Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 594, Issue 3, Pages 407-419Publisher
ELSEVIER
DOI: 10.1016/j.nima.2008.06.043
Keywords
Fast digitization; FADC; Digital filter; Cherenkov imaging telescopes; gamma-Ray astronomy
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Funding
- German BMBF and MPG
- Italian INFN
- Spanish CICYT
- ETH [TH 34/04 3]
- Polish MNil [1P03D01028]
- ICREA Funding Source: Custom
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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 photoelectrons. (C) 2008 Elsevier B.V. All rights reserved.
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