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As the Tevatron luminosity increases sophisticated selections are required tobe efficient in selecting rare events among a very huge background. To copewith this problem, CDF has pushed the offline calorimeter algorithmreconstruction resolution up to Level 2 and, when possible, even up to Level 1,increasing efficiency and, at the same time, keeping under control the rates.  The CDF Run II Level 2 calorimeter trigger is implemented in hardware and isbased on a simple algorithm that was used in Run I. This system has worked wellfor Run II at low luminosity. As the Tevatron instantaneous luminosityincreases, the limitation due to this simple algorithm starts to become clear:some of the most important jet and MET (Missing ET) related triggers have largegrowth terms in cross section at higher luminosity. In this paper, we presentan upgrade of the Level 2 Calorimeter system which makes the calorimetertrigger tower information available directly to a CPU allowing moresophisticated algorithms to be implemented in software. Both Level 2 jets andMET can be made nearly equivalent to offline quality, thus significantlyimproving the performance and flexibility of the jet and MET related triggers.However in order to fully take advantage of the new L2 triggering capabilitieshaving at Level 1 the same L2 MET resolution is necessary. The new Level-1 METresolution is calculated by dedicated hardware. This paper describes thedesign, the hardware and software implementation and the performance of theupgraded calorimeter trigger system both at Level 2 and Level 1.

Level-3 Calorimetric Resolution available for the Level-1 and Level-2 CDF Triggers