Microwave injection for the ALPHATRAP experiment and developments of the multi-reflection time-of-flight technique of the ISOLTRAP experiment

This thesis presents work done at the ALPHATRAP g-factor experiment at the MPIK in Heidelberg and at the mass spectrometry experiment ISOLTRAP at ISOLDE/CERN. At ALPHATRAP a system for microwave transmission from the room temperature environment to the cryogenic trap tower was designed. Microwave horns were used for contact free power transfer in a first step to a 77K temperature shield and in a second step to the trap tower cooled to 4.2 K. Additional devices for the alignment of a laser beam with the microwaves and a mode filter were designed. At ISOLTRAP, studies for multi-reflection time-of-flight mass measurements (MR-ToF MS) were performed. A distortion of the peaks in the time-of-flight spectrum due to the radiofrequency field in the RFQ used for beam preparation was investigated and reduced. In order to improve the ion optics, a new Einzel lens was designed and a new quadrupole bender was commissioned. The stability of mass measurements using the ISOLTRAP MR-ToF MS with ions from an off-line reference ion source were investigated. For measurements with a total recording time of more than one minute, a systematic error on the order of 100 keV was determined. It was reduced for shorter measurement cycles, where the uncertainty due to low statistics dominates.