Accession Number : ADA255172


Title :   Design and Evaluation of Ion Source for Satellite Charge Control


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Melvin, Michael E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255172.pdf


Report Date : Jun 1992


Pagination or Media Count : 117


Abstract : This thesis describes the design of a new spacecraft charge control device that incorporates a solid ion source made of Lithium or Potassium salt impregnated into a porous tungsten plug. The ion source was configured with a reentrant thin-wall heat shield to reduce heat loss and an experimental thermocouple imbedded in the plug to accurately measure emission temperature. The initial design of the charge control device included an extraction grid, deceleration grid, and an electron filament source. Experiments were conducted on the charge control device and results were used to modify the design for optimization of current out of the device versus power used. Incremental testing and modifications resulted in the deceleration grid being removed and the extraction plate's wire mesh being removed to allow a clear path for the ions. With these changes the requirement of 10 microamps was achieved at 13 watts with the Potassium ion source.


Descriptors :   *TEST AND EVALUATION , *LITHIUM , *ARTIFICIAL SATELLITES , *SPACECRAFT CHARGING , *ION SOURCES , *POTASSIUM , CONTROL , REQUIREMENTS , EMISSION , IONS , TEMPERATURE , OPTIMIZATION , ELECTRONS , THERMOCOUPLES , PLUGS , HEAT , SALTS , POWER , HEAT SHIELDS , FILAMENTS , EXTRACTION , WALLS , THIN WALLS , HEAT LOSS , DECELERATION , TUNGSTEN , SPACECRAFT , MODIFICATION , GRIDS , PATHS , THESES , SOLIDS , MESH


Subject Categories : Physical Chemistry
      Unmanned Spacecraft
      Manned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE