(A) study of soft x-ray imaging for the estimation of electron temperature in plasma using micro-channel plate = 플라스마의 전자온도 평가를 위한 MCP를 이용한 소프트 엑스레이 영상화에 관한 연구

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Micro-channel plate (MCP) is a thin planar device which can detect UV and soft x-rays of the energy up to a few hundreds keV. Therefore it has been widely used in science research and industries, especially in plasma facilities, where UV and/or soft x-rays are often analyzed to diagnose the characteristics of the plasma. It has a relatively high quantum gain up to a million. An MCP is composed of a bundle of individual short glass tubes, through holes of which the primary electrons are multiplied, so the gain of individual channels may yields a significant non-uniformity between each channel, which again distorts the measured soft x-ray image. The x-ray spectra from the obtained MCP images are compared with a single channel silicon diode spectrometer, in order to the map out the gain non-uniformity. In the real plasma facilities, fine calibration of linearity and uniformity is often limited due to the integrated nature of MCP’s signal over all energy radiations and the integration time. In this study, we developed a soft x-ray spectroscopic imager using a pin hole collimator, changeable aluminium filters and an MCP of 28 mm diameter. Using this measurement system, we established the estimation process of x-ray fluence through the system calibration experiments. And if separate spectrometer is supplied, the estimation of electron temperature in plasma can be done. Surely the x-ray fluence data are meaningful things themselves to diagnose the state of plasma.
Advisors
Cho, Gyu-Seongresearcher조규성researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2003
Identifier
230903/325007  / 020013927
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2003.8, [ iv, 28 p. ]

Keywords

soft x-ray; Electron temperature; Micro-channel plate; plasma; 플라스마; 영상화; 전자온도; 미세채널증폭기

URI
http://hdl.handle.net/10203/49467
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=230903&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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