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Article
Report number	RD-27 Note 19 ; RAL-93-086
Title	First results from a prototype level-1 calorimeter trigger system for LHC
Author(s)	Brawn, I P (Birmingham U.) ; Carney, R.E. (Birmingham U.) ; Garvey, J. (Birmingham U.) ; Staley, R.J. (Birmingham U.) ; Watson, A.T. (Birmingham U.) ; Eisenhandler, E. (Queen Mary, U. of London) ; Landon, M. (Queen Mary, U. of London) ; Gee, C.N.P. (Rutherford) ; Gillman, A.R. (Rutherford) ; Hatley, R. (Rutherford) ; Perera, V. (Rutherford) ; Ellis, N. (CERN)
Collaboration	RD27
Publication	1993
Imprint	Dec 1993
Number of pages	8
In:	4th International Conference on Calorimetry in High-energy Physics, La Biodola, Italy, 19 - 25 Sep 1993, pp.264-272
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; RD27
Abstract	As part of the RD27 collaboration, we have studied the problem of level-l calorimetric triggering and have developed an algorithm to identify electromagnetic energy clusters. This algorithm has been incorporated into a prototype CMOS Application-Specific Integrated Circuit (ASIC) running as a pipelined processor at up to 67 MHz. In order to verify the operation of the processor in a realistic enviromnent, a multi-ASIC demonstrator system has been constructed and used to instrument small regions of two prototype electromagnetic calorimeters in CERN test beams. We present here details of the demonstrator system and analysis of the data which have been taken so far. The results show that the demonstrator system performs successfully and recognises electromagnetic clusters efficiently at LHC rates. To realise a complete level—1 trigger system several further areas require study. In particular, data bandwidth must be minimised by using sparsification techniques, and I/O requirements reduced by serialisation. These approaches imply the use of asynchronous systems, the features of which we intend to study in the next phase of this work.

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