Charge exchange ion number density distribution in Hall thruster plume

The charge exchange (CEX) ions by the collisions between energetic ions and slow neutral particles in a Hall thruster plume are thought a source of the ions coming back to the satellite. Therefore, mechanical plume shielding has been proposed to prevent the CEX ions from spreading out from near exit...

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Veröffentlicht in:Vacuum 2008-09, Vol.83 (1), p.57-60
Hauptverfasser: Yokota, Shigeru, Sakoh, Daichi, Matsui, Makoto, Komurasaki, Kimiya, Arakawa, Yoshihiro
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container_issue 1
container_start_page 57
container_title Vacuum
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creator Yokota, Shigeru
Sakoh, Daichi
Matsui, Makoto
Komurasaki, Kimiya
Arakawa, Yoshihiro
description The charge exchange (CEX) ions by the collisions between energetic ions and slow neutral particles in a Hall thruster plume are thought a source of the ions coming back to the satellite. Therefore, mechanical plume shielding has been proposed to prevent the CEX ions from spreading out from near exit region. In order to optimize the shield length, CEX reactions in the plume were evaluated. Number density distributions of neutral particles were measured by the laser absorption spectroscopy (LAS) targeting the absorption line of XeI 823.16 nm (6s[3/2] 2 0 → 6p[3/2] 2). Ambient neutral gas effect in a test chamber was cancelled out using the measurements at two different back pressures. Measured distribution was compared with the Particle-in-Cell (PIC) and Direct Simulation Monte Carlo (DSMC) analyses. As a result, normalized mean outflow velocity of neutral particles v ¯ z / v th was identified at 0.6, and the computed CEX ion density was found to be decreased from the channel exit by 50% at 80 mm distance.
doi_str_mv 10.1016/j.vacuum.2008.03.024
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source ScienceDirect Journals (5 years ago - present)
subjects Charge exchange
Computer simulation
Density distribution
Electric propulsion
Hall thruster
Hall thrusters
Laser absorption spectroscopy
Monte Carlo methods
Neutral particles
PIC–DSMC method
Plume shield
Plumes
title Charge exchange ion number density distribution in Hall thruster plume
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