Study of up–down poloidal density asymmetry of high- $\mathrm{Z}$ impurities with the new impurity version of XGCa

Dominski, J.; Chang, C. S.; Hager, R.; Helander, P.; Ku, S.; Yoon, E. S.

doi:10.1017/S0022377819000722

Title: Study of up–down poloidal density asymmetry of high- $$\mathrm{Z}$$ impurities with the new impurity version of XGCa

Journal Article · Thu Oct 17 00:00:00 EDT 2019 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/S0022377819000722· OSTI ID:1573501

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^[1]; Yoon, E. S. ^[3]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Max-Planck-Inst. für Plasmaphysik, Greifswald (Germany)
Ulsan National Inst. of Science and Technology, Ulsan (Korea, Republic of)

Addition of multispecies impurity ions to the total-f gyrokinetic particle-in-cell code XGCa is reported, including a cross-verification of neoclassical physics against the NEO code. This new version of the neoclassical gyrokinetic code XGCa is used to benchmark and confirm the previous reduced-equation-based prediction that high- $$\mathrm{Z}$$ impurity particles in the Pfirsch–Schlüter regime can exhibit a significant level of up–down poloidal asymmetry, through the large parallel friction force, and thus influence the radial plasma transport significantly. The study is performed in a plasma with weak toroidal rotation. In comparison, when the impurity particles are in the plateau regime, the up–down poloidal asymmetry becomes weak, with the parallel friction force becoming weaker than the parallel viscous force. It is also found that the linearization of the perturbed distribution function, based on the small poloidal asymmetry assumption, can become invalid. Finally, using the numerical data from XGCa, each term in the parallel fluid force-balance equation have been analysed to find that both the main ions and the electrons respond to the poloidal potential variation adiabatically when the high- $$\mathrm{Z}$$ tungsten possesses large poloidal variation.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-05CH11231; AC02-09CH11466

OSTI ID:: 1573501

Journal Information:: Journal of Plasma Physics, Vol. 85, Issue 5; ISSN 0022-3778

Publisher:: Cambridge University PressCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Cited By (1)

Cross-verification of neoclassical transport solutions from XGCa against NEO Hager, R.; Dominski, J.; Chang, C. S. Physics of Plasmas, Vol. 26, Issue 10 https://doi.org/10.1063/1.5121308	journal	October 2019