Laser-induced fluorescence measurements of velocity within a Hall discharge |
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Authors: | WA Hargus Jr MA Cappelli |
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Institution: | (1) Mechanical Engineering Department, Thermosciences Division, Stanford University, Stanford, CA 94305, USA, US |
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Abstract: | The results of a study of laser-induced fluorescence velocimetry of neutral and singly ionized xenon in the plume and interior
portions of the acceleration channel of a Hall thruster plasma discharge operating at powers ranging from 250 to 725 W are
described. Axial ion and neutral velocity profiles for four discharge voltage conditions (100 V, 160 V, 200 V, 250 V) are
measured as are radial ion velocity profiles in the near-field plume. Ion velocity measurements of axial velocity both inside
and outside the thruster as well as radial velocity measurements outside the thruster are performed using laser-induced fluorescence
with nonresonant signal detection on the xenon ion 5d4]7/2–6p3]5/2 excitation transition while monitoring the signal from the 6s2]3/2–6p3]5/2transition. Neutral axial velocity measurements are similarly performed in the interior of the Hall thruster using the 6s3/2]0
2–6p3/2]2transition with resonance fluorescence collection. Optical access to the interior of the Hall thruster is provided by a 1-mm-wide
axial slot in the insulator outer wall. While the majority of the ion velocity measurements used partially saturated fluorescence
to improve the signal-to-noise ratio, one radial trace of the ion transition was taken in the linear fluorescence region and
yields a xenon ion translational temperature between 400 and 800 K at a location 13 mm into the plume.
Received: 27 September 2000 / Revised version: 2 March 2001 / Published online: 9 May 2001 |
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Keywords: | PACS: 52 70 Kz 52 75 Di 52 80 Vp |
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