Acceleration Mechanism of Vertical Displacement Event and its Amelioration in Tokamak Disruptions.
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- NAKAMURA Yukiharu
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- YOSHINO Ryuji
- Naka Fusion Research Establishment, Japan Atomic Energy Research Institute
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- POMPHREY Neil
- Princeton Plasma Physics Laboratory, Princeton University
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- C.JARDIN Stephen
- Princeton Plasma Physics Laboratory, Princeton University
Bibliographic Information
- Other Title
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- Acceleration Mechanism of Vertical Disp
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Abstract
Vertical displacement events (VDEs), which are frequently observed in disruptive discharges of elongated tokamaks, are investigated using the Tokamak Simulation Code. We show that disruption events such as a sudden plasma pressure drop (βp collapse) and the subsequent plasma current quench (Ip, quench) can accelerate VDEs due to the adverse destabilizing effect of the resistive shell, which has previously been thought to stabilize VDEs. In a tokamak with a surrounding shell which is asymmetric with respect to the geometric mid-plane, the Ip quench also causes an additional VDE acceleration due to the vertical imbalance of the attractive force. While the shell-geometry characterizes the VDE dynamics, the growth rate of VDEs depends strongly on the magnitude of the βp collapse, the speed of the Ip quench and the n-index of the plasma equilibrium just before the disruption. An amelioration of Ip quench-induced VDEs was experimentally established in the JT-60U tokamak by optimizing the vertical location of the plasma just prior to the disruption. The JT-60U vacuum vessel is shown to be suitable for preventing the βp collapse-induced VDE.
Journal
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- Journal of Nuclear Science and Technology
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Journal of Nuclear Science and Technology 33 (8), 609-619, 1996
Atomic Energy Society of Japan
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Details 詳細情報について
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- CRID
- 1390001204093733760
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- NII Article ID
- 10002075212
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- NII Book ID
- AA00703720
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- COI
- 1:CAS:528:DyaK28XmtVGmtL0%3D
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- ISSN
- 18811248
- 00223131
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- NDL BIB ID
- 4060414
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed