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dc.contributor.authorDhar, Sauraven_US
dc.date.accessioned2013-10-30T08:00:19Z
dc.date.available2013-10-30T08:00:19Z
dc.date.issued2013-10-29en_US
dc.identifier.othervt_gsexam:1742en_US
dc.identifier.urihttp://hdl.handle.net/10919/23931
dc.description.abstractUnderstanding and improving ionospheric models is important for both military and civilian purposes. This understanding improves prediction of radio propagation used for communication and GPS navigation. Various space-borne instruments, such as retarding potential analyzers (RPAs) and ion traps are routinely flown in low earth orbit (LEO) to provide data for seeding/improve ionospheric models. This thesis describes and characterizes a new ion source that can be used to test and calibrate these space-borne instruments inside a laboratory vacuum chamber. Hot filaments are used to thermionically emit electrons inside the source. These electrons collisionally ionize neutral particles inside the source. Guided by ion-optics simulations, the ion and the electron trajectories inside the source are controlled to provide the required ion beams. A detailed description of the control electronics and the embedded controller for electron emission is discussed within. Using the custom made electronics, the source is able to provide an ion beam with current densities and mean energy comparable to the conditions in LEO.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectIon sourceen_US
dc.subjectIonosphereen_US
dc.subjectvacuum chamberen_US
dc.subjectLow Earth Orbiten_US
dc.titleIonospheric Simulator (IonSim) : Simulating Ionospheric conditions in a vacuum chamberen_US
dc.typeThesisen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical Engineeringen_US
dc.contributor.committeechairEarle, Gregory D.en_US
dc.contributor.committeememberBailey, Scott M.en_US
dc.contributor.committeememberBaumann, William T.en_US


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