|Title||Electron thermal transport barrier and magnetohydrodynamic activity observed in Tokamak plasmas with negative central shear|
|Publication Type||Journal Article|
|Year of Publication||1997|
|Authors||MR de Baar, G.MD Hogeweij, N.JL Cardozo, A.AM Oomens, F.C Schüller|
|Journal||Physical Review Letters|
|Date Published||Jun 16|
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.
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