ClusterAlg.gif (577 bytes) The ATLAS Level-1 Calorimeter Trigger

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TDR Updates - External Systems

This page provides information on changes made to external systems affecting the calorimeter trigger design  after submission of the TDR. Information on changes to TDR Algorithms and Technologies is also available.

TileCal receivers and conversion to missing-ET

TDR - page 82-83 (,,  122 (fig 6-4, Updated Version
Signals were received and converted to ET in Preprocessor line receivers. Now done using Receiver Stations, similar to Liquid Argon calorimeters. The TileCal Receiver stations are the responsibility of the Calorimeter Trigger group
Presented: Heidelberg Minutes 11/98, Birmingham Minutes 3/99, P. Hanke
Status: Proposal agreed by Calorimeter Trigger Group


FCAL modularity

TDR - Pages  96 (5.2.4),   117 (6.1.1), 122 (fig 6-4) Updated Version
FCAL modularity was 32 in phi by 2 in eta, summed over e.m. and hadronic, for each endcap. The total number of signals was therefore 128. Modularity is now 16 in phi by 4 in eta for each endcap. There are no Tower Builder cards. E.M. and hadronic signals are not summed. Hadronic signals are divided in depth between FCAL2 and FCAL3; these are summed in the Receiver Stations. Thus the total number of FCAL signals is now 384 into the Receiver Stations and 256 into the Preprocessor. After summing into pseudo-jet elements in the Preprocessor, the number of signals to the Jet/Energy-sum Processor is 16 in phi by 1 in eta, with e.m. and hadronic separate, for each endcap. The total number of elements is therefore 64.
Presented: Birmingham Minutes 3/99, P. Hanke
Status: Proposal agreed by Calorimter Trigger and FCAL Groups. 

This page was last updated on 16 December, 2013
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