Real time detection of multiple stable MHD eigenmode growth rates towards kink/tearing modes avoidance in DIII-D tokamak plasmas

Liu, Tong; Munaretto, Stefano; Logan, Nikolas; Wang, Zhirui; Boyer, Mark D.; Wang, Zheng-Xiong; Erickson, Keith; Park, Jong-Kyu

doi:10.1088/1741-4326/ad0bce

Title: Real time detection of multiple stable MHD eigenmode growth rates towards kink/tearing modes avoidance in DIII-D tokamak plasmas

Journal Article · 10 November 2023 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad0bce · OSTI ID:2222543

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Dalian University of Technology (China)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Commonwealth Fusion Systems, Devens, MA (United States)

Real time detection of time evolving growth rates of multiple stable eigenmodes has been achieved in DIII-D tokamak experiments via multi-mode three-dimensional (3D) active magnetohydrodynamic (MHD) spectroscopy. The measured evolution of the multi-modes' growth rates is in good accordance with the variation of the plasma βN. Using experimental equilibria, resistive MARS-F simulations found the two least stable modes to have comparable growth rates to those experimentally measured. Real time and offline calculations of the modes' growth rates show comparable results and indicate that cleaner system input and output signals will improve the accuracy of the real time stability detection. Moreover, the shortest real time updating time window of multi-mode eigenvalues can be about 2ms in DIII-D experiments. This real time monitoring of stable, macroscopic kink and tearing modes thus provides an effective tool for avoidance of the most common causes of tokamak disruption.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Natural Science Foundation of China (NSFC); USDOE

Grant/Contract Number:: AC52-07NA27344; FC02-04ER54698; AC02-09CH11466; 11925501; 12105034

OSTI ID:: 2222543

Alternate ID(s):: OSTI ID: 2205406; OSTI ID: 2217311

Journal Information:: Nuclear Fusion, Vol. 64, Issue 1; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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