Isotope effects on transport in LHD

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

doi:10.1088/1361-6587/abffb6

Isotope effects on transport in LHD

Journal Article · 26 July 2021 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/abffb6· OSTI ID:1852749

; ; ; Yamada, H.; Kobayashi, T.; ; ; ; ; Tokuzawa, T.; Takahashi, H.; Warmer, F.; Mukai, K.; Murakami, S.; Sakamoto, R.; Nakano, H.; Osakabe, M.; ; Nunami, M.; Tala, T. more »

Abstract

Isotope effects are one of the most important issues for predicting future reactor operations. Large helical device (LHD) is the presently working largest stellarator/helical device using super conducting helical coils. In LHD, deuterium experiments started in 2017. Extensive studies regarding isotope effects on transport have been carried out. In this paper, the results of isotope effect studies in LHD are reported. The systematic studies were performed adjusting operational parameters and nondimensional parameters. In L mode like normal confinement plasma, where internal and edge transport barriers are not formed, the scaling of global energy confinement time (τ_E) with operational parameters shows positive mass dependence (M^0.27; whereMis effective ion mass) in electron cyclotron heating plasma and no mass dependence (M^0.0) in neutral beam injection heating plasma. The non-negative ion mass dependence is anti-gyro-Bohm scaling. The role of the turbulence in isotope effects was also found by turbulence measurements and gyrokinetic simulation. Better accessibility to electron and ion internal transport barrier (ITB) plasma is found in deuterium (D) plasma than in hydrogen (H). Gyro kinetic non-linear simulation shows reduced ion heat flux due to the larger generation of zonal flow in deuterium plasma. Peaked carbon density profile plays a prominent role in reducing ion energy transport in ITB plasma. This is evident only in plasma with deuterium ions. New findings on the mixing and non-mixing states of D and H particle transports are reported. In the mixing state, ion particle diffusivities are higher than electron particle diffusivities and D and H ion density profiles are almost identical. In the non-mixing state, ion particle diffusivity is much lower than electron diffusivity. Deuterium and hydrogen ion profiles are clearly different. Different turbulence structures were found in the mixing and non-mixing states suggesting different turbulence modes play a role.

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0019007

OSTI ID:: 1852749

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 63, Issue 9; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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