| Partner: P. Gąsior |
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Recent publications
| 1. | Wołowski J.♦, Gąsior P.♦, Hoffman J., Kubkowska M.♦, Rosiński M.♦, Szymański Z., Study of laser-induced removal of co-deposits from tokamak plasma-facing components using ion diagnostics and optical spectroscopy, RADIATION EFFECTS AND DEFECTS IN SOLIDS, ISSN: 1042-0150, Vol.165, No.6, pp.434-440, 2010 Abstract: The paper presents studies of the application of ion diagnostics and optical spectroscopy for on-line measurement of the amount and characteristics of co-deposits from the laser-ablated surface of the plasmafacing components (e.g. graphite tiles). For removal of the co-deposit layer a repetitive Nd:YAG laser was used. Determination of the characteristics of ions emitted from the laser-illuminated targets was performed using ion collectors (on the basis of a time-of-flight method) and an optical spectrometer. The main ion stream parameters and spectral lines of deuterium and carbon or tungsten ions were measured depending on laser pulse parameters. The research proved that optical spectroscopy could be a convenient method for on-line observation of the co-deposited layer removal by means of laser ablation. In combination with the investigation of collected co-deposit dust, the performed study made it possible to state that laser-induced breakdown spectroscopy can be useful as a diagnostic method for the ablative co-deposited layer removal and the wall conditioning. The properties of modified surfaces of samples and collected dust (evaporated co-deposit) were determined using different measuring methods. Keywords:laser ablation, laser-induced co-deposit removal, ion diagnostics and optical spectroscopy Affiliations:
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| 2. | Gąsior P.♦, Czarnecka A.♦, Parys P.♦, Rosiński M.♦, Wołowski J.♦, Hoffman J., Szymański Z., Phillips V.♦, Rubel M.♦, Effective laser induced removal of co-deposited layers from plasma facing components in tokamak, CZECHOSLOVAK JOURNAL OF PHYSICS, ISSN: 0011-4626, Vol.56, pp.B67-B72, 2006 Abstract: An experimental set–up and spectroscopy diagnostic method for laser–induced fuel removal and decomposition of co–deposited layers on plasma–facing components from tokamaks are described. For irradiation of a graphite limiter tile from the TEXTOR tokamak Nd:YAG 3.5-ns pulse laser with a repetition rate of 10 Hz and single pulse energy of up to 0,8 J at 1,06 µm has been used. The spectroscopy system allowed recording of spectra in the visible wavelength range including CII and Dα spectral lines. The evolution of CII and Dα spectral lines was observed pulse–by–pulse during the co–deposit removal. The efficient ablation of the 45 µm thick co–deposit occured after approximately 50 laser pulses. Keywords:tokamaks, laser ablation, spectroscopy, co–deposit removal Affiliations:
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