Isotope identity experiments in JET-ILW with H and D L-mode plasmas
Journal article, 2019

NBI-heated L-mode plasmas have been obtained in JET with the Be/W ITER-like wall (JET-ILW) in H and D, with matched profiles of the dimensionless plasma parameters, rho*, nu*, beta and q in the plasma core confinement region and same T-i/T-e and Z(eff). 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, Omega(i) tau(E,th), and the scaled core plasma heat diffusivity, A chi(eff)/B-T, 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 x B shearing on the predicted heat and particle transport channels is found to be negligible for these low beta and low momentum input plasmas.

JET-ILW

isotope identity

tokamak plasmas

Author

C. F. Maggi

Culham Science Centre

EUROfusion Consortium

H. Weisen

EUROfusion Consortium

Ecole Polytechnique Federale De Lausanne

F. J. Casson

EUROfusion Consortium

Culham Science Centre

F. Auriemma

Consorzio Rfx

EUROfusion Consortium

R. Lorenzini

EUROfusion Consortium

Consorzio Rfx

Hans Nordman

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Plasma Physics and Fusion Energy

EUROfusion Consortium

E. Delabie

EUROfusion Consortium

Oak Ridge National Laboratory

Fredrik Eriksson

EUROfusion Consortium

Chalmers, Physics, Materials and Surface Theory

J. Flanagan

EUROfusion Consortium

Culham Science Centre

D. Keeling

Culham Science Centre

EUROfusion Consortium

D. King

EUROfusion Consortium

Culham Science Centre

L. Horvath

University of York

EUROfusion Consortium

S. Menmuir

Culham Science Centre

EUROfusion Consortium

A. Salmi

EUROfusion Consortium

Technical Research Centre of Finland (VTT)

G. Sips

European Commission (EC)

EUROfusion Consortium

T. Tala

Technical Research Centre of Finland (VTT)

EUROfusion Consortium

I Voitsekhovich

Culham Science Centre

EUROfusion Consortium

Nuclear Fusion

0029-5515 (ISSN)

Vol. 59 7 076028

Subject Categories

Subatomic Physics

Energy Engineering

Fusion, Plasma and Space Physics

Infrastructure

Onsala Space Observatory

DOI

10.1088/1741-4326/ab1ccd

More information

Latest update

1/30/2020