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Oct 13 – 18, 2014
Hotel Park Inn Pribaltiyskaya
Europe/Moscow timezone

Advancing Power Exhaust Studies from Present to Future Tokamak Devices

Oct 15, 2014, 8:30 AM
4h
Green 8-9 (Hotel Park Inn Pribaltiyskaya)

Green 8-9

Hotel Park Inn Pribaltiyskaya

Saint Petersburg, Russian Federation
Poster Poster 3

Speaker

Dr Marco Wischmeier (Max-Planck-Insitut für Plasmaphysik)

Description

Power exhaust is a crucial issue for future fusion devices such as ITER and DEMO. A device like DEMO despite being of a similar geometrical size of ITER will need to accommodate an about 3 to 4 times higher thermal power, aggravating the issue of power exhaust. ASDEX Upgrade with its fully tungsten covered wall, high ratio of heating power to major radius and extensive edge and SOL diagnostics is well suited for studying most aspects of power exhaust. Limiting the total power flux to the divertor target plates is only possible in the detached regime. Despite its crucial importance for safe operation of future larger devices the understanding of the processes leading to divertor detachment is incomplete. The paper summarizes the efforts undertaken in gradually advancing the understanding of power exhaust in a variety of conditions: It presents how the H-mode density limit is controlled by a fuelling limit and an enhanced loss of power at the plasma edge. The power fall off length in the divertor is determined by the volumetric dissipation in the divertor connected to the recycling of neutrals and consequently to the divertor geometry. Experiments with nitrogen as seeding impurity for L-mode and H-mode are used for validating the SOLPS code package. In such studies the activation of drift terms in the numerical model is crucial for minimizing the differences to the experimental data. The movement of the radiation in the divertor under varying conditions is explained and maximum radiation is reached with stable radiation in the vicinity of the X-point. A phase of strong fluctuating radiation in the vicinity of the X-point on the high field side of the divertor is identified as a condition for strongest discrepancy between the numerical and experimental results. Studies on the snowflake as an alternative divertor geometry solution using the EMC3-EIRENE code are also presented.
Paper Number EX/P3-16
Country or International Organisation Germany

Primary author

Dr Marco Wischmeier (Max-Planck-Insitut für Plasmaphysik)

Co-authors

Dr Andrea Scarabosio (Max-Planck-Insitut für Plasmaphysik) Dr Arne Kallenbach (Max-Planck-Institut f. Plasmaphysik) Dr Bernert Matthias (Max-Planck-Institut für Plasmaphysik) Dr Daniel Carralero (Max-Planck-Insitut für Plasmaphysik) Dr David Coster (Max-Planck-Insitut für Plasmaphysik) Mr Felix Reimhold (Max-Planck-Insitut für Plasmaphysik) Dr Hans-Werner Müller (Max-Planck-Insitut für Plasmaphysik) Dr Leena Aho-Mantila (VTT Technical Research Centre of Finland) Mr Sieglin Bernhard (Max-Planck-Insitut für Plasmaphysik) Dr Steffen Potzel (Max-Planck-Insitut für Plasmaphysik) Dr Thomas Eich (Max-Planck-Institute for Plasma Physics) Dr Tilmann Lunt (Max-Planck-Insitut für Plasmaphysik)

Presentation materials

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