Plasmoid-mediated reconnection during nonlinear peeling–ballooning edge-localized modes
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 3-D current sheet instability is demonstrated through fully nonlinear resistive MHD simulations of P-B ELMs in DIIID discharges. Large-scale axisymmetric current sheets, as well as small-scale poloidally extended current sheets, are formed as the coherent P-B ELM laments 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.
- Research Organization:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES)
- Grant/Contract Number:
- SC0010565; AC02-09CH11466; SC0012467
- OSTI ID:
- 2203575
- Alternate ID(s):
- OSTI ID: 2007676; OSTI ID: 2217299
- Journal Information:
- Nuclear Fusion, Journal Name: Nuclear Fusion Vol. 63 Journal Issue: 12; ISSN 0029-5515
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- IAEA
- Language:
- English
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