Development of ITB Plasmas at High bN and High d in JET

ITER Non-Inductive (NI) scenario must reach high H factor, HIPB98(y,2) ~ 1.5, and normalised beta, bN ~ 3, with ~50% of bootstrap current (fBS). It relies on producing and maintaining an Internal Transport Barrier (ITB) at large radius (normalised radius r/a > 0.5). Experiments have been carried out in JET to start developing ITB plasmas at high bN and triangularity (d), and study their stability, including the effect of the q profile. Here, the aim was to optimise the core performance with an ITB, rather than rely on a high pedestal pressure as in.
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EFDC070354 761.62 Kb