Cold Antihydrogen
Prof. Dr. J. Walz (Institut für Physik, Mainz)

Cold antihydrogen has been produced at CERN's Antiproton Decelerator (AD) by mixing trapped antiproton and positrons. This talk will discuss experiments of the ATRAP collaboration. The internal structure of antihydrogen atoms has been probed and their velocity has been measured.

Future high-resolution laser-spectroscopy of antihydrogen in a magnetic trap can provide extremely precise tests of the fundamental symmetry between matter and antimatter (CPT symmetry). Yet another exciting long-term perspective is that ultra-cold antihydrogen atoms might enable the first measurement of the gravitational acceleration of antimatter.

The proposed "Facility for Low-energy Antiproton and Ion Research" (FLAIR) includes a next-generation antiproton source of cooled intense beams in an unprecedented range of low energies. This will allow a large variety of new experiments to be performed and is also ideal for both types of fundamental antihydrogen experiments.