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Beta dependence of confinement in JET ELMy H-modes

Beta dependence of confinement in JET ELMy H-modes. D C McDonald, C Giroud, L Laborde, M Brix, R Buttery, E de la Luna, A Fonseca, N Hawkes, J Hobirk, D Howell, S Jachmich, E Joffrin, R Koslowski, H Leggate, I Nunes, C Perez Von Thun, I Voitsekhovitch, and JET EFDA contributors.

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Beta dependence of confinement in JET ELMy H-modes

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  1. Beta dependence of confinement in JET ELMy H-modes D C McDonald, C Giroud, L Laborde, M Brix, R Buttery, E de la Luna, A Fonseca, N Hawkes, J Hobirk, D Howell, S Jachmich, E Joffrin, R Koslowski, H Leggate, I Nunes, C Perez Von Thun, I Voitsekhovitch, and JET EFDA contributors Structure of talk: • Introduction and background • Beta scan results • Modelling • Conclusions Darren McDonald, ITPA meeting, 3rd October 2007

  2. Previous JET b scans Darren McDonald, ITPA meeting, 3rd October 2007

  3. Previous scans Darren McDonald, ITPA meeting, 3rd October 2007

  4. PNBI (MW) ne/B2 (1019 m-3 T-2) <Te>/B2 (keV T-2) q95 Da (ph sr-1 cm-2 s-1) Time (s) JET b scan: match Darren McDonald, ITPA meeting, 3rd October 2007

  5. JET b scan: profile match 68590, bN=2.0 68595, bN=1.7 68686, bN=1.4 Darren McDonald, ITPA meeting, 3rd October 2007

  6. 68590, bN=2.0 68595, bN=1.7 68686, bN=1.4 JET b scan: confinement Darren McDonald, ITPA meeting, 3rd October 2007

  7. JET b scan: core + edge Darren McDonald, ITPA meeting, 3rd October 2007

  8. Why different b scalings? Darren McDonald, ITPA meeting, 3rd October 2007

  9. Interpretative scans around #68595, ceff averaged over 0.3<r<0.7 JET b scan: modelling Interpretative scans around #68595, r=0.6 Darren McDonald, ITPA meeting, 3rd October 2007

  10. Conclusions • A b scan on JET has shown decreasing confinement with increasing b. It was performed in a scenario with a hybrid preheat. • Different from previous ELMy H-mode b scans • Experiments and wider dataset suggests that decreasing confinement with increasing b associated with high triangularity, d>0.3, JET plasmas. • No sign that the q-profile differs from normal ELMy H-mode q-profile. • Modelling shows a stabilisation of ETG can quantitatively reproduce the results, but modelling of scans is found to be sensitive to parameter matches. • Further experiments to clarify effect of plasma shape on transport and confinement at high b. Darren McDonald, ITPA meeting, 3rd October 2007

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