Sympathetic cooling is a method used to lower the kinetic energy of ions with complicated energy-level structures, via Coulomb interactions with laser-cooled ions in an ion trap. The ion to be sympathetically cooled is sometimes prepared outside of the trap, and it is critical to introduce this ion into the trap by temporarily lowering the potential of one endcap without allowing the coolant ion to escape. We study the time required for a laser-cooled ion to escape from a linear Paul trap when the voltage of one endcap is lowered. The escape time is on the order of a few microseconds, and varies significantly when the low-level voltage changes. A re-cooling time of a maximum of 13 s was measured, which can be reduced to approximately one hundred of milliseconds by decreasing the duration of the low-level voltage. The measurement of these critical values lays the foundation for the smooth injection and cooling of the ion to be sympathetically cooled.

中文翻译：

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通过快速切换端帽电压，显着提高了线性Paul阱中单个40 Ca +离子的逸出时间

交感冷却是一种通过与离子阱中激光冷却的离子发生库仑相互作用，降低具有复杂能级结构的离子的动能的方法。待同情地冷却的离子有时会在阱的外部制备，通过暂时降低一个端盖的电势而不让冷却剂离子逸出，将离子引入阱中至关重要。我们研究了当一个端盖的电压降低时，激光冷却离子从线性Paul阱中逸出所需的时间。逸出时间约为几微秒，当低电平电压变化时，逸出时间会显着变化。测得的最大再冷却时间为13 s，通过降低低电平电压的持续时间可以将其缩短到大约一百毫秒。