High Voltage Determination and Stabilization for Collinear Laser Spectroscopy Applications

Abstract

Fast beam collinear laser spectroscopy is the established method to investigate nuclear ground state properties such as the spin, the electromagnetic moments, and the charge radius of exotic nuclei. These are extracted with high precision from atomic observables, i.e., the hyperfine splitting and its the isotope shift, which becomes possible due to a large reduction of the Doppler broadening by compressing the velocity width of the ion beam through electrostatic acceleration. With the advancement of the experimental methods and applied devices, e.g., to measure and stabilize the laser frequency, the acceleration potential became the dominant systematic uncertainty contribution. To overcome this, we present a custom-built high-voltage divider, which was developed and tested at the German metrology institute (PTB), and a feedback loop that enabled collinear laser spectroscopy to be performed at a 100-kHz level. Furthermore, we describe the impact of field penetration into the laser-ion-interaction region. This strongly affects the determined isotope shifts and hyperfine splittings, if Doppler tuning is applied, i.e., the ion beam energy is altered instead of scanning the laser frequency. Using different laser frequencies that were referenced to a frequency comb, the field penetration was extracted laser spectroscopically. This allowed us to define an effective scanning potential to still apply the faster and easier Doppler tuning without introducing systematic deviations.

References in corpus (19)

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• Probing new light force-mediators by isotope shift spectroscopy
• Laser Spectroscopy for the Study of Exotic Nuclei
• Charge radii of exotic potassium isotopes challenge nuclear theory and the magic character of $N=32$
• Measurement and microscopic description of odd-even staggering of charge radii of exotic copper isotopes
• Nuclear Charge Radius of ${}^{12}$Be
• Improved limit on the ${}^{225}$Ra electric dipole moment
• Charge Radius of Neutron-deficient ${}^{54}$Ni and Symmetry Energy Constraints Using the Difference in Mirror Pair Charge Radii
• Precision high voltage divider for the KATRIN experiment
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• Calibration of the ISOLDE acceleration voltage using a high-precision voltage divider and applying collinear fast beam laser spectroscopy
• Calibration of high voltages at the ppm level by the difference of ${}^{83\mathrm{m}}$Kr conversion electron lines at the KATRIN experiment
• Kinetic-beam-energy determination via collinear laser spectroscopy
• Nuclear charge radius of ${}^{26m}$Al and its implication for V${}_{ud}$ in the quark-mixing matrix
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• High-stability, high-voltage power supplies for use with multi-reflection time-of-flight mass spectrographs
• Collinear laser spectroscopy of highly charged ions produced with an electron beam ion source
• Ab initio calculations of the hyperfine structure of 109Cd, 109Cd+ and reevaluation of the nuclear quadrupole moment Q(109Cd)
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Cited by in corpus (2)

• Transition frequencies, isotope shifts, and hyperfine structure in $4s\to 4p$ transitions of Ti${}^{+}$ ions
• A new beamline for Resonant Excitation of Beams with Electromagnetic fields and Lasers (REBEL) and Stopping and Trapping of Radioactive Isotopes for Precision Experiments (STRIPE)