Conveners
4.7 Plasma Material Interactions
- Yao Kovach (University of Michigan)
A variety of self-organized structures have been observed in different plasma systems. Among these, radially symmetric patterns of rings and spots often emerge when an aqueous solution is used as an anode in an atmospheric DC discharge. These patterns are confined to the surface of the water, and their size and structure depend on the total plasma current and the salt concentration of the...
The concept on which the OLMAT project is basically the use of the Neutral Beams (NBI) used for the heating of the plasma in TJ-II for the irradiation of materials at relevant powers for the DEMO divertor, up to 20 MW /m2. At present, two NBI systems are available, capable of injecting up to 700KW into the plasma. The beam, generated by extraction of hydrogen ions from a plasma created for...
Abstract
Tungsten is the choice for first wall material for future nuclear fusion reactors owing to its properties like high melting point, good ablation resistance, good thermal conductivity, low deuterium/tritium retention etc. The thermal and radiation loads within experimental nuclear fusion reactors like ITER is expected extremely high in the diverter region where the transient and...
Vacuum Radio-Frequency (RF) devices can be subject to the multipactor effect, characterized by the very fast growth of the electron density in the vacuum. The created electrons have many undesirable effects, ranging from the perturbation of the RF signal to the initiation of a corona discharge that can lead to the complete destruction of the device. Hence, it is critical to be able to estimate...
The ability to create plasma sources similar in nature to astrophysical sources, but scaled to the laboratory, is extremely challenging. Specifically, photo-ionized plasmas that are common around black-hole accretion sources, nebulae and the cold interstellar medium, require powerful radiation sources that are not usually accessible in the laboratory. This leaves the photo-ionized plasma...
