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Recent progress in L-H transition studies at JET: Tritium, helium, hydrogen and deuterium

Solano E.R.; Delabie E.; Birkenmeier G.; Silva C.; Hillesheim J.C.; Vincenzi P.; Nielsen A.H.; Rasmussen J.J.; Baciero A.; Aleiferis S.; Balboa I.; Boboc A.; Bourdelle C.; Carvalho I.S.; Carvalho P.; Chernyshova M.; Coelho R.; Craciunescu T.; Dumont R.; Dumortier P.; Luna E.D.L.; Flanagan J.; Fontana M.; Fontdecaba J.M.; Frassinetti L.; Gallart D.; Garcia J.; Giovannozzi E.; Giroud C.; Gromelski W.; Henriques R.; Horvath L.; Jacquet P.; Jepu I.; Kappatou A.; Keeling D.L.; King D.; Kowalska-Strzeciwilk E.; Lennholm M.; Lerche E.; Litherland-Smith E.; Kiptily V.; Kirov K.; Loarte A.; Lomanowski B.; Maggi C.F.; Mantsinen M.J.; Manzanares A.; Maslov M.; Meigs A.G.; Monakhov I.; Morales R.B.; Nina D.; Noble C.; Parail V.; Diaz F.P.; Pawelec E.; Pucella G.; Refy D.; Righi-Steele E.; Rimini F.G.; Robinson T.; Saarelma S.; Sertoli M.; Shaw A.; Silburn S.; Siren P.; Stancar A.; Sun H.; Szepesi G.; Taylor D.; Tholerus E.; Vartanian S.; Verdoolaege G.; Viola B.; Weisen H.; Wilson T.

Journal: Nuclear fusion (Online) 62 (7), pp. 076026-1 - 076026-11 Year: 2022
ISTP Authors:
Pietro Vincenzi
Keywords: , , ,
Research Activitie:

We present an overview of results from a series of L-H transition experiments undertaken at JET since the installation of the ITER-like-wall (JET-ILW), with beryllium wall tiles and a tungsten divertor. Tritium, helium and deuterium plasmas have been investigated. Initial results in tritium show ohmic L-H transitions at low density and the power threshold for the L-H transition (P LH) is lower in tritium plasmas than in deuterium ones at low densities, while we still lack contrasted data to provide a scaling at high densities. In helium plasmas there is a notable shift of the density at which the power threshold is minimum ( n¯e,min ) to higher values relative to deuterium and hydrogen references. Above n¯e,min (He) the L-H power threshold at high densities is similar for D and He plasmas. Transport modelling in slab geometry shows that in helium neoclassical transport competes with interchange-driven transport, unlike in hydrogen isotopes. Measurements of the radial electric field in deuterium plasmas show that E r shear is not a good indicator of proximity to the L-H transition. Transport analysis of ion heat flux in deuterium plasmas show a non-linearity as density is decreased below n¯e,min . Lastly, a regression of the JET-ILW deuterium data is compared to the 2008 ITPA scaling law.

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