TY - JOUR
T1 - Scrape-off layer width set by non-linear streamer flows in drift wave turbulence
AU - Kosuga, Y.
AU - Kin, F.
AU - Sasaki, M.
N1 - Funding Information:
We acknowledge useful discussion with P.H. Diamond, S. Inagaki, A. Fujisawa, Y. Nagashima, K. Itoh, and S.‐I. Itoh. This work was partly supported by the Grants‐in‐Aid for Scientific Research of JSPS of Japan (JP18K03578, JP15H02155, JP17H06089), the joint research project in RIAM.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/6/1
Y1 - 2020/6/1
N2 - In this work, we discuss the physics behind the excitation of non-linear streamer flows in drift wave turbulence and how to selectively excite these flows. Streamer flows are modelled as a non-linear, radially elongated convective cell in drift wave turbulence. It is shown that density modulation is key for exciting streamer flows. We show that streamer flows have a finite frequency, albeit smaller than that of drift waves. Streamers propagate in the ion direction. These theoretical predictions are compared against experimental data, which shows reasonable agreement. Finally, the scrape-off layer width set by streamer flows is calculated, and a scaling law against macroscopic plasma parameters is obtained.
AB - In this work, we discuss the physics behind the excitation of non-linear streamer flows in drift wave turbulence and how to selectively excite these flows. Streamer flows are modelled as a non-linear, radially elongated convective cell in drift wave turbulence. It is shown that density modulation is key for exciting streamer flows. We show that streamer flows have a finite frequency, albeit smaller than that of drift waves. Streamers propagate in the ion direction. These theoretical predictions are compared against experimental data, which shows reasonable agreement. Finally, the scrape-off layer width set by streamer flows is calculated, and a scaling law against macroscopic plasma parameters is obtained.
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U2 - 10.1002/ctpp.201900141
DO - 10.1002/ctpp.201900141
M3 - Article
AN - SCOPUS:85080983092
SN - 0863-1042
VL - 60
JO - Contributions to Plasma Physics
JF - Contributions to Plasma Physics
IS - 5-6
M1 - e201900141
ER -