Publications Scientifiques

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Author: search.filters.author.Akbi, MohamedSubject: search.filters.subject.Deuterium

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    Quantitative analysis of deuterium in a-C:D layers, a Round Robin experiment
    (2000) Behrisch, R.; Mayer, M.; Jacob, W.; Assmann, W.; Dollinger, G.; Bergmaier, A.; Kreissig, U.; Friedrich, M.; Sun, G.Y.; Hildebrandt, D.; Akbi, Mohamed; Schneider, W.; Schleubner, D.; Knapp, W.; Edelmann, C.
    The absolute amount of deuterium in amorphous deuterated carbon (a-C:D) layers has been measured by six laboratories with di erent techniques, such as MeV ion beam analysis, secondary ion mass spectrometry (SIMS), and thermal desorption spectrometry (TDS). The a-C:D layers have been deposited from a CD 4 glow discharge plasma onto carbon and silicon substrates. The results for the absolute numbers obtained with the di erent analysing techniques show a scatter of up to about 35% around the average value. These deviations are larger than the errors stated by the experimentalists and indicate possible systematic uncertainties in some of the measurements
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    Influence of surface roughness on the deuterium inventoryof ASDEX-UPGRADE divertor tiles
    (1998) Hildebrandt, D.; Akbi, Mohamed; Jüttner, B.; Schneider, W.
    The gas inventory of divertor target tiles used in ASDEX-UPGRADE has been analyzed by thermodesorption spectrometry (TDS°. desorbed gaseous molecules have been measured by heating up complete and cut divertor tiles. the largest samplrs '80X80mm2)could be heated up to temperatures of 1500 K and smaller ones to even higher temperatures.in addition, surface analysis techniques as auger electron spectroscopy (AES),secondary ion mass spectrometry(SIMS), nuclear reaction analysis (NRA), electron microscopy and optical surface profiling have been applied for investigating erosion and deposition phenomena. the original plasma facing surface of the tiles were graphite (EK98) and plasma sprayed tungsten, respectively. the graphite tiles were used from 1991-1995 for about 1900 discharges and the tungsten tiles in 1996 for about 800 discharges...