Test results for the Jet/Energy Processor of the ATLAS Level-1 Calorimeter Trigger

The Jet/Energy-sum Processor is one of three processing units of the ATLAS Level-1 Calorimeter Trigger. It identifies and finds the location of jets, and sums total and missing transverse energy information from the trigger data. The Jet/Energy Module (JEM) is the main module of the Jet/Energy-sum Processor. The JEM prototype is designed to be functionally identical to the final production module for ATLAS. Three JEM prototypes have been built and successfully tested. Various input test vector patterns were used to check the performance of the jet and energy summation algorithm. Data communication between adjacent Jet/Energy Modules and all relevant modules of the Jet/Energy-sum Processor has been tested. We present a description of the architecture, required functionality, and jet and energy summation algorithm of the Jet/Energy Module. Recent test results using the JEM prototypes are presented and discussed.