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          Institute: MPI für Plasmaphysik     Collection: Conference Papers     Display Documents

ID: 60435.0, MPI für Plasmaphysik / Conference Papers
Characterization of axisymmetric disruption dynamics
toward VDE avoidance in Tokamaks
Authors:Nakamura, Y.; Yoshino, R.; Granetz, R. S.; Pautasso, G.; Gruber, O.; Jardin, S. C.
Publisher:International Atomic Energy Agency
Place of Publication:Vienna
Date of Publication (YYYY-MM-DD):2003
Title of Proceedings:Fusion Energy 2002
Sequence Number:EX/P4-13
Physical Description:CD-ROM
Name of Conference/Meeting:19th Fusion Energy Conference
Place of Conference/Meeting:Lyon (FR)
(Start) Date of Conference/Meeting
End Date of Conference/Meeting 
Review Status:Internal review
Audience:Experts Only
Abstract / Description:Experiments and axisymmetric MHD simulations on tokamak disruptions have explicated the
underlying mechanisms of Vertical Displacement Events (VDEs) and a diversity of disruption dynamics. First,
the neutral point, which is known as an advantageous vertical plasma position to avoiding VDEs during the
plasma current quench, is shown to be fairly insensitive to plasma shape and current profile parameters.
Secondly, a rapid flattening of the plasma current profile frequently seen at thermal quench is newly clarified to
play a substantial role in dragging a single null-diverted plasma vertically towards the divertor. As a
consequence, the occurrence of downward-going VDEs predominates over the upward-going ones in bottom-diverted
discharges. This dragging effect is absent in up-down symmetric limiter discharges. These simulation
results are consistent with experiments. Together with the attractive force that arises from passive shell currents
and essentially vanishes at the neutral point, the dragging effect explains many details of the VDE dynamics over
the whole period of the disruptive termination.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Plasmaphysik/TOK
External Affiliations:Japan Atomic Energy Research Institute, Naka Fusion Research Establishment, Naka, Ibaraki, Japan ; Plasma Science and Fusion Center, MIT, Cambridge, Massachusetts, USA ; Princeton Plasma Physics Laboratory, Princeton University, New Jersey, USA
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