PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Energetic Particle Transport Prediction for CFETR Steady State Scenario Based on Critical Gradient Model |
Yunpeng Zou1, V. S. Chan2,3, Wei Chen1*, Yongqin Wang1, Yumei Hou1, and Yiren Zhu1 |
1Southwestern Institute of Physics, Chengdu 610041, China 2General Atomics, San Diego, CA 92186, USA 3School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230026, China
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Cite this article: |
Yunpeng Zou, V. S. Chan, Wei Chen et al 2021 Chin. Phys. Lett. 38 045203 |
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Abstract The critical gradient mode (CGM) is employed to predict the energetic particle (EP) transport induced by the Alfvén eigenmode (AE). To improve the model, the normalized critical density gradient is set as an inverse proportional function of energetic particle density; consequently, the threshold evolves during EP transport. Moreover, in order to consider the EP orbit loss mechanism in CGM, ORBIT code is employed to calculate the EP loss cone in phase space. With these improvements, the AE enhances EPs radial transport, pushing the particles into the loss cone. The combination of the two mechanisms raises the lost fraction to 6.6%, which is higher than the linear superposition of the two mechanisms. However, the loss is still far lower than that observed in current experiments. Avoiding significant overlap between the AE unstable region and the loss cone is a key factor in minimizing EP loss.
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Received: 01 December 2020
Published: 06 April 2021
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PACS: |
52.25.Fi
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(Transport properties)
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52.35.Bj
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(Magnetohydrodynamic waves (e.g., Alfven waves))
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52.65.Cc
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(Particle orbit and trajectory)
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52.65.Ff
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(Fokker-Planck and Vlasov equation)
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Fund: Supported by the National Key R&D Program of China (Grant No. 2019TFE03020000), the National Natural Science Foundation of China (Grant Nos. 11875021, 12005054, and 12005055), the Sichuan Science and Technology Program (Grant No. 2020jqqn0070). |
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