Electron temperature measurement in JIPP-Ib stellarator by the method of time history

The time variation of the line emission of the impurities in the vacuum-ultraviolet spectral range is measured. With the use of experimental data, the electron temperature of the low β plasma confined in JIPP-Ib stellarator has been determined by the method of time history. The helium plasma produced by the ohmically heating current is used. The determined electron temperature is around 120 eV at 0.8 ms after the start of discharge. The results of the simulation based on the model introducing the effect of inhomogeneity show that the electron temperature determined by this method corresponds to the temperature at the plasma center. (auth.)