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Please use this identifier to cite or link to this item:
http://hdl.handle.net/1903/3839
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| Title: | Fabrication and Measurement of Regenerable Low Workfunction Photocathodes |
| Authors: | Moody, Nathan Andrew |
| Advisors: | O'Shea, Patrick G. |
| Department/Program: | Electrical Engineering |
| Type: | Dissertation |
| Sponsors: | Digital Repository at the University of Maryland
University of Maryland (College Park, Md.) |
| Keywords: | Engineering, Electronics and Electrical (0544)
Physics, Elementary Particles and High Energy (0798)
Physics, Condensed Matter (0611)
photocathode; quantum efficiency; photoinjector; dispenser cathode; cathode lifetime; cesium |
| Issue Date: | 3-Aug-2006 |
| Abstract: | Laser-switched photoemitters are a source of electrons for high current applications such as free electron lasers. Laser-modulated photoemission permits rapid switching of the electron beam, far surpassing what can be achieved using electric-field gated emission. Photoinjector systems consist of a drive laser producing short bunches of photons and an efficient photocathode, which converts photon bunches into electron beam pulses. Development of both technologies is required, but the scope of this project is restricted to improvement of the photocathode. Most high-efficiency photocathodes employ cesium-based surface coatings to reduce work function and enable efficient electron emission in the visible range. Lifetime is severely limited by the loss of this delicate coating, which degrades rapidly in practical vacuum environments. More robust photocathodes exist, but have much lower efficiency, and place unrealistic demands on drive laser power and stability. This research proposes a nov... |
| URI: | http://hdl.handle.net/1903/3839 |
| Appears in Collections: | Electrical & Computer Engineering Theses and Dissertations
UM Theses and Dissertations
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Size | Format | No. of Downloads |
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| umi-umd-3684.pdf | | 8663Kb | Adobe PDF | 551 | View/Open |
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