Evaluating the effects of tungsten on CFETR phase I performance

An integrated modeling workflow using OMFIT is constructed to evaluate the effects of tungsten (W) impurity on China Fusion Engineering Test Reactor (CFETR) performance. Self-consistent modeling of W core density profile, accounting for both turbulent and neoclassical transport contributions, is per...

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Bibliographic Details
Published in:Nuclear fusion 2018-10, Vol.58 (12), p.126020
Main Authors: Shi, Shengyu, Jian, Xiang, Chan, Vincent S., Gao, Xiang, Liu, Xiaoju, Shi, Nan, Chen, Jiale, Liu, Li, Wu, Muquan, Zhu, Yiren
Format: Article
Language:English
Subjects:
CFETR
fusion performance
integrated modeling
Physics
tungsten transport
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Summary:An integrated modeling workflow using OMFIT is constructed to evaluate the effects of tungsten (W) impurity on China Fusion Engineering Test Reactor (CFETR) performance. Self-consistent modeling of W core density profile, accounting for both turbulent and neoclassical transport contributions, is performed based on the steady-state scenario of CFETR phase I (Wan et al 2016 IAEA; Wan et al 2017 Nucl. Fusion 57 102009). It is found that the fusion performance degrades mildly with increasing W concentration. The main challenge arises in the sustainment of H-mode operation with significant W radiation. Assuming that the power threshold of H-L back transition is approximately the same as that of L-H transition, the W fraction at the plasma boundary is not allowed to exceed to stay in H-mode for CFETR phase I according to the scaling law proposed by Takizuka et al (2004 Plasma Phys. Control Fusion 46 A227-33). In addition, the tolerance of W concentration decreases with increasing pedestal density through a trade-off study of pedestal density and temperature. A future step is to connect the core simulation to W wall erosion modeling.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/aae397