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Spatially Mapping the Ion Energy Distributions in Hollow Cathode Discharges

Przybylowski, JoHanna N. and Polk, James E. and Shepherd, Joseph E. (2008) Spatially Mapping the Ion Energy Distributions in Hollow Cathode Discharges. In: 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. American Institute of Aeronautics and Astronautics , Reston, VA, Art. No. 2008-5206. ISBN 978-1-60086-992-1. https://resolver.caltech.edu/CaltechAUTHORS:20200324-075425413

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Abstract

Distributions of ion energy-per-charge were collected with an electrostatic energy analyzer directed along various lines-of-sight in the near-plume region of a hollow cathode operating in a laboratory discharge chamber. While the analyzer was stationary, the cathode and anode assembly were mounted on a rotary and a linear stage, allowing measurements along the cathode axis and at off-axis angles up to 90°; the linear stage enabled translational motion which allowed for measurements parallel to the cathode axis. At angles below 45°, three distinct ion populations were identified: two low-energy narrow peaks and a broad high-energy “tail” with energies-per-charge in excess of 5 times the discharge voltage. Detection of low-energy ions above 45° was not possible since they were confined by the anode voltage. At large angles, the intensity of the high-energy ion signal decreased to become indistinguishable from noise in the data system; however, based on previous results, the failure to detect high-energy ions at large angles has been attributed to the large distance between the ESA line-of-sight and the cathode axis increased from 0° to 16°, the location of the low-energy ion peaks shift but there is no apparent difference in the high-energy ion tail. Increasing the separation angle further yields a decrease in intensity at all energies. For low energies-per-charge, the shape and intensity of the unidirectional ion-energy distribution does not change when the cathode is translated up to 2.5cm; however, as the distance from the cathode centerline increases, the signal intensity of the high-energy ions decreases in a manner similar to the decrease in high-energy ions seen with increasing angles above 30°. These results indicate that magneto-gas dynamic forced did not accelerate the ions observed in this experiment; additional experiments will elucidate the mass and energy dependence of the mechanisms responsible for high-energy ions.


Item Type:Book Section
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https://doi.org/10.2514/6.2008-5206DOIArticle
ORCID:
AuthorORCID
Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:© 2008 by the American Institute of Aeronautics and Astronautics, Inc. The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Governmental purposes. All other rights are reserved by the copyright owner.
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AIAA Paper2008-5206
Record Number:CaltechAUTHORS:20200324-075425413
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200324-075425413
Official Citation:Spatially Mapping the Ion Energy Distributions in Hollow Cathode Discharges. JoHanna Przybylowski, James Polk, and Joseph Shepherd. 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. July 20058; doi: /10.2514/6.2008-5206
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102072
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Mar 2020 15:34
Last Modified:24 Mar 2020 15:34

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