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Study on a High Beam Transparency Gridded X-ray Electron Gun Based on Carbon Nanotube Cold Cathode

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Based on experimental results of a conventional gridded triode with a planar carbon nanotube (CNT) cold-cathode, a square column array field emission cathode topology is proposed to improve the beam transparency and cathode surface electric field distribution. Optimized parameters of a gridded diode are obtained by investigating the electric field at surface of CNT array cathode. Compared with a planar anode diode the electric field at the cathode surface is almost uniformity and increased some 50%. Furthermore, a gridded X-ray electron gun based on the mentioned CNT cathode substrate has been geometrically optimized by particle in cell (PIC) software. Simulation results show that a 40 kV/4.03 mA electron beam can be achieved with a beam transparency of 99% and the radius of beam spot is 0.1 mm.
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Keywords: BEAM TRANSPARENCY; CARBON NANOTUBE (CNT); COLD CATHODE; ELECTRON GUN; FIELD EMISSION; X-RAY

Document Type: Research Article

Publication date: September 1, 2018

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  • Journal of Nanoelectronics and Optoelectronics (JNO) is an international and cross-disciplinary peer reviewed journal to consolidate emerging experimental and theoretical research activities in the areas of nanoscale electronic and optoelectronic materials and devices into a single and unique reference source. JNO aims to facilitate the dissemination of interdisciplinary research results in the inter-related and converging fields of nanoelectronics and optoelectronics.
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