Experimental Observation Of Magnetic Island Heteroclinic Bifurcation In Tokamaks
PHYSICAL REVIEW LETTERS(2021)
摘要
We report empirical observations of magnetic island heteroclinic bifurcation for the first time. This behavior is observed in interacting coupled 2/1 tearing modes in the core of a DIII-D tokamak plasma. Poincare maps constrained by measured magnetic amplitudes and phasing show bifurcation from heteroclinic to homoclinic topology in the 2/1 island as the 4/2 relative amplitude (R-4/2) decreases. Initially, the local electron temperature peak in the 2/1 island splits, consistent with two O points. As R-4/2 decreases a single peak forms, consistent with one O point. These call for developing tearing stability theory and control solutions for heteroclinic islands in tokamaks.
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