Zeeman deceleration beyond periodic phase space stability
Zeeman deceleration beyond periodic phase space stability
复制标题
超出周期性相空间稳定性的塞曼减速
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
T. Softley
中科院分区：
文献类型：
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作者：
J. Toscano;A. Tauschinsky;K. Dulitz;C. Rennick;B. R. Heazlewood;T. Softley
在塞曼减速中，使用时变空间非均匀磁场来创建具有可调前进速度的平移冷、量子态选择顺磁粒子包，这是冷反应动力学研究的理想选择。本文采用协方差矩阵自适应进化策略对塞曼减速器运行中的减速切换序列进行优化。使用优化序列，在相同的最终速度下，与标准序列相比，观察到减速粒子的数量增加了40%，施加相同的实验边界条件。此外，我们证明，与标准序列最多可去除83%的动能相比，它可以去除入射光束中高达98%的粒子初始动能。采用三维粒子轨迹模拟再现了实验结果，并研究了标准序列和优化序列在减速机理上的差异。实验证明，进化算法揭示的最优解不仅仅是实验参数的局部优化，它是一种超越通常采用的标准周期相位稳定方法的新颖操作模式。
In Zeeman deceleration, time-varying spatially inhomogeneous magnetic fields are used to create packets of translationally cold, quantum-state-selected paramagnetic particles with a tuneable forward velocity, which are ideal for cold reaction dynamics studies. Here, the covariance matrix adaptation evolutionary strategy is adopted in order to optimise deceleration switching sequences for the operation of a Zeeman decelerator. Using the optimised sequences, a 40% increase in the number of decelerated particles is observed compared to standard sequences for the same final velocity, imposing the same experimental boundary conditions. Furthermore, we demonstrate that it is possible to remove up to 98% of the initial kinetic energy of particles in the incoming beam, compared to the removal of a maximum of 83% of kinetic energy with standard sequences. Three-dimensional particle trajectory simulations are employed to reproduce the experimental results and to investigate differences in the deceleration mechanism adopted by standard and optimised sequences. It is experimentally verified that the optimal solution uncovered by the evolutionary algorithm is not merely a local optimisation of the experimental parameters—it is a novel mode of operation that goes beyond the standard periodic phase stability approach typically adopted.
塞曼减速器中整体相空间接受度模型
DOI：
10.48550/arxiv.1501.02204
发表时间：
2015
期刊：
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影响因子：
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作者：
Dulitz K
通讯作者：
Dulitz K
DOI：
10.1063/1.4866906
发表时间：
2014
期刊：
The Journal of chemical physics
影响因子：
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作者：
Dulitz K
通讯作者：
Dulitz K