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The role of isotope mass and transport for H-mode access in tritium containing plasmas at JET with ITER-like wall

The required heating power, P LH , to access the high confinement regime (H-mode) in tritium containing plasmas is investigated in JET with ITER-like wall at a toroidal magnetic field of B t = 1.8 T and a plasma current of I p = 1.7 MA. P LH , also referred to as the L-H power threshold, is determin...

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Published in:Plasma physics and controlled fusion 2023-05, Vol.65 (5), p.54001
Main Authors: Birkenmeier, G, Solano, E R, Carvalho, I S, Hillesheim, J C, Delabie, E, Lerche, E, Taylor, D, Gallart, D, Mantsinen, M J, Silva, C, Angioni, C, Ryter, F, Carvalho, P, Fontana, M, Pawelec, E, Silburn, S A, Sirén, P, Aleiferis, S, Bernardo, J, Boboc, A, Douai, D, Puglia, P, Jacquet, P, Litherland-Smith, E, Jepu, I, Kos, D, Sun, H J, Shaw, A, King, D, Viola, B, Henriques, R, Kirov, K K, Baruzzo, M, Garcia, J, Hakola, A, Huber, A, Joffrin, E, Keeling, D, Kappatou, A, Lennholm, M, Lomas, P, de la Luna, E, Maggi, C F, Mailloux, J, Maslov, M, Rimini, F G, Vianello, N, Verdoolaege, G, Weisen, H, Wischmeier, M
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Language:English
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Summary:The required heating power, P LH , to access the high confinement regime (H-mode) in tritium containing plasmas is investigated in JET with ITER-like wall at a toroidal magnetic field of B t = 1.8 T and a plasma current of I p = 1.7 MA. P LH , also referred to as the L-H power threshold, is determined in plasmas of pure tritium as well as mixtures of hydrogen with tritium (H-T) and mixtures of deuterium with tritium (D-T), and is compared to the L-H power threshold in plasmas of pure hydrogen and pure deuterium. It is found that, for otherwise constant parameters, P LH is not the same in plasmas with the same effective isotope mass, A eff , when they differ in their isotope composition. Thus, A eff is not sufficient to describe the isotope effect of P LH in a consistent manner for all considered isotopes and isotope mixtures. The electron temperature profiles measured at the L-H transition in the outer half of the radius are very similar for all isotopes and isotope mixtures, despite the fact that the L-H power threshold varies by a factor of about six. This finding, together with the observation of an offset linear relation between the L-H power threshold, P LH , and an effective heat diffusivity, χ eff , indicates that the composition-dependent heat transport in the low confinement mode (L-mode) determines, how much power is needed to reach the necessary electron temperatures at the edge, and hence P LH .
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/acc423