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Please use this identifier to cite or link to this item:
http://hdl.handle.net/1903/1889
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| Title: | EXPERIMENTAL STUDY OF LONGITUDINAL ENERGY SPREAD IN SPACE-CHARGE- DOMINATED BEAMS |
| Authors: | Cui, Yupeng |
| Advisors: | O'Shea, Patrick |
| 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)
Energy Spread, Energy Analyzer |
| Issue Date: | 9-Sep-2004 |
| Abstract: | A compact high-resolution variable-focusing retarding field energy analyzer has been developed to measure the energy spread of space-charge-dominated electron beams. A cylindrical focusing electrode is used to overcome the beam expansion inside the device due to space-charge forces, beam emittance, etc. The focusing voltage is independently adjustable to provide proper focusing strength. Single particle simulation and theoretical error analysis using beam envelopes show that this energy analyzer can get very high resolution for low-energy beams, which was found to be in good agreement with experimental results. The measured beam energy spectrum is both temporally and spatially resolved. In addition, a computer-controlled automatic system is developed to provide real-time data acquisition and processing. The measurements of the beam energy spread are compared with the theoretical predictions.
It is believed that coupling between the transverse and longitudinal directions via Coulomb c... |
| URI: | http://hdl.handle.net/1903/1889 |
| 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-1863.pdf | | 1822Kb | Adobe PDF | 227 | View/Open |
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