ICRF scenarios for ITER’s halffield phase

ICRF scenarios for ITER’s halffield phase

ICRF scenarios for ITER’s halffield phase 150 150 Mathew

ICRF scenarios for ITER’s halffield phase

The non-active operation phase of ITER will be done in H|4 He plasmas at half the nominal magnetic field, B 0 =2.65T. At this field|for the given frequency range of the ICRF system (f=40-55MHz), three ICRF heating scenarios are available a priori : (i) Fundamental ICRH of majority H plasmas at f?40MHz, (ii) second harmonic (N=2) 3 He ICRH in H plasmas at f?53MHz|(iii) fundamental minority H heating in 4 He plasmas at f?40MHz. While the latter is expected to perform well for not too large H concentrations, the heating scenarios available for the Hydrogen plasmas are less robust. Recent JET experiments performed in similar conditions to those expected in ITER’s half-field phase confirmed the low performance of these two scenarios|numerical simulations have shown that the situation is not much improved in ITER, mainly because of the rather modest plasma temperature|density expected in its initial operation phase. A summary of the main experimental results obtained at JET followed by numerical predictions for ITER’s half-field ICRF heating scenarios will be presented.

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01/01/2011