%0 Thesis
%A König, Kristian
%T Laser-Based High-Voltage Metrology with ppm Accuracy
%I Technische Universität Darmstadt
%V Dissertation
%C Darmstadt
%M GSI-2019-00394
%P 124 S.
%D 2019
%Z Dissertation, Technische Universität Darmstadt, 2018
%X A beamline for high-precision collinear laser spectroscopy was designed, constructed and commissioned within this work. The main aspect was the development of a technique for a precise high-voltage determination with an accuracy in the sub-ppm regime. It is based on the laser-spectroscopic measurement of an ion velocity after acceleration with the high-voltage of interest by the determination of the Doppler shifted transition frequency. With an accurate knowledge of the rest-frame transition frequency and the mass, the high-voltage of interest can be traced back on natural constants like the speed of light and the elementary charge as well as on the measurement of a laser frequency. Since the laser frequency can be accurately determined with a frequency comb, this technique fulfills the requirements for the definition of a quantum standard. In first measurements with Ca⁺ and In⁺ ions, accuracies in the determination of high voltages between 1 kV and 20 kV of the order of 5 ppm were demonstrated. This corresponds to an increase in precision by a factor of 20 compared to earlier attempts and is mainly achieved by the improved experimental setup and the newly developed two-chamber approach with reference measurements. Further improvements of the laser stabilization scheme and of the laser-ion beam superposition that have been realized within this work, have the potential to enable laser-based high-voltage evaluations with uncertainties below 1 ppm. This would outperform the conventional technique based on high-voltage dividers and yield an unprecedented accuracy whereof several applications in metrology and science can benefit.
%F PUB:(DE-HGF)11
%9 Dissertation / PhD Thesis
%U https://repository.gsi.de/record/218416