Video tracking and post - mortem analysis of dust particles from all tungsten ASDEX - Upgrade

2D dust particle trajectories are extracted from fast framing camera videos of ASDEXUpgrade (AUG) by a new timeand resource-efficient code and classified into stationary hot spots, single-frame events and real dust particle fly-bys. Using hybrid global and local intensity thresholding and linear trajectory extrapolation individual particles could be tracked up to 80 ms. Even under challenging conditions such as high particle density and strong vacuum vessel illumination all particles detected for more than 50 frames are tracked correctly. During campaign 2009 dust has been trapped on 5 silicon wafer dust collectors strategically positioned within the vacuum vessel of the full tungsten AUG. Characterisation of the outer morphology and determination of the elemental composition of 5×10 particles were performed via automated PACS: 28.52.Nh, 82.80.Ej, 68.37.Hk JNM keywords: Electron Microscopy, Plasma-Materials Interaction, Safety of Nuclear Reactors and Components, Tungsten, Tungsten Alloys and Compounds, Mathematical and Computational Methods PSI-19 keywords: ASDEX-Upgrade, Dust, Particle control, Scanning electron microscopy, Tungsten * Corresponding author address: Boltzmannstr. 2, 85748 Garching b. München, Germany. * Corresponding author E-mail: [email protected] Presenting author: Nikolaus Endstrasser Presenting author e-mail: [email protected]