Resistive Interchange Modes in Negative Central Shear Tokamaks with Peaked Pressure Profiles

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.2710· OSTI ID:390392

Chu, M S; Greene, J M; Lao, L L; Miller, R L; Bondeson, A; Sauter, O; Rice, B W; Strait, E J; Taylor, T S; Turnbull, A D ^[1]

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1. General Atomics, San Diego, California 92186-9784 (United States)

Resistive interchange modes can be driven unstable by large pressure gradients in the negative central magnetic shear (NCS) region of advanced tokamaks. Localized stability analysis reveals that the resistive interchange stability criterion ({ital D}{sub {ital R}}{le}0) is violated in this region, and unstable {ital n}=1 localized resistive magnetohydrodynamic (MHD) modes are computed using the resistive MHD code {lt}emph type={double_prime}6{double_prime}{gt}mars. In DIII-D NCS plasmas, these instabilities appear as bursting MHD activities, constituting the first identification of resistive interchange in a high temperature tokamak experiment. These bursts also appear to play a role in triggering disruptions. {copyright} {ital 1996 The American Physical Society.}

• DOE Contract Number: FG03-95ER54309; W-7405-ENG-48
• OSTI ID: 390392
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPUTER CODES
INTERCHANGEABILITY
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MHD EQUILIBRIUM
PLASMA INSTABILITY
PRESSURE GRADIENTS
SHEAR
TOKAMAK DEVICES