Gyrokinetic simulations of the effects of magnetic islands on microturbulence in KSTAR

Wei, Xishuo; Nicolau, Javier H.; Choi, Gyungjin; Lin, Zhihong; Yang, Seong-Moo; Kim, SangKyeun; Lee, WooChang; Zhao, Chen; Cote, Tyler; Park, JongKyu; Orlov, Dmitri

doi:10.1088/1741-4326/ada049

Title: Gyrokinetic simulations of the effects of magnetic islands on microturbulence in KSTAR

Journal Article · 06 January 2025 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ada049 · OSTI ID:2496746

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^[3]; Kim, SangKyeun ^[4];

^[5]; Zhao, Chen ^[6];

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Univ. of California, Irvine, CA (United States)
Univ. of California, Irvine, CA (United States); Korea Advanced Institute Science and Technology (KAIST), Daejeon (Korea, Republic of)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)
Korea Advanced Institute Science and Technology (KAIST), Daejeon (Korea, Republic of)
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Seoul National Univ. (Korea, Republic of)
Univ. of California, San Diego, CA (United States)

Gyrokinetic simulations are utilized to study effects of magnetic islands (MIs) on the ion temperature gradient (ITG) turbulence in the KSTAR tokamak with resonant magnetic perturbations. Simulations show that the transport is controlled by the nonlinear interactions between the ITG turbulence and self-generated vortex flows and zonal flows, leading to an anisotropic structure of fluctuation and transport on the poloidal plane and in the toroidal direction. MIs greatly enhance turbulent transport of both particle and heat. The turbulent transport exhibits variations in the toroidal direction, with transport through the resonant layer near the island X-point being enhanced when the X-point is located at the outer mid-plane. A quantitative agreement is shown between simulations and KSTAR experiments in terms of time frequency and perpendicular wavevector spectrum.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466; AC05-00OR22725; FG02-07ER54916; SC0023434

OSTI ID:: 2496746

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 2 Vol. 65; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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