Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 14: Precision Spectrosocopy II - trapped ions (joint session A/Q)
Q 14.5: Talk
Monday, March 5, 2018, 15:30–15:45, K 1.016
Measurements with single antiprotons in an ultra-low noise Penning trap system — •Matthias Borchert1,2, James Harrington3, Takashi Higuchi2,4, Jonathan Morgner1,2, Hiroki Nagahama2, Stefan Sellner2, Christian Smorra2, Matthew Bohman2,3, Andreas Mooser2, Georg Schneider2,5, Natalie Schoen5, Markus Wiesinger2,3, Klaus Blaum3, Yasuyuki Matsuda4, Christian Ospelkaus1,6, Wolfgang Quint7, Jochen Walz5,8, Yasunori Yamazaki2, and Stefan Ulmer2 — 1Institut für Quantenoptik, Leibniz Univerisität Hannover, Germany — 2RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Japan — 3Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 4Graduate School of Arts and Sciences, University of Tokyo, Japan — 5Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany — 6Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 7GSI - Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 8Helmholtz-Institut Mainz, Germany
The observed baryon asymmetry in our Universe challenges the Standard Model of particle physics and motivates sensitive tests of CPT invariance. Inspired by that, the BASE experiment at CERN compares the fundamental properties of antiprotons and protons with high precision.
In 2014 we performed the most precise measurement of the antiproton charge-to-mass-ratio qp/mp [1], with a fractional precision of 69 ppt. Very recently we reported on a 350-fold improved measurement of the antiproton magnetic moment µp [2] using a newly-invented multi-Penning trap method. The high-precision measurement of µp was enabled by a highly-stabilised experimental apparatus including ultra-low electric field fluctuations.
In this talk I will focus on the characterisation and optimisation of electric field noise and the interpretation of heating rates at different radial amplitudes causing axial frequency fluctuations. The optimised Penning trap heating rates measured in BASE are well below the heating rates which are usually reported in Paul traps. Furthermore, I will summarize recent experimental developments and discuss future prospects of BASE.
[1] Ulmer et al., Nature 524, 196-199 (2015)
Smorra et al., Nature 550, 371-374 (2017)