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- W2092232264 abstract "Measurements show that the vicinity of powered Ion Cyclotron Range of Frequency (ICRF) antennae is biased positively with respect to its environment [1] [2]. This is attributed to RF‐sheaths. The radial penetration of DC potentials into Tokamak SOL determines the power deposition on the walls and especially on the antenna structure, which is a key point for long time clean discharges. Within independent flux tube models of RF‐sheath rectification the radial penetration of DC potentials is determined by the skin depth x0 = c/ωpe for the slow wave. When self‐consistent exchanges of transverse RF currents are allowed between neighboring flux tubes, such a structure can be broadened radially up to a characteristic transverse length L. Broadening arises as soon as L>r0. A linear modeling gives a first evaluation of the theoretical length L≈(L‖ρci/)1/2. Within the ‘flute assumption’ it scales with the length L‖ of open flux tubes and the ion Larmor radius ρci. This has been confirmed by the SEM code [1] which takes into account non‐linear rectifications. Applying our model to several potential maps generated by an ITER antenna, it comes out that L ranges between 1 and 10 cm depending on local L‖ and on typical ITER plasma parameters. Langmuir probe measurements on Tore Supra [2] suggest that the broadening is lower than predicted by the code, which supposes that currents do not occur all over the parallel magnetic lines but on a fraction of it." @default.
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- W2092232264 date "2009-01-01" @default.
- W2092232264 modified "2023-09-26" @default.
- W2092232264 title "Radial Broadening of DC potential structures in front of ICRF antennas by transverse exchange of RF currents" @default.
- W2092232264 doi "https://doi.org/10.1063/1.3273718" @default.
- W2092232264 hasPublicationYear "2009" @default.
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