NDLI: Velocimetry of cathode particles in a magnetoplasmadynamic thruster discharge plasma.

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Preface: High-pressure studies with x-rays.

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Velocimetry of cathode particles in a magnetoplasmadynamic thruster discharge plasma.

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Comment on 'Calibration-independent measurement of complex permittivity of liquids using a coaxial transmission line' [Rev. Sci. Instrum. 86, 014704 (2015)].

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Velocimetry of cathode particles in a magnetoplasmadynamic thruster discharge plasma.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kimberlin, A. Walker, M. Langendorf, S. Walker, J. Polzin, K.
Description	Country affiliation: United States Author Affiliation: Walker J ( School of Aerospace Engineering, Georgia Institute of Technology, 270 Ferst Drive, Atlanta, Georgia 30332, USA.); Langendorf S ( School of Aerospace Engineering, Georgia Institute of Technology, 270 Ferst Drive, Atlanta, Georgia 30332, USA.); Walker M ( School of Aerospace Engineering, Georgia Institute of Technology, 270 Ferst Drive, Atlanta, Georgia 30332, USA.); Polzin K ( Propulsion Research and Technology Applications Branch, NASA-Marshall Space Flight Center, Huntsville, Alabama 35811, USA.); Kimberlin A ( Propulsion Research and Technology Applications Branch, NASA-Marshall Space Flight Center, Huntsville, Alabama 35811, USA.)
Abstract	With high-speed imaging, it is possible to directly observe the time-evolution of the macroscopic behavior of the discharge plasma in a magnetoplasmadynamic thruster (MPDT). By utilizing direct high-speed imaging capable of capturing many images over the course of a single discharge, the velocity of the cathode erosion particles can be measured, opening the possibility of a novel, noninvasive technique for discharge plasma flow field velocimetry. In this work, an 8 kA argon MPDT discharge is imaged at 26 173 fps utilizing a 0.9 neutral density filter. The camera is aligned with thruster centerline 4 m downstream of the thruster exit plane. By tracking visible particles appearing in the multiple images, the particle motion in the radial and azimuthal directions is directly imaged. Through the use of traditional techniques in digital particle image velocimetry, the cathode particles emanating from the discharge are measured to have a mean radial velocity of 44.6 ± 6.0 m/s with a 95% confidence interval and a statistically insignificant azimuthal velocity. The setup and analysis employed permits measurement of the particle velocity in orthogonal direction to the image sensor plane using a single camera. By combining a background removal subtraction technique and knowledge of the optical focal plane, the estimated mean axial velocity of the particles is 1.59 km/s. This investigation ends with a discussion of important factors to consider for future MPDT high-speed imaging particle velocimetry, such as frame-rate, image size, spatial resolution, optics, and data handling selections.
ISSN	00346748
Issue Number	7
Journal	Review of Scientific Instruments
Volume Number	86
e-ISSN	10897623
Language	English
Publisher	American Institute of Physics
Publisher Date	2015-07-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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