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(EXP1/08) DT Fusion Power Production in ELM-Free H-Modes in JET

The JET Team¹ (Presented by F. G. Rimini)
¹ See Appendix to IAEA-CN-69/OV1/2

JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom

Abstract.  Experiments in the ELM-free Hot-Ion H-mode regime have been carried out in Deuterium- Tritium plasmas in JET. Initial experiments undertaken at constant NB power, around 11 MW, demonstrated that core fuelling was dominated by wall/target recycling rather than NB fuelling and made it possible to arrange an optimum core DT mix by adjusting the DT mix in wall/target, gas and NB. High power experiments at 4.2MA/3.6T have successfully and reliably delivered fusion power ( P_DT) up to 16.1 MW and plasma stored energy ( W_DIA) of 17 MJ. The results are in good agreement with extrapolations, carried out with TRANSP and JETTO codes, from similar deuterium discharges. Transiently, values of Q_tot around 0.9±0.1 were achieved, consistent with values of n_DT(0)$\tau_{\mathrm{E}}^{}$T_i(0) $\sim$ 9×10²⁰m^{- 3} s keV. The ratio of fusion power to input power Q_IN is in excess of 0.6. There are indications of an isotope effect on the edge pressure pedestal, however no net dependence of global confinement on isotopic plasma composition has been found.

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