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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 Team ¹ (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 $10^6$ Pa/m were observed in D-T leading to a fusion triple product  $\rm n_i T_i \tau_E = 1 \times 10^{21} m^{-3}$ 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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