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Cross-section view of a Hall effect thruster. The symbol e stands for electron, a for atom and i for ion. The channel exit plane is referred to as x = 0 in this work.

Cross-section view of a Hall effect thruster. The symbol e stands for electron, a for atom and i for ion. The channel exit plane is referred to as x = 0 in this work.

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The temporal characteristics of the Xe$^+$ ion axial Velocity Distribution Function (VDF) were recorded in the course of low-frequency discharge current oscillations ($\sim$~14 kHz) of the 5 kW-class PPS$\circledR$X000 Hall thruster. The evolution in time of the ion axial velocity component is monitored by means of a laser induced fluorescence diag...

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Context 1
... Hall effect thruster is a low-pressure DC discharge in crossed electric and magnetic fields configuration [2,3,4]. Xenon is generally used as a propellant gas due to its high atomic mass and low ionization energy. A schematic of a HET is depicted in Fig. 1. The anode is located at the upstream end of a coaxial annular dielectric channel that confines the plasma. The cathode is situated outside. A set of coils combined with magnetic parts provide a radially directed magnetic field B of which the strength is maximum in the vicinity of the channel exhaust. The magnetic field is chosen ...
Context 2
... x is the position and d refers to the distance. The time-dependent electric field is plotted in Fig. 10 for the area that ranges between -2.5 mm and the exit plane. The electric field is found to oscillate with a period T ≈ 90 µs, i.e. f ≈ 11 kHz, around a mean value of about 215 V/cm disregarding the power-off period. This value is close to the value of 245 V/cm found by way of time-averaged laser spectroscopy [15]. The amplitude of the ...
Context 3
... laser spectroscopy [15]. The amplitude of the field oscillations is, however, relatively weak. Over the first free oscillation that extends from t = 75 µs until t = 165 µs the amplitude varies at most from 190 V/cm to 240 V/cm, therefore, the electric field variation is in the range ±10 % ahead of the thruster channel exhaust. Finally, in Fig. 10, one can also notice the slow rise of the electric field magnitude from 100 V/cm at 10 µs to 250 V/cm at 30 µs. This temporal evolution is likely to be connected with the time it takes for the establishment of an equilibrium state for both the discharge and the Hall ...

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