Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 39: Precision spectroscopy of atoms and ions IV (with Q)

A 39.1: Talk

Friday, March 27, 2015, 11:00–11:15, C/kHS

The BASE catching trap: A reservoir for antiprotons — •Christian Smorra for the BASE collaboration — CERN, CH-1211 Geneva 23, Switzerland

The Baryon-Antibaryon Symmetry Experiment BASE has commissioned a four-Penning trap system for the high-precision measurement of the antiproton magnetic moment at the Antiproton Decelerator (AD) of CERN. To inject, capture and cool antiprotons of 5.3 MeV kinetic energy from the AD to below 100 meV, a catching trap forms the interface between the decelerator and the precision trap system. It features a mesh degrader system of variable thickness with broad energy acceptance, high-voltage electrodes to apply catching pulses, and a five-pole Penning trap with a high-quality image current detection system for measurements of the motional frequencies and resistive cooling.

An extraction scheme for single particles from an antiproton cloud has been developed, which allows to separate and merge fractions of the antiproton cloud without particle loss. Using this scheme BASE will be able to perform precision experiments with antiprotons even in long accelerator shutdown periods.

Results of the commissioning of the catching trap and the BASE apparatus with protons and antiprotons will be presented.