Observation of radial propagation of electrostatic fluctuations in toroidal plasma

This is the authors' abstract. We don't add key points for this paper.

There has been a great deal of activity in the area of the detection of radial propagation of electrostatic fluctuations in toroidal magnetic fusion devices. The role of radial propagation is considered extremely important in the understanding of cross field anomalous transport. Radial propagation of low frequency electrostatic turbulence in a purely toroidal device, having no rotational transform, is reported in this paper. The propagation characteristics of the turbulence has been studied using Langmuir probes. It is found that the turbulence has a finite propagation in the radial direction and the radial speed is a sizeable fraction of the poloidal speed.