2. DTプラズマの輸送(<小特集> TFTRのDT実験)

概要

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Heat and particle transport of DT supershot plasmas and high β_p mode plasmas have been analyzed by transport code TRANSP. In supershot plasmas, dependence of transport scaling on average isotropic mass <A> is quite strong like W_<tot>∝<A>^<0.82±0.05>, W_<thermal>∝<A><0.89±0.10>, χ^<tot>_i∝<A>^<-2.6±0.03> and D_e∝<A>^<-1.4±0.2> with fixed heating power. For fixed local parameters χ^<tot>_i∝<A>^<-1.8±0.2> is obtained. Mass dependence of χ^<tot>_i is relatively weak. In high β_p regime, in which current ramp down method is adopted to get high l_i value, H mode characteristics are compared between DT and D plasmas. Longer ELM free period with larger energy confinement improvement is observed in DT plasmas. After the H transition, reduction of χ^<tot>_i in r/a>0.5 is remarkable in DT plasmas. The density fluctuation level n/n measured by beam emission spectroscopy, however, does not show much difference between DT and D plasmas.
社団法人プラズマ・核融合学会の論文
1995-03-25