The Dynamics of Electrons in Linear Plasma Devices and Its Impact on Plasma Surface Interaction

Description

Turbulence in plasma surface interaction holds crucial uncertainties for its impact on material erosion in the operation of fusion reactors. In this thesis, the design, development and operation of a Thomson scattering diagnostic and its novel implementation with fast visual imaging created a versatile tool to investigate intermittently occuring plasma oscillations. Specifically, ballistic transport events in the plasma edge, constituting turbulent transport, have been targeted in this thesis. With the help of a custom photon counting algorithm, the conditional averaging technique was applied on Thomson scattering for the first time to allow spatial and pseudo-time-resolved measurements. Since plasma turbulence and the emerging transport phenomena are comparable in most magnetized devices, the diagnostic development and the results from the linear plasma device PSI-2 are useful for an implementation of similar techniques in larger fusion experiments. Furthermore, the obtained results indicate a strong enhancement of erosion with turbulent transport and thus underline the importance of dedicated experiments investigating plasma turbulence in the framework of erosion in future fusion reactors. Front Matter ....Pages i-xiv Introduction (Michael Hubeny)....Pages 1-8 Plasma Wall Transition Dynamics (Michael Hubeny)....Pages 9-21 Laser Light Scattering as Plasma Diagnostic (Michael Hubeny)....Pages 23-32 Experimental Setup on PSI-2 (Michael Hubeny)....Pages 33-40 Thomson Scattering Setup (Michael Hubeny)....Pages 41-52 Data Analysis and Calibration (Michael Hubeny)....Pages 53-70 Steady State Plasma Results (Michael Hubeny)....Pages 71-84 Plasma Turbulence Results (Michael Hubeny)....Pages 85-117 Summary and Conclusion (Michael Hubeny)....Pages 119-123 Back Matter ....Pages 125-126