Energetic particle transport and loss induced by helically-trapped energetic-ion-driven resistive interchange modes in the Large Helical Device

Ogawa, K.; Isobe, M.; Sugiyama, S.; Matsuura, H.; Spong, Donald A.; Nuga, H.; Seki, R.; Kamio, S.; Fujiwara, Y.; Yamaguchi, H.; Osakabe, M.

doi:10.1088/1741-4326/ab6da0

Title: Energetic particle transport and loss induced by helically-trapped energetic-ion-driven resistive interchange modes in the Large Helical Device

Journal Article · Thu Aug 27 00:00:00 EDT 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab6da0· OSTI ID:1797655

^[1]; Isobe, M. ^[1];

^[2]; Matsuura, H. ^[2];

^[3]; Nuga, H. ^[4]; Seki, R. ^[1]; Kamio, S. ^[4];

^[4]; Yamaguchi, H. ^[4]; Osakabe, M. ^[1]

National Institutes of Natural Sciences, Toki (Japan). National Institute for Fusion Science; The Graduate University for Advanced Studies (SOKENDAI), Toki (Japan)
Kyushu Univ., Fukuoka (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
National Institutes of Natural Sciences, Toki (Japan). National Institute for Fusion Science

Here, energetic-ion confinement and loss due to energetic-ion driven magnetohydrodynamic modes are studied using comprehensive neutron diagnostics and orbit-following numerical simulations for the Large Helical Device (LHD). The neutron flux monitor is employed in order to obtain global confinement of energetic ions and two installed vertical neutron cameras (VNCs) viewing different poloidal cross-sections are utilized in order to measure the radial profile of energetic ions. A strong helically-trapped energetic-ion-driven resistive interchange mode (EIC) excited in relatively low-density plasma terminated high-temperature state in LHD. Changes in the neutron emission profile due to the EIC excitation are clearly visualized by the VNCs. The reduction in the neutron signal for the helical ripple valley increases with EIC amplitude, which reaches approximately 50%. In addition to the EIC experiment, orbit-following simulations using the DELTA5D code with EIC fluctuations were performed to assess the energetic-ion transport and loss. Two-dimensional temporal evolution results show that the neutron emissivity at the helical ripple decreases significantly due to the EIC. The rapid reduction in neutron emissivity shows that the helically-trapped beam ions immediately escape from the plasma. The reduction in the VNC signals for the helical ripple valley and the total neutron emission rate increase with increasing EIC amplitude, as observed in the experiment. Calculated line-integrated neutron emission results show that the profile measured by VNC1 has one peak, whereas the profile measured by VNC2 has two peaks, as observed in the experiment. Although the neutron emission profile for VNC2 has a relatively wide peak compared with the experimental results, the significant decrease in neutron signal corresponding to the helical ripple valley was successfully reproduced.

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

Sponsoring Organization:: USDOE; National Institute for Fusion Science (NIFS) of Japan; Japan Society for the Promotion of Science (JSPS)

Contributing Organization:: LHD Experiment Group

Grant/Contract Number:: AC05-00OR22725; KOAH037; ULHH003; ULHH034; ULGG801; C19K03798; 01411702

OSTI ID:: 1797655

Journal Information:: Nuclear Fusion, Vol. 60, Issue 11; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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