CERN Accelerating science

Article
Report number	ATL-DAQ-2003-051
Title	ATLAS Level-1 Calorimeter Trigger : Subsystem Tests of a Prototype Cluster Processor Module
Author(s)	Garvey, J (Birmingham U.) ; Achenbach, R (Kirchhoff Inst. Phys.) ; Apostologlou, P (Rutherford) ; Ay, C (Mainz U., Inst. Phys.) ; Barnett, B M (Rutherford) ; Bauss, B (Mainz U., Inst. Phys.) ; Brawn, I P (Rutherford) ; Bohm, C (Stockholm U.) ; Dahlhoff, A (Mainz U., Inst. Phys.) ; Davis, A O (Rutherford) ; Edwards, J (Rutherford) ; Eisenhandler, E F (Queen Mary, U. of London) ; Gee, C N P (Rutherford) ; Gillman, A R (Rutherford) ; Hanke, P (Kirchhoff Inst. Phys.) ; Hellman, S (Stockholm U.) ; Hidévgi, A (Stockholm U.) ; Hillier, S J (Birmingham U.) ; Jakobs, K (Mainz U., Inst. Phys.) ; Kluge, E E (Kirchhoff Inst. Phys.) ; Landon, M (Queen Mary, U. of London) ; Mahboubi, K (Mainz U., Inst. Phys.) ; Mahout, G (Birmingham U.) ; Meier, K (Kirchhoff Inst. Phys.) ; Meshkov, P (Kirchhoff Inst. Phys.) ; Moye, T H (Birmingham U.) ; Mills, D (Queen Mary, U. of London) ; Moyse, E (Queen Mary, U. of London) ; Nix, O (Kirchhoff Inst. Phys.) ; Penno, K (Kirchhoff Inst. Phys.) ; Perera, V J O (Rutherford) ; Qian, W (Rutherford) ; Schmitt, K (Kirchhoff Inst. Phys.) ; Schäfer, U (Mainz U., Inst. Phys.) ; Silverstein, S (Stockholm U.) ; Staley, R J (Birmingham U.) ; Thomas, J (Queen Mary, U. of London) ; Trefzger, T M (Mainz U., Inst. Phys.) ; Watkins, P M (Birmingham U.) ; Watson, A (Birmingham U.)
Publication	CERN, 2003
Imprint	10 Sep 2003
Number of pages	5
In:	9th Workshop on Electronics for LHC Experiments, pp.230-234
DOI	10.5170/CERN-2003-006.230
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Integration ; Trigger Cluster Processor Module ROD L1A Level1 FPGA
Abstract	The Level-1 Calorimeter Trigger consists of a Preprocessor (PP), a Cluster Processor (CP), and a Jet/Energy-sum Processor (JEP). The CP and JEP receive digitised trigger-tower data from the Preprocessor and produce trigger multiplicity and Region-of-Interest (RoI) information. The trigger will also provide intermediate results to the data acquisition (DAQ) system for monitoring and diagnostic purposes by using Readout Driver (ROD) Modules. The CP Modules (CPM) are designed to find isolated electron/photon and hadron/tau clusters in overlapping windows of trigger towers. Each pipelined CPM processes 8-bit data from a total of 128 trigger towers at each LHC crossing. Four full-specification prototypes of CPMs have been built and results of complete tests on individual boards will be presented. These modules were then integrated with other modules to build an ATLAS Level-1 Calorimeter Trigger subsystem test bench. Realtime data were exchanged between modules, and time-slice readout data were tagged and transferred to the ROD at a trigger rate up to 100 kHz. Tests results have been successful and the CPM's present design is close to the final production design.