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

   
The JET Team ¹ (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  ($\rm P_{DT}$) up to 16.1 MW and plasma stored energy ($\rm W_{DIA}$) 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 $\rm Q_{tot}$ around $0.9 \pm 0.1$ were achieved, consistent with values of $\rm n_{DT}(0) \tau_E T_i(0) \sim 9 \times 10^{20} m^{-3}$ s keV. The ratio of fusion power to input power $\rm Q_{IN}$ 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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