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(EXP1/05) High Performance with Modified Shear in JET D-D and D-T Plasmas

(This paper was rapporteured in lecture CD2/EX9/4)

The JET Team¹ (presented by C. Gormezano)
¹ See Appendix to IAEA-CN-69/OV1/2

JET Joint Undertaking, Abingdon, Oxfordshire, United Kingdom

Abstract.  The observation of Internal Transport Barriers (ITBs) in which ion thermal diffusivity is reduced to a neo- classical level and the electron thermal diffusivity is substantially reduced has been made in JET with the optimised shear scenario with the MkII divertor both in D-D and in D-T. Central ion temperatures of 40keV and plasma pressure gradient of 10⁶ Pa/m were observed in D-T leading to a fusion triple product n_iT_i$\tau_{\mathrm{E}}^{}$ = 1×10²¹m^{- 3} keVs and 8.2MW of fusion power. ITBs have also been produced in the new Gas Box divertor configuration with a similar behaviour. With the new divertor an L-mode edge has only been produced using edge radiation cooling. For the first time, ITBs have been triggered by radiating about 40% of the power with a krypton puff. A tentative scaling of the power needed to trigger an ITB with magnetic field is indicated.

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