Off-Axis Sawteeth and Double-Tearing Reconnectionin Reversed Magnetic Shear Plasmas in TFTR

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.3553· OSTI ID:388415

Chang, Z; Park, W; Fredrickson, E D; Batha, S H; Bell, M G; Bell, R; Budny, R V; Bush, C E; Janos, A; Levinton, F M; McGuire, K M; Park, H; Sabbagh, S A; Schmidt, G L; Scott, S D; Synakowski, E J; Takahashi, H; Taylor, G; Zarnstorff, M C ^[1]

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1. Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)

Off-axis sawteeth are often observed in reversed magnetic shear plasmas when the minimum safety factor {ital q} is near or below 2. Fluctuations with {ital m}/{ital n}=2/1 ({ital m} and {ital n} are the poloidal and toroidal mode numbers) appear before and after the crashes. Detailed comparison has been made between the measured {ital T}{sub {ital e}} profile evaluation during the crash and a nonlinear numerical magnetohydrodynamics simulation. The good agreement between observation and simulation indicates that the off-axis sawteeth are due to a double-tearing magnetic reconnection process. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Princeton Plasma Physics Laboratory
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 388415
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON TEMPERATURE
FLUCTUATIONS
MAGNETOHYDRODYNAMICS
PLASMA
PLASMA SIMULATION
SAWTOOTH OSCILLATIONS
SHEAR
SHEAR PROPERTIES
TFTR TOKAMAK