| CMS Note | |
| Report number | CMS-NOTE-2010-017 |
| Title | The Central Trigger Control System of the CMS Experiment at CERN |
| Author(s) | Taurok, Anton (Vienna, OAW) ; Arnold, Bernhard (Vienna, OAW) ; Bergauer, Herbert (Vienna, OAW) ; Eichberger, Markus (Vienna, OAW) ; Ero, J (Vienna, OAW) ; Hartl, Christian (Vienna, OAW) ; Jeitler, Manfred (Vienna, OAW) ; Kastner, Kurt (Vienna, OAW) ; Mikulec, Ivan (Vienna, OAW) ; Neuherz, Barbara (Vienna, OAW) ; Padrta, Michael (Vienna, OAW) ; Sakulin, Hannes (CERN) ; Strauss, Josef (Vienna, OAW) ; Wulz, Claudia-Elisabeth (Vienna, OAW) ; Varela, Joao (Lisbon, LIFEP) ; Smith, W H (Wisconsin U.) |
| Publication | 2010 |
| Imprint | 17 May 2010 |
| Number of pages | 13 |
| Subject category | Detectors and Experimental Techniques |
| Accelerator/Facility, Experiment | CERN LHC ; CMS |
| Keywords | Trigger |
| Abstract | The Large Hadron Collider delivers up to 32 million physics collisions per second. This rate is far too high to be processed by present-day computer farms, let alone stored on disk by the experiments for offline analysis. A fast selection of interesting events must therefore be made. In the CMS experiment this is implemented in two stages: the Level-1 Trigger of the CMS experiment uses custom-made, fast electronics, while the experiment's high-level trigger is implemented in computer farms. The Level-1 Global Trigger electronics has to receive signals from the subdetector systems that enter the trigger (mostly from muon detectors and calorimeters), synchronize them, determine if a pre-set trigger condition is fulfilled, check if the various subsystems are ready to accept triggers based on information from the Trigger Throttling System and on calculations of possible dead-times, and finally distribute the trigger (``Level-1 Accept'') together with timing signals to the subdetectors over the so-called ``Trigger, Timing and Control'' distribution tree of the experiment. These functions are fulfilled by several specialized, custom-made VME modules, most of which are housed in one crate. The overall control is exerted by the central ``Trigger Control System'', which is described in this paper. It consists of one main module and several ancillary boards for input and output functions. {\bf Keywords:} Trigger concepts and systems (hardware and software), Digital electronic circuits |
| Other source | Inspire |
| Copyright/License | Preprint: (License: CC-BY-4.0) |
Záznam vytvorený 2011-01-06, zmenený 2018-06-14
