The Isotope Matter Antimatter Experiment

(Payload drawing courtesy of NMSU.)

IMAX is a balloon-borne, superconducting magnet spectrometer experiment designed to measure the galactic cosmic ray abundances of protons, antiprotons, deuterium, helium-3, and helium-4 in the energy range from ~0.2 to ~3.2 GeV/nucleon. It is a collaboration between NASA Goddard Space Flight Center, Caltech Space Radiation Lab, the University of Siegen, New Mexico State University, and the Danish Space Research Institute. The University of Arizona also participated with a piggy-backed dark matter experiment.

For charged particles passing through the payload geometry, IMAX measures magnetic rigidity (via tracking from the drift chambers (DC) and the multiwire proportional counters (MWPC)), charge (via dE/dx from the time-of-flight (TOF) paddles and scintillator counters (S1, S2)), and velocity (via time-of-flight (TOF) and aerogel Cherenkov counters (C2 and C3)). In combination, these three quantities yield particle identification via mass, charge, and charge sign.

IMAX had a successful flight from Lynn Lake, Manitoba, Canada on 16-17 July 1992, attaining a float altitude of about 36 km for a duration of about 16 hours. Over 3 million triggers were recorded.

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    This page maintained by A. Davis
    Last Update: 99-01-04