Neutral density map of Hall thruster plume expansion in a vacuum chamber

Journal Article · Sun May 15 04:00:00 EDT 2005 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1915011· OSTI ID:20722207

Walker, Mitchell L.R.; Gallimore, Alec D ^[1]

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1. Department of Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)

A neutral background pressure map of the large vacuum test facility (LVTF) is presented. The LVTF is mapped at cold anode flow rates of 5.25, 10.46, and 14.09 mg/s. In addition, neutral background pressure maps are created at hot anode (i.e., discharge on) flow rates of 5.25 and 10.46 mg/s for discharge voltages of 300 and 500 V, corresponding to P5 Hall thruster operating conditions ranging from 1.5 to 5.0 kW. The chamber pressure is mapped at nominal xenon pumping speeds of 140,000 and 240,000 l/s. The pressure map is performed with a rake consisting of five calibrated Bayard-Alpert hot-cathode ionization gauges. The plume expansion appears to be independent of anode flow rate and facility background pressure. Analysis of axial pressure profiles on the LVTF's centerline shows that the plume pressure decreases from a maximum at the thruster exit plane down to the facility background pressure at approximately 2 m downstream of the exit plane. Comparison of axial pressure profiles on the LVTF's centerline shows that the neutral density is nearly the same for cold flow and hot flow. The study shows that a cold flow neutral density background map accurately characterizes the neutral density in an operating Hall thruster plume.

• OSTI ID: 20722207
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 5 Vol. 76; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANODES
CATHODES
COMPARATIVE EVALUATIONS
EXPANSION
FLOW RATE
IONIZATION
IONIZATION GAGES
MAGNETOHYDRODYNAMICS
MAPS
PLASMA
PLASMA DENSITY
PLASMA PRESSURE
TEST FACILITIES
THRUSTERS
XENON