Comparison of Numerical and Experimental Time-Resolved Near-Field Hall Thruster Plasma Properties

2012 ◽  
Author(s):  
Ashley Gonzales ◽  
Michelle Scharfe ◽  
Justin Koo ◽  
William Hargus
Keyword(s):  
Near Field ◽  
Hall Thruster ◽  
Plasma Properties ◽  
Time Resolved ◽  
Experimental Time

scholarly journals Numerical and Experimental Investigation of Longitudinal Oscillations in Hall Thrusters

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 148
Author(s):  
Vittorio Giannetti ◽  
Manuel Martín Saravia ◽  
Luca Leporini ◽  
Simone Camarri ◽  
Tommaso Andreussi
Keyword(s):  
Discharge Current ◽  
Fluid Model ◽  
Low Frequency ◽  
Hall Thruster ◽  
Hall Thrusters ◽  
Current Signal ◽  
Plasma Parameters ◽  
Plasma Properties ◽  
Breathing Mode ◽  
Spatio Temporal

One of the main oscillatory modes found ubiquitously in Hall thrusters is the so-called breathing mode. This is recognized as a relatively low-frequency (10–30 kHz), longitudinal oscillation of the discharge current and plasma parameters. In this paper, we present a synergic experimental and numerical investigation of the breathing mode in a 5 kW-class Hall thruster. To this aim, we propose the use of an informed 1D fully-fluid model to provide augmented data with respect to available experimental measurements. The experimental data consists of two datasets, i.e., the discharge current signal and the local near-plume plasma properties measured at high-frequency with a fast-diving triple Langmuir probe. The model is calibrated on the discharge current signal and its accuracy is assessed by comparing predictions against the available measurements of the near-plume plasma properties. It is shown that the model can be calibrated using the discharge current signal, which is easy to measure, and that, once calibrated, it can predict with reasonable accuracy the spatio-temporal distributions of the plasma properties, which would be difficult to measure or estimate otherwise. Finally, we describe how the augmented data obtained through the combination of experiments and calibrated model can provide insight into the breathing mode oscillations and the evolution of plasma properties.

scholarly journals Time-Resolved Emission Spectroscopy Measurements during the Restrike Period in Arc Plasma Torch

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Alan Mašláni ◽  
Peter Ondáč ◽  
Viktor Sember ◽  
Milan Hrabovský
Keyword(s):  
Plasma Torch ◽  
Temporal Evolution ◽  
Argon Plasma ◽  
Anode Surface ◽  
Temperature Profiles ◽  
Arc Plasma ◽  
Electrical Measurements ◽  
Plasma Properties ◽  
Time Resolved ◽  
Arc Plasma Torch

Simultaneous optical, spectroscopic, and electrical measurements in the region of the arc anode attachment of the water-argon plasma torch are presented. A movement of the arc attachment along the anode surface together with its restrike mode is monitored. Temporal evolution of temperature during one cycle of the restrike mode is obtained in three different axial positions in the plasma column. Resulting temperature profiles show how the position of the arc attachment influences the plasma properties.

A fast convergence fourth-order Vlasov model for Hall thruster ionization oscillation analyses

2021 ◽  
Author(s):  
Zhexu Wang ◽  
Rei Kawashima ◽  
Kimiya Komurasaki
Keyword(s):  
Fourth Order ◽  
Fluid Model ◽  
Velocity Distribution Function ◽  
Hall Thruster ◽  
Test Case ◽  
Ionization Source ◽  
Plasma Properties ◽  
Constrained Interpolation ◽  
Derivative Term ◽  
Pic Method

Abstract A 1D1V hybrid Vlasov-fluid model was developed for this study to elucidate ionization oscillations of Hall thrusters (HTs). The Vlasov equation for ions velocity distribution function (IVDF) with ionization source term is solved using a constrained interpolation profile conservative semi-Lagrangian (CIP-CSL) method. The fourth-order weighted essentially non-oscillatory (4th WENO) limiter is applied to the first derivative term to minimize numerical oscillation in the discharge oscillation analyses. The fourth-order spatial accuracy is verified through a 1D scalar test case. Nonoscillatory and high-resolution features of the Vlasov model are confirmed by simulating the test cases of the Vlasov–Poisson (VP) system and by comparing the results with a particle-in-cell (PIC) method. A 1D1V Hall thruster simulation is performed through the hybrid Vlasov-fluid model. The ionization oscillation is analysed. The macroscopic plasma properties are compared with those obtained from a hybrid PIC method. The comparison indicates that the hybrid Vlasov-fluid model yields noiseless results and that the steady-state waveform is calculable in a short time period.

scholarly journals Time-resolved terahertz time-domain near-field microscopy

2018 ◽  
Vol 26 (24) ◽  
pp. 32118 ◽  
Author(s):  
N. J. J. van Hoof ◽  
S. E. T. ter Huurne ◽  
J. Gómez Rivas ◽  
A. Halpin
Keyword(s):  
Time Domain ◽  
Near Field ◽  
Time Resolved

Investigations on Phonon-Assisted Relaxation Mechanisms in CdSe/ZnSe Quantum Islands Using Time-Resolved Near-Field Spectroscopy

2002 ◽  
Vol 190 (2) ◽  
pp. 533-536 ◽  
Author(s):  
B. Dal Don ◽  
R. Dianoux ◽  
S. Wachter ◽  
E. Kurtz ◽  
G. von Freymann ◽  
...  
Keyword(s):  
Near Field ◽  
Time Resolved ◽  
Field Spectroscopy
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