A Study of Flat Ring Emitter Electron Guns (Part B)
| dc.contributor.advisor | Hutcheon, R. M. | |
| dc.contributor.author | Harvey, Stanley Brooks | |
| dc.contributor.department | Engineering Physics | en_US |
| dc.date.accessioned | 2015-09-09T19:40:14Z | |
| dc.date.available | 2015-09-09T19:40:14Z | |
| dc.date.issued | 1976-09 | |
| dc.description | This is Part B of the Thesis. | en_US |
| dc.description.abstract | <p> The design and performance of a flat emitting ring on-axis electron gun suitable for use in a small reflected beam accelerator was investigated. The design constraints include a low emittance (approximately 5π cm mrad), and a small beam size with a focus approximately 13 cm from the emitting surface.</p> <p> A suitable geometry was determined theoretically and was tested with a dispenser cathode. A beam with a focus at 12.7 ± 1 cm and an emittance of approximately 7π cm mrad was obtained. However, the dispenser cathode response time to heater current changes is too large for the required gun current control.</p> <p> Experiments were done to study the mechanical and thermal properties of flat emitting foil rings, since a directly heated foil has a fast response time. Two foils were tested: 1.27 x 10^-3 cm thick tungsten and 4.57 x 10^-4 cm thick tantalum. The present simple design requires impractically thin foils (≤ 0.25 microns thick) to reach emission temperatures at feasible heater currents.</p> | en_US |
| dc.description.degree | Master of Engineering (MEngr) | en_US |
| dc.description.degreetype | Thesis | en_US |
| dc.identifier.uri | http://hdl.handle.net/11375/18016 | |
| dc.language.iso | en_US | en_US |
| dc.subject | flat, ring, emitting, cathode, electron, currents, emission | en_US |
| dc.title | A Study of Flat Ring Emitter Electron Guns (Part B) | en_US |
| dc.type | Thesis | en_US |