Global gyrokinetic simulations of electrostatic microturbulent transport in LHD stellarator with boron impurity

Singh, Tajinder; Nicolau, Javier H.; Nespoli, Federico; Motojima, Gen; Lin, Zhihong; Sen, Abhijit; Sharma, Sarveshwar; Kuley, Animesh

doi:10.1088/1741-4326/ad0aca

Title: Global gyrokinetic simulations of electrostatic microturbulent transport in LHD stellarator with boron impurity

Journal Article · 17 November 2023 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ad0aca · OSTI ID:2216981

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Indian Institute of Science, Bangalore (India)
Univ. of California, Irvine, CA (United States)
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
National Institute of Natural Sciences (NINS), Toki (Japan). National Institute for Fusion Science
Institute for Plasma Research, Bhat (India); Homi Bhabha National Institute, Mumbai (India)

Global gyrokinetic simulations of electrostatic microturbulent transport for discharge # 166256 of the Large Helical Device stellarator in the presence of boron impurity show the co-existence of the ion temperature gradient (ITG) turbulence and trapped electron mode (TEM) turbulence before and during boron powder injection. ITG turbulence dominates in the core, whereas TEM dominates near the edge, consistent with the experimental observations. Linear TEM frequency increases from ~80 kHz to ~100 kHz during boron injection, and ITG frequency decreases from ~20 kHz to ~13 kHz, consistent with the experiments. The poloidal wave number spectrum is broad for both ITG (0–0.5 mm^-1) and TEM (0–0.25 mm^-1). The nonlinear simulations with boron impurity show a reduction in the heat conductivity compared to the case without boron. The comparison of the nonlinear transport before and during boron injection shows that the ion heat transport is substantially reduced in the region where the TEM is dominant. However, the average electron heat transport throughout the radial domain and the average ion heat transport in the region where the ITG is dominant are similar. The simulations with boron show the effective heat conductivity values qualitatively agree with the estimate obtained from the experiment.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; SC0022131; FG02-07ER54916; SciDAC ISEP: DE-SC0018270; EEQ/2022/000144

OSTI ID:: 2216981

Alternate ID(s):: OSTI ID: 2205133; OSTI ID: 2248054

Journal Information:: Nuclear Fusion, Vol. 64, Issue 1; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Global gyrokinetic simulations of electrostatic microturbulent transport in LHD stellarator with boron impurity

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