Speaker
Andre Melzer
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/I4.J502.pdf
Optical diagnostics of complex plasmas
A. Melzer1 , M. Himpel1 , H. Krüger1 , M. Mulsow1 , S. Schütt1
1 Institute of Physics, Ernst-Moritz-Arndt-University Greifswald, Germany
Particle-containing (dusty) plasmas offer and require the development of sophisticated diag-
nostic techniques to measure particle motion, particle density, particle size and even particle
charge.
The determination of the three-dimensional trajectory of particle on the individual kinetic
level can be achieved by stereoscopy using multiple cameras. This can be used to study, e.g.,
vortex flows in dust clusters with more than 1000 particles or wave motion in a restricted volume
of of extended dust clouds.
Optical tomography reveals the spatially resolved particle density in dense dust systems from
angle-resolved absorption measurements. Further, Mie scattering allows to measure the size
and size distribution of particles trapped in the plasma. Here, the long-time evolution of the
confinement of the dust clouds as well as dust particle sputtering processes can be investigated.
Finally, in the infrared spectral regime the light-scattering properties of particles can reveal
the charge state of the particles from the blue-shift of the optical phonon resonance in certain
types of materials.
The talk will give an overview over the diagnostics and some recent applications.
