Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..959k&link_type=abstract
Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I
Physics
Scientific paper
The fo cal surface of the EUSO (Extreme Universe Space Observatory) telescope will consist of 5500 multi-ano de photomultipliers (MAPMT). The total number of pixels amounts to 2.105 pixels. The EUSO electronics including both analog and digital front end electronics will be able to cover a dynamic range of 4 order of magnitude, from a fraction of photo electron to about 4000 photo electrons. In the AFEE full version, the ano de pixel channel can accept up to 400 photo electrons per µs and the dyno de channel up to 3750 photo electrons per µs. The gains of MAPMTs and of the electronics can be calibrated with single photo electron spectra while the shutter is closed. Dedicated on board light sources with a justable and controlled intensities will be used to illuminate the internal faces of the shutter covered with diffusing reflectors. Relativistic cosmic upward going protons crossing the glass and the filter of the MAPMTs may also provide physical calibration events. To detect such events, there is possibility in the AFEE design to have at the pixel level a second discriminator with a threshold at around 10 photo electrons. A rate of about 10 counts per hour per pixel with a signal up to few 10 of photo electrons is expected. They may be used for gain stability control or calibration. These measurements will be done also while the shutter is closed and will not reduce the duty cycle. Due to the large number of pixels, a procedure for in flight calibration of photon detectors and front end electonics has to be optimized to reduce time and memory consumption. Besides, the mean photon background viewed by the telescope can be evaluated from the measurement of the 5500 dyno de signal integrals. The photon background survey will provide guidance for the a justement the trigger thresholds.
Bosson G.
Dzahini D.
EUSO Collaboration
Koang D.-H.
Lebrun D.
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