アイテム詳細

要旨

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.