https://pure.mpg.de/pubman/item/item_2141173_1/component/file_2141172/RothPSI08_Paper_v9.pdf

Recent analysis of key plasma wall interactions issues for ITER

Energy dependence of the ion-induced sputtering yields of monatomic solids

Effects of the plasma boundary can have a substantial influence on the behaviour of the entire plasma in tokamaks. Progress in the field, particularly that over the last decade, is reviewed, with emphasis on experimental observation. Simple modelling for interpretation is also included.

Plasma boundary phenomena in tokamaks

Sputtering by ion bombardment theoretical concepts

In this work, graphene layers on SiO2/Si substrate have been chemically decorated by radio frequency hydrogen plasma Hydrogen coverage investigation by Raman spectroscopy and micro-X-ray photoelectron spectroscopy characterization demonstrates that the hydrogenation of single layer graphene on SiO2/Si substrate is much less feasible than that of bilayer and multilayer graphene Both the hydrogenation and dehydrogenation process of the graphene layers are controlled by the corresponding energy barriers, which show significant dependence on the number of layers The extent of decorated carbon atoms in graphene layers can be manipulated reversibly up to the saturation coverage, which facilitates engineering of chemically decorated graphene with various functional groups viaplasma techniques

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Thickness-dependent reversible hydrogenation of graphene layers.

Sputtering yields for different ions and materials at low ion energies have a similar energy dependence. Due to this similarity, yield data can be characterized by a normalized energy function and two parameters for each ion target combination. One of these parameters is the threshold energy. An energy scaling can be based on this parameter. The other parameter is a multiplication factor. Both parameters depend mainly on the ion and target mass M1 and M2 and on the surface binding energy EB. An analytic expression for the normalized functions and both the parameters is given. This empirical relation also allows an estimate of unknown sputtering data, if M1, M2, and EB are noted. A physical interpretation of the empirical relation is given for the case M1≪M2, as in this case special collision processes which dominate the sputtering can be identified.

An analytical formula and important parameters for low‐energy ion sputtering

An Analytical Formula and Important Parameters for Low-Energy Ion Sputtering: Erratum of the Publication in Journal of Applied Physics Vol. 51, S. 2861 ff, (1980)

The sputtering yields of molybdenum and gold for H+, D+, 3He+, and 4He+ ion irradiation at normal incidence with large irradiation doses have been measured for energies between 150 eV and 20 keV. The yields were determined from the weight loss of the targets. The sputtering yields are strongly influenced by threshold effects for energies below ∼10 keV. It is found that the experimental yields can be described by a yield formula with an energy parameter E′=E/Eth, where Eth is a theoretical threshold energy.

Light‐ion sputtering yields for molybdenum and gold at low energies

Recent developments for plasma edge diagnostics using atomic beams

The relations between plasma wall interaction and plasma core properties are studied by spectroscopic methods applied to the emission of neutral particles at the plasma boundary. The interdependence between the structure of the scrape-off layer (SOL), particle-fluxes and impurity release are analyzed. In particular, the importance of molecule formation for impurity release and particle recycling in a machine with an "all-carbon" surrounding is shown. These mechanisms can lead to a stationary discharge with a cold plasma mantle ("detached plasma"), the properties of which are discussed. Local heating inside the SOL with ICRH is evident and some consequences for gas release and impurity generation are drawn.

H.L. Bay

Papers

An analytical formula and important parameters for low‐energy ion sputtering

An Analytical Formula and Important Parameters for Low-Energy Ion Sputtering: Erratum of the Publication in Journal of Applied Physics Vol. 51, S. 2861 ff, (1980)

Light‐ion sputtering yields for molybdenum and gold at low energies

Recent developments for plasma edge diagnostics using atomic beams

Plasma edge research on TEXTOR