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Appl. Sci. 2015, 5(4), 942-954; doi:10.3390/app5040942

Fabrication and Simulation of Self-Focusing Field Emission X-ray Tubes

1
School of Defense Science, Chung Cheng Institute of Technology, National Defense University, Dasi, Taoyuan 335, Taiwan
2
Department of Information Technology, Hsing Wu University, New Taipei City 244, Taiwan
3
Department of Chemical and Materials Engineering, Chung Cheng Institute of Technology, National Defense University, Dasi, Taoyuan 335, Taiwan
4
Department of Power Vehicle and Systems Engineering, Chung Cheng Institute of Technology, National Defense University, Dasi, Taoyuan 335, Taiwan
5
Department of Photonics Engineering, Yuan Ze University, Chung-Li, Taoyuan 320, Taiwan
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Wen-Hsiang Hsieh
Received: 27 July 2015 / Revised: 27 September 2015 / Accepted: 20 October 2015 / Published: 26 October 2015
View Full-Text   |   Download PDF [2374 KB, uploaded 26 October 2015]   |  

Abstract

A self-focusing field emission (FE) X-ray tube with a large-area cathode design was simulated and fabricated. The designed X-ray tube had a cylindrically symmetric geometry; the diameter of the cathode and the anode was 15 mm, and the cathode-anode distance was 20 mm. Owing to the unique cup-shaped design of the cathode, the electron beam emitted from the large-area cathode was focused onto the anode without using magnetic lenses or extra biased electrodes. Carbon nanocoils, which were grown on the bottom of the circular cup-shaped cathode, were used as electron emitters because of their excellent FE properties. A simulation of the electron trajectories for various cup heights revealed that the optimal focal spot size (0.1 mm) was obtained at a cup height of 5 mm when a voltage of 50 kV was applied. To verify this result, an X-ray tube was fabricated and tested. An X-ray photograph of the tested tooth and electric circuits showed good resolution and X-ray intensity. The large cathode area effectively reduces the current density and thereby improves the lifetime of the cathode. View Full-Text
Keywords: X-ray tubes; field emission; carbon nanocoils X-ray tubes; field emission; carbon nanocoils
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cheng, K.; Chou, Y.-P.; Youh, M.-J.; Liu, Y.-M.; Ger, M.-D.; Hou, K.-H.; Pu, N.-W. Fabrication and Simulation of Self-Focusing Field Emission X-ray Tubes. Appl. Sci. 2015, 5, 942-954.

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