Electron thermal transport barrier and magnetohydrodynamic activity observed in Tokamak plasmas with negative central shear

TitleElectron thermal transport barrier and magnetohydrodynamic activity observed in Tokamak plasmas with negative central shear
Publication TypeJournal Article
Year of Publication1997
AuthorsMR de Baar, G.MD Hogeweij, N.JL Cardozo, A.AM Oomens, F.C Schüller
JournalPhysical Review Letters
Volume78
Number24
Pagination4573-4576
Date PublishedJun 16
ISBN Number0031-9007
Abstract

In the Rijnhuizen Tokamak Project, plasmas with steady-state negative central shear (NCS) are made with off-axis electron cyclotron heating. Shifting the power deposition by 2 mm results in a sharp transition of confinement. The good confinement branch features a transport barrier at the off-axis minimum of the safety factor (q), where q less than or equal to 3, and two magnetohydrodynamic (MHD) instabilities, where one is localized at the off-axis minimum of q and one covers the entire NCS region. The low confinement branch has q > 3 everywhere, no transport barrier, and no MHD activity.

DOI10.1103/PhysRevLett.78.4573
PID

b3ef479107a4fc7fff8484bfb8af4808

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