Development of steady/transient dual plasma irradiation device using a plasma gun

Abstract Synergistic effects of steady state plasma irradiation and transient heat/particle loads to plasma facing materials are an important plasma surface interaction issue in future fusion devices. To investigate the effects systematically, a new plasma gun device was developed and was combined to the linear plasma device NAGDIS-I. Fundamental characteristics of the plasma gun device are revealed in this paper. The amount of tungsten released from the electrode was measured with a material probe method. Also, the emissions from the impurities were investigated spectroscopically. To measure the plasma density, an interferometer measurement was developed; the ion temperature was measured spectroscopically. Moreover, a preliminary irradiation test of the plasma pulse to a tungsten sample was done, and the surface morphology change was shown with the analysis by a scanning electron microscope.