Latest JET results in deuterium and deuterium - tritium plasmas

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Abstract
All major JET systems have been fully commissioned for D - T and the DTE1 series of experiments has started with the D - T fuel mixture and operating conditions foreseen for ITER. In the area of ITER physics, significant results have been produced in both D - D and D - T. In D-D, the L - H threshold power database has been extended, the bounds on edge-electron temperature and density in ELMy H-modes have been defined and the advantages of Types I and III ELMy discharges have been compared. In D - T plasmas, the isotope effect on H-mode threshold power and transport has been determined so that a more accurate assessment can be made of the ignition margin and heating requirements for ITER. Trace tritium experiments have provided first particle transport measurements and an assessment of the ITER reference ion-cyclotron resonance-frequency heating scenarios has been started. In the area of fusion performance, record D - D neutron yields have been obtained by controlling the plasma and current profiles in hot ion ELM-free H-modes and optimized shear modes. In D - T, internal transport barriers have been readily established in optimized shear discharges and Alfvén eigenmodes have been observed.
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