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dc.contributor.advisorSwent, Richard L.
dc.contributor.advisorHarris, John R.
dc.contributor.authorKara, Abdullah
dc.dateJun-13
dc.date.accessioned2013-08-01T16:51:41Z
dc.date.available2013-08-01T16:51:41Z
dc.date.issued2013-06
dc.identifier.urihttp://hdl.handle.net/10945/34684
dc.descriptionApproved for public release; distribution is unlimiteden_US
dc.description.abstractPhotocathodes, in which light is used to extract electrons from materials by the photoelectric effect, are the principal electron sources for many linear accelerators and Free Electron Lasers (FELs). There is an increasing interest in the use of superconducting radiofrequency electron guns, which work at cryogenic temperatures, and therefore require photocathodes that work at cryogenic temperatures as well. The primary metric used to quantify photocathode performance is the cathodes Quantum Efficiency (QE), which is the ratio between the number of incoming laser photons and outgoing electrons. The objective of this thesis is to measure the QE of metal photocathodes as a function of temperature. To accomplish this, a photocathode test stand capable of varying the temperature of metal samples from 80 K to 400 K was developed, and copper and niobium samples were tested using it. The QE of copper was found to vary by a factor of more than four over this temperature range, while the QE of niobium showed only slight temperature dependence.en_US
dc.description.urihttp://archive.org/details/quantumefficienc1094534684
dc.publisherMonterey, California: 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. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.titleQuantum efficiency as a function of temperature in metal photocathodesen_US
dc.contributor.departmentPhysics
dc.subject.authorPhotocathodesen_US
dc.subject.authorNiobiumen_US
dc.subject.authorCryogenic Temperatureen_US
dc.subject.authorQuantum Efficiency.en_US
dc.description.serviceLieutenant Junior Grade, Turkish Navyen_US
etd.thesisdegree.nameMaster of Scienceen_US
etd.thesisdegree.nameMaster of Science in Applied Physicsen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineApplied Physicsen_US


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