Preliminary results of in situ laser-induced breakdown spectroscopy for the first wall diagnostics on EAST
Post-mortem methods cannot fulfill the requirement of monitoring the lifetime of the plasma facing components （PFC） and measuring the tritium inventory for the safety evaluation. Laserinduced breakdown spectroscopy （LIBS） is proposed as a promising method for the in situ study of fuel retention and...
Saved in:
| Published in | Plasma science & technology Vol. 19; no. 2; pp. 56 - 62 |
|---|---|
| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.02.2017
|
| Online Access | Get full text |
| ISSN | 1009-0630 |
| DOI | 10.1088/2058-6272/19/2/025502 |
Cover
| Summary: | Post-mortem methods cannot fulfill the requirement of monitoring the lifetime of the plasma facing components （PFC） and measuring the tritium inventory for the safety evaluation. Laserinduced breakdown spectroscopy （LIBS） is proposed as a promising method for the in situ study of fuel retention and impurity deposition in a tokamak. In this study, an in situ LIBS system was successfully established on EAST to investigate fuel retention and impurity deposition on the first wall without the need of removal tiles between plasma discharges. Spectral lines of D, H and impurities （Mo, Li, Si ） in laser-induced plasma were observed and identified within the wavelength range of 500-700 nm. Qualitative measurements such as thickness of the deposition layers, element depth profile and fuel retention on the wall are obtained by means of in situ LIBS. The results demonstrated the potential applications of LIBS for in situ characterization of fuel retention and co-deposition on the first wall of EAST. |
|---|---|
| Bibliography: | tokamak, laser-induced breakdown spectroscopy, impurity deposition, fuel retention,plasma wall interaction Post-mortem methods cannot fulfill the requirement of monitoring the lifetime of the plasma facing components （PFC） and measuring the tritium inventory for the safety evaluation. Laserinduced breakdown spectroscopy （LIBS） is proposed as a promising method for the in situ study of fuel retention and impurity deposition in a tokamak. In this study, an in situ LIBS system was successfully established on EAST to investigate fuel retention and impurity deposition on the first wall without the need of removal tiles between plasma discharges. Spectral lines of D, H and impurities （Mo, Li, Si ） in laser-induced plasma were observed and identified within the wavelength range of 500-700 nm. Qualitative measurements such as thickness of the deposition layers, element depth profile and fuel retention on the wall are obtained by means of in situ LIBS. The results demonstrated the potential applications of LIBS for in situ characterization of fuel retention and co-deposition on the first wall of EAST. Zhenhua HU 1, Cong LI 2, Qingmei XIAO 2, Ping LIU 2, Fang DING 1, Hongmin MAO 4, Jing WU 1, Dongye ZHAO 2, Hongbin DING 2, Guang-Nan LUO1and EAST team（1 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People＇s Republic of China 2 Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Chinese Ministry of Education, School of Physics and Optical Electronic Technology, Dalian University of Technology, Dalian 116024, People＇ s Republic of China） 34-1187/TL |
| ISSN: | 1009-0630 |
| DOI: | 10.1088/2058-6272/19/2/025502 |