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Title: Time-resolved laser-induced fluorescence measurement of ion and neutral dynamics in a Hall thruster during ionization oscillations

The paper presents spatially and temporally resolved laser-induced fluorescence (LIF) measurements of the xenon ion and neutral velocity distribution functions in a 400 W Hall thruster during natural ionization oscillations at 23 kHz, the so-called “breathing mode.” Strong fluctuations in measured axial ion velocity throughout the discharge current cycle are observed at five spatial locations and the velocity maxima appear in the low current interval. The spatio-temporal evolution of the ion velocity distribution function suggests a propagating acceleration front undergoing periodic motion between the thruster exit plane and ~1 cm downstream into the plume. In conclusion, the ion LIF signal intensity oscillates almost in phase with the discharge current, while the neutral fluorescence signal appears out of phase, indicating alternating intervals of strong and weak ionization.
Authors:
 [1] ; ORCiD logo [1] ;  [1]
  1. Stanford Plasma Physics Lab., Stanford, CA (United States)
Publication Date:
Grant/Contract Number:
FC52-08NA28752
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 118; Journal Issue: 23; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Research Org:
Krell Inst., Ames, IA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1468469
Alternate Identifier(s):
OSTI ID: 1229792

Fabris, Andrea Lucca, Young, Christopher V., and Cappelli, Mark A.. Time-resolved laser-induced fluorescence measurement of ion and neutral dynamics in a Hall thruster during ionization oscillations. United States: N. p., Web. doi:10.1063/1.4937272.
Fabris, Andrea Lucca, Young, Christopher V., & Cappelli, Mark A.. Time-resolved laser-induced fluorescence measurement of ion and neutral dynamics in a Hall thruster during ionization oscillations. United States. doi:10.1063/1.4937272.
Fabris, Andrea Lucca, Young, Christopher V., and Cappelli, Mark A.. 2015. "Time-resolved laser-induced fluorescence measurement of ion and neutral dynamics in a Hall thruster during ionization oscillations". United States. doi:10.1063/1.4937272. https://www.osti.gov/servlets/purl/1468469.
@article{osti_1468469,
title = {Time-resolved laser-induced fluorescence measurement of ion and neutral dynamics in a Hall thruster during ionization oscillations},
author = {Fabris, Andrea Lucca and Young, Christopher V. and Cappelli, Mark A.},
abstractNote = {The paper presents spatially and temporally resolved laser-induced fluorescence (LIF) measurements of the xenon ion and neutral velocity distribution functions in a 400 W Hall thruster during natural ionization oscillations at 23 kHz, the so-called “breathing mode.” Strong fluctuations in measured axial ion velocity throughout the discharge current cycle are observed at five spatial locations and the velocity maxima appear in the low current interval. The spatio-temporal evolution of the ion velocity distribution function suggests a propagating acceleration front undergoing periodic motion between the thruster exit plane and ~1 cm downstream into the plume. In conclusion, the ion LIF signal intensity oscillates almost in phase with the discharge current, while the neutral fluorescence signal appears out of phase, indicating alternating intervals of strong and weak ionization.},
doi = {10.1063/1.4937272},
journal = {Journal of Applied Physics},
number = 23,
volume = 118,
place = {United States},
year = {2015},
month = {12}
}