Abstract:
:When realising future fusion reactors, their stationary burning must be maintained and the heat flux to the divertor must be reduced. This essentially requires a stationary internal transport barrier (ITB) plasma with a fast control system. However, the time scale for determining the position of the foot point of an ITB is not clearly understood even though its understanding is indispensable for fast profile control. In this study, the foot point of the electron ITB (eITB) was observed to be reformed at the vicinity of a magnetic island when the island started to form. In addition, the enhanced confinement region was observed to expand during the eITB formation according to the radial movement of the magnetic island toward the outer region. Compared to the time scales of the local heat transport, the faster time scales of the movement of the eITB foot point immediately after island formation (~0.5 ms) suggest the importance of the magnetic island for plasma profile control to maintain stationary burning.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kenmochi N,Minami T,Mizuuchi T,Takahashi C,Weir GM,Nishioka K,Kobayashi S,Nakamura Y,Okada H,Kado S,Yamamoto S,Ohshima S,Konoshima S,Ohtani Y,Nagasaki Kdoi
10.1038/s41598-019-56492-xsubject
Has Abstractpub_date
2020-01-08 00:00:00pages
5issue
1issn
2045-2322pii
10.1038/s41598-019-56492-xjournal_volume
10pub_type
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