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The ASACUSA CUSP: an antihydrogen experiment

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Abstract

In order to test CPT symmetry between antihydrogen and its counterpart hydrogen, the ASACUSA collaboration plans to perform high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen atom in-flight. We have developed an apparatus (“cusp trap”) which consists of a superconducting anti-Helmholtz coil and multiple ring electrodes. For the preparation of slow antiprotons and positrons, Penning-Malmberg type traps were utilized. The spectrometer line was positioned downstream of the cusp trap. At the end of the beamline, an antihydrogen beam detector was located, which comprises an inorganic Bismuth Germanium Oxide (BGO) single-crystal scintillator housed in a vacuum duct and surrounding plastic scintillators. A significant fraction of antihydrogen atoms flowing out the cusp trap were detected.

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Correspondence to N. Kuroda.

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Proceedings of the 6th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 2014), Takamatsu, Japan, 1–5 December 2014.

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Kuroda, N., Ulmer, S., Murtagh, D.J. et al. The ASACUSA CUSP: an antihydrogen experiment. Hyperfine Interact 235, 13–20 (2015). https://doi.org/10.1007/s10751-015-1205-1

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  • DOI: https://doi.org/10.1007/s10751-015-1205-1

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