DocumentCode
1422607
Title
A 40 MHz pipelined trigger for K0→2π0 decays for the CERN NA48 experiment
Author
Gorini, B. ; Avanzini, C. ; Barr, G.D. ; Calafiura, P. ; Cirilli, M. ; Costantini, F. ; Cundy, D. ; Dibon, H. ; Fischer, G. ; Formenti, F. ; Hallgren, B. ; Iwanski, W. ; Jeitler, M. ; Kapusta, P. ; Laico, F. ; Laverriere, G. ; Magazza, G. ; Markytan, M. ;
Author_Institution
Ist. Nazionale di Fisica Nucl., Pisa, Italy
Volume
45
Issue
4
fYear
1998
fDate
8/1/1998 12:00:00 AM
Firstpage
1771
Lastpage
1775
Abstract
A first level trigger system based on a 40 MHz digital pipeline has been developed for the CERN NA48 experiment, aiming at measuring CP violation in K0→2π decays. The outputs of the 13340 cells of the 10 m3 liquid krypton calorimeter are summed into 64 X and 64 Y projection strips and continuously digitised with 40 MHz FADCs. This information is used to reconstruct at each clock cycle and for the two calorimeter projections, the number of clusters, the impact time of each of them (with a precision of about 3 ns), their total energy and the first and second moments of the energy distribution. Based on the quantities listed above, a programmable look-up table system subsequently computes online the longitudinal position of the kaon decay vertex and performs an event selection. The system is described
Keywords
analogue-digital conversion; calorimeters; energy loss of particles; high energy physics instrumentation computing; liquid scintillation detectors; nuclear electronics; pipeline processing; real-time systems; trigger circuits; 40 MHz; CERN NA48 experiment; CP violation; FADC; calorimeter projections; digital pipeline; energy distribution; event selection; first level trigger system; kaon decay vertex; kaon0 decay into pion0+pion0; liquid Kr calorimeter; longitudinal position; pipelined trigger; programmable lookup table system; projection strips; Buffer storage; Clocks; Collaboration; Detectors; Geometry; Mesons; Pipelines; Statistics; Strips; Table lookup;
fLanguage
English
Journal_Title
Nuclear Science, IEEE Transactions on
Publisher
ieee
ISSN
0018-9499
Type
jour
DOI
10.1109/23.710934
Filename
710934
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