1. LHC Collisions

2. Trigger & DAQ at the LHC

3. CMS Computing - Tier-2 Tier 0 Tier 1 Tier 2
CERN/Outside Resource Ratio ~1:2 Tier0/( Tier1)/( Tier2) ~1:1:1
~PByte/sec
Online System
~ MBytes/sec
Experiment
CERN Center PBs of Disk; Tape Robot
Tier 0
Tier 1
IN2P3 Center
RAL Center
FNAL Center
INFN Center
10 Gbps
Tier 2
Wisconsin
Florida
Caltech
UCSD
Tier-2 Resources in Open Science Grid
Compute Servers ~500 CPUs per Tier-2 Bulk of MC Simulation
Physics User Support ~100 Users per Tier-2
Physics data cache ~200 TB storage per Tier-2

4. CMS Detector 4

5. CMS Trigger & DAQ Systems
Detector Front-ends
Level-1
Trigger
Readout
Event
Switch Fabric
Controls
Manager
Farms
Computing Services
Level-1 Trigger
LHC beam crossing rate is 40 MHz & at full Luminosity of 1034 cm-2s-1109 collisions/s
Reduce to 100 kHz output to High Level Trigger and keep high-PT physics
Pipelined at 40 MHz for dead time free operation
Latency of only 3.2 msec for collection, decision, propagation 5

6. The CMS Level-1 Trigger & Regional Calorimeter Trigger
Only calorimeter and muon systems participate in CMS L1
3<||< ||< ||< ||< <||< ||<1.2
4K 1.2 Gbaud serial links Cu cables
e/, jets,
ET, HT,
jet counts
muons
Regional Calorimeter Trigger
Receives Trigger Primitives (TPs) from 8000 ECAL/HCAL/HF towers
Finds 28 e/g candidates, creates 14 central tower sums, 28 quality bits, and forwards 8 HF towers and 8 HF quality bits
All sent to Global Calorimeter Trigger at 80 MHz on SCSI cables

7. Calorimeter Trigger Crate built by U. Wisconsin
One of MHz systems processing 0.4 Tbits/s.

8. UW Designed Endcap disks support muon chambers and calorimeters
9/18/2018
UW Designed Endcap disks support muon chambers and calorimeters

9. UW Tier-2 Computing Center