Measuring the Properties of Antihydrogen


This thesis describes the latest results of the on-going efforts to measure the properties of antihydrogen within the ALPHA collaboration. More specifically, it covers the construction and commissioning of the ALPHA-g experiment [1], and the plans to measure how antimatter behaves in Earth’s gravitational field. A special emphasis is on the ALPHA-g magnet system used to confine and manipulate the antihydrogen atoms. Tests of methods for calculating magnetic fields relevant for simulations [2] are covered as well. Amongst the described results from the ALPHA-2 experiment is the characterisation of the fine structure of antihydrogen [3]. The combined result of the measured 1S–2P1/2 and 1S–2P3/2 transitions agrees with the prediction of quantum electrodynamics to 16 parts per billion. The thesis also describes the demonstration of the first laser cooling of antimatter [4], which paves the way for a measurement of the 1S–2S transition in antihydrogen with hydrogen-like precision, and a measurement of antigravity with 1% precision. Both are future goals of the ALPHA collaboration.

Peter Granum


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