Reformation of the Electron Internal Transport Barrier with the Appearance of a Magnetic Island.

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 Rep

journal_title

Scientific reports

authors

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 K

doi

10.1038/s41598-019-56492-x

subject

Has Abstract

pub_date

2020-01-08 00:00:00

pages

5

issue

1

issn

2045-2322

pii

10.1038/s41598-019-56492-x

journal_volume

10

pub_type

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