The ZEUS Trigger and Data Acquisition System

The ZEUS trigger system consists of three trigger levels. Events are analyzed by a trigger level and if they pass certain trigger criteria they will be passed on to the next level. With increasing level the precision as well as the complexity of the algorithms applied to the data increases. Table #_#>#7597#>table:trigcomptab gives an overview over the different trigger levels.

Table 5.1: Comparison of ZEUS trigger levels.

Level	Input Rate	Output Rate	Quantities and Algorithms
FLT			coarse gain resolution and
			segmentation, massively parallel,
			dedicated hardware
SLT			full resolution and segmentation,
			massively parallel, software
			programmable algorithms
TLT			full resolution and segmentation,
			complex algorithms