Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 4: Precision Spectroscopy I
A 4.5: Talk
Monday, March 6, 2017, 15:45–16:00, N 3
Development of a Modified-Cyclotron Detection System for Resistively Cooling a Single Trapped Antiproton — •James Harrington1,2, Mustafa Besirli2, Matthias Borchert2,4, Takashi Higuchi2,5, Hiroki Nagahama2,5, Stefan Sellner2, Christian Smorra2,3, Toya Tanaka2,5, Matthew Bohman1,2, Andreas Mooser2, Georg Schneider6,2, Natalie Schön6, Klaus Blaum1, Yasuyuki Matsuda5, Christian Ospelkaus4,7, Wolfgang Quint8, Jochen Walz6,9, Yasunori Yamazaki10, and Stefan Ulmer2 — 1Max-Planck-Institut für Kernphysik, Germany — 2Ulmer Initiative Research Unit RIKEN, Wako, Japan — 3CERN, Geneva, Switzerland — 4Institut für Quantenoptik, Leibniz Universität Hannover, Germany — 5Graduate School of Arts and Sciences, University of Tokyo, Japan — 6Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany — 7Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 8GSI-Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 9Helmholtz-Institut Mainz, Germany — 10Atomic Physics Laboratory RIKEN, Wako, Japan
The development of an improved tuned circuit, for resistively cooling the modified-cyclotron mode of a single trapped antiproton, is described. Efficient cooling of the radial modified-cyclotron mode is of the utmost importance when performing single particle spin quantum-transition spectroscopy in Penning traps. This is because at low modified-cyclotron quantum states the radial heating rates are small, which improves axial frequency stability. This is necessary to improve the spin-flip identification fidelity, which is crucial for our planned high-precision measurement of the antiproton g-factor. This system has been developed as an upgrade for the BASE experiment, located at CERN’s antiproton decelerator facility.
The instrument consists of a helical superconducting coil inside of a cylindrical copper shield which produces an unloaded Q-value on the order of 15000 at 29.774 MHz. When connected to the trap and active-amplifier electronics, a cooling time constant of τ≈ 18 s is achieved – a 17-fold improvement compared to the resistive damping system currently used in the experiment.