Fluctuation Suppression during the ECH induced Potential Formation in the Tandem Mirror GAMMA 10

Full text: The particle flux evaluated from the phase difference between the potential and density fluctuations measured by a gold neutral beam probe (GNBP) showed the radial outward flux and its correlation with the decrease in the stored energy. The suppression of the potential fluctuation was clearly observed during the radial potential profile change and positive electric fields driven by electron cyclotron heating (ECH). When flux is suppressed by the potential formation, the quick plasma stored energy increase is observed. These indicate that the observed fluctuations are the one of the source of the anomalous radial transport and the radial profile of the potential is one of the keys to control plasma transport. (author)