Hauptseite > Publikationsdatenbank > Modelling of deposition and erosion of injected WF 6 and MoF 6 in TEXTOR > print

001     841763
005     20240711114017.0
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037 _ _ |a FZJ-2018-00067
082 _ _ |a 333.7
100 1 _ |a Kirschner, A.
|0 P:(DE-Juel1)2620
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245 _ _ |a Modelling of deposition and erosion of injected WF 6 and MoF 6 in TEXTOR
260 _ _ |a Amsterdam [u.a.]
|c 2017
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520 _ _ |a Tracer injection experiments in TEXTOR with MoF6 and WF6 lead to local deposition of about 6% for Mo and about 1% for W relative to the injected amount of Mo and W atoms. Modelling of these experiments has been done with ERO applying updated data for physical sputtering. The dissociation of the injected molecules has been treated in a simplified manner due to the lack of dissociation rate coefficients. However, with this it was possible to reproduce the observed radial penetration of Mo and W atoms into the plasma. The modelled local deposition efficiencies are about 50% for Mo and 60% for W assuming typical plasma parameters for the experimental conditions used. To reproduce the measured deposition efficiencies an enhancement factor for the erosion of deposited Mo and W has to be assumed (∼10 for Mo and ∼25 for W). Due to the rather low electron temperature Te of these plasma conditions (Te∼15 eV at the location of injection), Mo and W are mostly sputtered by impurities whereas sputtering due to deuterium is negligible. A parameter study applying larger electron temperature leads to increased sputtering and thus to reduced local deposition efficiencies of about 30% for Mo and 5% for W. Though, even under these conditions enhanced erosion, albeit with reduced enhancement factors, is needed in the modelling to obtain the small measured deposition efficiencies.
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700 1 _ |a Kreter, A.
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700 1 _ |a Wienhold, P.
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700 1 _ |a Weckmann, A.
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700 1 _ |a Pospieszczyk, A.
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700 1 _ |a Ding, R.
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700 1 _ |a Borodin, D.
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700 1 _ |a Brezinsek, S.
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700 1 _ |a Sergienko, G.
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700 1 _ |a Rubel, M.
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700 1 _ |a Linsmeier, Ch.
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773 _ _ |a 10.1016/j.nme.2016.10.022
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