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    Magnetic Field Effects on the Plume of a Diverging Cusped-Field Thruster

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    Type
    Conference Paper
    Authors
    Matlock, Taylor
    Gildea, Stephen
    Hu, Fuzhou
    Becker, Nicholas Michael
    Lozano, Paulo
    Martinez-Sanchez, Manuel
    KAUST Department
    Electrical Engineering Program
    Date
    2012-11-15
    Online Publication Date
    2012-11-15
    Print Publication Date
    2010-07-25
    Permanent link to this record
    http://hdl.handle.net/10754/594719
    
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    Abstract
    The Diverging Cusped-Field Thruster (DCFT) uses three permanent ring magnets of alternating polarity to create a unique magnetic topology intended to reduce plasma losses to the discharge chamber surfaces. The magnetic field strength within the DCFT discharge chamber (up to 4 kG on axis) is much higher than in thrusters of similar geometry, which is believed to be a driving factor in the high measured anode efficiencies. The field strength in the near plume region is large as well, which may bear on the high beam divergences measured, with peaks in ion current found at angles of around 30-35 from the thruster axis. Characterization of the DCFT has heretofore involved only one magnetic topology. It is then the purpose of this study to investigate changes to the near-field plume caused by altering the shape and strength of the magnetic field. A thick magnetic collar, encircling the thruster body, is used to lower the field strength outside of the discharge chamber and thus lessen any effects caused by the external field. Changes in the thruster plume with field topology are monitored by the use of normal Langmuir and emissive probes interrogating the near-field plasma. Results are related to other observations that suggest a unified conceptual framework for the important near-exit region of the thruster.
    Publisher
    American Institute of Aeronautics and Astronautics (AIAA)
    Journal
    46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
    Conference/Event name
    46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit
    DOI
    10.2514/6.2010-7104
    Additional Links
    http://arc.aiaa.org/doi/abs/10.2514/6.2010-7104
    ae974a485f413a2113503eed53cd6c53
    10.2514/6.2010-7104
    Scopus Count
    Collections
    Conference Papers; Electrical Engineering Program

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