Comprehensive magnetohydrodynamic hybrid simulations of Alfvén eigenmode bursts and fast-ion losses in the Large Helical Device

Seki, Ryosuke; Todo, Yasushi; Suzuki, Y.; Spong, Donald A.; Ogawa, K.; Isobe, M.; Osakabe, M.

doi:10.1088/1741-4326/ab266e

Title: Comprehensive magnetohydrodynamic hybrid simulations of Alfvén eigenmode bursts and fast-ion losses in the Large Helical Device

Journal Article · 23 July 2019 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ab266e · OSTI ID:1648934

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National Inst. of Natural Sciences (NINS), Toki (Japan). National Inst. for Fusion Science; SOKENDAI, Toki (Japan)
National Inst. of Natural Sciences (NINS), Toki (Japan). National Inst. for Fusion Science
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Comprehensive magnetohydrodynamic (MHD) hybrid simulations with neutral beam injection and collisions were conducted to investigate the Alfvén eigenmode (AE) bursts and the fast-ion losses in the large helical device (LHD) for the realistic conditions close to the experiments. In this study, it is found in the simulation of the slowing-down time scale that the AE bursts take place repetitively accompanied by fast-ion redistribution and losses leading to lower saturation levels of stored fast-ion energy than those in a classical calculation where the MHD perturbations are neglected. The fast-ion loss rate caused by the AE burst has the quadratic dependence on AE amplitude, which was observed in the LHD experiment. The majority of the lost fast ions are counter-passing particles whose velocity and pitch-angle are close to those of the beam injection. The second component of the lost fast ions is transit particles whose velocity is close to thermal velocity. The loss of the counter-passing particles occurs mainly during the AE bursts, while the transit particles are lost both during the AE bursts and the quiescent periods with larger loss rate than that in the classical calculation. The initial location of the lost counter-injected particles spreads from the plasma edge to the plasma center, while only the particles initially located in the peripheral region are lost for the co-injected beam.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; National Inst. for Fusion Science (NIFS) (Japan); Inst. of Physical and Chemical Research (RIKEN) (Japan); MEXT (Japan)

Grant/Contract Number:: AC05-00OR22725; NIFS16KNSR005; NIFS16KNXN325

OSTI ID:: 1648934

Journal Information:: Nuclear Fusion, Vol. 59, Issue 9; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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