-scale poloidally extended current sheets, are formed as the coherent P-B ELM filaments nonlinearly evolve. It is observed that, at high Lundquist numbers, these current sheets break during a reconnection burst, i.e. a secondary exponential growth of intermediate modes followed by relaxation due to the suppression of P-B drive.

Original languageEnglish (US)
Article number126042
JournalNuclear Fusion
Volume63
Issue number12
DOIs
StatePublished - Dec 2023

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Keywords

  • ELM
  • MHD
  • edge instability
  • fusion
  • reconnection
  • tokamak

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