论文标题
用自稳态的引导电流和能量粒子约束优化的准对称恒星剂
Optimization of quasisymmetric stellarators with self-consistent bootstrap current and energetic particle confinement
论文作者
论文摘要
准对称可以大大改善恒星中能量颗粒和热等离子体的限制。在高等离子体压力下，甲壳度恒星剂的磁场受到自举电流的显着影响，但是准确的恒星自举计算的计算成本已排除在优化内部的使用。在这里，展示了一种新的有效方法，以优化准对称恒星构型构型，从而使Bootstrap电流轮廓与几何形状一致。该方法是基于以下事实：准对称中的所有新古典现象对轴对称的人都是同构。因此，可以迅速评估的Tokamaks中引导电流的准确公式也可以在恒星剂中应用。该预测的并行电流与磁流失动力平衡中的实际平行电流之间的偏差在目标函数中受到惩罚，并且在参数空间中包括平衡的当前轮廓。因此，使用自动引导电流和出色的限制，可以获得具有重大压力的准对称构型。在比较融合生产的α粒子限制的许多恒星粒子的比较中，新型构型的α能量损失明显低于许多以前的设计。
Quasisymmetry can greatly improve the confinement of energetic particles and thermal plasma in a stellarator. The magnetic field of a quasisymmetric stellarator at high plasma pressure is significantly affected by the bootstrap current, but the computational cost of accurate stellarator bootstrap calculations has precluded use inside optimization. Here, a new efficient method is demonstrated for optimization of quasisymmetric stellarator configurations such that the bootstrap current profile is consistent with the geometry. The approach is based on the fact that all neoclassical phenomena in quasisymmetry are isomorphic to those in axisymmetry. Therefore accurate formulae for the bootstrap current in tokamaks, which can be evaluated rapidly, can be applied also in stellarators. The deviation between this predicted parallel current and the actual parallel current in the magnetohydrodynamic equilibrium is penalized in the objective function, and the current profile of the equilibrium is included in the parameter space. Quasisymmetric configurations with significant pressure are thereby obtained with self-consistent bootstrap current and excellent confinement. In a comparison of fusion-produced alpha particle confinement across many stellarators, the new configurations have significantly lower alpha energy losses than many previous designs.
