Simulation and modeling of alignment-free field emission X-ray tubes

被引：3

作者：

Youh, Meng-Jey ^{[1
]}

Chou, Yi-Ping ^{[2
]}

Liu, Yih-Ming ^{[3
]}

Ger, Ming-Der ^{[3
]}

Hou, Kung-Hsu ^{[4
]}

Pu, Nen-Wen ^{[5
]}

机构：

[1] Hsing Wu Univ, Dept Informat Technol, New Taipei 244, Taiwan

[2] Natl Def Univ, Chung Cheng Inst Technol, Sch Def Sci, Taoyuan 335, Taiwan

[3] Natl Def Univ, Chung Cheng Inst Technol, Dept Chem & Mat Engn, Taoyuan 335, Taiwan

[4] Natl Def Univ, Chung Cheng Inst Technol, Dept Power Vehicle & Syst Engn, Taoyuan 335, Taiwan

[5] Yuan Ze Univ, Dept Photon Engn, Taoyuan 320, Taiwan

来源：

APPLIED MATHEMATICAL MODELLING | 2015年 / 39卷 / 19期

关键词：

X-ray tube; Field emission; Alignment-free; Carbon nanocoil; CHEMICAL-VAPOR-DEPOSITION; CARBON NANOTUBE FILMS; CATALYTIC PYROLYSIS; ELECTRON SOURCE; LIGHT-SOURCE; GROWTH; ACETYLENE; LAMP; NANOFIBERS; MORPHOLOGY;

D O I：

10.1016/j.apm.2015.03.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new hemispherical-geometry cathode for field emission (FE) X-ray tubes was designed and simulated in this study. The electric field strength distribution on the hemispherical-geometry cathode was calculated and used to predict the emission current. Because of their unique FE properties, carbon nanocoils were used as the electron emitters for simulation and modeling. The results show that a large tolerance is permitted, and the performance attained with 20 cathode misalignment was nearly identical to that without misalignment. The maximum emission current can be achieved using a hemispherical-geometry cathode with a radius of 1 mm. Additional advantages of FE X-ray tubes with hemispherical-geometry cathodes are higher FE currents, shorter response times, and smaller X-ray spot sizes. In addition, lower power consumption, longer lifetimes, and higher resolutions are expected with this simple and low-cost design. (C) 2015 Elsevier Inc. All rights reserved.

引用

页码：5896 / 5906

页数：11

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