Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 9: Precision Spectroscopy of atoms and ions III (joint session A/Q)

A 9.3: Talk

Monday, March 11, 2019, 17:00–17:15, S HS 2 Physik

Towards Sympathetic Cooling of Protons and Antiprotons — •Matthew Bohman^1,2, Pascal Blessing^2,3, Jack Devlin², James Harrington¹, Andreas Mooser^1,2, Gerog Schneider^2,5, Christian Smorra², Markus Wiesinger^1,2, Elise Wursten^2,6, Klaus Blaum¹, Yasuyuki Matsuda⁴, Wolfgang Quint^3,7, Jochen Walz^5,8, and Stefan Ulmer² — ¹Max-Planck-Institut für Kernpysik, Germany — ²Fundamental Symmetries Laboratory, RIKEN, Japan — ³GSI, Germany — ⁴University of Tokyo, Japan — ⁵Mainz University, Germany — ⁶CERN, Switzerland — ⁷Heidelberg University, Germany — ⁸Helmholtz-Institut Mainz, Germany

High precision measurements on trapped protons and antiprotons provide some of the most stringent tests of CPT symmetry in the baryon sector. In particular, these experiments confirm CPT symmetry and provide further evidence of Lorentz invariance at the level of 10e-24 GeV on an absolute energy scale. Further precision, however, is limited by high particle energies and requires moving beyond the traditional techniques available in high precision cryogenic Penning trap experiments. We present a novel technique to sympathetically cool protons and antiprotons stored in separate traps, by coupling single particles to laser cooled ions via image currents induced in a common endcap electrode. We place our work in the context of an improved g-factor measurement of the proton and show early results including the application of methods to measure sub-thermal single particle energy distributions in the laser cooled limit.