Nonaxisymmetric energy deposition pattern on ASDEX upgrade divertor target plates during type-I edge-localized modes.
作者： T. Eich , A. Herrmann , J. Neuhauser
DOI: 10.1103/PHYSREVLETT.91.195003
关键词: Energy (signal processing) 、 Tokamak 、 Field (physics) 、 Physics 、 Line (formation) 、 Atomic physics 、 Divertor 、 Toroid 、 ASDEX Upgrade 、 Type (model theory) 、 Nuclear magnetic resonance
摘要: In the ASDEX Upgrade tokamak, complex power deposition structures on divertor target plates during type-I edge-localized modes (ELMs) have been discovered by fast (few microseconds), two-dimensional ($40\ifmmode\times\else\texttimes\fi{}40\text{ }{\mathrm{c}\mathrm{m}}^{2}$) infrared thermography. addition to usual axisymmetric line near separatrix, there appear, statistically distributed, several laterally displaced and inclined stripes, mostly well separated from each other main strike zone. These are interpreted as footprints of approximately field aligned, helical perturbations at low side plasma edge related nonlinear ELM evolution. Based this picture, mode structure can be derived load pattern, yielding average toroidal numbers in a range 8\char21{}24.
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