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P: Fachverband Plasmaphysik
P 22: Plasma Wall Interaction III
P 22.3: Vortrag
Freitag, 20. März 2026, 09:45–10:00, KH 01.012
Spectroscopic Time-of-Flight Spatial Distribution Measurements of Neon-Sputtered Monocrystalline W at the Linear Plasma Device PSI-2 — •Merlin Klein1, Oleksandr Marchuk1, Marc Sackers1, Arkadi Kreter1, and Sebastijan Brezinsek1,2 — 1Forschungszentrum Jülich GmbH, IFN-1 — 2HHU Düsseldorf, Faculty of Mathematics and Natural Sciences
Tungsten (W) is a plasma-facing material (PFM) for fusion reactors. By erosion W atoms can enter the plasma and cool it through radiation losses. The quantity and spatial distribution of sputtered W atoms from PFMs therefore has a direct impact on reactor performance. For energy impacts in the keV range, the sputtered W atoms follow a cosine angular distribution. For lower energies, as typically exist in the divertor region as well, experimental data shows a discrepancy to existing models.
In this experiment, poly- and monocristalline (111) W is exposed to a linear Neon plasma at kinetic energies of about 100 eV. Further excitations of W atoms sputtered into the plasma column allow for the acquisition of multiple line shapes in a spectroscopic time-of-flight (ToF) measurement. The total sputtering yield can be deduced from multiple acquisitions. In this ToF measurement it is possible to differentiate between angular distributions of sputtered W flux, while all other experimental parameters stay fixed.
These new experimental results show deviations in angular distributions between lattice structures and their orientations which can be used to support modelling of low temperature plasma-wall interactions.
Keywords: Tungsten; Erosion; Spectroscopy; Low-Temperature Plasma; Low-Density Plasma