Effect of Scrape-Off-Layer Current on Reconstructed Tokamak Equilibrium
| Autor: | Scott Kruger, J. R. Jepson, Richard J. Groebner, J.D. Hebert, Jacob King, Eric Held, James D. Hanson |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
Tokamak Computation Extrapolation Flux FOS: Physical sciences Edge (geometry) Condensed Matter Physics 01 natural sciences Physics - Plasma Physics 010305 fluids & plasmas law.invention Computational physics Plasma Physics (physics.plasm-ph) Nonlinear system law Physics::Plasma Physics 0103 physical sciences Current (fluid) 010306 general physics Pressure gradient |
| DOI: | 10.48550/arxiv.1702.00076 |
| Popis: | Methods are described that extend fields from reconstructed equilibria to include scrape-off-layer current through extrapolated parametrized and experimental fits. The extrapolation includes both the effects of the toroidal-field and pressure gradients which produce scrape-off-layer current after recomputation of the Grad-Shafranov solution. To quantify the degree that inclusion of scrape-off-layer current modifies the equilibrium, the $\chi$-squared goodness-of-fit parameter is calculated for cases with and without scrape-off-layer current. The change in $\chi$-squared is found to be minor when scrape-off-layer current is included however flux surfaces are shifted by up to 3 cm. The impact on edge modes of these scrape-off-layer modifications is also found to be small and the importance of these methods to nonlinear computation is discussed. Comment: 14 pages |
| Databáze: | OpenAIRE |
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