Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• Plasma physics and controlled fusion, 2023-05, Vol.65 (5), p.54001

Ort / Verlag

United States: IOP Publishing

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract 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 .