D. Gawron's research while affiliated with French National Centre for Scientific Research and other places

... a) Inner wall temperature b) Outer wall temperature [4,29]. Ions are strongly accelerated at the channel outlet where the axial electric field is high [30]. Calculations done by Shastry of the incident ion power density from wall-mounted Langmuir probe data indicate that the profile of net power density deposited to the channel wall is a combination of the decrease in ion current density and the increase in ion energy as the exit plane is approached [22]. ...

... Reconstruction of the full ion velocity phase space via tomographic LIF spectroscopy was demonstrated [43]. LIF spectroscopy with time-resolution enhancing approaches allowed for investigation of plasma oscillation phenomena [27,[44][45][46][47][48][49][50]. Moreover, the effects of finite facility background pressures on ionization and acceleration have been addressed [51,52]. ...

... The electron transport was predicted to be Bohm type and linked to the electron-wall collisions. Boniface et al. [93] showed that the cross-field transport was present primarily due to plasma fluctuations, whereas, electron collisions had minimal effect. The experimental results showed that for high power thrusters, the Bohm transport and collisions are unable to predict anomalous transport. ...

... The precision of measured velocities has been found, in various studies, to be less than the experimental uncertainty for the ions (±500 m/s). 15,16,17 Several factors affect the lineshape and give rise to broadening and/or a shift of the spectral line. In hightemperature plasmas, the most significant is Doppler broadening due to the absorber's random thermal motion, characterized by the atomic, or ionic, kinetic temperature, T kin . ...

... There do exist other non-invasive techniques that have been applied to a Hall thruster channel plasma, but often their measurements are not specific enough to be helpful here. For example, Hall current tomography could yield the perpendicular electric field but plasma density must also be known [86]; similarly, Fabry-Pérot spectroscopy could provide an approximate measurement of ion density, but these measurements are line-integrated and require numerical modeling [142]. Alternatively, high-fidelity simulation could be used for some degree of verification, but as there are no self-consistent Hall thruster codes to date, the simulation itself would need to be validated in other ways. ...

... The structure of the ion acceleration region is of great importance in Hall thruster plasma research because it has a strong influence not only on ionization and acceleration but also on the performance and lifetime of thrusters. It is known that adjusting the anode voltage or propellant flow rate leads to a shift or modification of the electric field profile, and this behavior depends on the thruster geometry and the magnetic field topology [1][2][3][4]. The magnetic field is especially a key variable that can significantly affect the ion acceleration region. ...

... When the trim coil current was reduced from +6 A to −10 A, the magnetic field strength gradually decreased. However, decreased magnetic field strength could shift the acceleration zone of plasma downstream along the axis of the thruster channel [50][51][52], which is contradictory to the constricted plasma toward the discharge channel. ...