Extended investigations of isotope effects on ECRH plasma in LHD
| Autor: | Mamoru Shoji, Katsumi Ida, Ryosuke Seki, Gen Motojima, Ichihiro Yamada, Masanori Nunami, S. Satake, Hiroto Takahashi, Hisamichi Funaba, Masayuki Yokoyama, Tuomas Tala, Hiroshi Yamada, Clive Michael, Suguru Masuzaki, Shin Kubo, L. N. Vacheslavov, Y. Ohtani, Motoki Nakata, Masaki Osakabe, Tomohiro Morisaki, Tokihiko Tokuzawa, Kenji Tanaka, Toru Ii Tsujimura, Motoshi Goto, Ryo Yasuhara, Yasuo Yoshimura, Mikiro Yoshinuma, Felix Warmer, Y. Takemura, Tsuyoshi Akiyama, Hiroe Igami, Toshiki Kinoshita, Takashi Shimozuma |
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| Přispěvatelé: | LHD Experiment Group |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Density gradient Electron Collisionality 01 natural sciences Instability 010305 fluids & plasmas law.invention Ion stellarator law Physics::Plasma Physics particle transport 0103 physical sciences Diffusion (business) 010306 general physics energy transport turbulence Plasma Condensed Matter Physics Nuclear Energy and Engineering Physics::Space Physics Atomic physics Stellarator isotope effect |
| Zdroj: | Plasma Physics and Controlled Fusion Citation K Tanaka et al 2020 Plasma Phys. Control. Fusion 62 024006 Tanaka, K, Nakata, M, Ohtani, Y, Tokuzawa, T, Yamada, H, Warmer, F, Nunami, M, Satake, S, Tala, T, Tsujimura, T, Takemura, Y, Kinoshita, T, Takahashi, H, Yokoyama, M, Seki, R, Igami, H, Yoshimura, Y, Kubo, S, Shimozuma, T, Akiyama, T, Yamada, I, Yasuhara, R, Funaba, H, Yoshinuma, M, Ida, K, Goto, M, Motojima, G, Shoji, M, Masuzaki, S, Michael, C A, Vacheslavov, L N, Osakabe, M, Morisaki, T & LHD experiment group 2020, ' Extended investigations of isotope effects on ECRH plasma in LHD ', Plasma Physics and Controlled Fusion, vol. 62, no. 2, 024006 . https://doi.org/10.1088/1361-6587/ab5bae |
| DOI: | 10.1088/1361-6587/ab5bae |
| Popis: | Isotope effects of ECRH plasma in LHD were investigated in detail. A clear difference of transport and turbulence characteristics in H and D plasmas was found in the core region, with normalized radius ρ < 0.8 in high collisionality regime. On the other hand, differences of transport and turbulence were relatively small in low collisionality regime. Power balance analysis and neoclassical calculation showed a reduction of the anomalous contribution to electron and ion transport in D plasma compared with H plasma in the high collisionality regime. In core region, density modulation experiments also showed more reduced particle diffusion in D plasma than in H plasma, in the high collisionality regime. Ion scale turbulence was clearly reduced at ρ < 0.8 in high collisionality regime in D plasma compared with H plasma. The gyrokinetic linear analyses showed that the dominant instability ρ = 0.5 and 0.8 were ion temperature gradient mode (ITG). The linear growth rate of ITG was reduced in D plasma than in H plasma in high collisionality regime. This is due to the lower normalized ITG and density gradient. More hollowed density profile in D plasma is likely to be the key control parameter. Present analyses suggest that anomalous process play a role to make hollower density profiles in D plasma rather than neoclassical process. Electron scale turbulence were also investigated from the measurements and linear gyrokinetic simulations. |
| Databáze: | OpenAIRE |
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