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Etude des interactions plasma-paroi par imagerie rapide : application aux plasmas de laboratoire et de tokamak

Abstract : The necessity to find a new energy source has lead scientists to explore the way of thermonuclear fusion by magnetic confinement considered as one of the most promising possibility. However the production of such plasmas in the current tokamaks lies to several challenges like the interactions between the plasma and the first wall which spark off the creation of a lot of dust in the plasma which could be problematic for the operation of the next fusion reactors. The knowledge of dust production rates, localisation and transport through the vacuum vessel during plasma phases is of primary importance and must be investigated in preparation of ITER. A time and resource efficient algorithm named TRACE, validated thanks to a dedicated laboratory experiment, is used to detect and track dust particles in ASDEX Upgrade during plasma phase. It allows for automatically analyzing videos originating from fast framing cameras. A statistic about micron sized dust detection rate as a function of cumulated discharge duration is made on a large number of discharges (1470). First analyses covering five last campaigns clearly confirm that the amount of dust is significantly low in most of discharges realized in ASDEX Upgrade, excepted for specific conditions corresponding to off-normal plasma phases (disruptions, strong plasma fluctuations including ELMs, plasma displacement toward PFCs and inefficient absorption of heating power). These observations allow to identify the risky plasma discharges and choose the most efficient plasmas scenarios for ITER. It seems to also confirm the applicability of an all tungsten first wall for future fusion reactors as ITER
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https://hal.univ-lorraine.fr/tel-01749148
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  • HAL Id : tel-01749148, version 1

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Sébastien Bardin. Etude des interactions plasma-paroi par imagerie rapide : application aux plasmas de laboratoire et de tokamak. Autre [cond-mat.other]. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0012⟩. ⟨tel-01749148⟩

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