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Marseille, France

Naiim Habib M.,CEA Cadarache Center | Mercadier L.,CEA Cadarache Center | Mercadier L.,Laboratoire Lasers | Marandet Y.,French National Center for Scientific Research | And 4 more authors.
Journal of Nuclear Materials | Year: 2011

To check if spectroscopic measurements can be used for erosion determination, we propose to inject in the line of sight of the diagnostic, during plasma operation, a known carbon particle source, produced by laser ablation. A first assessment of this technique will be presented in the context of the Tore Supra tokamak. © 2010 Elsevier B.V. All rights reserved. Source


Vatry A.,Laboratoire Lasers | Vatry A.,French Atomic Energy Commission | Marchand A.,Laboratoire Lasers | Delaporte Ph.,Laboratoire Lasers | And 3 more authors.
Applied Surface Science | Year: 2011

The removal of metallic and carbon particles is a great issue in the framework of the ITER (International Thermonuclear Experimental Reactor) project. Indeed, the presence of these particles in the vessel of a tokamak leads to safety risks. The laser process seems to be a very promising solution for this cleaning. However, the process optimization requires a good knowledge of the removal mechanisms. For this purpose, we investigated the influence of beam parameters, such as laser pulse duration and wavelength, on the cleaning efficiency. In this paper, two kinds of particles are chosen to be studied, carbon aggregates and tungsten droplets, because they are typical of dust collected in tokamak. The results show an influence of beam parameters on the tungsten particles removal efficiency (PRE), whereas this influence is not significant for carbon particles. To help the understanding of the removal mechanisms, substrates and particles were inspected by scanning electron microscopy, before and after the irradiation. We will see on this paper that even if carbon and tungsten particles strongly absorb the different laser wavelength used, the removal mechanisms of these particles are very different. © 2010 Elsevier B.V. All rights reserved. Source


Vatry A.,French Atomic Energy Commission | Vatry A.,Laboratoire Lasers | Grisolia C.,French Atomic Energy Commission | Delaporte P.,Laboratoire Lasers | Sentis M.,Laboratoire Lasers
Fusion Engineering and Design | Year: 2011

Dry Laser Cleaning (DLC) and Laser-induced Shockwave Cleaning (LSC) techniques useful for dust Tokamak control are described. Coupled with a sucking device, DLC can unstick and recover metallic particles but the most efficient laser is an UV one with short pulse duration (less than 10 ns). LSC is able to blow particles from hot area to storage area where they can be recovered after a while. Thus, both DLC and LSC show ITER relevancy at a laboratory scale. They seem both difficult to be integrate in the ITER environment except if they can be embarked on a Remote Handling system. Furthermore, their efficiencies are optimum at atmospheric pressure and this could be not compatible with the ITER Active Gas handling System. © 2011 Elsevier B.V. All rights reserved. Source

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