25:T52e,Abstract Hall-effect thrusters (HETs) are among the most commonly used propulsion systems for attitude and orbit control of satellites. As an arrangement in a cluster or individually, equipped with a mechanical suspension, thrust in all three spatial directions can be generated, but requires additional mechanisms and components. Therefore, the Technische Universität Dresden (TU Dresden) is currently working on a concept for developing a Hall-effect thruster with integrated thrust vector control, which would allow steering in all three spatial directions with just a single thruster. This new concept is intended to work solely by influencing the ion beam and should not have any additional mechanical components. The HET will come with a segmented anode to set different electrical potentials at the anode and cause an inhomogeneous distribution of the electric field within the discharge channel, which results in an inhomogeneous force vector distribution at the exit plane. It is assumed that this will generate turning moments around the center of gravity. Deliberately causing those turning moments can therefore be used for steering with just one thruster. This work presents the concept of the propulsion system, gives an outlook on the advantages of its technology and shows capabilities for space applications.26:T4d9,Abstract Two dimensional mappings of the floating potential, Ar II emission and ion saturation currents are used to characterize an 80 cm long magnetized rf plasma column. The data brings new evidence supporting that the level of ion magnetization under the rf loop antenna plays an important role for the efficient generation of plasma over an extended region when the magnetic nozzle is sufficiently separated from the antenna. Densities up to $$10^{18}$$ 10 18 m $$^{-3}$$ - 3 and a blue core are observed for an rf power of 200 W and magnetic fields above 400 G when ions are magnetized. The local wall charging under the antenna is probed and observed to change coherently with the local ion magnetization and seems critical to the global creation and transport of energetic electrons, which are indirectly observed far from the antenna when the ion Larmor radius is much smaller than the glass tube radius over the entire region of investigation.27:T4bd,Abstract Plasma instabilities in the plume of hollow cathodes have been extensively researched in particular for high-current operation. The rise of plume mode ionization-like instability leads to a degradation of cathode’s performance along with the emergence of highly energetic ions that can produce sputtering of various cathode’s surfaces. Numerical simulations using 2D fluid or hybrid codes brought forward an interesting correlation between the evolution of ion acoustic turbulence (IAT) and emergence of plume mode oscillations. Such numerical findings were proven to be true by experimental measurements of wave dispersion and plume mode-IAT correlation in the plume of cathodes emitting currents >10 A. This study brings forward evidence of the correlation between plume mode oscillations and IAT in the plume of low-current cathodes operating with Kr at sub-ampere current levels. It is shown that at <1 A the plume mode instability is highly correlated with the IAT and the anomalous electron collision drives the electron transport in the cathode plume. The fluctuations in IAT wave energy lead to large temperature oscillations which then drive fluctuations in the density via ionization.

#	Concept	H-Index	Publications	Citations
1	Engineering	10	10	162
2	Applied Physics	6	6	96
3	Chemical Engineering	2	2	29
4	Chemistry	2	2	22
5	Electrical Engineering	2	2	30

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