Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D

Li, Zeyu; Chen, Xi; Muscatello, C. M.; Burrell, K. H.; Xu, Xueqiao; Zhu, Ben; Hong, Rongjie; Osborne, T. H.; Grierson, B. A.; Rhodes, T. L.; Xia, T. Y.; McKee, G. R.; Yan, Z.; Yu, Guanying

doi:10.1088/1741-4326/ac4acf

Title: Numerical modeling of pedestal stability and broadband turbulence of wide-pedestal QH-mode plasmas on DIII-D

Journal Article · Thu May 05 00:00:00 EDT 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac4acf· OSTI ID:1959677

^[1];

^[2];

^[2]; Burrell, K. H. ^[2]; Xu, Xueqiao ^[3];

^[3];

^[4]; Osborne, T. H. ^[2];

^[5]; Rhodes, T. L. ^[4]; Xia, T. Y. ^[6];

^[7]; Yan, Z. ^[7];

^[8]

Oak Ridge Associated Univ., Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Los Angeles, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Chinese Academy of Sciences, Hefei (China)
Univ. of Wisconsin, Madison, WI (United States)
Univ. of California, Davis, CA (United States)

The wide-pedestal quiescent high confinement mode discovered on DIII-D in recent years is a stationary and quiescent H-mode (QH-mode) with the pedestal width exceeding EPED prediction by at least 25%. Its characteristics, such as low rotation, high energy confinement and edge localized mode-free operation, make it an attractive operation mode for future reactors. Linear and nonlinear simulations using BOUT++ reduced two fluid MHD models and awere carried out to investigate the bursty broadband turbulence often observed in the edge of wide-pedestal QH-mode plasmas. Two kinds of MHD-scale instabilities in different spatial locations within the pedestal were found in the simulations: one mild peeling–ballooning (PB) mode γ _PB < 0.04ω _A) located near the minimum in E _{r well propagating in ion diamagnetic drift direction; and one drift-Alfvén wave locates at smaller radius compared to E _{r well propagating in the electron diamagnetic drift direction and unstable only when the parallel electron dynamics is included in the simulation. The coupling between drift wave and shear Alfvén wave provides a possible cause of the experimentally observed local profile flattening in the upper-pedestal. The rotation direction, mode location, as well as the wavenumber of these two modes from BOUT++ simulations agree reasonably well with the experimental measurements, while the lack of quantitative agreement is likely due to the lack of trapped electron physics in current fluid model. This work presents improved physics understanding of the pedestal stability and turbulence dynamics for wide-pedestal QH-mode.}}

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Contributing Organization:: DIII-D Team

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; FC02-04ER54698; SC0017992; SC0019352; AC02-09CH11466; FG02-08ER54999; FG02-99ER54531

OSTI ID:: 1959677

Alternate ID(s):: OSTI ID: 1866601

Report Number(s):: LLNL-JRNL-829769; 1045949; TRN: US2312905

Journal Information:: Nuclear Fusion, Vol. 62, Issue 7; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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