CERN Accelerating science

ATLAS Slides
Report number	ATL-DAQ-SLIDE-2012-520
Title	The Upgrade of the PreProcessor System of the ATLAS Level-1 Calorimeter Trigger
Author(s)	Andrei, V
Corporate author(s)	The ATLAS collaboration
Submitted to	Topical Workshop on Electronics for Particle Physics, Oxford, UK, 17 - 21 Sep 2012
Submitted by	victor.andrei@cern.ch on 14 Sep 2012
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	The ATLAS Level-1 Calorimeter Trigger is a pipelined system to identify high-pT objects and to build energy sums within a fixed latency of ~2 us. It consists of a PreProcessor, which conditions and digitises analogue calorimeter signals, and two object-finding processors. The PreProcessor's tasks are implemented on a Multi-Chip Module, holding ADCs, time-adjustment and digital processing ASICs, and LVDS serialisers. A pin-compatible substitute, based on today's technology, like dual-channel ADCs and FPGAs, has been built to improve the BCID and pedestal subtraction algorithms. Test results with the first prototype are presented.