Skip navigation
Please use this identifier to cite or link to this item:
Title: Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma
Contributors: Zhu, Hongxuan
Stoltzfus-Dueck, T
Hager, R
Ku, S
Chang, C. S.
U.S. Department of Energy, DE-AC02-09CH11466
U.S. Department of Energy, DE-AC02-05CH11231
U.S. Department of Energy, SciDAC-4
Princeton Research Computing
Keywords: ion orbit loss
radial electric field
tokamak edge plasmas
gyrokinetic simulations
Issue Date: 2023
Publisher: Princeton University
Citation: Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager, S. Ku, and C. S. Chang, 2023, "Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma," Princeton Plasma Physics Laboratory, Princeton University DataSpace.
Related Publication: Nuclear Fusion
Abstract: Ion orbit loss has been used to model the formation of a strong negative radial electric field Er in the tokamak edge, as well as edge momentum transport and toroidal rotation. To quantitatively measure ion orbit loss, an orbit-flux formulation has been developed and numerically applied to the gyrokinetic particle-in-cell code XGC. We study collisional ion orbit loss in an axisymmetric DIII-D L-mode plasma using gyrokinetic ions and drift-kinetic electrons. Numerical simulations, where the plasma density and temperature profiles are maintained through neutral ionization and heating, show the formation of a quasisteady negative Er in the edge. We have measured a radially outgoing ion gyrocenter flux due to collisional scattering of ions into the loss orbits, which is balanced by the radially incoming ion gyrocenter flux from confined orbits on the collisional time scale. This suggests that collisional ion orbit loss can shift Er in the negative direction compared to that in plasmas without orbit loss. It is also found that collisional ion orbit loss can contribute to a radially outgoing (counter-current) toroidal-angular-momentum flux, which is not balanced by the toroidal-angular-momentum flux carried by ions on the confined orbits. Therefore, the edge toroidal rotation shifts in the co-current direction on the collisional time scale.
Referenced By:
Appears in Collections:Theory and Computation

Files in This Item:
File Description SizeFormat 
README.txt359 BTextView/Download
ARK_DATA.zip16.38 MBUnknownView/Download

Items in Dataspace are protected by copyright, with all rights reserved, unless otherwise indicated.