München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Instrumentation XII

HK 53.6: Vortrag

Donnerstag, 21. März 2019, 15:30–15:45, HS 12

Collinear Laser Spectroscopy for High Voltage Metro-
logy at 1 ppm relative precision
— •Patrick Mueller1, Joerg Kraemer1, Kristian Koenig1, Christopher Geppert2, Phillip Imgram1, Bernhard Maaß1, Johann Meisner3, Ernst W. Otten4, Stephan Passon3, Tim Ratajczyk1, Johannes Ullmann1,5, and Wilfried Noertershaeuser11Inst. f. Kernphysik, Technische Universitaet Darmstadt — 2Inst. f. Kernchemie, Johannes Gutenberg Universitaet Mainz — 3Physikalisch-Technische Bundesanstalt, Braunschweig — 4Inst. f. Physik, Johannes Gutenberg Universitaet Mainz — 5Inst. f. Kernphysik, WWU Muenster

Electrostatic acceleration or deceleration is an integral part of many nuclear and atomic physics experiments. If the goal is to exactly define or measure a particle’s kinetic energy, accurate high voltage measurements become inevitable. The best high-voltage dividers provide accuracy at the 1-ppm level by scaling down high voltages via resistor chains, however regular elaborate calibration and cross checking is needed. This process can be obviated by directly attributing voltage to frequency, exploiting the Doppler effect on accelerated ions. We report on improved measurements at the ALIVE experiment at TU Darmstadt for high voltage determination using a pump-and-probe approach on accelerated Ca+ ions using two lasers to address the Ca+ ions before and after the acceleration. In the latest configuration a relative precision of 1 ppm was achieved. The absolute nature of the measurement allows the definition of a new high voltage standard and constitutes a reliable calibration apparatus for high voltage dividers.

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