Flow shear induced fluctuation suppression in finite aspect ratio shaped tokamak plasma
- Princeton University, Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)
- General Atomics, P.O. Box 85608, San Diego, California 92186-9784 (United States)
The suppression of turbulence by the {bold E}{times}{bold B} flow shear and parallel flow shear is studied in an arbitrary shape finite aspect ratio tokamak plasma using the two point nonlinear analysis previously utilized in a high aspect ratio tokamak plasma [Phys. Plasmas {bold 1}, 2940 (1994)]. The result shows that only the {bold E}{times}{bold B} flow shear is responsible for the suppression of flute-like fluctuations. This suppression occurs regardless of the plasma rotation direction and is, therefore, relevant for the very high (VH) mode plasma core as well as for the high (H) mode plasma edge. Experimentally observed in--out asymmetry of fluctuation reduction behavior can be addressed in the context of flux expansion and magnetic field pitch variation on a given flux surface. The adverse effect of neutral particles on confinement improvement is also discussed in the context of the charge exchange induced parallel momentum damping.
- Research Organization:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- DOE Contract Number:
- AC02-76CH03073; AC03-89ER51114
- OSTI ID:
- 46364
- Journal Information:
- Physics of Plasmas, Vol. 2, Issue 5; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
E{sub r} shear suppression of turbulence in enhanced reversed shear mode plasmas
Rotation shear induced fluctuation decorrelation in a toroidal plasma