反冲式质量分离器的在线贝叶斯优化
Online Bayesian Optimization for a Recoil Mass Separator
摘要：
捕获反应分离器（SECAR）是稀有同位素束流装置（FRIB）的下一代反冲分离器系统，用于直接测量逆运动学中不稳定核的捕获反应。为了最大限度地提高该系统的性能，需要实现对射束与中心射束轴的对准以及对离子光学设置的严格要求。这些可能难以通过人工操作员的手动调整来实现，而不会潜在地使系统处于次优和不可再现的状态。在这项工作中，我们提出了第一个发展的在线贝叶斯优化与高斯过程模型调整离子束通过核天体物理反冲分离器。我们表明，这种方法实现了小传入的角度偏差（\textless 1毫拉德），在一个有效的和可重复的方式，是至少三倍的速度比标准的手调整。此外，我们还提出了一种用于离子光学实验优化的贝叶斯方法，并证明了该方法的有效性，对某些束流的质量分离提高了32%.
英文摘要：
The SEparator for CApture Reactions (SECAR) is a next-generation recoil separator system at the Facility for Rare Isotope Beams (FRIB) designed for the direct measurement of capture reactions on unstable nuclei in inverse kinematics. To maximize the performance of this system, stringent requirements on the beam alignment to the central beam axis and on the ion-optical settings need to be achieved. These can be difficult to attain through manual tuning by human operators without potentially leaving the system in a sub-optimal and irreproducible state. In this work, we present the first development of online Bayesian optimization with a Gaussian process model to tune an ion beam through a nuclear astrophysics recoil separator. We show that this method achieves small incoming angular deviations (\textless 1 mrad) in an efficient and reproducible manner that is at least three times faster than standard hand-tuning. Additionally, we present a Bayesian method for experimental optimization of the ion optics, and show that it validates the nominal theoretical ion-optical settings of the device, and improves the mass separation by 32\% for some beams.
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