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

Plasma Isotopic Change over Experiments in JET under Carbon and ITER-like Wall Conditions

Oct 16, 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 5

Speaker

Dr Thierry Loarer (CEA, IRFM, France)

Description

In ITER, isotopic exchange by deuterium could be envisaged as a method for minimising the tritium inventory in the vessel. In JET ITER-Like Wall (JET-ILW) an isotopic plasma wall changeover experiment has been carried out to determine the amount of particle accessible by changing the plasma from H to D. The results of this series are presented and discussed in this paper. Starting with a wall devoid of D2 and preloaded in H2, change over experiments from H2 to D2 has been carried out in JET-ILW. 13 repetitive pulses have been performed under conditions of: Ip=2.0MA, BT=2.4T, <ne>=4.5x1019m-3, a gas injection of 6.0x1021Ds-1 and 0.5MW of ICRH. During the plateau phase, the strike points were moved from vertical to horizontal divertor targets. The gas balance analysis integrated over the experimental session shows that the total amount of H removed from the wall is in the range of 1-3x1022H. The H concentration is shown to be lower than 10% in the plasma after 4 pulses and below 4.5% after 13 pulses. These results are compared with the T-D change over experiments performed during the DT campaign in JET-C which exhibits an amount of T removed from the wall of 2x1023T with 10% of T concentration after 10 discharges. Finally, evaluation of isotopic plasma wall changeover as a method for minimising the fuel inventory in full metallic devices like JET-ILWand ITER is discussed. This work was supported by EURATOM and carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission.
Paper Number EX/P5-27
Country or International Organisation France

Primary author

Dr Thierry Loarer (CEA, IRFM, France)

Co-authors

Mr David DOUAI (CEA, IRFM, Association Euratom-CEA, 13108 St Paul lez Durance, France) Dr Sebastijan Brezinsek (Forschungszentrum Jülich) Dr Volker Philipps Philipps (Forschungszentrum Jülich)

Presentation materials