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Response of thermal and fast-ion transport to beam ion population, rotation and T e/T i in the DIII-D steady state hybrid scenario

DIII-D公司 中性束注入 物理 原子物理学 电子 离子 等离子体 人口 温度电子 稳态(化学) 回旋加速器 托卡马克 核物理学 化学 人口学 物理化学 量子力学 社会学
作者
K. E. Thome,Xiaodi Du,B. A. Grierson,G. J. Kramer,C. C. Petty,C. Holland,M. Knölker,G. R. McKee,J. McClenaghan,D. C. Pace,T. L. Rhodes,S. P. Smith,C. Sung,F. Turco,M. A. Van Zeeland,L. Zeng,Y. B. Zhu
出处
期刊:Nuclear Fusion [IOP Publishing]
卷期号:61 (3): 036036-036036 被引量:4
标识
DOI:10.1088/1741-4326/abd862
摘要

Abstract The thermal and fast-ion transport properties of DIII-D steady-state hybrid discharges with normalized beta β N ≳ 3 are studied at low injected torque and an increased electron to ion temperature ratio T e / T i . Linear stability analysis performed with the TGLF turbulent code indicates that a high- k mode is usually dominant at smaller radii, whereas a low- k mode is usually dominant at larger radii in these plasmas. A reduction in the net injected torque from 8.6 to 4.3 N-m leads to reduced E × B shear and hence, an enhanced turbulence that was observed on the Doppler backscattering diagnostic and was also computed with TGLF. As T e / T i in the core was increased from 0.57 to 0.66 by adding electron cyclotron current drive (ECCD) to these plasmas, higher levels of transport are observed with increased high- k modes indicated by TGLF. The fast-ion transport level varied over an order of magnitude in these discharges depending on whether Alfvén eigenmodes, fishbones, or no instabilities were observed. Hybrid plasmas with fishbones have decreased fast-ion transport, compared to plasmas with Alfvén eigenmodes, since they are resonant with a smaller portion of phase space and their resonance is farther from the wall. This reduction in fast-ion transport with ECCD mitigates the increase in turbulent transport, resulting in higher performance than expected during strong electron heating. Similarly, the lowest fast-ion transport was observed in the low torque plasma, which also led to better than expected performance at this torque value. The thermal and fast-ion transport changes observed as the torque/rotation and T e / T i are varied indicate possible methods for transferring this scenario to a reactor.
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