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Abstract:
As part of this bachelor thesis, an external magnetic coil structure was
attached around the Paul trap structure and characterized. The aim was to
use the generated magnetic field to align the quantization axis of Be+ ions
parallel to the cooling laser in order to make the Doppler cooling of the ions
more efficient. For this purpose, the required currents for the coil pairs and
the magnetic field-current-ratio in the trap center were determined with COMSOL.
The field components of the prevailing earth’s magnetic field were then
determined experimentally in order to neutralize its impact on the quantization
axis. The influence of the generated magnetic field on the quality of the
resonator was also examined, since flux trapping leads to a reduction in the
quality. A decrease in the quality of ~ 3.2% with a magnetic field of 271.6 μT
was found. Finally, non-linearities were observed in the reflection spectrum of
the resonator, which occurred at input powers between 1.3dBm and 2.0dBm
and which causes require further investigation
