Hypervelocity Impacts and Dusty Plasma Lab (HIDPL)
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Browsing Hypervelocity Impacts and Dusty Plasma Lab (HIDPL) by Author "Dropmann, Michael"
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Item Comparison of Plasma Magnetic Field Interactions in a Static and Dynamic Plasma Facility(Transactions of the Japan Society for Aeronautical and Space Sciences, Aerospace Technology Japan, 2016) Dropmann, Michael; Knapp, A.; Eichhorn, C.; Loehle, S.; Laufer, Rene; Herdrich, Georg; Matthews, Lorin Swint.; Hyde, Truell Wayne.; Fasoulas, Stefanos; Roeser, Hans-PeterMagnetic fields are a principal/widespread/promising tool/instrument in space technology design for the use in advanced propulsion concepts, shielding from radiation or to aid thermal protection during the atmospheric entry of spacecraft. Two experiments have been conducted to investigate the feasibility of using magnetic fields to reduce the heat flux onto a thermal protection system during atmospheric entry. For this purpose a modified heat flux probe with embedded permanent magnets has been exposed to a plasma jet and the structure of the bow shock in front of the probe has been observed using an emission spectroscopy setup. The intensity ratio of ionized argon lines for the experiment with and without magnets has been determined and used to analyze the magnetic field`s impact on the flow. Complementary experiments in a low power capacitively driven plasma have been conducted using micron sized particles as probes to map electric fields in a magnetically perturbed plasma. The results from both experiments are presented and analogies are drawn from both approaches. The experiments have shown that the interactions of the magnetic field with the plasma can create strong electric fields which strongly influence the ions even though the field is too weak to magnetize the ions.Item Electrical Conductivity of the Thermal Dusty Plasma under the Conditions of a Hybrid Plasma Environment Simulation Facility(New Journal of Physcis, 2015-05-27) Zhukhovitskii, D.; Petrov, O.; Hyde, Truell Wayne.; Herdrich, Georg; Laufer, Rene; Dropmann, Michael; Matthews, Lorin Swint.We discuss the inductively heated plasma generator (IPG) facility in application to the generation of the thermal dusty plasma formed by the positively charged dust particles and the electrons emitted by them. We develop a theoretical model for the calculation of plasma electrical conductivity under typical conditions of the IPG. We show that the electrical conductivity of dusty plasma is defined by collisions with the neutral gas molecules and by the electron number density. The latter is calculated in the approximations of an ideal and strongly coupled particle system and in the regime of weak and strong screening of the particle charge. The maximum attainable electron number density and corresponding maximum plasma electrical conductivity prove to be independent of the particle emissivity. Analysis of available experiments is performed, in particular, of our recent experiment with plasma formed by the combustion products of a propane–air mixture and the CeO2 particles injected into it. A good correlation between the theory and experimental data points to the adequacy of our approach. Our main conclusion is that a level of the electrical conductivity due to the thermal ionization of the dust particles is sufficiently high to compete with that of the potassium-doped plasmas.Item A New Inductively Driven Plasma Generator (IPG6)—Setup and Initial Experiments(IEEE Transactions on Plasma Science, 2013-04) Dropmann, Michael; Herdrich, Georg; Laufer, Rene; Puckert, Dominik; Fulge, Hannes; Fasoulas, Stefanos; Schmoke, Jimmy; Cook, Mike; Hyde, Truell Wayne.As part of the partnership between the Center for Astrophysics, Space Physics and Engineering Research (CASPER) at Baylor University and the Institute of Space Systems (IRS) at the University of Stuttgart, a new design for a modular inductively driven plasma generator (IPG) is being developed and tested within CASPER and the IRS. The current IPG design is built on a well-established heritage of modular IPGs designed and operated at IRS. This latest IPG source enables the electrodeless generation of high-enthalpy plasmas and will provide CASPER researchers with the ability to operate with various gases at plasma powers of approximately 15 kW. It will also provide minimized field losses and operation over a wide scope of parameters not possible using existing designs requiring flow-controlled stabilization. The setup of the two facilities in Stuttgart (IPG6-S) and at Baylor (IPG6-B) is described, and results from the first characterization with air plasma are presented. Furthermore, the objectives of the test facilities will be described shortly.