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Table of contents
1 Introduction
1.1 Fusion
1.2 The tokamak concept
1.3 H-mode
1.4 Thesis goals and outline
2 Basics of plasma physics
2.1 Charged particle dynamics in a tokamak
2.1.1 Drifts in a tokamak plasma
2.1.2 Collisional transport
2.2 Wave propagation in a magnetised plasma
2.2.1 Dielectric permittivity tensor
2.2.2 O- and X-mode polarisation
2.2.3 Radial resolution of reflectometry
3 Instabilities and turbulence in fusion plasmas
3.1 MHD instabilities and ELMs
3.2 Turbulence
3.2.1 Drift waves
3.2.2 Turbulent spectra
3.2.3 Turbulence suppression by shear flow
3.2.4 Limit-cycle oscillations
3.2.5 H-mode, turbulence and confinement
4 ASDEX Upgrade and diagnostics for temperature, density and electric field measurements
4.1 ASDEX Upgrade tokamak
4.2 Equilibrium reconstruction at ASDEX Upgrade
4.3 Laser interferometer
4.4 Electron cyclotron emission radiometer
4.5 Thomson scattering
4.6 Lithium beam emission spectroscopy
4.7 Charge exchange recombination spectroscopy
4.8 Magnetic pick-up coils
4.9 Profile reflectometers
4.10 Doppler reflectometer
5 Ultra-fast swept reflectometry
5.1 Ultra-fast swept reflectometer history and design
5.1.1 UFSR history
5.1.2 UFSR installation at ASDEX Upgrade
5.1.3 UFSR perfomance tests
5.2 Data analysis methodes
5.2.1 Density profile reconstruction
5.2.2 Step to the ASDEX database
5.2.3 Wavenumber power spectra and turbulence level
5.2.4 Frequency power spectra
5.2.5 Correlation length
6 Experimental results on the L-H transition
6.1 Dynamics and mechanisms of the L–H transition
6.2 Comparison of L- and H-mode turbulence characteristics
6.3 I-phase and limit-cycle oscillations
6.3.1 Radial electric field as main player during I-phase
6.3.2 Density and electric field dynamics during I-phase
6.3.3 Established I-phase as ELM-like phenomenon
6.3.4 Controversial early I-phase
6.4 Summary
7 Edge coherent modes
7.1 Observation of modes with the UFSR
7.2 Edge coherent modes in the ELM free phase of the H-mode
7.3 Edge coherent modes in between ELMs
7.4 Edge coherent modes during I-phase
7.5 Summary
8 Conclusions
Bibliography
