Physics – Medical Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apsp.conf..994m&link_type=abstract
ASTROPARTICLE, PARTICLE AND SPACE PHYSICS, DETECTORS AND MEDICAL PHYSICS APPLICATIONS. Proceedings of the 10th Conference. Held
Physics
Medical Physics
Scintillating Fiber, Tracker, Antiproton Annihilation
Scientific paper
A novel tracking detector (FAST, Fiber Antiproton Scintillating Tracker) has been developed for the measurement of the annihilation cross section of slow antiprotons at the CERN Antiproton Decelerator. FAST has to reconstruct the charged pion tracks produced in the antiproton annihilation in gaseous and solid targets. The cylindrical (diameter: 30 cm, length: 50 cm) detector consists of 2 axial and 4 stereo layers of 1 mm BCF-10 scintillating fibers readout by 42 multianode photomultipliers (64 channels) whose signals are amplified and discriminated by the VA64TAP2.1+LS64 VLSI ASICs and sampled at 320 MHz by a Cyclone II Altera FPGA. The fast sampling allows to distinguish annihilation events at the ns level as required by the pulsed nature of the AD beam (106bar {p} in a 40 ns bunch for 6 bunches every 110 s).
The paper describes the detector design, its commissioning with cosmic rays and its performance in the 2007 data taking.
Bolognini D.
Corradini Massimiliano
Leali M.
Lodi-Rizzini E.
Mascagna V.
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