CONVECTIVE CELL EXPERIMENTS
External excitation of convective cells is performed both in a fully ionized plasma (Q-device) and in a steady-state toroidal plasma. Field aligned absorption or injection of electrons by external pulses gives rise to the convective cells with positive or negative polarity. The space - time evolution of convective cells is investigated by two-dimensional potential mapping. A positive convective cell formed in a plasma flow is observed to drift, to elongate by the velocity shear, and to yield a new negative cell. Effects of ion viscosity on the damping and the size of convective cells are found in an endless "toroidal" convective cell. The other damping processes such as geometrical damping, turbulent damping, ion - neutral collisions, end effects are discussed. Cell - cell interactions are investigated by exciting two cells simultaneously. A possibility of coalescence of two cells with same polarity is demonstrated.
Bibliographic Reference: 1984 INTERNATIONAL CONFERENCE ON PLASMA PHYSICS, LAUSANNE (SWITZERLAND), JUNE 27-JULY 3, 1984 VOL. II, PP. 575-592 EUR 9708 EN (1985), FS, VOL. I AND VOL. II, 1155 P., BFR 3500 (BOTH VOLUMES), EUROFFICE, LUXEMBOURG, POB 1003
Record Number: 1989124056300 / Last updated on: 1987-01-01
Available languages: en