26 november 2008
Friday, November 28, colloquium: The Surface Science of ITER, by Aart Kleyn (FOM-Rijnhuizen/ Leiden University. Nikhef, room H331, 15:15 hours.
In this talk an brief introduction to surface science will be followed by two examples from the authors lab on surface science investigations: - the interaction between H2-molecules and metal surfaces. This example will demonstrate the state of the art in the field as far as understanding of such interactions at the quantum mechanical level is concerned. - the study of a surface proces by femtosecond time resolved infrared pectroscopy. This example shows the development of a novel technique, sum frequency generation, that allow surface specific investigations under a variety of conditions, including plasma processing. The connection to ITER-related studies will be pointed out. Experiments with the atomistic rigour of traditional surface science cannot be carried out on ITER. Nevertheless, detailed studies on the interaction at for instance divertor surfaces during operation are highly desirable. To mimick ITER-like conditions and be able to study the surface interactions in some detail a new linear plasma device Pilot-PSI has been construction. Characteristics of the device and first results on graphite targets will be presented. In addition, the design for a much larger and better diagnosed device to study Plasma-Surface Interaction, Magnum-PSI will be shown.