期刊
NUCLEAR FUSION
卷 58, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aa9e9a
关键词
RF sheath boundary; radial electric field; convection cell
资金
- China Natural Science Foundation [11405215, 11505236, 11675217]
- program of Fusion Reactor Physics and Digital Tokamak
- CAS
- JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NSFC) [11261140328]
- JSPS-NRF-NSFC A3 Foresight Program in the field of Plasma Physics (NRF) [2012K2A2A6000443]
- US Department of Energy by the Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- USDOE [DE-FG02-97ER54392]
- US Department of Energy, Office of Science, Office of Fusion Energy Sciences [LLNL-JRNL-737154]
The equilibrium electric field that results from an imposed DC bias potential, such as that driven by a radio frequency (RF) sheath, is calculated using a new minimal two-field model in the BOUT++ framework. Biasing, using an RF-modified sheath boundary condition, is applied to an axisymmetric limiter, and a thermal sheath boundary is applied to the divertor plates. The penetration of the bias potential into the plasma is studied with a minimal self-consistent model that includes the physics of vorticity (charge balance), ion polarization currents, force balance with E x B, ion diamagnetic flow (ion pressure gradient) and parallel electron charge loss to the thermal and biased sheaths. It is found that a positive radial electric field forms in the scrape-off layer and it smoothly connects across the separatrix to the force-balanced radial electric field in the closed flux surface region. The results are in qualitative agreement with the experiments. Plasma convection related to the E x B net flow in front of the limiter is also obtained from the calculation.
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