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Integrated Core‐SOL Simulations of ITER H‐Mode Scenarios with Different Pedestal Density
Author(s) -
IvanovaStanik I.,
Koechl F.,
Voitsekhovitch I.,
Telesca G.,
Zagörski R.
Publication year - 2014
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.201410050
Subject(s) - divertor , pedestal , tungsten , atomic physics , plasma , materials science , power density , neon , core (optical fiber) , tokamak , physics , coupling (piping) , power (physics) , nuclear physics , thermodynamics , optics , argon , archaeology , metallurgy , history
Fusion performance of ITER H‐mode plasmas in presence of intrinsic (He, Be and W) and seeded (Ne) im purities is investigated in self‐consistent core‐pedestal‐SOL simulations for two values of pedestal density n ped e = 6.12 × 10 19 m –3 (reference case) and 9 × 10 19 m –3 using the JETTO and COREDIV codes iteratively. The theory‐based GLF23 transport model which predicts a relatively high density peaking ( n e 0 /〈 n e 〉 = 1.37 ÷ 1.39) has been used for this study. For medium density case the H‐mode operation with a power across the separatrix well above the L‐H power threshold has been obtained, but the divertor heat loads exceed 10 MW/m 2 . Neon gas puff strongly reduces the power to divertor plate in this scenario, increasing at the same time the tungsten sputtering by Ne that leads to even larger core radiation and dilution, than in the case without Ne. As a result, the medium density H‐mode operation with Ne seeding and low divertor heat loads is barely above the L‐H power threshold. This operational point is weakly sensitive to tungsten inward pinch due to a strong coupling between W transport, radiation and sputtering. At high density with much larger core radiation (90 MW), the possibility of H‐mode operation strongly depends on the choice transport model, with the power through the separatrix well below (above) the L‐H power threshold in simulations with the GLF23 ( H 98 y scaling‐based) transport model. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)