Mitigation of loss within a molecular Stark decelerator
Mitigation of loss within a molecular Stark decelerator
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DOI：
10.1140/epjd/e2008-00097-y
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发表时间：
2007-05
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影响因子：
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通讯作者：
B. Sawyer;B. Stuhl;B. Lev;J. Ye;E. Hudson
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文献类型：
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作者：
B. Sawyer;B. Stuhl;B. Lev;J. Ye;E. Hudson
斯塔克减速器内的横向运动在减速的总效率中起着很大的作用。我们区分两个不同的制度的分子损失在放缓的过程中。第一种机制涉及由于横向和纵向运动的耦合而引起的分布损失，而第二种机制是最后几个阶段内分子速度迅速降低的结果。在这项工作中，我们描述了这些影响，并提出了克服这些影响的方法。基于现有减速器几何形状的修改后的开关时间序列的解决方案导致在中间速度区域中稳定分子的大增益，但未能解决在非常低的最终速度下的损失。我们提出了一种新的减速器的设计，四极引导减速器，它消除了分布的损失，由于整个减速过程中的横向/纵向耦合，也表现出增益超过正常减速到最低速度。
The transverse motion inside a Stark decelerator plays a large role in the total efficiency of deceleration. We differentiate between two separate regimes of molecule loss during the slowing process. The first mechanism involves distributed loss due to coupling of transverse and longitudinal motion, while the second is a result of the rapid decrease of the molecular velocity within the final few stages. In this work, we describe these effects and present means for overcoming them. Solutions based on modified switching time sequences with the existing decelerator geometry lead to a large gain of stable molecules in the intermediate velocity regime, but fail to address the loss at very low final velocities. We propose a new decelerator design, the quadrupole-guiding decelerator, which eliminates distributed loss due to transverse/longitudinal couplings throughout the slowing process and also exhibits gain over normal deceleration to the lowest velocities.