Effects of radial transport on divertor power and particle flux widths under different operational regimes in EAST

Deng, G. Z.; Xu, X. Q.; Liu, X. J.; Xu, J. C.; Meng, L. Y.; Liu, J. B.; Li, N. M.; Schmitz, L.; Gao, S. L.; Yang, Q. Q.; Ye, Y.; Xia, T. Y.; Liu, S. C.; Ming, T. F.; Xu, G. S.; Lin, X. D.; Li, G. Q.; Gao, X.; Wang, L.

doi:10.1088/1741-4326/ac1546

Title: Effects of radial transport on divertor power and particle flux widths under different operational regimes in EAST

Journal Article · 07 September 2021 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ac1546 · OSTI ID:1830467

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Shenzhen Univ. (China); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Dalian Univ. of Technology (China)
Univ. of California, Los Angeles, CA (United States)
Shenzhen Univ. (China)

Here, a study of the effects of radial transport on the outer divertor particle and power flux widths (λ_js and λ_q) is carried out using plasmas under different operational regimes in the Experimental Advanced Superconducting Tokamak (EAST). In the EAST experiments, the λ_js values measured during the grassy intra- and inter-ELM phases are similar, and the averaged value of λ_js during grassy ELMy discharges is found to be smaller than that of the intra-ELM phase of type-I ELMy discharges but larger than that of the inter-ELM phase of type-I ELMy discharges. Simulations of scans of the radial particle and heat transport coefficients, D and χ_e, performed using the BOUT++ transport code show that both λq and λjs increase with D and χe, especially when D or χ_e is larger than a threshold value, indicating that background turbulence starts to matter in the determination of λ_q and λ_js when D or χ_e surpasses the threshold value. A comparison between the simulation of the D scan and the experimental results shows that the different values of λ_js obtained under different plasma operational regimes are probably due to the different intensities of background turbulence, which is beyond the scope of Goldston's heuristic drift-based model as reported by Goldston et al (2012 Nucl. Fusion 52 013009), since their model was derived by assuming that turbulent transport does not exceed a certain level. The ratio of λ_js to λ_q is greatly affected by the radial transport; however, simulations carried out using Scrape-off Layer Plasma Simulation (SOLPS) show that divertor geometry and plasma density have big influences on λ_js, and thus could also affect the ratio of λ_js to λ_q.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: AHNFS; China Scholarship Council; National Key R&D Program of China; National Natural Science Foundation of China (NSFC); Shenzhen Clean Energy Research Institute; USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1830467

Report Number(s):: LLNL-JRNL--790439; LLNL-JRNL--829235; 1045093

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 10 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Effects of radial transport on divertor power and particle flux widths under different operational regimes in EAST

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