The RICH counter of the AMS experiment
For the AMS RICH collaboration 1
Institut des Sciences Nucleaires, IN2P3/CNRS, 53 av.
des Martyrs, 38026 Grenoble cedex,
The RICH counter of the AMS experiment will
provide the mass identification of Cosmic Ray (CR) isotopes of
astrophysical interest, over a wide range of momentum, up to about 12 GeV
per nucleon for isotopes around 12C. In addition it will
contribute to the e-(e+) vs p(p)
A second generation prototype incorporating the
final choice of the basic components for the photodetection and the data
processing (16 pixel multianode photomultiplier tubes (PMT), dedicated
multiplexed readout and DSP based DAQ electronics) has been built and is
currently being tested. The photodetector prototype matrix is made of 96
PMTs in approximately square geometry. Each PMT is enclosed in a plastic
shell with its (16-fold) light guide system and readout electronics. The
shell is housed and held in a shielding cell. The mechanical mounting of
the modules is close to the final design.
The tests are being performed with two Silica
aerogel (AGL) radiators with refractive index 1.03 and 1.05, and a Sodium
Fluoride radiator. Some first results (AGL 1.03) are currently available.
The contribution will include a general
presentation of the RICH in the context of the AMS project, and a
description of the prototype setup. The results obtained for CR. particles
will be presented and compared with the simulation results. The
forthcoming beam tests schedule at CERN on next Fall will also be
1 INFN Bologna, ISN Grenoble, CIEMAT Madrid,
U. Maryland, UNAM Mexico.