Isotope effects under the influence of global radial electric fields in a helical configuration

Moritaka, Toseo; Sugama, Hideo; Cole, Michael D. J.; Hager, Robert; Ku, Seung -Hoe; Chang, Choong -Seock; Ishiguro, Seiji

doi:10.1088/1741-4326/ac95ab

Isotope effects under the influence of global radial electric fields in a helical configuration

Journal Article · Mon Nov 07 04:00:00 EST 2022 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ac95ab· OSTI ID:1905783

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National Institute for Fusion Science, Toki (Japan); Graduate University for Advanced Studies (SOKENDAI), Toki (Japan)
National Institute for Fusion Science, Toki (Japan); Univ. of Tokyo (Japan)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
National Institute for Fusion Science, Toki (Japan)

Isotope effects under the influence of a radial electric field are examined in a helical magnetic field configuration. We perform global gyrokinetic simulations with additional poloidal rotations to estimate quasi-linear heat flux due to ion temperature gradient mode under the mixing length model. In single-ion-species plasmas, the mass number dependency of heat flux agrees with gyro-Bohm scaling in the absence of a radial electric field. Favorable mass number dependencies violating gyro-Bohm scaling are observed in the presence of a global radial electric field or a heavy hydrogen component in multi-ion-species plasmas. The radial electric field and the heavy hydrogen component affect the heat flux through an increase of wavelength as well as mode stabilization. Poloidal Mach number characterizes the transition from unfavorable to favorable mass number dependency under radial electric fields. While the heat flux is independent of mass number for a given poloidal Mach number, the heat flux decreases for higher mass numbers in a given radial electric field. The heat flux is also independent of average mass number in multi-ion-species plasmas because the heavy hydrogen component effectively enhances the light hydrogen heat flux. The present results are potentially relevant to the violation of gyro-Bohm scaling observed in the recent deuterium experiments in the Large Helical Device.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE; Japan Society for the Promotion of Science (JSPS) (KAKENHI); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Institute of Natural Science (NINS)

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1905783

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 62; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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