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dc.contributor.authorSun, Yonghai 15:44:22 (GMT) 15:44:22 (GMT)
dc.description.abstractThe objective of this research is to build a prototype of a carbon nanotube (CNT)-based micro X-ray tube array, which can be used in a real-time cone-beam computed tomography (CT) scanner for cancer research. The X-ray tube array consists of an electron source, control grids, focusing electrodes, and an anode plate. All the experiments have been executed in an ultra high vacuum environment at a pressure of 10⁻⁷ Torr. A thin film consisting of multi-wall carbon nanotubes (MWNTs) was used as the electron source. A diode configuration was employed to test the field emission performance of the CNT thin film. The current density achieved was 1mA/cm² at 10V/µm. After the initial burn-in process, a relatively steady emission current was obtained for duration of 170 hours. The control grid was made of 25% opening space stainless steels mesh. Meshes with different wire diameters were tested in a triode structure, and some differences were observed. Multi-anode field emission tests and multi-tube electric field simulations were executed. Experiments and simulations have revealed crosstalk between pixels during field emission. Based on the above experiments and simulations, a signal pixel prototype has been fabricated and is being tested. Moreover, some potential optimizations that will be used in the second prototype are also discusseden
dc.publisherUniversity of Waterlooen
dc.subjectCarbon Nanotubeen
dc.subjectField Emissionen
dc.titleDesign of Carbon Nanotube Based Field Emission Facilityen
dc.typeMaster Thesisen
dc.subject.programSystem Design Engineeringen Design Engineeringen
uws-etd.degreeMaster of Applied Scienceen

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