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dc.contributor.authorZhu, Hongxuan-
dc.contributor.authorStoltzfus-Dueck, T-
dc.contributor.authorHager, R-
dc.contributor.authorKu, S-
dc.contributor.authorChang, C. S.-
dc.identifier.citationHongxuan Zhu, T. Stoltzfus-Dueck, R. Hager, S. Ku, and C. S. Chang, 2022, "Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields," Princeton Plasma Physics Laboratory, Princeton University DataSpace.en_US
dc.description.abstractIon orbit loss is considered important for generating the radially inward electric field Er in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokamaks with a magnetic X point. In neoclassical equilibria, Coulomb collisions can scatter ions onto loss orbits and generate a radially outward current, which in steady state is balanced by the radially inward current from viscosity. To quantitatively measure this loss-orbit current in an edge pedestal, an ion-orbit-flux diagnostic has been implemented in the axisymmetric version of the gyrokinetic particle-in-cell code XGC. As the first application of this diagnostic, a neoclassical DIII-D H-mode plasma is studied using gyrokinetic ions and adiabatic electrons. The validity of the diagnostic is demonstrated by studying the collisional relaxation of Er in the core. After this demonstration, the loss-orbit current is numerically measured in the edge pedestal in quasisteady state. In this plasma, it is found that the radial electric force on ions from Er approximately balances the ion radial pressure gradient in the edge pedestal, with the radial force from the plasma flow term being a minor component. The effect of orbit loss on Er is found to be only mild.en_US
dc.description.tableofcontentsSee README.txt.en_US
dc.publisherPrinceton Universityen_US
dc.relationNuclear Fusionen_US
dc.subjection orbit lossen_US
dc.subjectradial electric fielden_US
dc.subjecttokamak edge plasmasen_US
dc.subjectgyrokinetic simulationsen_US
dc.titleEffects of collisional ion orbit loss on neoclassical tokamak radial electric fieldsen_US
pu.depositorZhu, Hongxuan-
dc.contributor.funderU.S. Department of Energy, DE-AC02–09CH11466en_US
dc.contributor.funderU.S. Department of Energy, DE-AC02- 05CH11231en_US
dc.contributor.funderU.S. Department of Energy, SciDAC-4en_US
dc.contributor.funderPrinceton Research Computingen_US
Appears in Collections:Theory and Computation

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