Hannover 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
SYAD: Symposium SAMOP Dissertation Prize 2020
SYAD 1: SAMOP Dissertation Prize
SYAD 1.2: Hauptvortrag
Dienstag, 10. März 2020, 11:30–12:00, e415
Laser-Based High-Voltage Metrology with ppm Accuracy — •Kristian König1,2, Christopher Geppert3, Phillip Imgram2, Jörg Krämer2, Bernhard Maaß2, Johann Meisner4, Ernst Otten3, Stephan Passon4, Tim Ratajczyk2, Johannes Ullmann2, and Wilfried Nörtershäuser2 — 1Michigan State University, East Lansing, USA — 2TU Darmstadt, Darmstadt — 3Johannes Gutenberg-Universität, Mainz — 4Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
The ALIVE experiment at the TU Darmstadt is a new collinear laser spectroscopy setup that has been designed, constructed and commissioned particularly for the measurement of high voltages in the range of 10 to 100 kV. An accuracy of at least 1 ppm is targeted which is of high interest for metrology as well as for scientific applications like, e.g., the KATRIN experiment. Earlier attempts with this technique were limited by the uncertainty of the optical frequency measurement or the uncertainty of the real starting potential of the ions in the ion source. In the ALIVE (Accurate Laser Involved Voltage Evaluation) experiment, a two-stage laser interaction for optical pumping and probing is combined with a highly accurate frequency determination with a frequency comb to overcome these limitations. 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 post-acceleration voltages between -5 kV and -19 kV. We demonstrated a 5-ppm accuracy and further improvements of the apparatus are ongoing to reach sub-ppm accuracy.