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A broadband(BB) mode is observed by collective Thomson scattering diagnostics in repeatable shots of EAST and analyzed for the first time. This BB mode usually grows during L–H transitions,featuring a BB quasi-coherent mode with increasing frequency. During H-mode operations, it is characterized by steady-state BB in the high-frequency range( f ~ 200–2000 k Hz), at the electron scale(kθρs= 1–2), mainly driven by the density gradient, and is sensitive to the value of ηein th... 相似文献
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