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dc.contributor.advisorOlsen, Richard C.
dc.contributor.authorRyu, Chong Soo
dc.dateDecember 1990
dc.date.accessioned2013-02-15T23:11:07Z
dc.date.available2013-02-15T23:11:07Z
dc.date.issued1990-12
dc.identifier.urihttp://hdl.handle.net/10945/27660
dc.description.abstractA lithium ion source using thermal emission from a Beta-eucryptite structure has been investigated as a possible control device for spacecraft charging. This source can be used for control of positively charged spacecraft potentials in sunlight and differentially charged spacecraft surfaces in shadow. This thesis investigates the emission characteristics of lithium ion sources in conjunction with two kinds of electron sources and simulates spacecraft charge control. A 0.6-in. lithium ion source produced currents up to 33 micro Amps at a bias voltage of 100 V on the surface (strips) of the simulation body with extraction potentials of 200 V to the screen. Differential charging simulations produced currents up to 21 micro Amps on the rear strip of the simulation structure at a bias voltage of 250 V. A directly heated tungsten dispenser cathode and filament-type electron source were used to overcome space charge limiting effects. Space charge effects were studied with a 0.25-in. lithium ion source in conjunction with the tungsten dispenser cathode. The average increase in current was approximately 50%. Larger increases were found with the 0.6 in. lithium ion source, using the filament electron source. The greatest effects occurred for low extraction voltages (some what 20V). A typical increase was 400 % at 10 V. The vacuum chamber system and geometries for the simulation and investigation were very simple. However, the combined ion and electron sources could be used as a device for controlling a spacecraft potential in geosynchronous orbit.en_US
dc.description.urihttp://archive.org/details/satellitechargec1094527660
dc.format.extentx, 96 p. ill.en_US
dc.languageen_US
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsCopyright reserved by the copyright owneren_US
dc.subject.lcshPhysicsen_US
dc.subject.lcshLithiumen_US
dc.subject.lcshSpace vehiclesen_US
dc.subject.lcshElectrostatic charging.en_US
dc.titleSatellite charge control with lithium ion source and electron emissionen_US
dc.typeThesisen_US
dc.contributor.secondreaderHeinz, Otto
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentDepartment of Physics
dc.subject.authorSatellite charge controlen_US
dc.subject.authorlithium ion sourceen_US
dc.subject.authorelectron sourceen_US
dc.description.serviceCaptain, Republic of Korea Armyen_US
etd.thesisdegree.nameM.S. in Physicsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplinePhysicsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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