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BASE-STEP demonstrates transportable trap for holding antiprotons

CERN's BASE-STEP experiment built a compact catching trap using 15 stacked electrodes and magnetic confinement to capture antiprotons from a degraded beam, cool them with cotrapped electrons, and clean out contaminant particles like electrons and negative ions through voltage ramping and dipolar drives. The particles are then moved into a compensated Penning trap at the center of the device for stable, non-destructive detection and storage.

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