论文标题
瑞士光源升级的动态孔径的多目标优化
Multi-objective optimization of the dynamic aperture for the Swiss Light Source upgrade
论文作者
论文摘要
瑞士光源的升级（称为SLS 2.0）计划于2023-24处进行。当前的存储环将被基于多弯曲的Achromats取代，允许亮度更高30倍。由于更强的聚焦和所需的色彩补偿，因此找到了相当大的动态孔径（DA）进行注入，以及对足够光束寿命的能量接受，这是具有挑战性的。为了最大化DA并延长光束寿命，我们将众所周知的跟踪代码Tracy与多目标遗传算法（MOGA）的大规模平行实现相结合，并通过约束处理方法进一步扩展了此方法。然后，我们优化了两个晶格的磁铁配置：将在调试阶段（阶段1）中使用的晶格，以及后来将在完成阶段（阶段2）中使用的晶格。最后，我们显示并进一步分析了所选的磁体构型，在相1晶格的情况下，将其与先前的，手动优化的解决方案进行了比较。
The upgrade of the Swiss Light Source, called SLS 2.0, is scheduled for 2023-24. The current storage ring will be replaced by one based on multi-bend achromats, allowing for about 30 times higher brightness. Due to the stronger focusing and the required chromatic compensation, finding a reasonably large dynamic aperture (DA) for injection, as well as an energy acceptance for a sufficient beam lifetime, is challenging. In order to maximize the DA and prolong the beam lifetime, we combine the well-known tracking code tracy with a massively parallel implementation of a multi-objective genetic algorithm (MOGA), and further extend this with constraint-handling methods. We then optimize the magnet configuration for two lattices: the lattice that will be used in the commissioning phase (phase-1), and the lattice that will be used afterwards, in the completion phase (phase-2). Finally, we show and further analyze the chosen magnet configurations and in the case of the phase-1 lattice compare it to a pre-existing, manually optimized solution.
