Publicaties
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Three-Dimensional MHD Wave Propagation and Conversion to Alfvén Waves near the Solar Surface. I. Direct Numerical Solution KU Leuven
The efficacy of fast - slow MHD mode conversion in the surface layers of sunspots has been demonstrated over recent years using a number of modelling techniques, including ray theory, perturbation theory, differential eigensystem analysis, and direct numerical simulation. These show that significant energy may be transferred between the fast and slow modes in the neighbourhood of the equipartition layer where the Alfvén and sound speeds ...
Study of SF6/N2O Microwave Plasma for Surface Texturing of Multicrystalline (< 150 mu m) Solar Substrates KU Leuven
Surface texturing is an imperative process to reduce the reflection of the incident light on solar cells, by enhancing sunlight diffusion into the silicon solar cells for photon generation. As a result, the current generation can be increased. In this study, the plasma texturing process with linear microwave plasma sources has been benchmarked with the industrial acidic iso-texturing process on 156 × 156mm 2 multicrystalline substrates. By ...
Large area microwave plasma CVD of diamond using composite right/left-handed materials Universiteit Hasselt
Diamond growth at low temperatures (<400 degrees C) and over large areas is attractive for materials, which are sensitive to high temperatures and require good electronic, chemical or surface tribological properties. Resonantcavity microwave plasma enhanced (MWPE) chemical vapor deposition (CVD) is a standard method for growing diamonds, however, with limited deposition area. An alternative method for CVD of diamond over large area and at low ...
Spectroscopic ellipsometry characterization of nano-crystalline diamond films prepared at various substrate temperatures and pulsed plasma frequencies using microwave plasma enhanced chemical vapor deposition apparatus with linear antenna delivery Universiteit Hasselt
A series of nanocrystalline diamond (NCD) films were deposited by a custom made microwave plasma enhanced chemical vapor deposition apparatus with linear antenna delivery at different substrate temperatures (520-600 degrees C) and pulsed plasma frequencies (2.7-14.3 kHz) in a hydrogen rich working gas mixture of H-2/CH4/CO2. Films were deposited onto naturally oxidized Si wafers pre-seeded with nanodiamond particles. Spectro-ellipsometry ...
Streamer propagation in a packed bed plasma reactor for plasma catalysis applications Universiteit Antwerpen
A packed bed dielectric barrier discharge (DBD) is widely used for plasma catalysis applications, but the exact plasma characteristics in between the packing beads are far from understood. Therefore, we study here these plasma characteristics by means of fluid modelling and experimental observations using ICCD imaging, for packing materials with different dielectric constants. Our study reveals that a packed bed DBD reactor in dry air at ...
Resonant Absorption of Surface Sausage and Surface Kink Modes under Photospheric Conditions KU Leuven
© 2017. The American Astronomical Society. All rights reserved.. We study the effect of resonant absorption of surface sausage and surface kink modes under photospheric conditions where the slow surface sausage modes undergo resonant damping in the slow continuum and the surface kink modes in the slow and Alfvén continua at the transitional layers. We use recently derived analytical formulas to obtain the damping rate (time). By considering ...
Characterization of an atmospheric pressure plasma jet and its application for treatment of non-woven textiles Universiteit Gent
Atmospheric pressure plasma jets are well-known in the plasma chemistry community because of their novelapplications. However, in spite of a large amount of publications, the physical chemistry of plasma jet/surface interactions is still unknown. In this work, an atmospheric pressure plasma jet (APPJ) in pure argon will be used to modify the surface of PET non-woven textiles. In a first part of the paper, the plasma jet will be characterized ...
Plasma treatment of fiber facets for increased (de)mating endurance in physical contact fiber connectors Vrije Universiteit Brussel
It is known that cleaving an optical fiber introduces a number of irregularities and defects to the fiber's end-face, such as hackles and shockwaves. These defects can act as failure initiators when stress is applied to the end-face. Given the fiber's small diameter of 125 pm, a large amount of mechanical stress can be expected to be applied on its end-face during the mating-demating cycle. In addition, a connector in a fiber-to-the-home (FTTH) ...