Tests of the Cms-Ecal Trigger Primitive Generation

We describe the On-detector Level-1 Trigger Logic associated with the CMS electromagnetic calorimeter. The purpose of this system is to reduce the acquisition rate from 40 MHz -- the LHC bunch crossing frequency -- down to a maximum rate of 10⁵ Hz. In order to take its decisions, the Level-1 Trigger relies on trigger primitives, i.e. summary information sent by the calorimeters and the muon detectors. The trigger primitives delivered by the CMS electromagnetic calorimeter are computed on the detector by a dedicated radiation-hard electronics. In this paper, we describe the Trigger Primitive Generation pipeline, and we present the first results obtained from the beam tests of the first prototypes.