|
|
|
Disclaimer: These pages describe the Global Muon Trigger in use in the Compact Muon Solenoid (CMS) Experiment from 2008 to 2015. The micro Global Muon Trigger (uGMT) , in use in CMS from 2016, is described at:
https://twiki.cern.ch/twiki/bin/viewauth/CMS/L1MicroGlobalMuonTrigger (CMS internal)
Design: Hannes Sakulin, Anton Taurok
Integration: Ivan Mikulec, Tobias Nöbauer
Institute for High Energy Physics of the Austrian Academy of Sciences
|
|
The main task of the Global Muon Trigger is to choose and sort the best four muon candidates from the regional muon triggers and pass them to the L1 Global Trigger together with their parameters.
The functionality must be configurable in order to keep sufficient flexibility necessary to adjust trigger rates to given conditions without a loss in efficiency.
|
|
The Global Muon Trigger fulfils these functions:
- Synchronise incoming muon candidates.
- Merge or suppress duplicate muon candidates.
- Assign rank and quality to outgoing muon candidates.
- Assign MIP and isolation property based on the calorimeter information to outgoing muon candidates.
- Store the information about the input and output muon candidates with event data.
- Provide possibility to insert and read test patterns at the input and output of the module.
|
|
The Global Muon Trigger is implemented on a single 9U VME board located in the L1 Global Trigger crate. The front panel spans over VME 4 slots to accommodate all 16 input connectors.
The logic of the board is programmed in 10 FPGA's mounted each on a separate mezzanine card.
The modul works in a deadtimeless 40 MHz pipeline mode with a latency smaller than 3.2 microseconds
|
|
|
Shortcuts:
Interface
Regional Trs.
Global Tr.
Calo. Tr.
Hardware
Schematics
Firmware
VHDL Build
VHDL Ref
Online SW
Overview
Reference
JTAG Lib
HAL
Configuration
Regs&LUTs
DAQ
RO Record
Performance
MC simulation
|