Schmöger L, Schwarz M, Baumann T M, Versolato O O, Piest B, Pfeifer T, Ullrich J, Schmidt P O, López-Urrutia J R Crespo
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany.
Rev Sci Instrum. 2015 Oct;86(10):103111. doi: 10.1063/1.4934245.
Preparing highly charged ions (HCIs) in a cold and strongly localized state is of particular interest for frequency metrology and tests of possible spatial and temporal variations of the fine structure constant. Our versatile preparation technique is based on the generic modular combination of a pulsed ion source with a cryogenic linear Paul trap. Both instruments are connected by a compact beamline with deceleration and precooling properties. We present its design and commissioning experiments regarding these two functionalities. A pulsed buncher tube allows for the deceleration and longitudinal phase-space compression of the ion pulses. External injection of slow HCIs, specifically Ar(13+), into the linear Paul trap and their subsequent retrapping in the absence of sympathetic cooling is demonstrated. The latter proved to be a necessary prerequisite for the multi-pass stopping of HCIs in continuously laser-cooled Be(+) Coulomb crystals.
将高电荷离子（HCI）制备成冷且强局域化的状态，对于频率计量以及精细结构常数可能的空间和时间变化测试而言具有特别的意义。我们通用的制备技术基于脉冲离子源与低温线性保罗阱的通用模块化组合。这两种仪器通过具有减速和预冷却特性的紧凑束线相连。我们展示了关于这两种功能的设计和调试实验。一个脉冲聚束管可实现离子脉冲的减速和纵向相空间压缩。演示了将慢速HCI（特别是Ar(13+)）外部注入线性保罗阱，并在没有交感冷却的情况下随后重新捕获它们。事实证明，后者是HCI在连续激光冷却的Be(+)库仑晶体中多次停止的必要前提条件。
