Cross-analysis of magnetic and current density field topologies using experimental data in a Quiescent H-mode tokamak discharge
Résumé
In axisymmetric fusion devices, such as tokamaks, the winding of the magnetic field is characterized by the safety profile q = qB . Similarly, the winding of the current density field can be characterized by qJ. Currently, the study of the relationship between the qB and qJ profiles in relation to the confinement properties of tokamak plasmas remains unexplored, as the qJ profile is neither computed nor considered. Here some reconstruction of the current density winding profile is presented from experimental data in the Quiescent H-mode. The (qB, qJ)-derived topology analysis indicates a large central plasma region unaffected by current filamentation-driven resonant magnetic perturbations, while the outer region harbors a spectrum of such current filament-induced magnetic resonant modes that degrade peripheral confinement. The results suggest a QH-mode signature pattern requiring further reinforcement by additional data. Implementing (qB, qJ) real-time monitoring could uncover insights into tokamak confinement regimes with important implications.
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