Measurement of temperature and rotational velocity of main ion in KSTAR by Charge Exchange Spectroscopy
Measurement of temperature and rotational velocity of main ion in KSTAR by Charge Exchange Spectroscopy
- 주제(키워드) KSTAR , main ion , Charge Exchange Spectroscopy
- 발행기관 아주대학교
- 지도교수 박지용
- 발행년도 2014
- 학위수여년월 2014. 2
- 학위명 석사
- 학과 및 전공 일반대학원 에너지시스템학과
- 파일정보 pdf
- 실제URI http://www.dcollection.net/handler/ajou/000000016476
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
For the study of plasma physics, the measurement of the ion temperature and plasma rotation velocity profiles are of fundamental importance in controlled fusion research, several diagnostics have been developed to measure this quantity. Among them, The Charge Exchange Spectroscopy(CES) has been used as a diagnostic tool for measuring the concentrations of impurity ions and studying impurity behaviors in fusion plasma. In general, The CES is applied to investigate spectral lines emanated from light impurities such as C, He, Ne, Be, etc. Although measurement of the properties of the main ion species (H or D) is of primary importance in fusion plasma, spectral lines from impurity have been preferred due to the complexities and difficulties on the analysis of the spectral lines from main ions. Practically, main ion temperature is assumed to be same with impurity temperature when the collision frequency between main ions and impurities with help enough but rotation velocity of main ion is expected to be the dissimilar with impurity rotation velocity. In addition, measurement of impurity has restrictions depending on what is the material of the Tokamak. Consequentially, direct measurement of main ion properties is still demanded since these approaches cannot be validated in some cases. In 2012, 2013 KSTAR experimental campaign, the main ion spectral lines has been investigated under the framework of the development of main ion CES system. Also, in order to overcome difficulties in analyzing spectral information around deuterium and hydrogen lines at 656.1 nm and 656.3 nm from the main ions of high temperature plasma in KSTAR, a two-grating spectrometer system is built using two concave mirrors. The spectral resolution is achieved up to 0.03Å. Simulation work for predicting charge exchange spectral lines for hydrogen and deuterium in some cases has been don for assessing the requirement for the spectrometer for main ion CES. The measured active charge-exchange signal can be fitted with two-Gaussian functions by means of a nonlinear least-squares fitting.
more목차
I. Introduction
1.1. Why fusion energy?
1.2. KSTAR (Korea Superconducting Tokamak Advanced Research)
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. Simulation of predict spectrum using Matlab
3.3. Optics
3.3.1. Configuration of optical component in KSTAR
3.3.2. Two-grating Spectrometer
3.4 Measurement
3.4.1. Measurement of main ion in 2013 KSTAR Campaign
IV. Analysis process for CES of the main ion in 2013 KSTAR
4.1. Subtraction background spectrum process
4.2. Nonlinear least squares fitting using Matlab
V. Result and discussion 37
5.1. Advance information of KSTAR plasma from C VI CES
5.2. Measurement of main ion temperature and rotation velocity in KSTAR
5.3. Discussion
VI. Summary and Future Works
VII. Reference
