SMuK 2023 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 74: Poster
HK 74.15: Poster
Donnerstag, 23. März 2023, 17:30–19:00, HSZ EG
Setup of high-precision voltage dividers for collinear laser spectroscopy experiments at TU Darmstadt and ISOLDE/CERN — •Finn Köhler1, Kristian König1, Johann Meisner2, Wilfried Nörtershäuser1, and Stephan Passon2 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2Physikalische Technische Bundesanstalt, Braunschweig, Germany
Collinear laser spectroscopy is a well-established technique to investigate ground-state properties of stable and short-lived isotopes. By accelerating an ion beam electrostatically to 20-60 keV, the Doppler width is drastically reduced to the order of the natural linewidth, which enables measurements with high resolution. To achieve a high accuracy in the isotope shift measurements, the acceleration voltage of the ions needs to be precisely known to account for the Doppler shift of the ions.
To determine this voltage, three high-voltage dividers inspired by precision dividers of the Physikalisch-Technische Bundesanstalt were set up and calibrated against a reference divider. With active temperature stabilization a relative accuracy of 5 ppm was achieved. At ISOLDE the voltage of the beam preparation trap and of the MIRACLS multi-reflection electrodes are measured and at TU Darmstadt, it is used to actively stabilize the voltage of the ion source. We additionally report on an upgrade of the 25m deep-UV laser-light transport to COLLAPS.
Support from BMBF under contract 05P21RDCI1 is acknowledged.