Antiproton Confinement in a Penning-Ioffe Trap for Antihydrogen

Antiprotons ($\overline{p}$) remain confined in a Penning trap, in sufficient numbers to form antihydrogen ($\overline{\mathrm{H}}$) atoms via charge exchange, when the radial field of a quadrupole Ioffe trap is added. This first demonstration with $\overline{p}$ suggests that quadrupole Ioffe traps can be superimposed upon $\overline{p}$ and $e^{+}$ traps to attempt the capture of $\overline{\mathrm{H}}$ atoms as they form, contrary to conclusions of previous analyses.