Investigation of Turbulent Transport in Non-Stabilized Plasma at the Edge of the GOLEM Tokamak

TL;DR

This study investigates turbulent transport at the edge of the GOLEM tokamak, revealing non-Gaussian fluctuations and blob-like structures that influence plasma behavior without stabilization.

Contribution

It provides new insights into edge plasma turbulence, identifying the dominance of non-elongated blob-like structures in transport processes.

Findings

Non-Gaussian fluctuation behavior observed

Blob-like structures govern edge plasma transport

Radial and poloidal sizes of structures are comparable

Abstract

Plasma turbulent transport was investigated at the edge of the GOLEM tokamak. For this purpose, ion saturation current fluctuations were measured by means of Langmuir probes. Plasma stabilization was not activated during the discharges under study. Non-Gaussian behavior is observed, which indicates the presence of coherent structures. Study of the radial dependence of statistical and temporal characteristics of fluctuations allows to conclude that non-elongated blob-like structures with comparable radial and poloidal size should govern the plasma transport at the edge of the GOLEM tokamak.