Design of X-ray targets for high-brightness microfocus X-ray tube = 고휘도 마이크로포커스 엑스선관을 위한 엑스선 타겟 설계

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A detailed study of the designing of an X-ray target is enclosed with an emphasis on maximizing the brightness of X-rays produced. The research is aimed at the minimization of the focal spot size by virtue of the geometric parameters of the transmission-type targets. Two different configurations of the transmission-type target have been considered. X-ray emissions from these targets were studied in detail using Monte-Carlo simulation code MCNP5. In the first part, parameters of a laminated configuration of transmission-type target have been optimized for a microfocus X-ray tube to produce high brightness of X-rays for a broad range of electron energies from 30 keV to 150 keV. In the second part, a novel concept is put forth to develop a microfocus X-ray tube based on a microstructured X-ray target that is irradiated with a nonfocused electron beam. The calculations revealed that the microstructured targets are quite capable of minimizing the effective X-ray spot sizes compared with those having a laminated configuration. Based on the simulation results of X-ray brightness, optimum geometric parameters were derived for the microstructured targets with different morphologies. The combination of the micro-structured targets and nonfocused electron beam allows the miniaturization of a microfocus X-ray tube by eliminating the needs for massive and complex focusing devices. Moreover, limitations of the maximum allowable electron beam currents for the stable operation of the X-ray targets are presented.
Cho, Sung-Ohresearcher조성오researcher
한국과학기술원 : 원자력및양자공학과,
Issue Date
418699/325007  / 020054535

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2010.2, [ xi, 82 p. ]


x-ray target; microfocus; x-ray tube; transmission target; 투과용 타겟; 엑스선 타겟; 마이크로포커스; 엑스선 튜브

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