Abstract
Jets of energetic ions launched at laser-burnt-through foils represent an efficient tool for investigation of plasma interaction with solid surfaces (plasma-wall interaction, PWI) and for description of transient phenomena occurring close to the walls. Highly charged ions approaching the secondary target interpenetrate the near surface layer, collide with the counter-propagating matter and capture a large number of electrons. This results in a creation of atoms in highly excited Rydberg states or hollow ions with multiple inner vacancies; plasma jet and target ions may also undergo charge exchange (CE) processes. We report PWI experiments with Al/Si(PMMA) and Al/C targets irradiated at normal or oblique laser incidence. The distinct dip structures observed in red wings of Al Lyγ self-emission is interpreted in terms of CE between C6+ and Al12+ in the near-wall zone. The spectroscopic identification of CE phenomena is supported by results of analytical and numerical calculations.
Highlights
Plasma-wall interaction research directed at investigation of various mechanisms of the energy transfer in the near-wall region contributes to a detailed understanding of the material erosion and migration at surfaces of plasma facing components, providing application-important data necessary to a development of new-generation fusion reactors.Well-defined jets of energetic laser-produced plasmas provide in combination with precise x-ray spectroscopy very sensitive and flexible tools for studying these effects
Charged ions approaching the secondary target interpenetrate the near surface layer, collide with the counter-propagating matter and capture a large number of electrons. This results in a creation of atoms in highly excited Rydberg states or hollow ions with multiple inner vacancies; plasma jet and target ions may undergo charge exchange (CE) processes
We report PWI experiments with Al/Si(PMMA) and Al/C targets irradiated at normal or oblique laser incidence
Summary
Plasma-wall interaction research directed at investigation of various mechanisms of the energy transfer in the near-wall region (e.g., ion deceleration and stopping, shock wave generation, formation of highly excited Rydberg states and hollow atoms, charge transfer and ion neutralization – for relevant Refs. see [1]) contributes to a detailed understanding of the material erosion and migration at surfaces of plasma facing components, providing application-important data necessary to a development of new-generation fusion reactors. See [1]) contributes to a detailed understanding of the material erosion and migration at surfaces of plasma facing components, providing application-important data necessary to a development of new-generation fusion reactors. The charge exchange phenomena were investigated by analysing the spatially resolved, narrow-band x-ray spectra emitted from single-side laser-irradiated double-foil targets. The identification of CE phenomena is supported by complementary diagnostics and by results of analytical and numerical calculations. EPJ Web of Conferences (a) diagnostics secondary target primary target Al foil (b) secondary target
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