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磁约束托卡马克装置等离子体物理参数, 如等离子体电流、约束磁场、安全因子的实时监测对高约束模式(H模)的稳态运行至关重要. 本文介绍了基于HL-2A实验数据和集成建模手段, 重建先进高约束运行模式(H模)下等离子体位形, 电流密度和安全因子参数剖面. 通过搭建动力学平衡位形集成模拟平台, 结合工作流快速处理手段, 采用真实实验数据和集成模拟模型, 得到了HL-2A高约束模式放电条件的离子和电子温度、密度, 电流密度和安全因子q剖面, 重建了高约束模式放电物理图像和托卡马克内部磁面位形和等离子体边界参数连续分布, 计算了等离子体欧姆电流、自举电流和射频电流等剖面及各自份额, 给出了先进运行模式下安全因子q径向分布. 通过集成模拟, 发现HL-2A该炮号参数条件下台基宽度约7.52 cm, 压强梯度的方向在
ρ(r/a) = 0.1改变, 在ρ = 0.7附近数值达到最大, 可能是负剪切产生的内部输运垒位形(ITB)引起的. 通过等离子体磁场和电流等剖面重建和实时监测, 可以评估HL-2A高约束放电实验的品质, 为HL-2M高比压（βn）先进模式的稳态运行提供参考. The plasma current (Ip), magnetic field (B), and safety factor distribution (q profile) of the HL-2A tokamak device are crucial to monitoring the steady-state operational scenarios (in high confinement mode, H mode). Based on real experimental data and integrated modeling simulation method (OMFIT), the plasma parameters’ profiles such as magnetic field configuration and current density profiles in H mode were reconstructed. By building up an integrated simulation platform for dynamic equilibrium configuration, and combining the rapid workflow processing method and experimental data with integrated simulation models, the ion and electron temperature, density, and current density profiles were obtained. The integration simulation platform was established to reconstruct the internal magnetic surface configuration, the plasma boundary parameter distribution, the ion/electron temperature, current density, and the q profile. The Ohmic current, bootstrap current, and radio-frequency current profiles with its fractions were calculated. The width of the pedestal region was about 7.52 cm according to our simulation results. It was found that the pressure gradient changes its direction at radial coordinate ρ(r/a) = 0.1 and reaches its maximum value near ρ = 0.7, which may be the internal transport barrier (ITB) configuration caused by negative shear. The profile reconstruction and real-time monitoring of the physical parameters are conducive to evaluating the quality of H mode discharge experiment and can assist in the steady-state operation of advanced operating modes such as HL-2M high normalized beta (βn) discharge. -
Keywords:
- HL-2A /
- OMFIT platform /
- integrated modeling framework
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中国物理学会期刊
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