Roles of Electric Field Shear and Shafranov Shift in Sustaining High Confinement in Enhanced Reversed Shear Plasmas on the TFTR Tokamak

Journal Article · Tue Apr 01 00:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.2972· OSTI ID:490212

Synakowski, E; Batha, S; Beer, M; Bell, M; Bell, R; Budny, R; Bush, C; Efthimion, P; Hammett, G; Hahm, T; LeBlanc, B; Levinton, F; Mazzucato, E; Park, H; Ramsey, A; Rewoldt, G; Scott, S; Schmidt, G; Tang, W; Taylor, G ; Zarnstorff, M ^[1]

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

The relaxation of core transport barriers in TFTR enhanced reversed shear plasmas has been studied by varying the radial electric field using different applied torques from neutral beam injection. Transport rates and fluctuations remain low over a wide range of radial electric field shear, but increase when the local {bold E}{times}{bold B} shearing rates are driven below a threshold comparable to the fastest linear growth rates of the dominant instabilities. Shafranov-shift-induced stabilization alone is not able to sustain enhanced confinement. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 490212
• Journal Information: Physical Review Letters, Vol. 78, Issue 15; Other Information: PBD: Apr 1997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
PLASMA CONFINEMENT
TFTR TOKAMAK
ELECTRIC FIELDS
SHEAR
GRAD-SHAFRANOV EQUATION
PLASMA BEAM INJECTION
INSTABILITY
STABILIZATION
FLUCTUATIONS
PRESSURE GRADIENTS
RELAXATION