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Design and characterisation of toroidal cyclotron resonators for the PENTATRAP experiment


Bowien Tolstra,  Larissa
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Bowien Tolstra, L. (2023). Design and characterisation of toroidal cyclotron resonators for the PENTATRAP experiment. Bachelor Thesis, Ruprecht-Karls-Universität, Heidelberg.

Cite as: https://hdl.handle.net/21.11116/0000-000E-4C21-8
Mass measurements with a relative precision of ≤ 10−11, like they are performed at the PENTATRAP experiment in Heidelberg, require a high quality detection system to measure the small currents in the order of a few fA, that are induced by the motion of an ion inside a Penning trap. Over the course of this bachelor thesis, toroidal cyclotron resonators are developed and characterised for a future absolute mass measurement of 133Cs at the PENTATRAP experiment. The coils for the resonant circuits in the few ten MHz regime are made from copper wire. Additionally novel designs made from superconducting niob-titanium wire are developed as well. High Q-factors are reached from both approaches. In this context additional tests of voltage controlled resonance frequency tuning with varactor diodes have been successfully performed, reaching tuning ranges of > 10%. The impact on Q-factors with different board designs of the cryogenic amplifiers was investigated.