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arXiv · 2607.23186

Stochastic Dynamics of the Two-Dimensional Low-to-High Transition System Driven by Multiplicative Noise

Yongzhi Li·Shenglan Yuan
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Abstract

This work presents a two-dimensional coupled Low-to-High confinement transition system based on the phenomenological coupling mechanism between zonal flows and turbulent fluctuations at the plasma edge in tokamak magnetic confinement devices. For this two-dimensional system, the corresponding Hamilton-Jacobi equation is derived, and a machine learning approach combining physics-informed neural networks with a loss function designed via vector field decomposition is employed to numerically solve it. This yields information about the system's quasipotential, enabling further computation of the most probable path for the rare event of a state transition in the coupled system. Compared with classical two-dimensional Low-to-High confinement transition models, the proposed system features state variables that are more accessible to experimental measurement and has a more comprehensive physical foundation. Moreover, it self-consistently describes the dynamical behavior of tokamak devices during the startup phase.

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Yongzhi Li, Shenglan Yuan. 2026-07-25. Stochastic Dynamics of the Two-Dimensional Low-to-High Transition System Driven by Multiplicative Noise. https://arxiv.org/abs/2607.23186

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