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We report on the design and characterization of an antiproton decelerationbeamline, based on a pulsed drift tube, for the PUMA experiment at theAntimatter Factory at CERN. The design has been tailored to high-voltage (100kV) and ultra-high vacuum (below $10^{-10}$ mbar) conditions. A first operationachieved decelerating antiprotons from an initial energy of 100 keV down to($3898\pm 3$) eV, marking the initial stage in trapping antiprotons for thePUMA experiment. Employing a high-voltage ramping scheme, the pressure remainsbelow $2\cdot 10^{-10}$ mbar upstream of the pulsed drift tube for 75% of thecycle time. The beamline reached a transmission of ($55 \pm 3$)% forantiprotons decelerated to 4 keV. The beam is focused on a position sensitivedetector to a spot with horizontal and vertical standard deviations of${\sigma}_\mathrm{horiz}$ = ($3.0 \pm 0.1$) mm and ${\sigma}_\mathrm{vert}$ =($3.8 \pm 0.2$) mm, respectively. This spot size is within the acceptance ofthe PUMA Penning trap.

Design and characterisation of an antiproton deceleration beamline for the PUMA experiment