Analysis of neoclassical tearing mode stabilization experiment by electron cyclotron injection in KSTAR

Cha, MinSoo; Woo, MinHo; Hahn, Sang-hee; Park, Young-Seok; Choi, Minjun J.; Park, Jong-Kyu; Park, Byoung-ho; Rothstein, Andrew; Kolemen, Egemen; Na, Yong-Su

doi:10.1051/epjconf/202431302005

Title: Analysis of neoclassical tearing mode stabilization experiment by electron cyclotron injection in KSTAR

Journal Article · 14 November 2024 · EPJ Web of Conferences (Online)

DOI: https://doi.org/10.1051/epjconf/202431302005 · OSTI ID:2526594

Cha, MinSoo ^[1]; Woo, MinHo ^[2]; Hahn, Sang-hee ^[2]; Park, Young-Seok ^[2]; Choi, Minjun J. ^[2]; Park, Jong-Kyu ^[1]; Park, Byoung-ho ^[2]; Rothstein, Andrew ^[3]; Kolemen, Egemen ^[4]; Na, Yong-Su ^[1]

Seoul National Univ. (Korea, Republic of)
Korea Institute of Science and Technology Information (KISTI), Daejeon (Korea, Republic of)
Princeton Univ., NJ (United States)
Princeton Univ., NJ (United States); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

We report the neoclassical tearing mode (NTM) stabilization experimental results by injection of the electron cyclotron (EC) beam in KSTAR, and its analysis with integrated modelling. In the KSTAR experiment, NTM was intentionally induced and the EC beam was injected by the plasma control system (PCS) to stabilize it. Here, the EC angle was controlled based on the minimum seeking algorithm for the island growth rate. Although the EC angle was not changed significantly, the island width significantly decreased towards the end of the experiment followed by the recovery of plasma performance. To assess the NTM stabilization experiment from a stability perspective, we performed integrated modelling with TRIASSIC utilizing the reconstructed equilibrium with magnetic diagnostics and motional stark effect diagnostics. As a result, we observed that the NTM is stabilized by EC.

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

Sponsoring Organization:: Ministry of Science and ICT (MSIT); National Research Foundation of Korea (NRF); USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2526594

Journal Information:: EPJ Web of Conferences (Online), Journal Name: EPJ Web of Conferences (Online) Vol. 313; ISSN 2100-014X

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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