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Setup of a vibration-suppressed cryogenic system for a RF ion trap with minimum micromotion


Spieß,  Lukas Josef
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Spieß, L. J. (2018). Setup of a vibration-suppressed cryogenic system for a RF ion trap with minimum micromotion. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: http://hdl.handle.net/21.11116/0000-0002-5FDF-A
Recent advancements allow for sympathetic cooling of highly charged ions (HCI) to mK temperatures in a cryogenic linear Paul trap. This makes high precision spectroscopy of HCI possible, paving the way to the search for new physics and novel optical clocks. For this, a highly stable and well-understood Paul trap is required. In particular, excess micromotion needs to be characterized and reduced, since it can limit the lowest achievable ion temperature and therefore spectroscopic precision. Within this thesis, a new cryogenic supply system was partly assembled, which allows for vibrational decoupling of the trap, increasing storage stability. The first cool down test achieved a temperature of 4:23K in the trap environment, which is sufficiently low for superconductive operation of the intended RF-resonator made from niobium. Additionally, a photon-correlation technique was used on the existing cryogenic linear Paul trap using 9Be+ ions for determination of the trap frequency by measuring the phase shift between the driven ions motion and the driving field. From the trap frequency the magnification of the imaging system is deduced. The same photon-correlation technique is used to measure excess micromotion and to demonstrate its reduction by a factor of 100 compared to a previous measurement by using new electronics.