Density and Potential Fluctuation Measurements in the Tandem Mirror GAMMA 10 Plasma

We observed the suppressions of density fluctuations by the potential formation during electron cyclotron heating (ECH) in the GAMMA 10 tandem mirror plasma. In the radial positions where electric field gradient is lower region, the density fluctuation powers are larger than those in the other positions. Moreover, we observed the suppression of the potential fluctuation during the confining potential formation by ECH. The density and potential fluctuations are observed by using the multichannel interferometer and gold neutral beam probe system (GNBP), respectively. Then, we can study more detail about plasma confinement during the formation of confinement potential produced by ECH.