Open AccessSpatiotemporal dynamics of cross-field ejection events in recombining detached plasma
Author(s) -
Hirohiko Tanaka,
Shin Kajita,
Hiroki Natsume,
I. Saeki,
Noriyasu Ohno
Publication year - 2020
Publication title -
plasma physics and controlled fusion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.328
H-Index - 111
eISSN - 1361-6587
pISSN - 0741-3335
DOI - 10.1088/1361-6587/ab8e19
Subject(s) - plasma , radius , atomic physics , physics , magnetic field , helium , nuclear physics , computer security , quantum mechanics , computer science
Three-dimensional spatiotemporal dynamics of detached helium plasma parameters along time, radius, and magnetic field were revealed in the linear device NAGDIS-II. To measure plasma parameters before and after the radial plasma ejection that was enhanced around the volume-recombining region, the conditional averaging technique was applied. The radial ejection was found to correlate with low-frequency changes of plasma-column parameters, which seemed to suppress the axial movement of the recombining region. Moreover, an azimuthal charge separation inside the ejected structure was observed, similar to the typical edge transport phenomenon: blobby plasma transport. The neutral flow effect was suggested as a candidate of the driving force.