Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 14: Precision Spectrosocopy III - trapped ions (joint session A/Q)
A 14.1: Invited Talk
Monday, March 5, 2018, 16:15–16:45, K 1.016
Collinear Laser Spectroscopy for High Voltage Metrology at the 1 ppm accuracy level — •Jörg Krämer1, Kristian König1, Christopher Geppert2, Phillip Imgram1, Bernhard Maaß1, Johann Meisner3, Ernst W. Otten4, Stephan Passon3, Tim Ratajczyk1, Johannes Ullmann5, and Wilfried Nörtershäuser1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2Institut für Kernchemie, Johannes Gutenberg Universität Mainz — 3Physikalisch-Technische Bundesanstalt, Braunschweig — 4Institut für Physik, Johannes Gutenberg Universität Mainz — 5Institut für Kernphysik, Westfälische Wilhelms-Universität Münster
Voltages of the order of a few Volts can be traced back to a Josephson standard that converts a microwave frequency to a voltage by inducing a current between two superconductors. However, high voltages cannot be traced back directly, but have to be divided down by precision high voltage dividers that reach a relative accuracy of 1 ppm at best.
Similar to the Josephson effect, collinear laser spectroscopy connects the laser frequency in the laboratory frame to the high voltage used to accelerate the ions via the Doppler shift. Since this frequency can be measured with 1 Hz precision using an optical frequency comb, this technique has the potential to reach an accuracy of <1 ppm.
We will present results of laser spectroscopic high voltage measurements using a pump and probe scheme on Ca ions at the 5 ppm level, and we will elaborate on how we plan to further decrease our uncertainties by using indium ions from a liquid metal ion source and an alternative pump and probe approach.