Simulation of cryogenic buffer gas beams
Simulation of cryogenic buffer gas beams
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DOI：
10.1103/physrevresearch.3.023018
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发表时间：
2021-04-06
影响因子：
4.2
通讯作者：
Hutzler, Nicholas R.
中科院分区：
文献类型：
--
作者：
Takahashi, Yuiki;Shlivko, David;Hutzler, Nicholas R.
低温缓冲气体束（CBGB）是研究冷分子和超冷分子的重要工具。虽然存在增强CBGB的所需光束特性（诸如高通量、低速度或减小的发散度）的已知技术，但是它们通常没有经历详细的数值优化。缓冲气体束的数值模拟是具有挑战性的，因为相关的动力学发生在密度按数量级变化的区域，使得典型的数值方法不可靠或难以处理。在这里，我们模拟CBGB的混合方法，结合气体动力学方法与粒子跟踪。模拟捕捉重要的属性，如速度和发散，在各种各样的设计，包括两级减速细胞和德拉瓦尔喷嘴。因此，这种方法应该是一个有用的工具，优化CBGB设计在广泛的应用。
The cryogenic buffer gas beam (CBGB) is an important tool in the study of cold and ultracold molecules. While there are known techniques to enhance desired beam properties of a CBGB, such as high flux, low velocity, or reduced divergence, they have generally not undergone detailed numerical optimization. Numerical simulation of buffer gas beams is challenging, because the relevant dynamics occur in regions where the density varies by orders of magnitude, rendering typical numerical methods unreliable or intractable. Here we simulate CBGBs with a hybrid approach that combines gas dynamics methods with particle tracing. The simulations capture important properties, such as velocitiy and divergence, across an assortment of designs, including two-stage slowing cells and de Laval nozzles. This approach should therefore be a useful tool for optimizing CBGB designs across a wide range of applications.