Laser-induced fluorescence study of a xenon Hall thruster |
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Authors: | RJ Cedolin WA Hargus Jr PV Storm RK Hanson MA Cappelli |
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Institution: | (1) Thermosciences Division, Department of Mechanical Engineering, Stanford University, Stanford, CA 94305-3032, USA (rcedolin@navier.stanford.edu; cap@leland.stanford.edu), US |
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Abstract: | 2
0→6p3/2]2(3P2-1D2) transition at 823.2 nm and the xenon-ion 5d3]7/2→6p2]5/2
0(4D7/2-4P5/2) transition is used to measure plasma parameters in the plume of a laboratory-model xenon Hall thruster. The Hall discharge
operates nominally at 62 V, 4.2 A, and 3.2 mg s-1 xenon flow, with an overall thruster power of 320 W. A tunable semiconductor diode laser and an Ar+-pumped dye laser are used to probe the respective excited-state transitions. Axial velocity measurements are made at a number
of axial and radial locations up to 4.5 cm downstream of the thruster-exit plane and under a variety of thruster operating
conditions. Neutral velocities from 100 m s-1 to 400 m s-1 and ion velocities as high as 12 km s-1 are calculated from measured Doppler shifts. The charge-exchange phenomenon evidently does not significantly affect the xenon
neutrals. The spectral-line shapes of the ion indicate a spread in ion energies through a non-Maxwellian distribution of axial
velocities. Neutral kinetic temperatures of 500 (±200) K are observed under standard operating conditions. Zeeman and Stark
effects on the spectral-line shapes, from the thruster’s magnetic and electric fields, are not substantial. The measured line
center of the ion transition is 16521.23 (±0.02) cm-1.
Received: 20 January 1997/Revised version: 12 May 1997 |
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Keywords: | PACS: 52 70 Kz 32 70 Jz 52 75 -d |
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