EGU21-14909
https://doi.org/10.5194/egusphere-egu21-14909
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

The Effective Temperature of Dust Impact Plasmas — Olivine Dust on Tungsten Target

Jiří Pavlů1, Samuel Kočiščák1, Åshild Fredriksen2, Michael DeLuca3,4, and Zoltan Sternovsky3,4
Jiří Pavlů et al.
  • 1Faculty of Mathematics and Physics, Charles University, Prague, Czechia (jiri.pavlu@mff.cuni.cz)
  • 2Department of Physics and Technology, UiT — The Arctic University of Norway, Tromsø, Norway
  • 3Laboratory forAtmospheric and Space Physics, University of Colorado Boulder, Boulder, USA
  • 4Smead Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, USA

We experimentally observe both positive and negative charge carriers in impact plasma and estimate their effective temperatures. The measurements are carried on a dust accelerator using polypyrrole (PPy)-coated olivine dust particles impacting tungsten (W) target in the velocity range of 2–18 km/s. We measure the retained impact charge as a function of applied bias potential to the control grid. The temperatures are estimated from the data fit. The estimated effective temperatures of the positive ions are approximately 7 eV and seems to be independent of the impact speed. The negative charge carriers' temperatures vary from as low as 1 eV for the lowest speeds to almost ten times higher speeds. The presented values differ significantly from previous studies using Fe dust particles. Yet, the discrepancy can be attributed to a larger fraction of negative ions in the impact plasma that likely originates from the PPy coating.

How to cite: Pavlů, J., Kočiščák, S., Fredriksen, Å., DeLuca, M., and Sternovsky, Z.: The Effective Temperature of Dust Impact Plasmas — Olivine Dust on Tungsten Target, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-14909, https://doi.org/10.5194/egusphere-egu21-14909, 2021.

Corresponding presentation materials formerly uploaded have been withdrawn.