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Time-synchronized laser-induced fluorescence in the near-field of a 600 Watt Hall thruster

Young, C. V. ; Lucca Fabris, A. ; MacDonald-Tenenbaum, N. A. ; Hargus, W. A. ; Cappelli, M. A.

Journal of applied physics, 2021-11, Vol.130 (18) [Periódico revisado por pares]

Melville: American Institute of Physics

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  • Título:
    Time-synchronized laser-induced fluorescence in the near-field of a 600 Watt Hall thruster
  • Autor: Young, C. V. ; Lucca Fabris, A. ; MacDonald-Tenenbaum, N. A. ; Hargus, W. A. ; Cappelli, M. A.
  • Assuntos: Downstream effects ; Dynamic tests ; Ground tests ; Ionization ; Laser induced fluorescence ; Near fields ; Signal processing ; Test facilities ; Time measurement ; Time synchronization ; Velocity
  • É parte de: Journal of applied physics, 2021-11, Vol.130 (18)
  • Descrição: We report on the results of an experimental campaign to measure time-varying velocity distributions in the near-field of a low power Hall thruster. We employ a sample-hold technique, enhanced by parallelizing the measurement hardware into several signal processing channels that vastly increases the data acquisition rate. The measurements are applied to study flow field dynamics in a commercial BHT-600 Hall thruster undergoing unforced breathing mode oscillations in the 44–49 kHz range. A very detailed experimental picture of the near-field emerges from these studies. The results indicate that velocity fluctuations lessen further downstream of the exit plane. Along the thruster axis where there is a general appearance of a central jet, there is evidence of a low velocity ion population in between the periodic bursts of high velocity ions, indicative of local ionization of neutrals outside of the thruster. One possible source of this residual ionization may be background chamber gas, which is not unexpected with the limited pumping capacity of ground test facilities.
  • Editor: Melville: American Institute of Physics
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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