The CUSP antihydrogen experiment

By measuring precisely the difference between hydrogen and antihydrogen (H) the ASACUSA-CUSP experiment plans to study the fundamental symmetries between matter and antimatter. Therefore the group focuses on spectroscopy of cold antihydrogen atoms. These researches are going on at the Antiproton Decelerator facility in CERN.

Our experimental setup consists of a positron accumulator, a MUSASHI ultraslow antiproton beam source, a CUSP trap, and a hyperfine spectrometer line.

A Penning-Malmberg type multiple ring electrodes (MRE) traps are utilized to prepare slow positrons and antiprotons. They comprise a homogenous strong magnetic field and an electrostatic potential. In order to synthesize H atoms and to produce H beams, a cusp trap consisting anti-Helmholtz coil and an MRE has been developed. Downstream of the cusp trap a hyperfine spectrometer line is placed. It consists of a microwave cavity to induce H spin flips, a sextupole magnet for spin-state analysis and an H detector.