UEDGE modeling of plasma detachment of CFETR with ITER-like divertor geometry by external impurity seeding

IF 1.3 4区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Contributions to Plasma Physics Pub Date : 2024-01-05 DOI:10.1002/ctpp.202300135
M. Z. Zhang, C. F. Sang, M. L. Zhao, T. D. Rognlien, C. Zhang, Y. L. Wang, Y. Bian, Y. Wang
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Abstract

Efficient handling of high heat flux on the plasma-facing components, particularly the divertor targets, poses a significant challenge for the Chinese Fusion Engineering Testing Reactor (CFETR) with fusion power of Gigawatt. This work investigates the divertor plasma detachment of CFETR with a standard ITER-like divertor geometry by neon (Ne) or argon (Ar) impurity seeding using UEDGE code. The cross-field drifts terms are switched off, and fluid neutral models and a “fixed-fraction” impurity model are applied to enable efficient simulations for the study of CFETR detachment. In order to reduce the heat load on the divertor targets below the acceptable level (<10 MW/m2), the impurity fraction (f), pumping speed (S), and upstream density are varied to identify the suitable operations window during Ne seeding. The effects of Ne and Ar impurities on the plasma detachment are compared. It is found that with the power across the core-edge interface PSOL = 200 MW and separatrix density of 2.8  × $$ \times $$  1019 m 3 $$ {\mathrm{m}}^{-3} $$ , Ne impurity fraction ≥1.7%, and Ar impurity fraction ≥0.24% can achieve the partial detachment. Achieving similar total radiation power (˜148 MW), the Ne fraction is 2.3% and the Ar fraction is 0.24%. Moreover, the simulation results indicate that Ar exhibits better power radiation efficiency and core compatibility compared with Ne.

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通过外部杂质播种对具有类似于热核聚变实验堆分流器几何形状的 CFETR 的等离子体脱离进行 UEDGE 建模
如何有效处理面向等离子体部件(尤其是岔流靶)的高热流量,是中国聚变工程试验堆(CFETR)(聚变功率为千兆瓦)面临的一项重大挑战。这项工作利用 UEDGE 代码研究了 CFETR 的岔流器等离子体脱离情况,该岔流器采用标准的类似 ITER 的岔流器几何形状,通过氖(Ne)或氩(Ar)杂质播种。关闭了跨场漂移项,并应用了流体中性模型和 "固定比例 "杂质模型,以实现对 CFETR 脱离研究的高效模拟。为了将分流器目标上的热负荷降至可接受水平(<10 MW/m2)以下,改变了杂质分数(f)、泵送速度(S)和上游密度,以确定氖种子播种期间的合适操作窗口。比较了 Ne 和 Ar 杂质对等离子体脱离的影响。结果表明,在穿过核心-边缘界面的功率 PSOL = 200 MW 和分离矩阵密度为 2.8 1019 时,Ne 杂质分数≥1.7% 和 Ar 杂质分数≥0.24% 可以实现部分脱离。在总辐射功率(˜148 MW)相近的情况下,Ne 的杂质分数为 2.3%,Ar 的杂质分数为 0.24%。此外,模拟结果表明,与 Ne 相比,Ar 具有更好的功率辐射效率和堆芯兼容性。
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来源期刊
Contributions to Plasma Physics
Contributions to Plasma Physics 物理-物理:流体与等离子体
CiteScore
2.90
自引率
12.50%
发文量
110
审稿时长
4-8 weeks
期刊介绍: Aims and Scope of Contributions to Plasma Physics: Basic physics of low-temperature plasmas; Strongly correlated non-ideal plasmas; Dusty Plasmas; Plasma discharges - microplasmas, reactive, and atmospheric pressure plasmas; Plasma diagnostics; Plasma-surface interaction; Plasma technology; Plasma medicine.
期刊最新文献
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