Stuttgart 2012 – wissenschaftliches Programm
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SYGP: Symposium Gemeinsame Probleme in Fusions- und astrophysikalischen Plasmen
SYGP 2: Posters
SYGP 2.1: Poster
Montag, 12. März 2012, 16:00–16:30, Poster.V
Impact plasma study for middle velocity micro sized particle — •Yanwei Li1,2,3, Ralf Srama1,2, Yiyong Wu3, and Sebastian Bugiel2 — 1Universität Stuttgart, Stuttgart, Germany — 2Max Planck Institute for Nuclear Physics, Heidelberg, Germany — 3Harbin Institute of Technology, Harbin, China
Micron-sized olivine and iron particles have been accelerated in order to characterize their impact plasma. The experiments were carried out at the 2MV accelerator at the Max Planck Institute for Nuclear Physics in Heidelberg. The particle diameters and velocities were 0.3~1.2μm and 3~7km/s, respectively. The targets were polished Aluminum surfaces. Based on the experimental results, impact charge has a relationship with particle mass m and velocity v like Q=kmαvβ. The velocity range chosen generates does not lead to a full particle vaporization but rather generate a large amount of ejected fragments. The charge generation mechanism and its interaction with ejected particles is discussed. These fragments affect the impact charge values and lead the difficulties to find out the values of k, α and β. Furthermore, olivine particles could create more impact charge compared to iron particles. Two physical phenomena are considered: the influence of the particle shape and the ionization energy of the materials. The ionization energy of magnesium, iron and aluminum strongly affects the charge yield of the hyper-velocity impact process.