Tile Calorimeter Muon Trigger Signal

The Tile Calorimeter contributes to the first level trigger with the fast analog signal coming from the trigger summing boards, so-called analog adder. The adders provide two kinds of output: the total energy sum in a trigger tower and the signal from the respective cell of the last radial calorimeter layer, which can be used for identifying muons, thus making the muon first level trigger more robust. This note reviews the adder specifications and laboratory tests, whereas the main focus is put on the data analysis from the testbeam periods in~2001. Several improvements achieved by tuning the read-out are described. Using the testbeam results, the ability to identify muons in the last radial Tilecal layer is discussed. The experimental results obtained at the testbeams are completed with the Monte Carlo simulations.