Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Instrumentation IX
HK 27.2: Gruppenbericht
Dienstag, 27. Februar 2018, 17:00–17:30, Audimax H1
Accurate High Voltage measurements based on laser spectroscopy — •Kristian König1, Christopher Geppert2, Phillip Imgram1, Jörg Krämer1, Bernhard Maaß1, Johann Meisner3, Ernst Wilhelm Otten4, Stephan Passon3, Tim Ratajczyk1, Johannes Ullmann1,5, and Wilfried Nörtershäuser1 — 1Institut für Kernphysik, TU 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
The ALIVE experiment at the TU Darmstadt is a collinear laser spectroscopy setup that has been developed for the measurement of high voltages in the range of 10 to 100 kV with highest precision and accuracy. Here, ions with a well-known mass and transition frequency are accelerated with the voltage that has to be measured and their Doppler shift is examined precisely with laser spectroscopic methods. An accuracy of at least 1 ppm is targeted which is of interest for metrology as well as applications like, e.g. the KATRIN experiment. We will present the results we achieved with 40Ca+ ions where the well-known 4S1/2 → 4P3/2 and the 3D3/2→ 4P3/2 transitions were used to identify the ion velocities before and after the acceleration which are already in the 5 ppm level. To improve this uncertainty, indium ions from a liquid metal ion source and an alternative pump and probe approach will be used in the next stage.