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arXiv 1004.5202physics.atom-phquant-ph
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单冷却laser线性射频阱中的离子动力学

Ion dynamics in a linear radio-frequency trap with a single cooling laser

Mathieu Marciante, Caroline Champenois, Annette Calisti, Jofre Pedregosa-Gutierrez, Martina Knoop

发表信息：
Physical Review A: Atomic, Molecular and Optical Physics 82 (2010) 033406
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摘要：

我们分析的可能性冷却离子与一个单一的激光束，由于库仑相互作用引起的运动的三个组件之间的耦合。为了这个目的，我们数值研究的离子云的动力学多达140个粒子，被困在一个线性四极电位和冷却的激光束在径向平面上传播。我们使用分子动力学模拟和模型的激光冷却的随机过程。对于运动的每个分量，我们系统地研究了温度与各向异性的捕获势的依赖关系。使用全射频（rf）电位得到的结果进行比较，相应的赝势。在射频的情况下，电势的旋转对称性必须被打破，以保持离子在阱内。然后，作为赝势的情况下，我们表明，库仑耦合的效率热化的运动组件依赖于云的几何配置。库仑耦合似乎是没有效率的离子组织为一条线或煎饼和三个组件的运动达到相同的温度，只有当云在三个维度上延伸。

英文摘要：

We analyse the possibility of cooling ions with a single laser beam, due to the coupling between the three components of their motion induced by the Coulomb interaction. For this purpose, we numerically study the dynamics of ion clouds of up to 140 particles, trapped in a linear quadrupole potential and cooled with a laser beam propagating in the radial plane. We use Molecular Dynamics simulations and model the laser cooling by a stochastic process. For each component of the motion, we systematically study the dependence of the temperature with the anisotropy of the trapping potential. Results obtained using the full radio-frequency (rf) potential are compared to those of the corresponding pseudo-potential. In the rf case, the rotation symmetry of the potential has to be broken to keep ions inside the trap. Then, as for the pseudo-potential case, we show that the efficiency of the Coulomb coupling to thermalize the components of motion depends on the geometrical configuration of the cloud. Coulomb coupling appears to be not efficient when the ions organise as a line or a pancake and the three components of motion reach the same temperature only if the cloud extends in three dimensions.

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