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- W3080774682 abstract "A record performance on JET has been obtained with shear optimization scenarios. A neutron yield of in deuterium discharges, and a global energy confinement improvement above the ITER-89 L-mode scaling with in L-mode and in H-mode have been achieved. The tailoring of plasma current, density and heating power waveforms and current profile control with lower hybrid current drive and ICRF phasing have been essential. Internal energy, particle and momentum transport barriers develop spontaneously upon heating above a threshold power of about 15 MW with neutral beams and ICRH into a low-density target plasma, with a wide central region of slightly negative or flat magnetic shear with q > 1 everywhere. An additional H-mode transition can also raise the pressure in the region between internal and edge transport barriers. The ion heat conductivity falls to the neoclassical level in the improved core confinement region. Pressure profile control through power deposition feedback control makes it possible to work close to the marginal stability boundary for pressure-driven MHD modes. First experiments in deuterium/tritium plasmas, with up to 75% tritium target concentration, have established internal transport barriers already with heating powers at the lowest threshold of pure deuterium plasmas, resulting in a fusion power output of ." @default.
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- W3080774682 date "1997-12-01" @default.
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- W3080774682 title "Shear optimization experiments with current profile control on JET" @default.
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- W3080774682 doi "https://doi.org/10.1088/0741-3335/39/12b/027" @default.
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