Core and edge turbulences were measured by Langmuir probe arrays in the KT-5C tokamak plasma.The radial wavenumber spectra show a quasimode like structure which results in a net radial outward propagation of the turbu...Core and edge turbulences were measured by Langmuir probe arrays in the KT-5C tokamak plasma.The radial wavenumber spectra show a quasimode like structure which results in a net radial outward propagation of the turbulent fluctuations.The measured fluctuation levels and wave action fluxes are in good agreement with model predictions by Mattor et al.,suggesting that drift wave propagation could be a source of edge turbulence.展开更多
Time and space resolved measurements of the radial electric field(Er)have been conducted during the electrode biasing experiments on the KT-5C tokamak.The suppression of the turbulent transport with the change of Er i...Time and space resolved measurements of the radial electric field(Er)have been conducted during the electrode biasing experiments on the KT-5C tokamak.The suppression of the turbulent transport with the change of Er induced by the biased electrode is observed.It is found that the poloidal flow contributes to the main part of the Er,and the change of the poloidal flow has a lead of about 20μs to the formation of Er.These observations suggest that a radial current,responding to an induced voltage on the electrode,drives a poloidal flow which in turn drives the radial electric field.展开更多
Features of a low frequency ion mode were observed together with the electron drift wave type fluctuations by a Langmuir probe array in the bulk plasma inside the velocity shear layer in the KT-5C tokamak.The measured...Features of a low frequency ion mode were observed together with the electron drift wave type fluctuations by a Langmuir probe array in the bulk plasma inside the velocity shear layer in the KT-5C tokamak.The measured ion mode wavenumber,scaling of the ion mode with chord-averaged density,and the estimatedηi value suggest that the observed ion mode may be the theoretically predictedηi mode driven by ion temperature gradient.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.19675036,19635020the Doctoral Training Foundation of National Education Commission of China and Chinese Academy of Sciences.
文摘Core and edge turbulences were measured by Langmuir probe arrays in the KT-5C tokamak plasma.The radial wavenumber spectra show a quasimode like structure which results in a net radial outward propagation of the turbulent fluctuations.The measured fluctuation levels and wave action fluxes are in good agreement with model predictions by Mattor et al.,suggesting that drift wave propagation could be a source of edge turbulence.
基金Supported by the National Natural Science Foundation of China under Grant Nos.19635020,19675036,19775046the Chinese Academy of Sciences,and the National Doctoral Training Foundation under Grant Nos.9535806,9803810.
文摘Time and space resolved measurements of the radial electric field(Er)have been conducted during the electrode biasing experiments on the KT-5C tokamak.The suppression of the turbulent transport with the change of Er induced by the biased electrode is observed.It is found that the poloidal flow contributes to the main part of the Er,and the change of the poloidal flow has a lead of about 20μs to the formation of Er.These observations suggest that a radial current,responding to an induced voltage on the electrode,drives a poloidal flow which in turn drives the radial electric field.
基金Supported by the National Natural Science Foundation of China under Grant No.19275041the Doctoral Training Foundation of National Education Commission of China,and the Chinese Academy of Sciences.
文摘Features of a low frequency ion mode were observed together with the electron drift wave type fluctuations by a Langmuir probe array in the bulk plasma inside the velocity shear layer in the KT-5C tokamak.The measured ion mode wavenumber,scaling of the ion mode with chord-averaged density,and the estimatedηi value suggest that the observed ion mode may be the theoretically predictedηi mode driven by ion temperature gradient.
