Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma
Abstract
Abstract Ion orbit loss has been used to model the formation of a strong negative radial electric field E r 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 E r 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 E r 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,more »
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC); SciDAC-4 Program
- OSTI Identifier:
- 1969798
- Alternate Identifier(s):
- OSTI ID: 1963754; OSTI ID: 1970760
- Grant/Contract Number:
- AC02-05CH11231; AC02-09CH11466
- Resource Type:
- Published Article
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Name: Nuclear Fusion Journal Volume: 63 Journal Issue: 6; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Publishing
- Country of Publication:
- IAEA
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
Zhu, Hongxuan, Stoltzfus-Dueck, T., Hager, R., Ku, S., and Chang, C. S. Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma. IAEA: N. p., 2023.
Web. doi:10.1088/1741-4326/acc815.
Zhu, Hongxuan, Stoltzfus-Dueck, T., Hager, R., Ku, S., & Chang, C. S. Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma. IAEA. https://doi.org/10.1088/1741-4326/acc815
Zhu, Hongxuan, Stoltzfus-Dueck, T., Hager, R., Ku, S., and Chang, C. S. Thu .
"Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma". IAEA. https://doi.org/10.1088/1741-4326/acc815.
@article{osti_1969798,
title = {Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma},
author = {Zhu, Hongxuan and Stoltzfus-Dueck, T. and Hager, R. and Ku, S. and Chang, C. S.},
abstractNote = {Abstract Ion orbit loss has been used to model the formation of a strong negative radial electric field E r 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 E r 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 E r 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.},
doi = {10.1088/1741-4326/acc815},
journal = {Nuclear Fusion},
number = 6,
volume = 63,
place = {IAEA},
year = {Thu Apr 13 00:00:00 EDT 2023},
month = {Thu Apr 13 00:00:00 EDT 2023}
}
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