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This paper describes the effect of the isotopic mass on plasma parameters as observed in the ASDEX tokamak. It comprises ohmic as well as L-mode, H-mode and H*-mode scenarios. The measurements reveal that the ion mass is a substantial and robust parameter which affects all confinement times (energy, particle and momentum) in the whole operational window. Both core and edge properties change with the isotopic mass. Specific emphasis is given to the edge parameters and changes of the edge plasma due to carbonisation and boronisation. The pronounced isotope dependence of edge and divertor parameters are explained by the secondary effect of different power fluxes into the scrape-off layer plasma and onto the divertor plates. Finally, the observations serve to test different transport theories. With respect to the ion temperature gradient driven turbulence, the isotope effect is also studied in pellet refuelled discharges with peaked density profiles. The results from ASDEX are compared with those from other experiments.

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Authors: BESSENROOT-WEBERPALS M, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);WAGNER F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ASDEX TEAM ET AL., Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 3/189 EN (1993) 72 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
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