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AMS-02 Positron Excess: Charge-Sign Spectrometer

Interactive 3D model of the AMS-02 magnetic spectrometer aboard the ISS: fire electrons and positrons through a magnetic field, read their curvature sign, and watch the measured positron fraction converge on the real anomalous excess seen above 10 GeV.

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The Alpha Magnetic Spectrometer (AMS-02) has ridden the International Space Station since 2011, sorting cosmic rays by the sign of their electric charge to hunt for antimatter. This simulator rebuilds its core trick in 3D: a magnetic field bends electrons and positrons in opposite directions, silicon tracker planes read the curvature, and a running Monte Carlo histogram shows how, particle by particle, the measured positron fraction traces out the real anomalous excess — first flagged by PAMELA and confirmed by AMS-02 — that rises unexpectedly above about 10 GeV instead of falling as ordinary cosmic-ray physics predicts.

⚙ Under the hood

Fire electrons and positrons through a 3D model of the AMS-02 magnetic spectrometer aboard the ISS, read their charge sign from the curvature of their tracks, and watch the measured positron fraction converge on the real anomalous excess seen above roughly 10 GeV.

cosmic raysAMS-02particle physicsmagnetic spectrometerantimatterspace station

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install