L-H transition studies in tritium and deuterium–tritium campaigns at JET with Be wall and W divertor

• Published in: Nuclear fusion Vol. 63; no. 11; pp. 112011 - 112026
• Main Authors: Solano, E.R., Birkenmeier, G., Silva, C., Delabie, E., Hillesheim, J.C., Baciero, A., Balboa, I., Baruzzo, M., Boboc, A., Brix, M., Bernardo, J., Bourdelle, C., Carvalho, I.S., Carvalho, P., Challis, C.D., Chernyshova, M., Chomiczewska, A., Coelho, R., Coffey, I., Craciunescu, T., de la Cal, E., de la Luna, E., Dumont, R., Dumortier, P., Fontana, M., Fontdecaba, J.M., Frassinetti, L., Gallart, D., Garcia, J., Giroud, C., Gromelski, W., Henriques, R.B., Hall, J., Ho, A., Horton, L.D., Horvath, L., Jacquet, P., Jepu, I., Joffrin, E., Kappatou, A., Keeling, D.L., King, D.B., Kiptily, V.G., Kirov, K.K., Kos, D., Kowalska-Strzęciwilk, E., Lennholm, M., Lerche, E., Litherland-Smith, E., Loarte, A., Lomanowski, B., Lomas, P.J., Maggi, C.F., Mailloux, J., Mantsinen, M.J., Maslov, M., Meigs, A.G., Monakhov, I., Morales, R.B., Nielsen, A.H., Nina, D., Noble, C., Pawelec, E., Poradzinski, M., Pucella, G., Puglia, P., Réfy, D., Rasmussen, J. Juul, Righi, E., Rimini, F.G., Robinson, T., Sertoli, M., Silburn, S.A., Sips, G., Sirén, P., Štancar, Ž., Sun, H.J., Szepesi, G., Taylor, D., Tholerus, E., Thomas, B., Verdoolaege, G., Vincenzi, P., Viola, B., Vianello, N., Wilson, T.
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.11.2023
• Subjects: isotope; JET-ILW; L-H transition; power threshold; tokamaks; Tritium
• ISSN: 0029-5515; 1741-4326; 1741-4326
• DOI: 10.1088/1741-4326/acee12

Abstract The recent deuterium–tritium campaign in JET-ILW (DTE2) has provided a unique opportunity to study the isotope dependence of the L-H power threshold in an ITER-like wall environment (Be wall and W divertor). Here we present results from dedicated L-H transition experiments at JET-ILW, documenting the power threshold in tritium and deuterium–tritium plasmas, comparing them with the matching deuterium and hydrogen datasets. From earlier experiments in JET-ILW it is known that as plasma isotopic composition changes from deuterium, through varying deuterium/hydrogen concentrations, to pure hydrogen, the value of the line averaged density at which the threshold is minimum, n ˉ e , min , increases, leading us to expect that n ˉ e , min (T) < n ˉ e , min (DT) < n ˉ e , min (D) < n ˉ e , min (H). The new power threshold data confirms these expectations in most cases, with the corresponding ordering of the minimum power thresholds. We present a comparison of this data to power threshold scalings, used for extrapolation to future devices such as ITER and DEMO.