At the LHC, the Large Hadron Collider that will start operating the next year at CERN, proton beams will collide with energies of 7 TeV each. The beams will be composed by several bunches, that will collide in the interacting points with a frequency of about 40 MHz. The CMS experiment (Compact Muon Solenoid), which is one of the two multi-purpose experiments that will take data, will have to cope with such a high interaction rate and reduce it to the order of 100 Hz, that is the constraint given by the persistency on tape. This reducing rate of a factor of O(106) of single events of 2MB size will be achieved in two separate stages: the level one trigger (L1) , implemented by means of hardware devices, and the high-level trigger (HLT) , implemented in a software way on a farm of commercial PCs.
KeywordsLarge Hadron Collider Proton Beam Compact Muon Solenoid Hardware Device Technical Design Report
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