NDLI: Optical characterization of component wear and near-field plasma of the hermes thruster

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Optical characterization of component wear and near-field plasma of the hermes thruster

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kamhawi, Hani Williams Jr., George J.
Copyright Year	2015
Description	Optical emission spectral (OES) data are presented which correlate trends in sputtered species and the near-field plasma with the Hall-Effect Rocket with Magnetic Shielding (HERMeS) thruster operating condition. The relative density of singly-ionized xenon (Xe II) is estimated using a collisional-radiative model. OES data were collected at three radial and several axial locations downstream of the thruster's exit plane. These data were deconvolved to show the structure for the near-field plasma as a function of thruster operating condition. The magnetic field is shown to have a much greater affect on plasma structure than the discharge voltage with the primary ionization/acceleration zone boundary being similar for all nominal operating voltages at constant power. OES measurement of sputtered boron shows that the HERMeS thruster is magnetically shielded across its operating envelope. Preliminary assessment of carbon sputtered from the keeper face suggest it increases significantly with operating voltage, but the uncertainty associated with these measurements is very high.
File Size	617126
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20150023086
Archival Resource Key	ark:/13960/t24b83371
Language	English
Publisher Date	2015-06-01
Access Restriction	Open
Subject Keyword	Electric Propulsion Plumes Spectroscopy Electric Potential Plasmas Physics Solar Electric Propulsion Xenon Hall Effect Optical Equipment Sputtering Magnetic Shielding Hall Thrusters Boron Emission Spectra Wear Near Fields Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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