The experiments to characterize the modification of edge fluctuations
using electrostatic probes have been performed on Keda Tokamak-5C (KT-
SC) [World Survey of Activities in Controlled Fusion Research, Nuclear
Fusion Special Supplement (International Atomic Energy Agency, Vienna
, 1991), p. 190]. The results show that the externally excited perturb
ation propagates in the direction of electron directional movement. Th
e observed phenomena are mainly related to the electrons, and can be w
ell explained by the proposed dynamic theory of the ballistic mode. Th
e experimental correlation coefficient and the longitudinal dispersion
relation are in good agreement with the proposed ballistic model. (C)
1997 American Institute of Physics.