Observation of confined current ribbon in JET plasmas

Details Observation of confined current ribbon in JET plasmas Observation of confined current ribbon in JET plasmas

2009-10-30

arxiv.org/abs/0910.5873v1

Phys. Rev. Lett. 104, 185003 (2010)

Physics

Plasma Physics

10 pages, 6 figures

Scientific paper

10.1103/PhysRevLett.104.185003

we report the identification of a localised current structure inside the JET plasma. It is a field aligned closed helical ribbon, carrying current in the same direction as the background current profile (co-current), rotating toroidally with the ion velocity (co-rotating). It appears to be located at a flat spot in the plasma pressure profile, at the top of the pedestal. The structure appears spontaneously in low density, high rotation plasmas, and can last up to 1.4 s, a time comparable to a local resistive time. It considerably delays the appearance of the first ELM.

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