Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.2927p&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
1
Scientific paper
MAGIC is a 17 m diameter Air Cherenkov telescope located on the Canary island La Palma. A system based on multimo de graded index fibers is currently being used for the transmission of the very fast (2-3 ns FWHM) signals from the 577 photomultiplier imaging camera to the 100 m distant central data acquisition building, where the signals are digitized. Here we report on the concept and the technical details of such system. 2. Introduction MAGIC is a 17 m diameter Imaging Air Cherenkov telescope (see [1,4]) located on El Roque de los Muchachos, at 2200 m a.s.l, in the Canary island of La Palma. The transmission of the very fast pulses (2-3 ns FWHM) produced by the photomultipliers (PMTs) to the 100 m distant central data acquisition building (where the signals are digitized) is performed by multimo de graded index optical fibers. Optical fibers can transfer the signal with smaller attenuation and disp ersion than coaxial cables and besides, they have another important advantages. They are less bulky and one order of magnitude lighter, which reduces the inertia of the telescope and allows a rapid repositioning (necessary for the observation of Gamma Ray Bursts). Many fibers can be packed in a single small diameter cable (we use 72 fibers in a 16 mm φ cable). There is no crosstalk, no electromagnetic interference, and fibers are immune to lightening strikes. The electric pulses produced by the PMTs are transformed into light pulses by means of Vertical Cavity Surface Emitting Lasers (VCSELs) and coupled to multimo de optical fibers (62.5 µm φ core, 125 µm φ cladding) in the camera of the telescope. The optical signals are transformed back into electric pulses by PINdio des in the acquisition building after traveling through 162 m fiber. VCSELs are relatively new devices (they started to be comercialized in 1996) and still have some performance problems when operated in linear mode. Nevertheless there is a steady improvement. We would like to mention that similar analogue signal
Gebauer H.-J.
Lorenz Eckart
MAGIC Collaboration
Martinez Miguel
Mirzoyan Rafayel
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