Tailoring tokamak error fields to control plasma instabilities and transport

Yang, SeongMoo; Park, Jong-Kyu; Jeon, YoungMu; Logan, Nikolas C.; Lee, Jaehyun; Hu, Qiming; Lee, JongHa; Kim, SangKyeun; Kim, Jaewook; Lee, Hyungho; Na, Yong-Su; Hahm, Taik Soo; Choi, Gyungjin; Snipes, Joseph A.; Park, Gunyoung; Ko, Won-Ha

doi:10.1038/s41467-024-45454-1

Title: Tailoring tokamak error fields to control plasma instabilities and transport

Journal Article · 09 February 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-45454-1 · OSTI ID:2310908

^[1];

^[2];

^[3]; Logan, Nikolas C. ^[4]; Lee, Jaehyun ^[3];

^[1]; Lee, JongHa ^[3];

^[1];

^[3]; Lee, Hyungho ^[3];

^[5]; Hahm, Taik Soo ^[5];

^[5];

^[1]; Park, Gunyoung ^[3]; Ko, Won-Ha ^[3]

Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Seoul National Univ. (Korea, Republic of)
Korea Institute of Fusion Energy, Daejeon (Korea, Republic of)
Columbia Univ., New York, NY (United States)
Seoul National Univ. (Korea, Republic of)

A tokamak relies on the axisymmetric magnetic fields to confine fusion plasmas and aims to deliver sustainable and clean energy. However, misalignments arise inevitably in the tokamak construction, leading to small asymmetries in the magnetic field known as error fields (EFs). The EFs have been a major concern in the tokamak approaches because small EFs, even less than 0.1%, can drive a plasma disruption. Meanwhile, the EFs in the tokamak can be favorably used for controlling plasma instabilities, such as edge-localized modes (ELMs). Here we show an optimization that tailors the EFs to maintain an edge 3D response for ELM control with a minimized core 3D response to avoid plasma disruption and unnecessary confinement degradation. We design and demonstrate such an edge-localized 3D response in the KSTAR facility, benefiting from its unique flexibility to change many degrees of freedom in the 3D coil space for the various fusion plasma regimes. This favorable control of the tokamak EF represents a notable advance for designing intrinsically 3D tokamaks to optimize stability and confinement for next-step fusion reactors.

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

Sponsoring Organization:: USDOE; National Research Foundation (NRF); National Research Foundation of Korea

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 2310908

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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