The microscopic structure of drift-wave turbulence perpendicular to the magnetic field is investigated in a toroidal plasma by means of multi-probe arrays. The dependence of structure sizes on the drift-scale ρ s is studied with the objective of classifying the range of perpendicular wavenumbers k ⊥ ρ s with respect to the analytical linear drift-wave dispersion relation. Wavenumbers in the range 0.2-1.5 are found according to a scaling aroundValues k ⊥ ρ s < 0.3, for which a dispersion-free dynamics is expected, are found in H and D. Biasing experiments on discharges in this range show that very strong E × B flow shear changes the characteristic mode structure in favour of coherent large-scale structures, which can be related to local turbulent inward transport as a result of modifications in the phase relation between density and potential fluctuations.
For the development of diffusion and insulation barriers for thin film solar cells on unpolished steel with a rough surface as substrate, investigations of the shape of deposited SiOx layers in dependence on an applied substrate biasing are carried out. Si‐wafers with a well‐defined surface structure in the range of micrometre are used as ‘model’ substrate. As a result, the deposition in the indentations of this surface is much higher in the case of a biased substrate. To determine the influence of the bias on the molecular structure, first investigations of the deposited layer without an applied bias are performed with in situ Fourier Transform InfraRed (FTIR) spectroscopy. Hence the molecular composition of the films is monitored during the deposition. In these spectra the Berreman effect occurs and is analysed.
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