The effect of the edge current density on confinement and kink mode stability in H-mode and VH-mode discharges

Technical Report · Fri Jul 01 00:00:00 EDT 1994

DOI:https://doi.org/10.2172/10169668· OSTI ID:10169668

Ferron, J R; Lao, L L; Osborne, T H; Strait, E J; Taylor, T S; Thompson, S J; Turnbull, A D ^[1]; Sauter, O ^[2]

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1. General Atomics, San Diego, CA (United States)
2. Ecole Polytechnique Federale de Lausanne (Switzerland)

The effect of the local current density in the outer portion of a tokamak discharge [J({rho} {approximately} a)] is discussed in three situations. In a H-mode discharge, a strong reduction of J({rho} {approximately} a) results in the loss of the H-mode pressure pedestal. A smaller reduction in J({rho} {approximately} a) can prevent the transition from H-mode to VH-mode. Finally, a sufficiently large value of J({rho} {approximately} a) accompanied by a sufficiently large value of the pressure gradient in the same region of the discharge, can destabilize low-n (e.g., n = 1 to 5) kink-type modes in a VH-mode discharge. Conference Information: European conference on controlled fusion and plasma physics, Montpellier (France), 26 Jun - 1 Jul 1994

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Swiss National Science Foundation, Bern (Switzerland)
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 10169668
• Report Number(s): GA-A-21737; CONF-940635-4; ON: DE94015719; TRN: 94:014743
• Resource Relation: Other Information: PBD: Jul 1994
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
TOKAMAK DEVICES
H-MODE PLASMA CONFINEMENT
KINK INSTABILITY
CURRENT DENSITY
EDGE LOCALIZED MODES
700310
700340
PLASMA CONFINEMENT
PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES