Collisionality dependence and ion species effects on heat transport in He and H plasma, and the role of ion scale turbulence in LHD

Tanaka, K.; Nagaoka, K.; Murakami, S.; Takahashi, H.; Osakabe, M.; Yokoyama, M.; Seki, R.; Michael, C. A.; Yamaguchi, H.; Suzuki, C.; Shimizu, A.; Tokuzawa, T.; Yoshinuma, M.; Akiyama, T.; Ida, K.; Yamada, I.; Yasuhara, R.; Funaba, H.; Kobayashi, T.; Yamada, H.; Du, X. D.; Vyacheslavov, L. N.; Mikkelsen, D. R.; Yun, G. S.

doi:10.1088/1741-4326/aa79c6

Title: Collisionality dependence and ion species effects on heat transport in He and H plasma, and the role of ion scale turbulence in LHD

Journal Article · Tue Aug 01 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa79c6· OSTI ID:1474420

Tanaka, K. ^[1]; Nagaoka, K. ^[2]; Murakami, S. ^[3]; Takahashi, H. ^[4]; Osakabe, M. ^[4]; Yokoyama, M. ^[4]; Seki, R. ^[4]; Michael, C. A. ^[5]; Yamaguchi, H. ^[6]; Suzuki, C. ^[6]; Shimizu, A. ^[6]; Tokuzawa, T. ^[6]; Yoshinuma, M. ^[4]; Akiyama, T. ^[6]; Ida, K. ^[4]; Yamada, I. ^[6]; Yasuhara, R. ^[6]; Funaba, H. ^[6]; Kobayashi, T. ^[4]; Yamada, H. ^[4] more »

National Inst. for Fusion Science (NIFS), Toki (Japan); Kyushu Univ. (Japan). Dept. of Advanced Energy Engineering
National Inst. for Fusion Science (NIFS), Toki (Japan); Nagoya Univ. (Japan). Graduate School of Science
Kyoto Univ. (Japan). Dept. of Nuclear Engineering
National Inst. for Fusion Science (NIFS), Toki (Japan); SOKENDAI, Toki (Japan). The Graduate Univ. for Advanced Studies
Australian National Univ., Canberra, ACT (Australia). Plasma Research Lab. and Research School of Physics and Engineering
National Inst. for Fusion Science (NIFS), Toki (Japan)
Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy
Russian Academy of Sciences (RAS), Novosibirsk (Russian Federation). Budker Inst. of Nuclear Physics (BINP); Novosibirsk State Univ. (Russian Federation)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Russian Academy of Sciences (RAS), Novosibirsk (Russian Federation). Budker Inst. of Nuclear Physics (BINP); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)

Here, surveys of the ion and electron heat transports of neutral beam (NB) heating plasma were carried out by power balance analysis in He and H rich plasma at LHD. Collisionality was scanned by changing density and heating power. The characteristics of the transport vary depending on collisionality. In low collisionality, with low density and high heating power, an ion internal transport barrier (ITB) was formed. The ion heat conductivity (χ_i) is lower than electron heat conductivity (χ_e) in the core region at ρ < 0.7. On the other hand, in high collisionality, with high density and low heating power, χ_i is higher than χ_e across the entire range of plasma. These different confinement regimes are associated with different fluctuation characteristics. In ion ITB, fluctuation has a peak at ρ = 0.7, and in normal confinement, fluctuation has a peak at ρ = 1.0. The two confinement modes change gradually depending on the collisionality. Scans of concentration ratio between He and H were also performed. The ion confinement improvements were investigated using gyro-Bohm normalization, taking account of the effective mass and charge. The concentration ratio affected the normalized χ_i only in the edge region (ρ ~ 1.0). This indicates ion species effects vary depending on collisionality. Turbulence was modulated by the fast ion loss instability. The modulation of turbulence is higher in H rich than in He rich plasma.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); National Inst. for Fusion Science (NIFS), Toki (Japan)

Sponsoring Organization:: USDOE

Contributing Organization:: the LHD Experimental Group

Grant/Contract Number:: NIFSULHH013; NIFS10ULRR702; NIFSULHH004; NFSULHH005; NIFSULHH02; NIFSULHH028; NIFS16KLER045; NIFS14UNTT006

OSTI ID:: 1474420

Journal Information:: Nuclear Fusion, Vol. 57, Issue 11; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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