2-7 May 2010
Oustau Calendal Conference Center
Europe/Paris timezone
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The AMS~02 RICH detector: performance during ground-based data taking at CERN

3 May 2010, 17:30
Oustau Calendal Conference Center

Oustau Calendal Conference Center

Cassis, France
Oral presentation Cherenkov detectors in astroparticle physics Cherenkov detectors in astroparticle physics


Mr Rui Pereira (LIP Lisbon)


The Alpha Magnetic Spectrometer (AMS), whose final version AMS 02 is to be installed on the International Space Station (ISS) later this year, is a detector designed to measure charged cosmic ray spectra with energies up to the TeV region and with high energy photon detection capability up to a few hundred GeV, using state-of-the art particle identification techniques. Among several detector subsystems, AMS includes a proximity focusing RICH detector enabling precise measurements of particle electric charge (charge identification up to the iron region) and velocity (dbeta/beta ~ 10^-3 for Z=1, ~ 10^-4 for Z=10-20). The optimization of the RICH reconstruction efficiency imposed a dual radiator configuration with 16 NaF tiles (n=1.33) in the center and 92 aerogel tiles (n=1.050) surrounding, a pixelized detection matrix with 680 Hamamatsu R7600-M16 photomultipliers (4x4 pixels) and a highly reflective conical mirror to increase photon collection. After the RICH detector assembly at CIEMAT (Madrid), it was taken to CERN where it was integrated in the full AMS 02 detector. AMS 02 underwent a pre-assembly in 2008 without its superconducting magnet before the final detector assembly which took place during 2009. Cosmic events were acquired in the context of the 2008 pre-assembly and final assembly, this time including the superconducting magnet, and a beam test from CERN SPS took place in February 2010. Results obtained with data from ground-based tests on the RICH performance are presented. A comparison with the aerogel light yield obtained on previous beam tests with a prototype detector is also discussed.
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Primary author

Mr Rui Pereira (LIP Lisbon)

Presentation Materials