Explosive emission cathodes for high power microwave devices: gas evolution studies

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dc.contributor.advisorUmstattd, R.J.
dc.contributor.authorSchlise, Charles A.
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.contributor.departmentPhysics
dc.contributor.secondreaderBook, D.L.
dc.dateJune 2004
dc.date.accessioned2012-03-14T17:31:59Z
dc.date.available2012-03-14T17:31:59Z
dc.date.issued2004-06
dc.description.abstractPresent-day high power microwave devices suffer from a lack of reliable, reproducible cathodes for generating the requisite GW-level electron beam in a vacuum. Standard explosive emission cathode pulse durations have been limited to 10's or 100's of ns due to the expansion of cathode-generated plasma and the ensuing impedance collapse that debilitates microwave output. Traditional thermionic cathodes do not suffer from this drawback of plasma generation, but have not yet been able to provide the required emission current densities explosive emission cathodes are capable of. It is expected that if the plasma could be made cooler and less dense, explosive emission would be more stable. Cesium iodide (CsI) has been found to slow the impedance collapse in many explosive emission cathodes. Herein we will experimentally examine diode impedance collapse, gas production, and cathode conditioning in an effort to perform an evaluation of explosive cathode performance in a typical thermionic electron gun environment. These results will then be used to help demarcate the parameter space over which these CsI-coated carbon fiber cathodes are viable candidates for the electron beam source in next-generation high power microwave devices.en_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.
dc.description.serviceLieutenant, United States Navyen_US
dc.description.urihttp://archive.org/details/explosiveemissio109451470
dc.format.extentxii, 43 p. : ill. (chiefly col.)en_US
dc.identifier.urihttps://hdl.handle.net/10945/1470
dc.publisherMonterey, CA; Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.subject.authorHigh power microwavesen_US
dc.subject.authorCathodesen_US
dc.subject.authorElectron beamen_US
dc.subject.authorVacuumen_US
dc.subject.authorExplosive emissionen_US
dc.subject.authorPlasmaen_US
dc.subject.authorCarbon fiberen_US
dc.subject.lcshMicrowavesen_US
dc.subject.lcshMilitary applicationsen_US
dc.subject.lcshCathodesen_US
dc.subject.lcshElectron beamsen_US
dc.titleExplosive emission cathodes for high power microwave devices: gas evolution studiesen_US
dc.typeThesisen_US
dspace.entity.typePublication
etd.thesisdegree.disciplineApplied Physicsen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.nameM.S. in Applied Physicsen_US
etd.verifiednoen_US
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