Progress in the development of the ITER baseline scenario in TCV

• Under the auspices of EUROfusion, the ITER baseline (IBL) scenario has been jointly investigated on AUG and TCV in the past years and this paper reports on the developments on TCV. Three ITER shapes, namely the JET, AUG and ITER IBL have been reproduced in TCV, illustrating that the higher the triangularity the larger the ELM perturbation and the more difficult it is to reach stationary states with q(95)< 3.6. It is found that the performance of TCV IBL is mainly limited by (neoclassical) tearing modes, in particular 2/1 modes which are triggered after a large ELM. It is demonstrated that the shorter the ELM period the larger beta(N) at the NTM onset. We show that these modes can be avoided with central X3 EC heating at relatively high q(95) and moderate beta(N). However, the lack of significant ECH at the high central densities obtained in TCV IBL scenario limits the duration of low q(95) cases to about four confinement times. During this time, density usually keeps peaking until (neoclassical) tearing modes are triggered. Nevertheless, the TCV IBL database covers the ITER target values (H-98y2 similar to 1, beta(N) similar to 1.8 at q(95 )similar to 3) and a slightly better confinement than requested for ITER is

Ämnesord

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

Nyckelord

ITER baseline scenario

pedestals

neoclassical tearing modes

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art (ämneskategori)

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