SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.23: Poster
Dienstag, 31. August 2021, 14:00–16:00, P
Optimisation and characterisation of an ion-beam-driven permeation experimental setup — •Philipp Sand1,2, Armin Manhard1, Rodrigo Arrendondo Parra1, and Udo von Toussaint1 — 1Max Planck Institute for Plasma Physics, 85748 Garching, Germany — 2Technical University Munich, 85748 Garching, Germany
Hydrogen permeability is an important property for many materials in future technologies such as, e.g., nuclear fusion. One method to determine permeation properties is to implant deuterium ions from a mass-filtered ion beam with a well-defined flux and energy into a sample foil. At the rear side of the foil, the effusion flux of the permeating species is then measured by a quadrupole mass spectrometer. The ion optics of such a setup is characterised for a 4.7 keV D3+ ion beam. The ions are decelerated by the sample bias voltage to implantation energies of 500 eV per D. The settings are optimised in order to obtain a high ion current to reach reasonable signal intensities and affordable experiment times. Another goal for the optimisation is to minimise the flux of charge exchange neutrals, which are created in the beamline. They will not be decelerated by but impinge on the sample with their full energy. They lead to degradation of the sample material due to displacement damage and sputtering and can also affect the permeation signal. The neutral fraction can potentially be minimised by electrostatically deflecting the beam after passing the volume of highest neutral generation rate. Photographs of the beam footprint are obtained using ion-induced fluorescence on a quartz plate.