Confinement Bifurcations in Magnetic Compression Experiments on TUMAN-3
Abstract
Under certain conditions^[1], an improvement in energy and particle confinement has been found to occur in minor radius compression experiments on TUMAN-3. The improvement occurred when the density n satisfied 6 × 10^19 m-3 < n < 1.5 × 10^19 m-3, and revealed itself as increases in T_e,Ti and n above adiabatic law predictions. At lower and higher densities outside the critical range, observed increases in T_e,Ti and n were below adiabatic law predictions. We suggest that a transition to H-mode is the explanation of super-adiabatic confinement improvements. Clear indications of an L arrow H transition were found in the two-fold minor radius compression experiment^[2]. Turbulence suppression by sheared E × B flow is thought to be the mechanism for confinement improvement. The mechanism of edge radial field generation during magnetic compression will be discussed. ^[1] V.E. Golant, et al., Proc 11th Eur Conf on Cont Fusion and Plas Phys, Aachen, pt I, 107, 1983. ^[2] Akatova, T.Yu., et al., Proc 13th Intl Conf on Plas Phys and Cont Nucl Fusion Res (Washington 1990), IAEA, vol I, 509, 1991.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- November 1999
- Bibcode:
- 1999APS..DPP.UP162G