Extended investigations of isotope effects on ECRH plasma in LHD

T. Morisaki, K. Tanaka, M. Nakata, Y. Ohtani, T. Tokuzawa, H. Yamada, F. Warmer, M. Nunami, S. Satake, T. Tala, T. Tsujimura, Y. Takemura, T. Kinoshita, H. Takahashi, M. Yokoyama, R. Seki, H. Igami, Y. Yoshimura, S. Kubo, T. ShimozumaT. Akiyama, I. Yamada, R. Yasuhara, H. Funaba, M. Yoshinuma, K. Ida, M. Goto, G. Motojima, M. Shoji, S. Masuzaki, C. A. Michael, L. N. Vacheslavov, M. Osakabe, T. Morisaki

Результат исследования: Научные публикации в периодических изданияхстатья

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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.

Язык оригиналаанглийский
Номер статьи024006
Число страниц18
ЖурналPlasma Physics and Controlled Fusion
Номер выпуска2
СостояниеОпубликовано - 1 янв 2020

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    Morisaki, T., 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., ... Morisaki, T. (2020). Extended investigations of isotope effects on ECRH plasma in LHD. Plasma Physics and Controlled Fusion, 62(2), [024006]. https://doi.org/10.1088/1361-6587/ab5bae