量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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In this work, we discuss the physics behind the excitation of non-linear streamerflows in drift wave turbulence and how to selectively excite these flows. Streamerflows are modelled as a non-linear, radially elongated convective cell in driftwave turbulence. It is shown that density modulation is key for exciting streamerflows. We show that streamer flows have a finite frequency, albeit smaller thanthat of drift waves. Streamers propagate in the ion direction. These theoreticalpredictions are compared against experimental data, which shows reasonableagreement. Finally, the scrape-off layer width set by streamer flows is calculated,and a scaling law against macroscopic plasma parameters is obtained.
Scrape-off layer width set by non-linear streamer flows indrift wave turbulence
