Speaker
Description
Antihydrogen experiments hosted at CERN's Antiproton Decelerator rely on charge exchange [1] or three body recombination [2] formation mechanisms. In both cases, the anti-atoms are produced in a wide range of highly excited Rydberg states preventing the atoms' extraction through Stark acceleration or magnetic focusing into a field-free environment and consequently hindering spectroscopy or gravity measurements in a beam. I will discuss novel approaches to enhance the decay of the initially formed Rydberg levels toward the ground state. Mixing states either via crossed electric and magnetic fields [3] or impinging THz and/or microwave light [4] allows to efficiently employ deexcitation lasers and achieve close to unity ground state fractions in a few tens of microseconds which is compatible with experimental requirements. Results of a technology demonstration of cesium Rydberg state mixing with THz photomixing [5] will be discussed in the context of antihydrogen deexcitation. Finally, developments of a Rydberg hydrogen beam for a proof-of-principle experiment will be presented.
[1] Amsler, C., Antonello, M. et al. Pulsed production of antihydrogen, Commun. Phy. 4, 19 (2021)
[2] Kuroda, N., Ulmer, S., Murtagh, D. et al. A source of antihydrogen for in-flight hyperfine spectroscopy, Nat Commun 5, 3089 (2014)
[3] D. Comparat and C. Malbrunot. Stimulated decay and formation of antihydrogen atoms, Phys. Rev. A 99, 013418 (2019)
[4] T. Wolz, C. Malbrunot, M. Vieille-Grosjean, and D. Comparat. Stimulated decay and formation of antihydrogen atoms, Phys. Rev. A 101, 043412 (2020)
[5] M. Vieille-Grosjean, E. Dimova, Z. Mazzotta, D. Comparat, T. Wolz and C. Malbrunot. Induced THz transitions in Rydberg caesium atoms for application in antihydrogen experiments, Eur. Phys. J. D 75:27 (2021)
Details
Tim Wolz, CERN, Switzerland
| Is this abstract from experiment? | Yes |
|---|---|
| Name of experiment and experimental site | AEGIS and ASACUSA collaboration, CERN |
| Is the speaker for that presentation defined? | Yes |
| Internet talk | Maybe |
