from 27 February 2017 to 3 March 2017
Budker Institute of Nuclear Physics
Asia/Novosibirsk timezone
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Contribution Contributed Oral

Particle identification

AMS-02 RICH detector in space: status and results


  • Dr. Francesca GIOVACCHINI

Primary authors



AMS-02 is a high-energy particle physics magnetic spectrometer installed on the International Space Station (ISS) in May 2011, succesfully operating and taking data since then. The goal of the experiment is to carry out precise measurements of cosmic rays in the energy range from GeV/n to TeV/n by means of specialized sub-detectors. The Ring Imaging Cherenkov (RICH) provides AMS with a precise measurement of the particle velocity and charge. The AMS-02 RICH layout follows a proximity focusing design with two radiators. The central part of the radiator is formed by 16 sodium fluoride (NaF) tiles with a refractive index n = 1.33, surrounded by 92 tiles of silica aerogel with a refractive index n = 1.05. The challenges and the experience gained operating the detector in space for 5 years will be presented. RICH critical parameters are constantly monitored to ensure detector integrity and optimal performance. The long term stability of the system and the effect of varying environmental conditions will be addressed with special focus on the aerogel radiator. Finally, examples of the use of the RICH detector for the measurement of the isotopic composition of light elements in CR will be shown.