LIBS application in Joint European Torus - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Conference Papers Year : 2015

LIBS application in Joint European Torus

Abstract

We present here the results on the first successful application of LIBS for remote in situ diagnostics of PFC in Joint European Torus (JET), the biggest European tokamak (operating with D/T mixture, Be-chamber walls). LIBS in situ application in JET has required a thorough preliminary optimisation and careful adjustment of LIBS interaction parameters, and both optical and detection systems to satisfy the following conditions 10-meter remote measurements; limited apertures of optical windows and mirrors; high vacuum; tritium and Be environments; a very low repetition rate laser; non-accessible interaction zone; limited time for LIBS experiments authorised by JET. LIBS feasibility was demonstrated with JET EDGE LIDAR laser system (a Ruby laser, 3 Joules/pulse, 690 nm wavelength, 300 ps pulse duration, up to 70 GW/cm2 intensity, 1 shot per 5 minutes). A number of analytical spectral lines of D/T, C II, Cr I, W I and Be II in 400-670 nm spectral range were identified. With the increase in the number of the laser shots applied onto a divertor zone (a DL on tungsten-substrate), the spectral line intensities of D/T and from impurities (Cr I, Be II) were decreasing, while the W-spectral lines were appearing in the spectrum. The obtained results and some principal considerations on laser and spectrometer parameters for LIBS in situ application in the modern thermonuclear installations (JET, WEST, ITER), and also particular features of tritium cartography will be presented and discussed.
Fichier principal
Vignette du fichier
201500002400.pdf (22.17 Ko) Télécharger le fichier
2015000024000%20annexe.pdf (1.12 Mo) Télécharger le fichier
Origin : Files produced by the author(s)
Origin : Files produced by the author(s)

Dates and versions

cea-02489571 , version 1 (24-02-2020)

Identifiers

  • HAL Id : cea-02489571 , version 1

Cite

A. Semerok, D. L'Hermite, J-M. Weulersse, J-L. Lacour, C. Grisolia, et al.. LIBS application in Joint European Torus. EMSLIBS’2015 - 8th euro-mediterranean symposium on laser-induced breakdown spectroscopy 2015, Sep 2015, Linz, Austria. ⟨cea-02489571⟩
36 View
24 Download

Share

Gmail Facebook Twitter LinkedIn More