Details
The Dynamics of Electrons in Linear Plasma Devices and Its Impact on Plasma Surface Interaction
Springer Theses
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96,29 € |
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| Verlag: | Springer |
| Format: | |
| Veröffentl.: | 15.02.2019 |
| ISBN/EAN: | 9783030125363 |
| Sprache: | englisch |
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Beschreibungen
<div>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.</div><div><br></div><div>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.</div>
Introduction.- Plasma Wall Transition Dynamics.- Laser Light Scattering as Plasma Diagnostic.- Experimental Setup on PSI-2.- Thomson Scattering Setup.- Data Analysis and Calibration.- Steady State Plasma Results.- Plasma Turbulence Results.- Summary and Conclusion.
<div>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.</div><div><br></div><div>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. </div>
Nominated as an outstanding PhD thesis by the Research Center Jülich, Germany Versatile thomson scattering implementation with variable exposure time Extraction of arbitrary, not a priori known plasma oscillations or structures
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