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- W2038000272 abstract "The turbulence in the scrape-off layer (SOL) plasma of FTU is characterized in order to assess its effect on the current drive efficiency of the lower hybrid (LH) waves. Amplitude, frequency and perpendicular wave vector of the fluctuations are measured for a variety of the main plasma conditions in front of the LH antenna together with the temperature and density in the SOL and used as inputs for the linear scattering theory of the LH waves developed many years ago. This theoretical model can account for both the frequency spectral broadening of the LH pump and the variations of the driven current, inferred by the perpendicular fast electron bremsstrahlung signals. The fraction of the LH power that is then deduced to be effective for current drive appears to be well related to the calculated optical thickness τ of the SOL. It drops as low as 40% as τ increases, consistent with the model prediction. Possible ways to control the SOL optical depth are investigated and a clear relation of the fluctuation level with the collisionality is found." @default.
- W2038000272 created "2016-06-24" @default.
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- W2038000272 date "2011-11-01" @default.
- W2038000272 modified "2023-10-13" @default.
- W2038000272 title "Lower hybrid current drive efficiency in tokamaks and wave scattering by density fluctuations at the plasma edge" @default.
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- W2038000272 doi "https://doi.org/10.1088/0029-5515/51/11/113023" @default.
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