The required heating power, P L H , 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 L H , 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 L H is not the same in plasmas with the same effective isotope mass, A e f f , when they differ in their isotope composition. Thus, A e f f is not sufficient to describe the isotope effect of P L H 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 L H , and an effective heat diffusivity, ? e f f , 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 L H .<\/p>\n","protected":false},"excerpt":{"rendered":"
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.; Siren 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.<\/p>\n","protected":false},"featured_media":1294,"comment_status":"closed","ping_status":"open","template":"","meta":[],"product_cat":[574],"product_tag":[761,1487,4590,4591,4592,4593],"class_list":["post-10588","product","type-product","status-publish","has-post-thumbnail","hentry","product_cat-journal-articles","product_tag-transport","product_tag-l-h-transition","product_tag-d-t-plasma-operation","product_tag-isotope-effects","product_tag-isotope-mixtures","product_tag-tritium-plasmas","prodpage-style2"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product\/10588","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/comments?post=10588"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media\/1294"}],"wp:attachment":[{"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/media?parent=10588"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_cat?post=10588"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.istp.cnr.it\/it\/wp-json\/wp\/v2\/product_tag?post=10588"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}