Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision spectroscopy of atoms and ions (with Q)
A 30.23: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
A vibration-free cryogenic system for ion traps — Maria Schwarz1,2, •Peter Micke1,2, Lisa Schmöger1,2, Tobias Leopold2, Thomas Pfeifer1, José R. Crespo López-Urrutia1, and Piet O. Schmidt2,3 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Physikalisch-Technische Bundesanstalt, QUEST, Braunschweig, Germany — 3Leibniz Universität Hannover, Germany
Cold highly charged ions (HCI) can be sensitive detectors for possible small variations of fundamental constants, e.g. of the fine-structure constant on a level of 10−19 per year. High precision spectroscopy, such as quantum logic spectroscopy, is needed to probe the highly forbidden optical transitions in HCIs. A cryogenic environment is essential to suppress charge exchange with residual gas in order to achieve long HCI storage times. We have set up a cryogenic system based on the one of CryPTEx [1], using a pulse-tube cryocooler and nested temperature stages. In the upgraded CryPTEx-II, the cryocooler and the trap are 2 m apart, located in separate rooms for acoustic decoupling, and thermally linked by a vibration-suppression system. Mechanical vibrations due to pumps and the cryocooler are decoupled by means of edge-welded bellows, flexible ultra-pure copper links and a massive inertial pendulum.
M. Schwarz et al., Rev. Sci. Instrum. 83, 083115 (2012)