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Frequenz-Stabilisierung eines als Paulfalle betriebenen Hohlraumresonators auf die Resonanzfrequenz

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Kundy,  Lasse
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Kundy, L. (2020). Frequenz-Stabilisierung eines als Paulfalle betriebenen Hohlraumresonators auf die Resonanzfrequenz. Bachelor Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: https://hdl.handle.net/21.11116/0000-0007-365D-5
Abstract
The radial storage of highly charged ions in a Paul trap requires an ultra stable and electrically oscillating quadrupolfield. At CryPTEx-2 (cryogenic Paul trap experiment 2) it is generated by a superconducting radio-frequency cavity [1]. The unloaded quality factor of 230 000 is extremely high. For efficient use, the cavity should be driven at cryogenic temperatures with its resonance frequency ν0 ≈ 34,53 MHz. The incoupling of energy leads to power losses in the cavity. This is accompanied by temperature changes in the trap, which can shift the geometry and thus influence the resonance frequency. In addition, the ultra-high vacuum worsens at higher temperatures, which limits the storage time of the trapped ions. One would like to avoid this. As part of this bachelor thesis, an algorithm was developed that stabilizes the frequency of the incoupled signal to the resonance frequency of the cavity. Initially, this was successfully applied to the prototype of the superconducting resonator. With a step size of νshift = 2 kHz the frequency could be shifted to its resonance frequency ν0 ≈ 29,668 MHz. Finally, the superconducting resonator could also be tuned to its resonance frequency ν0 = 34,530 866 MHz with an extremely small step size of νshift = 10 Hz.