1 research outputs found
Isotope identity experiments in JET-ILW with H and D L-mode plasmas
NBI-heated L-mode plasmas have been obtained in JET with the Be/W ITER-like wall (JETILW) in H and D, with matched profiles of the dimensionless plasma parameters, 蟻*
, 谓*
, 尾 and
q in the plasma core confinement region and same Ti/Te and Zeff. The achieved isotope identity
indicates that the confinement scale invariance principle is satisfied in the core confinement
region of these plasmas, where the dominant instabilities are Ion Temperature Gradient (ITG)
modes. The dimensionless thermal energy confinement time, 鈩 蟿E,th, and the scaled core
plasma heat diffusivity, A 蠂eff/BT, are identical in H and D within error bars, indicating lack
of isotope mass dependence of the dimensionless L-mode thermal energy confinement time in
JET-ILW. Predictive flux driven simulations with JETTO-TGLF of the H and D identity pair is
in very good agreement with experiment for both isotopes: the stiff core heat transport, typical
of JET-ILW NBI heated L-modes, overcomes the local gyro-Bohm scaling of gradient-driven
TGLF, explaining the lack of isotope mass dependence in the confinement region of these
plasmas. The effect of E 脳 B shearing on the predicted heat and particle transport channels is
found to be negligible for these low beta and low momentum input plasmas.EURATOM 633053RCUK Energy Programme EP/P012450/