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CONTROL OF VOLTAGE PLASMA OSCILLATIONS IN A DC DISCHARGE WITH AN EXTERNAL AUXILIARY ELECTRODE

DOE Plasma Science Center Control of Plasma Kinetics. CONTROL OF VOLTAGE PLASMA OSCILLATIONS IN A DC DISCHARGE WITH AN EXTERNAL AUXILIARY ELECTRODE. Dc discharges with a hot cathode (diode regime) may suffer current and voltage plasma oscillations, which may be deleterious to its operation .

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CONTROL OF VOLTAGE PLASMA OSCILLATIONS IN A DC DISCHARGE WITH AN EXTERNAL AUXILIARY ELECTRODE

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  1. DOE Plasma Science Center Control of Plasma Kinetics CONTROL OF VOLTAGE PLASMA OSCILLATIONS IN A DC DISCHARGE WITH AN EXTERNAL AUXILIARY ELECTRODE • Dc discharges with a hot cathode (diode regime) may suffer current and voltage plasma oscillations, which may be deleterious to its operation. • The oscillations can be supressed by installing an auxiliary electrode, placed outside of the anode. • By collecting a modest current through a small opening in the anode (triode regime), the discharge becomes stable in certain pressure ranges. • IV-traces for diode and triode regimes • Experimental Device HIGHLIGHT PLSC_0912

  2. DETERMINISTIC KINETIC SIMULATION FOR NON-EQUILIBRIUM PLASMAS DOE Plasma Science Center Control of Plasma Kinetics • In order to understand and predict the behavior of non-equilibrium plasmas, velocity distribution functions (VDFs) must be obtained accurately. • For the discharge plasma of a Hall thruster, using a deterministic kinetic (DK) simulation method that solves the Boltzmann equation directly, improved resolution of VDFs is achieved in comparison to a particle-in-cell (PIC) method. • Temporally and spatially well resolved plasma properties are obtained (a) PIC (b) DK • Ion number density. x-axis: time, y-axis: position • Discharge current vs. time • Ion VDF at the channel exit of a Hall thruster. (a) PIC, (b) DK HIGHLIGHT PLSC_0912

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