Measurements of 2-Dimensional Plasma Density Distributions by the Phase-Imaging Method in GAMMA 10

Plasma density measurements are one of the important studies for achievement of nuclear fusion reaction. We have studied plasma electron density distributions and plasma frequency fluctuation by using microwave interferometers etc. in GAMMA 10. We show the first results of 2-dimensional plasma density distributions measurement under some conditions of the electron cyclotron resonance heating microwave power in GAMMA 10.