Observation of Mechanical Oscillation induced by Pulsed Plasma-Momentum Injection to Tungsten Foil in AIT-PID for Fusion Studies

Abstract

Mechanical oscillation of tungsten (W) foil induced by pulsed plasma-momentum injection was observed in addition to its deflection in linear plasma generation device AIT-PID for fusion studies. It is motivated by a worry about an enormous heat flow into divertors: Edge Localized Mode (ELM) in magnetically confined fusion devices. The importance of plasma-momentum must be noted here in addition to a large amount of heat flux, especially on liquid metal divertor and melted layer of W wall surface. Visualization of momentum injection was obtained by the observation of mechanical oscillation of W foil which was modeled numerically as a cantilever configuration. The comparison of oscillation frequencies between the observation and cantilever model was made in addition to the oscillation amplitude.