Hits:

Indexed by:期刊论文

Date of Publication:2014-04-01

Journal:JOURNAL OF NUCLEAR MATERIALS

Included Journals:SCIE、EI、Scopus

Volume:447

Issue:1-3

Page Number:9-14

ISSN No.:0022-3115

Abstract:Our recent investigations have indicated that dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) has great potential in the online measurement of the laser ablation process of the ultrathin co-deposition layer on the first mirrors of HL-2A tokamak during the cleaning. The spectroscopic study of the plasma emission can be used to determine the elemental composition of the ablated materials. The co-deposition layer (approximately 0.8 mu m) was completely removed after multiple pulses at 0.76 J/cm(2), but the plasma initiated by the cleaning laser pulse was too weak to produce LIBS signals. Notable enhancement of the signal emission was observed using DP-LIBS. The real-time monitoring and accurate identification the interface boundary can provide important information regarding the cleaned mirror surface in order to avoid under-cleaning. This could help us to develop more effective automatic control of the laser cleaning processes for fusion devices. (C) 2013 Elsevier B.V. All rights reserved.