What question did this study set out to answer?

This research aims to develop a real-time model for predicting Type-I ELM crashes using pedestal entropy production.

April 18, 20260 citationsOpen Access

A Phenomenological Analytic Surrogate Model for Pedestal Entropy Production Rate as a Real-Time Scalar Precursor of Type-I ELM Crashes in Tokamaks

Key Points

This research aims to develop a real-time model for predicting Type-I ELM crashes using pedestal entropy production.
Developed a nonlinear surrogate model S(τ) calibrated to experimental data from MHD
Used standard ideal-MHD entropy definitions to frame the model
Validated model predictions against existing experimental heat-flux and pedestal data
Demonstrated order-of-magnitude agreement with observed ELM cycles
Provided a physics-based scalar for real-time monitoring of type-I ELMs
Possessed lightweight computational requirements for practical application

Abstract

The paper, titled “A Phenomenological Analytic Surrogate Model for Pedestal Entropy Production Rate as a Real-Time Scalar Precursor of Type-I ELM Crashes in Tokamaks”, presents a compact, fully analytic nonlinear surrogate S(τ) whose derivative dS/dτ serves as a lightweight, physics-based real-time scalar for detecting the nonlinear crash phase of Type-I ELMs. The model is calibrated directly to 2025 experimental heat-flux and pedestal data (Perillo et al., Lin et al., and KSTAR), uses the standard ideal-MHD entropy definition (Fitzpatrick Eq. 4.45), and is explicitly framed as phenomenological (no microscopic trigger or new physics is claimed). A figure and detailed validation table show order-of-magnitude agreement with the observed ELM cycle.

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