KSTAR의 주 이온 온도와 토로이달 속도 측정을 위한 그리즘 광학계의 응용연구
Application of Grism optics for the measurement of main ion temperature and toroidal velocity in KSTAR
- 주제(키워드) 핵융합 , CES
- 발행기관 아주대학교
- 지도교수 박지용
- 발행년도 2017
- 학위수여년월 2017. 2
- 학위명 석사
- 학과 및 전공 일반대학원 에너지시스템학과
- 실제URI http://www.dcollection.net/handler/ajou/000000024512
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
In 2015 KSTAR experimental campaign, the main ion spectral lines have been investigated under the framework of the development of main ion CES system. We were exposed to difficulties relating bright emission originating from plasma edge neutrals in KSTAR and handling overlapped complex spectra. We coped with the intense signals around Dα requiring extremely high dynamic range measurements by a genuine grism spectrometer system. At the exit of the spectrometer, the light is horizontally dispersed in wavelength. A vertical polarizing filter on the exit focal plane blocks the portion of the rest Dα spectrum. This blocked spectrum image, then, was focused onto the plane of CCD via a relay lens. Modulation of the neutral beam injection and time slice subtraction is used to eliminate the complicating features of complex spectral lines. The measured active charge-exchange signal can be fitted with two-Gaussian functions by means of a nonlinear least-squares fitting. We recognized preferentially information of shot number # 13103 in KSTAR plasma at 5.985 s such as plasma current (605 kA), plasma stored energy (186 kJ), and line averaged density (12.2ⅹ1019 m-3). From the fitted Gaussian function, the ion temperature and toroidal rotation velocity in the core plasma (r = 1,880 mm) are estimated to be 1.828 keV and 260.05 km/s.
more목차
I. Introduction
II. Theory
2.1. Charge Exchange Spectroscopy
2.1.1. Introduction
2.1.2. Principle
2.2. Doppler Broadening and Doppler Shift
III. Experiment
3.1. Introduction
3.2. Previous optical system
3.3. Optical system in 2015 KSTAR Campaign
3.4 Measurement of main ion in 2015 KSTAR Campaign
IV. Date Analysis
4.1. Subtraction background spectrum
4.2. Fitting using Matlab
V. Result and Discussion
5.1. Preliminary information on KSTAR plasma from C VI CES
5.2. Comparison of CES Data in Main ion and C VI
5.3. Discussion
VI. Conclusion
VII. Reference
