Tritium self-sufficiency in future deuterium-tritium fusion reactors is a crucial challenge.As an engineering test reactor,the China Fusion Engineering Test Reactor requires a burning fraction of 3％for the goal to test the accessibility to the future fusion plant.To self-consistently simulate burning plasmas with profile changes in pellet injection scenarios and to estimate the corresponding burning fraction,a one-dimensional multi-species radial transport model is developed in the BOUT++framework.Several pellet-fueling scenarios are then tested in the model.The results show that the increased fueling depth improves the burning fraction by particle confinement improvement and fusion power increase.Nevertheless,by increasing the depth,the pellet cooling-down may significantly lower the temperature in the core region.Taking the density perturbation into consideration,the reasonable parameters of the fueling scenario in these simulations are estimated as pellet radius rp=3 mm,injection rate=4 Hz,and pellet injection velocity=1000-2000 m s-1 without drift or 450 m s-1 with high-field-side drift.

Weisheng LIN;Xiaogang WANG;Xueqiao XU;Defeng KONG;Yumin WANG;Jiale CHEN;Zhanhui WANG;Chijie XIAO

State Key Lab of Nuclear Physics and Technology and School of Physics,Peking University,Beijing 100871,People's Republic of China;Department of Physics,Institute of Space Environment and Matter Science,Harbin Institute of Technology,Harbin 150001,People's Republic of China;Lawrence Livermore National Laboratory,Livermore,California 94551,United States of America;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,People's Republic of China;Southwestern Institute of Physics,Chengdu 610041,People's Republic of China

等离子体科学和技术（英文版）

[1]Weisheng LIN;Xiaogang WANG;Xueqiao XU;Defeng KONG;Yumin WANG;Jiale CHEN;Zhanhui WANG;Chijie XIAO-.Estimation of China Fusion Engineering Test Reactor performance and burning fraction in different pellet fueling scenarios by a multi-species radial transport model)[J].等离子体科学和技术（英文版）,2022(05):102-111

BOUT++framework

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