Verification of neoclassical toroidal viscosity induced by energetic particles

Wang, Zhirui R.; Liu, Yueqiang; Logan, Nikolas C.; Chrystal, Colin; Munaretto, Stefano; Hu, Qiming; Liu, Tong; Park, Jong-Kyu

doi:10.1063/5.0096964

Title: Verification of neoclassical toroidal viscosity induced by energetic particles

Journal Article · Mon Oct 31 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0096964· OSTI ID:1899099

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Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Irvine, CA (United States)
Dalian Univ. of Technology (China)

The thermal particles contributed neoclassical toroidal viscosity (NTV) have been successfully developed and explored by many impressive works such as the study by Shaing et al. [Phys. Plasmas 10, 1443 (2003)] and Zhu et al. [Phys. Rev. Lett. 96, 225002 (2006)]. In this work, the scope of the NTV study is extended to explore the contribution of energetic particles (EPs) through both theory and experiments. In theory, the existence of the NTV torque due to the precessional drift resonance of trapped EPs is identified based on the equivalence between the NTV torque and the perturbed drift kinetic energy [J. Park, Phys. Plasmas 18, 110702 (2011)]. Toroidal modeling with the Magneto Resistive Spectrum - drift Kinetic code [Y. Liu, Phys. Plasmas 15, 112503 (2008)], based on this equivalence, indicates that trapped EPs can contribute a significant amount of the NTV torque. Meanwhile, this work also focuses on developing the dedicated DIII-D experiments in the presence of the n = 2 external magnetic perturbation to verify the EP induced NTV (EP-NTV) by measuring the change of the NTV torque while varying the angle and the voltage of the neutral beam injection. However, the developed experiments have been unable to create conditions necessary to clearly demonstrate the presence of EP-NTV. The main challenge is separating the resonant and non-resonant momentum transport responses in the plasma. Finally, the experience, gained from this study, can help the further exploration of EP-NTV in the future experiments.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: FC02-04ER54698; AC02-09CH11466; FG02-95ER54309; AC52-07NA27344

OSTI ID:: 1899099

Alternate ID(s):: OSTI ID: 1895533; OSTI ID: 1959413

Report Number(s):: LLNL-JRNL-835142; TRN: US2310957

Journal Information:: Physics of Plasmas, Vol. 29, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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