CMS Calorimeter Trigger Circuits

Dasu, S.; Jaworski, M.; Lackey, J.; Panescu, Dorin; Smith, W. H.; Temple, W.

doi:10.1142/9789814447188_0080

Cited by 3 publications

(5 citation statements)

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“…To illustrate the impact of E FG thr on the electron classification, results are presented for two values of E FG thr : 3 and 5 GeV, the latter being the optimal value for electrons energies up to ~50 GeV. All other threshold values determined from previous simulation studies [3,10] seemed reasonable and the reference values were used. The selection cuts used in the study of the L1 algorithm efficiency are summarized in table 1.…”

Section: Electron Selection Efficiency: Resultsmentioning

confidence: 99%

“…A detailed description of the hardware implementation and dataflow of the L1 electron/photon algorithm can be found in refs. [2] and [3]. Here only a brief outline is presented.…”

Section: Summary Of L1 Hardware Implementation and Dataflowmentioning

confidence: 99%

“…The calorimeter system provides triggers based upon the energy profile deposited in the CMS calorimeters by objects such as electrons, photons and jets. The design of the L1 calorimeter algorithms was based on fast detector simulation and validated using full detector simulation [1]. In this note, a first study is presented concerning the estimate of the selection efficiency of the L1 trigger algorithm for electrons using combined ECAL/HCAL test beam data.…”

Section: Introductionmentioning

confidence: 99%

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Study of the electron trigger efficiency of the CMS experiment using test beam data

2007

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A study of the electron identification and selection efficiency of the L1 Trigger algorithm has been performed using the combined ECAL/HCAL test beam data. A detailed discussion of the electron isolation and its impact on the selection efficiency is presented. The L1 electron algorithm is studied for different beam energies and the results indicate that efficiencies of 98% or more can be achieved for electrons with energies between 15 and 100 GeV. The fraction of charged hadrons with energies from 3 up to 100 GeV rejected by the L1 electron trigger algorithm is estimated to be larger than 93%.

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Section: Electron Selection Efficiency: Resultsmentioning

confidence: 99%

“…A detailed description of the hardware implementation and dataflow of the L1 electron/photon algorithm can be found in refs. [2] and [3]. Here only a brief outline is presented.…”

Section: Summary Of L1 Hardware Implementation and Dataflowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study of the electron trigger efficiency of the CMS experiment using test beam data

2007

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“…For the calorimeters local trigger information refers to energy depositions in the trigger towers of the electromagnetic and hadron calorimeters. The Regional Calorimeter Trigger [25,26] then uses these Trigger Primitives to find candidate electrons or photons, jets and isolated hadrons from the decay of τ 's and to calculate transverse energy sums in different detector regions. The jet trigger uses the transverse energy sums of 12×12 electromagnetic and hadronic trigger towers covering a region of ∆η×∆φ = 1.04×1.04.…”

Section: Inputmentioning

confidence: 99%

Concept of the First Level Global Trigger for the CMS experiment at LHC

Wulz

2001

Nuclear Instruments and Methods in Physics Research Section A:

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The requirements, the principles and the design of the First Level Global Trigger Processor of the CMS experiment under construction at the CERN Large Hadron Collider are described. A trigger decision based on trigger objects delivered by the detector subsystems is provided for each beam crossing at a rate of 40 MHz. The Global Trigger comprises a novel concept where event selection is not only based on objects exceeding energy or momentum thresholds but also on complex event topology, which is made possible by the availability of space, charge and quality information in the algorithm calculations. The trigger logic is largely programmable in order to satisfy all possible physics requirements.

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“…High luminosity operation, whether at a collider or with a fixed target, demands complex first level triggers with two relatively new characteristics: pipelined architecture, in order to avoid deadtime during the latency of the first level trigger, and very sophisticated, selective algorithms, in order to suppress high rate backgrounds. The calorimeter trigger electronics under development for the CMS detector [ 19] exemplifies these characteristics, first in the use of detailed Monte Carlo studies to establish physics requirements and to study trigger selection algorithms, and then in its use of state-of-the-art electronics, such as custom GaAs integrated circuits, gigabit per second fiber optics, and 160-MHz point-to-point backplanes. Development of first level triggers for HERA-B [20] and STAR [2l] were also reported.…”

Section: First Level Triggersmentioning

confidence: 99%