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Designing and characterization of a narrow microwave notch filter for the LSYM experiment in the 100 GHz regime

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Raab,  Fabian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Raab, F. (2024). Designing and characterization of a narrow microwave notch filter for the LSYM experiment in the 100 GHz regime. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: https://hdl.handle.net/21.11116/0000-0010-379E-F
Abstract
LSYM is an upcoming Penning trap experiment aiming the test for possible CPT violations in the Lepton sector with unprecedented precision. Its goal is the determine the difference of Larmor frequencies of the positron and electron at a fractional precision of 10−14. To achieve this, the modified cyclotron motion of the positron at a frequency of ν+ ≈ 140 GHz has to be cooled to the groundstate, due to realtivistic shifts. Simultaneously the Larmor frequency needs to be driven by an external drive to perform the measurements. To keep a cooled positron in the ground state of the modified cyclotron frequency almost all power at that frequency needs to be prohibited from entering the Penning trap. In this work a microwave filter was developed and characterized that achieves a high suppression. The filter is designed to be very narrow, to allow transmission of power at the Larmor frequency of the positron, which is only about 160MHz higher in frequency. It uses two tunable microwave cavities creating three poles due to the interaction between both of them. Two poles are a minimum of the transmission that is designed to appear at the modified cyclotron frequency. The third pole describes a minimum in the reflection, which is set to the Larmor frequency. Combining the two poles of the transmission curve into one, improves the performance of the filter compared to a single cavity.