Semi-analytical model of ionization oscillations in Hall thrusters
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.
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| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2015
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| Online Access: | http://hdl.handle.net/1721.1/98810 |
| _version_ | 1826214221513228288 |
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| author | Mockelman, Jeffrey A. (Jeffrey Alan) |
| author2 | Manuel Martinez-Sanchez. |
| author_facet | Manuel Martinez-Sanchez. Mockelman, Jeffrey A. (Jeffrey Alan) |
| author_sort | Mockelman, Jeffrey A. (Jeffrey Alan) |
| collection | MIT |
| description | Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015. |
| first_indexed | 2024-09-23T16:02:02Z |
| format | Thesis |
| id | mit-1721.1/98810 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:02:02Z |
| publishDate | 2015 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/988102019-04-10T15:42:05Z Semi-analytical model of ionization oscillations in Hall thrusters Mockelman, Jeffrey A. (Jeffrey Alan) Manuel Martinez-Sanchez. Massachusetts Institute of Technology. Department of Aeronautics and Astronautics. Massachusetts Institute of Technology. Department of Aeronautics and Astronautics. Aeronautics and Astronautics. Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015. Cataloged from PDF version of thesis. Includes bibliographical references (pages 107-108). This thesis presents efforts to better understand the breathing-mode oscillation within Hall thrusters. These oscillations have been present and accepted within Hall thrusters for decades, but recent interest in the oscillation has occurred partly due to a possible connection between wall erosion and the oscillations. The first part of this thesis details a steady model of the ionization region in a Hall thruster that finds existence criteria for the steady solution under the hypothesis that the steady limits match the smooth sonic passage limits. Operation outside these limits would correspond to unsteady behavior which could result in either a periodic oscillatory behavior or plume extinguishment. To distinguish between periodic behavior and thruster extinguishment, an unsteady model of the ionization region is developed, but this model falls short of its goal. The transient model, however, is still useful for observation of the periodic nature of an oscillating Hall thruster. Next, an anode depletion model for Hall thrusters is formulated. This model explores one of the causes of thruster extinguishment, when the plasma cannot reach the anode. Finally, a new method for performing Boron Nitride erosion measurements is discussed and preliminary results are presented. This method imbeds Lithium ions into Boron Nitride. The depth of the Lithium can be measured before and after erosion or deposition to give a net erosion or accumulation measurement. by Jeffrey A. Mockelman. S.M. 2015-09-17T19:13:43Z 2015-09-17T19:13:43Z 2015 2015 Thesis http://hdl.handle.net/1721.1/98810 921147060 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 108 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Aeronautics and Astronautics. Mockelman, Jeffrey A. (Jeffrey Alan) Semi-analytical model of ionization oscillations in Hall thrusters |
| title | Semi-analytical model of ionization oscillations in Hall thrusters |
| title_full | Semi-analytical model of ionization oscillations in Hall thrusters |
| title_fullStr | Semi-analytical model of ionization oscillations in Hall thrusters |
| title_full_unstemmed | Semi-analytical model of ionization oscillations in Hall thrusters |
| title_short | Semi-analytical model of ionization oscillations in Hall thrusters |
| title_sort | semi analytical model of ionization oscillations in hall thrusters |
| topic | Aeronautics and Astronautics. |
| url | http://hdl.handle.net/1721.1/98810 |
| work_keys_str_mv | AT mockelmanjeffreyajeffreyalan semianalyticalmodelofionizationoscillationsinhallthrusters |