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IEEE Transactions on Nuclear Science 55 (2008) 91-98
Global Trigger and Readout System for the AGATA Experiment
M. Bellato, L. Berti, D. Bortolato, P.J. Coleman-Smith, P. Edelbruck1, X. Grave1, R. Isocrate, I. Lazarus, D. Linget1, P. Medina2, C. Oziol1, G. Rampazzo, C. Santos2, B. Travers1, A. Triossi
AGATA Collaboration(s)

AGATA is a 4-pi array of high purity Ge detectors for in-beam gamma-ray spectroscopy based on the novel concepts of pulse shape analysis (PSA) and gamma-ray tracking. Tracking and PSA require the concurrent digitization—at a sampling rate of 100 Msamples/s—of preamplifier signals of the 36-fold segmented Ge crystals composing the array. Locally digitized data are optically transferred to remote pre-processing nodes for pulse energy computation. The design of the front-end readout and level-1 (L1) trigger in AGATA follows a synchronous pipeline model: the detector data are stored in pipeline buffers at the global AGATA frequency, waiting the global L1 decision. A global timing system provides a reference clock and time tag to the digitizers and the pre-processing units by means of a tree of optically connected timing units. Pre-processing nodes are integrated in AdvancedTCA-based carrier cards with full mesh connectivity in the backplane and read-out through pci-express based optical links. The front-end data readout and its integration in the global trigger and synchronization system will be described
1 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 :  DRS-IPHC - Département Recherches Subatomiques
Physique/Physique Nucléaire Expérimentale
AdvancedTCA – Pci-Express – digital trigger – distributed synchronization – full mesh readout