Investigation of ion and electron heat transport of high-Te ECH heated discharges in the large helical device

被引：8

作者：

Pablant, N. A. ^{[1
]}

Satake, S. ^{[2
,3
]}

Yokoyama, M. ^{[2
,3
]}

Gates, D. A. ^{[1
]}

Bitter, M. ^{[1
]}

Bertelli, N. ^{[1
]}

Delgado-Aparicio, L. ^{[1
]}

Dinklage, A. ^{[4
]}

Goto, M. ^{[2
]}

Hill, K. W. ^{[1
]}

Igamai, S. ^{[2
]}

Kubo, S. ^{[2
]}

Lazerson, S. ^{[1
]}

Matsuoka, S. ^{[5
]}

Mikkelsen, D. R. ^{[1
]}

Morita, S. ^{[2
,3
]}

Oishi, T. ^{[2
,3
]}

Seki, R. ^{[2
]}

Shimozuma, T. ^{[2
]}

Suzuki, C. ^{[2
]}

Suzuki, Y. ^{[2
,3
]}

Takahashi, H. ^{[2
]}

Yamada, H. ^{[2
,3
]}

Yoshimura, Y. ^{[2
]}

机构：

[1] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[2] Natl Inst Nat Sci, Natl Inst Fus Sci, 322-6 Oroshicho, Toki, Gifu 5095292, Japan

[3] SOKENDAI Grad Univ Adv Studies, Toki, Gifu 5095292, Japan

[4] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany

[5] Res Org Informat Sci & Technol, Kobe, Hyogo 6500047, Japan

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2016年 / 58卷 / 04期

关键词：

stellarator; transport; radial electric field; neoclassical; large helical device; x-ray imaging crystal spectrometer; core electron-root confinement; NEOCLASSICAL TRANSPORT; LHD; STELLARATOR; BARRIERS; PLASMAS; SYSTEM; POWER;

D O I：

10.1088/0741-3335/58/4/045004

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

An analysis of the radial electric field and heat transport, both for ions and electrons, is presented for a high-T-e electron cyclotron heated (ECH) discharge on the large helical device (LHD). Transport analysis is done using the task3d transport suite utilizing experimentally measured profiles for both ions and electrons. Ion temperature and perpendicular flow profiles are measured using the recently installed x-ray imaging crystal spectrometer diagnostic (XICS), while electron temperature and density profiles are measured using Thomson scattering. The analysis also includes calculated ECH power deposition profiles as determined through the travis ray-tracing code. This is the first time on LHD that this type of integrated transport analysis with measured ion temperature profiles has been performed without NBI, allowing the heat transport properties of plasmas with only ECH heating to be more clearly examined. For this study, a plasma discharge is chosen which develops a high central electron temperature (T-eo = 9 keV) at moderately low densities (n(eo) = 1.5 x 10(19) m(-3)). The experimentally determined transport properties from task3d are compared to neoclassical predictions as calculated by the gsrake and fortec-3d codes. The predicted electron fluxes are seen to be an order of magnitude less than the measured fluxes, indicating that electron transport is largely anomalous, while the neoclassical and measured ion heat fluxes are of the same magnitude. Neoclassical predictions of a strong positive ambipolar electric field (E-r) in the plasma core are validated through comparisons to perpendicular flow measurements from the XICS diagnostic. This provides confidence that the predictions are producing physically meaningful results for the particle fluxes and radial electric field, which are a key component in correctly predicting plasma confinement.

引用

页数：10

共 21 条

[21] Direct observation of the non-locality of non-diffusive counter-gradient electron thermal transport during the formation of hollow electron-temperature profiles in the Large Helical Device
Tsujimura, T. I.
Kobayashi, T.
Tanaka, K.
Ida, K.
Nagaoka, K.
Yoshinuma, M.
Yamada, I.
Funaba, H.
Seki, R.
Satake, S.
Kinoshita, T.
Tokuzawa, T.
Kenmochi, N.
Igami, H.
Mukai, K.
Goto, M.
Kawamoto, Y.
PHYSICS OF PLASMAS, 2022, 29 (03)

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