Density protuberances created by moderately high power microwave pulses propagating in corrugated plasma waveguides

Summary form only given. Protuberances (local maxima) in plasma density in the axial direction created by microwave pulses externally injected into a plasma-filled corrugated wall waveguide (slow wave structure, SWS) are observed experimentally. This is observed for moderately high microwave powers above a threshold value repeatedly under various conditions.