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Sökning: WFRF:(Thro P. Y.)

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1.
  • Leontyev, A., et al. (författare)
  • Theoretical and experimental studies on molybdenum and stainless steel mirrors cleaning by high repetition rate laser beam
  • 2011
  • Ingår i: Fusion engineering and design. - : Elsevier BV. - 0920-3796 .- 1873-7196. ; 86:9-11, s. 1728-1731
  • Tidskriftsartikel (refereegranskat)abstract
    • Our studies were aimed to determine the damage threshold of molybdenum (Mo) and stainless steel (SS) mirrors to provide the maximum fluence which the mirror surfaces could withstand without affecting their reflectivity properties. A high repetition rate ytterbium fiber laser (20 kHz, 1.06 mu m, 120 ns) was applied. The experimental single-pulse and multiple-pulse damage thresholds were obtained. To calculate damage thresholds, a 1D analytical model which takes into account the temperature dependent absorptance and multiple-pulse damage based on plastic deformations accumulation was applied. The experimental damage thresholds and the theoretical ones are in a good agreement. Cleaning tests with the contaminated mirrors exposed in JET have been performed.
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2.
  • Widdowson, A., et al. (författare)
  • Removal of beryllium-containing films deposited in JET from mirror surfaces by laser cleaning
  • 2011
  • Ingår i: Journal of Nuclear Materials. - : Elsevier BV. - 0022-3115 .- 1873-4820. ; 415:1, s. S1199-S1202
  • Tidskriftsartikel (refereegranskat)abstract
    • A set of stainless steel (SS) and molybdenum mirror samples located in the divertor and at the outer mid-plane of the vessel were exposed in JET from 2005 to 2007. A selection of these mirror samples with well adhered deposits (i.e. not flaking) of up to a few hundred nanometers in thickness and with Be/C ratios ranging from 0 to similar to 1 have been cleaned using a laser system developed at CEA, Saclay. Following laser cleaning the recovered reflectivity was generally better in the infrared than the visible spectrum, with recovery of up to 90% of the initial reflectivity being obtained at 1600 nm for both Mo and SS mirrors falling as low as 20-30% of initial reflectivity at a wavelength of 400 nm for some SS mirrors, rising to similar to 80% for Mo mirrors. Some deposit remained on the mirrors after the cleaning trials.
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  • Resultat 1-2 av 2
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refereegranskat (2)
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Semerok, A (2)
Widdowson, A. (2)
Leontyev, A. (2)
Farcage, D. (2)
Thro, P. -Y (2)
Rubel, Marek J. (1)
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Schmidt, A. (1)
Rubel, Marek (1)
Grisolia, C (1)
Ivanova, Darya (1)
Coad, J. P. (1)
De Temmerman, G. (1)
Coad, P. (1)
Hole, D. (1)
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2011 (2)

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