Author/Authors :
Albert، نويسنده , , J. and Aliu، نويسنده , , E. and Anderhub، نويسنده , , H. and Antoranz، نويسنده , , P. and Armada، نويسنده , , A. and Asensio، نويسنده , , M. and Baixeras، نويسنده , , C. and Barrio، نويسنده , , J.A. and Bartko، نويسنده , , H. and Bastieri، نويسنده , , D. and Becker، نويسنده , , J. and Bednarek، نويسنده , , W. and Berger، نويسنده , , K. and Bigongiari، نويسنده , , C. and Biland، نويسنده , , A. and Bock، نويسنده , , R.K. and ، نويسنده ,
Abstract :
Until April 2007 the Major Atmospheric Gamma ray Imaging Cherenkov (MAGIC) telescope used a 300 MSamples/s flash analog-to-digital converter (FADC) system to sample the shaped photomultiplier tube (PMT) signals produced by the captured Cherenkov photons of air showers. Different algorithms to reconstruct the signal from the read-out samples (extractors) have been implemented and are described and compared. Criteria based on the obtained charge and time resolution/bias are defined and used to judge the different extractors, by applying them to calibration, cosmic and pedestal signals. The achievable charge and time resolution have been derived as functions of the number of incident photo-electrons.
Keywords :
Fast digitization , fADC , digital filter , Cherenkov imaging telescopes , ? -ray astronomy
