Readout System for the CMS RPC Muon Trigger
The CMS detector contains the RPC chambersa dedicated trigger subdetectorto identify muons, measure their transverse momenta pT, and determine the bunch crossing from which they originated.The RPC Muon Trigger algorithm is based on muon track search and classification in raw data from the RPC chambers. Large part of the RPC trigger electronics will reside in the control room (approx. 90 meters from the detector) where all trigger data are concentrated. Dedicated synchronous compression decompression algorithm is needed to sent all data for each bunch crossing via optical links. The RPC Readout system uses the same data as Trigger system and will be placed in the Trigger Racks. The idea of readout system and its limitations are discussed below. The paper includes description of prototype boards and tests in the synchronous CERN LHC like test beam H2 in May 2000.
Resistive Plate Chamber (RPC) based muon trigger system for the CMS experiment – data compression/decompression system
Abstract The CMS detector will have a dedicated subdetector (RPC chambers) to identify muons, measure their transverse momenta pt, and determine the bunch crossings from which they originate. The trigger algorithm is based on muon track search and classification in raw data from the RPC chambers grouped in the four muon stations in the CMS magnet yoke. A huge interconnection network is needed to fulfill this task. It can be built in the control room only, approximately 120 m away from the detector. The data compression/decompression system is proposed to reduce the number of links needed to transfer the data from detector to control room. The idea of such a system and results of first tests will be presented.
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