CONFINEMENT INSIDE THE MOVING TRAP

voltages turn particles backmagnetic fieldoscillation induces a tiny current

The fields hold the antiprotons in vacuum, away from the apparatus walls. Their shared oscillation produces the electrical signal used to count them.

WHAT THE DETECTOR SAW AFTER THE TRIP

Change in detector-dip width−4−3−2−10 HzIf one antiproton had been lost−3.633 ± 0.016 HzObserved−0.16 ± 0.10 HzChange in detector-dip widthIf one antiprotonhad been lost−3.633 ± 0.016 Hz−4−3−2−10 HzObserved−0.16 ± 0.10 Hz

Bars show one standard uncertainty. The observed uncertainty combines the reported before-and-after measurements.