Measured Properties of an Antihydrogen Beam
E. D. Hunter, M. Bumbar, C. Amsler, M. N. Bayo, H. Breuker, M. Cerwenka, G. Costantini, R. Ferragut, M. Giammarchi, A. Gligorova, G. Gosta, M. Hori, C. Killian, V. Kraxberger, N. Kuroda, A. Lanz, M. Leali, G. Maero, C. Malbrunot, V. Mascagna, Y. Matsuda, S. Migliorati, D. J. Murtagh, M. Romé, R. E. Sheldon, M. C. Simon, M. Tajima, V. Toso, S. Ulmer, L. Venturelli, A. Weiser, E. Widmann
公開日: 2025/8/28
Abstract
We report a factor of $100$ increase in the antihydrogen beam intensity downstream of ASACUSA's Cusp trap: $320$ atoms detected per $15$-minute run. The beam contains many Rydberg atoms, which we selectively ionize to determine their velocity and binding energy. The time of flight signal is modeled using a $1\mathrm{D}$ Maxwellian velocity distribution with a temperature of $1500\,\mathrm{K}$, which is close to the measured antiproton plasma temperature. A numerical simulation reproduces the observed distribution of binding energies and suggests that about $16\%$ of the atoms may be in the ground state.