Development of laser-based technology for the routine first wall diagnostic on the tokamak EAST: LIBS and LIAS

Temporal and spatial study of differently charged ions emitted by ns-laser-produced tungsten plasmas using time-of-flight mass spectroscopy

“…In recent years, the LIBS technique has been developed to be an important remote, in situ monitoring diagnostic tool for investigating plasma-wall interaction (PWI) processes such as wall erosion, impurity deposition, impurity migration, and plasma fuel retention [22][23][24][25] in tokamaks. However, differently charged ions for the LIBS analysis have not received much attention, as reduced pressure or vacuum conditions are required for their observation.…”

“…Absolute quantitative analysis can be carried out, based on the re-emitted characteristic line intensity with absolute calibration and inverse photon efficiency. Therefore, it also has been proposed as a unique method for measuring the fuel retention and impurity migration during the tokamak discharge process [23]. Before the LIAS measurements in tokamaks, an assessment of the influence of differently charged ions is a critical process for obtaining reliable data for the absolute quantitative analysis.…”

Towards ps-LIBS tritium measurements in W/Al materials

“…Besides, the global monitoring of the machine requires this determination to correctly estimate the most appropriate time of aged PFCs decommissioning. The LIBS (Laser-Induced Breakdown Spectroscopy) diagnostic has been proposed to perform such estimates [3]. Under laser irradiation, the PFCs' wall undergoes a solid → plasma transition giving rise to the emission of lines whose spectroscopic analysis leads to the multi-elemental composition of the sample provided certain assumptions.…”

“…Under laser irradiation, the PFCs' wall undergoes a solid → plasma transition giving rise to the emission of lines whose spectroscopic analysis leads to the multi-elemental composition of the sample provided certain assumptions. Even if most of the LIBS measurements are performed using nanosecond laser pulses with a certain degree of success [3][4][5], we have chosen to investigate the potentialities of picosecond laser pulses already tested in JET [6]. Previous works have shown that LIBS using ns pulses is not necessarily the most appropriate to the measurement of the concentration of light atoms in heavy matrices.…”

From big to strong: growth of the Asian laser-induced breakdown spectroscopy community

“…Several groups including Tsinghua University [31][32][33][34][35][36][37][38], South China University of Technology [39][40][41][42], Shanxi University [43][44][45][46] and Mitsubishi Heavy [47,48] have made a great contribution on the coal property analysis; groups such as Shenyang Institute of Automation [49][50][51], Huazhong University of Science and Technology [52,53], and Tohoku University [54,55] also made significant progress on the online and in situ LIBS applications on the metallurgical industry. In terms of applications for the extreme environment detection, groups such as University of Tokyo [56][57][58][59] and Ocean University of China [60][61][62][63] have successfully employed the in situ analysis of deep-sea mineral samples using LIBS, and groups such as Dalian University of Technology [64][65][66][67] and Japan Atomic Energy Agency [68,69] have proved that LIBS is an effective tool for in situ elemental analysis for nuclear reactors. A new collinear DP-LIBS method has been proposed by Tokushima University and Xi'an Jiaotong University.…”