Optical investigation on plasma investigations of SPT thrusters

Darnon, Franck; Lyszyk, M.; Bouchoule, A.

doi:10.2514/6.1997-3051

Cited by 11 publications

(10 citation statements)

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“…al., used was a charge-coupled device with an image intensifier. 11 Subsequently, Lobbia, Liu, and Gallimore studied a cluster of annular Hall thrusters using a commercial high-speed camera 21 while Parker, Raitses, and Fisch studied a cylindrical Hall thruster. 22 Shortly after, McDonald developed a Fourier-transform technique to study both breathing and spokes mode in annular Hall thrusters.…”

Section: Past Workmentioning

confidence: 98%

“…6 Since the 1960's, many studies have been performed to characterize these oscillations. [7][8][9][10][11][12][13][14][15][16][17][18][19][20] Yet the roles of these oscillations in relation to thruster performance and life-time are still largely unknown. Currently, there are two oscillation modes that are believed to be important to Hall thruster operations, the "breathing" mode and the "spokes" mode.…”

Section: Past Workmentioning

confidence: 99%

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Effect of Background Pressure on the Plasma Oscillation Characteristics of the HiVHAc Hall Thruster

Huang

Kamhawi²,

Lobbia³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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During a component compatibility test of the NASA HiVHAc Hall thruster, a number of plasma diagnostics were implemented to study the effect of varying facility background pressure on thruster operation. These diagnostics characterized the thruster performance, the plume, and the plasma oscillations in the thruster. Thruster performance and plume characteristics as functions of background pressure were previously published. This paper focuses on changes in the plasma oscillation characteristics with changing background pressure. The diagnostics used to study plasma oscillations include a high-speed camera and a set of high-speed Langmuir probes. The results show a rise in the oscillation frequency of the "breathing" mode with rising background pressure, which is hypothesized to be due to a shortening acceleration/ionization zone. An attempt is made to apply a simplified ingestion model to the data. The combined results are used to estimate the maximum acceptable background pressure for performance and wear testing.

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Section: Past Workmentioning

confidence: 98%

Section: Past Workmentioning

confidence: 99%

Effect of Background Pressure on the Plasma Oscillation Characteristics of the HiVHAc Hall Thruster

Huang

Kamhawi²,

Lobbia³

et al. 2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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show abstract

“…16,17,[41][42][43] By rendering black and white images from a view downstream of the thruster, high speed imaging yields measurements of variations in light intensity that happen on a time scale slower than the frame rate of the camera. This permits a noninvasive assessment of the spatial and time dependent fluctuations at the thruster face and inside the channel.…”

Section: High Speed Imagingmentioning

confidence: 99%

Low Frequency Plasma Oscillations in a 6-kW Magnetically Shielded Hall Thruster

Jorns

Hofer

2013

49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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The oscillations from 0-100 kHz in a 6-kW magnetically shielded thruster are experimentally characterized. Changes in plasma parameters that result from the magnetic shielding of Hall thrusters have the potential to significantly alter thruster transients. A detailed investigation of the resulting oscillations is necessary for the purpose of determining the underlying physical processes governing time-dependent behavior in magnetically shielded thrusters as well as for improving thruster models. In this investigation, a high speed camera and a translating ion saturation probe are employed to examine the spatial extent and nature of oscillations from 0-100 kHz in the H6MS thruster. Two modes are identified at 7-12 kHz and 75-90 kHz. The low frequency mode is azimuthally uniform across the thruster face while the high frequency oscillation is concentrated close to the centerline-mounted cathode with an m = 1 azimuthal dependence. These experimental results are discussed in the context of wave theory as well as published observations from an unshielded variant of the H6MS thruster. Nomenclature B 0 Background magnetic field c s Ion sound speed E r Electric field in radial direction f b Breathing mode frequency F Fourier transform with respect to time I v (r, θ, t) Light intensity at position (r, θ) and time t I v (r, θ) Mean light intensity at position (r, θ) I v (r, θ, t) Light intensity normalized by the mean value I r,j Azimuthally binned light intensity i sat (r, t) Ion saturation current at radius r and fixed axial position i sat (r, t) Mean ion saturation current at radius r and fixed axial position I sat (r, t) Ion saturation current normalized by the mean value k z Component of wavenumber in axial direction L i Length of ionization zone m e,i Electron, ion mass N b Number of azimuthal bins n e,i Electron, ion density q Fundamental charge * Associate Engineer,

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Section: Past Workmentioning

confidence: 99%

Effect of Background Pressure on the Plasma Oscillation Characteristics of the HiVHAc Hall Thruster

Huang¹,

Kamhawi²,

Lobbia³

et al. 2014

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)Air Force Research Laboratory (AFMC) AFRL/RQR 5 Pollux Drive SPONSOR/MONITOR'S REPORTEdwards AFB CA 93524-7048 NUMBER(S) AFRL-RQ-ED-TP-2014-226 DISTRIBUTION / AVAILABILITY STATEMENTDistribution A: Approved for Public Release; Distribution Unlimited SUPPLEMENTARY NOTESTechnical paper presented at 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Cleveland, OH, 28-30 July, 2014. PA#14392 ABSTRACTDuring a single-string integration test of the NASA HiVHAc Hall thruster, a number of plasma diagnostics were implemented to study the effect of varying facility background pressure on thruster operation. These diagnostics characterized the thruster performance, the plume, and the plasma oscillations in the thruster. Thruster performance and plume characteristics as functions of background pressure were previously published. This paper will focus on changes in the plasma oscillation characteristics with changing background pressure. The diagnostics used to study plasma oscillations include a high-speed camera and a set of high-speed Langmuir probes. The results show a rise in the oscillation frequency of the "breathing" mode with rising background pressure, which is hypothesized to be due to a shortening acceleration/ionization zone. An attempt is made to apply a simplified ingestion model to the data. The combined results are used to estimate the maximum acceptable background pressure for performance and wear testing. During a single-string integration test of the NASA HiVHAc Hall thruster, a number of plasma diagnostics were implemented to study the effect of varying facility background pressure on thruster operation. These diagnostics characterized the thruster performance, the plume, and the plasma oscillations in the thruster. Thruster performance and plume characteristics as functions of background pressure were previously published. This paper will focus on changes in the plasma oscillation characteristics with changing background pressure. The diagnostics used to study plasma oscillations include a high-speed camera and a set of high-speed Langmuir probes. The results show a rise in the oscillation frequency of the "breathing" mode with rising background pressure, which is hypothesized to be due to a shortening acceleration/ionization zone. An attempt is made to apply a simplified ingestion model to the data. The combined results are used to estimate the maximum acceptable background pressure for performance and...

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Optical investigation on plasma investigations of SPT thrusters

Cited by 11 publications

References 0 publications

Effect of Background Pressure on the Plasma Oscillation Characteristics of the HiVHAc Hall Thruster

Effect of Background Pressure on the Plasma Oscillation Characteristics of the HiVHAc Hall Thruster

Low Frequency Plasma Oscillations in a 6-kW Magnetically Shielded Hall Thruster

Effect of Background Pressure on the Plasma Oscillation Characteristics of the HiVHAc Hall Thruster

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