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- W1818531975 abstract "Experiments indicate that neoclassical tearing mode thresholds are lower in plasmas with less momentum injection, in accordance with the expected 'dynamic shielding' effect between seed perturbation and the resonant surface. Elongation and triangularity effects have been deconvolved and results indicate a modest rise in operational βN limit with triangularity. Effects in terms of underlying physics parameters are weak. For triangularity scans and lower elongation cases, this appears to be in accordance with expected trends. 1. Introduction Neoclassical tearing modes (NTMs) may limit performance in the ELMy H-mode regimes in next step devices. NTM physics is complex, not only involving various terms that govern growth of an island, but also dependent on the MHD instability required to 'seed' the island and its coupling to the NTM resonant surface. Thus models have not yet been constrained sufficiently to provide predictive capability (1), and even if this were possible, additional effects in a burning plasmas may change the behaviour further. Heating systems with low momentum injection, such as ICRH, will reduce differential rotation between seeding perturbations and the NTM resonant surface, where shielding currents initially arise opposing island formation; this could also be an issue for burning plasma devices. With low momentum injection less torque should be needed to lock the seed perturbation to the resonant surface, possibly lowering NTM thresholds. In addition, a route to improve plasma performance is to increase the current carrying capacity of the plasma by application of increased shaping. Thus it is important to study shape effects for ITER. It is important to study these effects, both to ascertain their likely role in future burning devices, and to test the underlying physics models that will be used to extrapolate to these scales and specify the requirements of the stabilisation systems. In this paper we describe the results of experiments on JET exploring both of these parameters. We consider the implications, and explanation in terms of underlying physics. These studies focus on the m=3 n=2 NTM, which is experimentally more accessible on JET, occurring at lower βN values. 2. Rotation dependence" @default.
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- W1818531975 date "2001-01-01" @default.
- W1818531975 modified "2023-09-24" @default.
- W1818531975 title "Rotation and shape dependence of neoclassical tearing mode thresholds on JET" @default.
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