1. MioctPresenter and CtpmonPresenter
Monitoring Software for the ATLAS L1 Trigger
Timothy Olson
European Organization for Nuclear Research
University of Michigan
Aug 10, 2010

2. Large Hadron Collider (LHC)
Structure
Ring-shaped tunnel with circumference: 27 km (17mi)
Accelerates particles in two beams
Design p energy: 7 TeV/proton (speed = c)
Design Pb energy: 574 TeV/nucleus
Four collision points
Collisions convert energy into
matter which the experiments study
“Beam” split into “Bunches”
25ns spacing
3564 possible bunch locations in
each beam

3. ATLAS Detector
Designed to explore a variety of physics from p-p collisions
More collisions occur than can be recorded
1,000,000,000/s -> 200/s
3 level trigger system
Complex subsystems and triggers require constant monitoring

4. Muon Sectors (Forward, Endcap, Barrel)
Muon detectors
Many interesting processes expected to produce muons
W boson decay
Theoretical Higgs decay
RPC’s and TGC’s ideal for triggering
Fast response
Moderate spatial resolution
MDT’s and CSC’s used for offline analysis
Slow
Accurate and precise
Muon Sectors (Forward, Endcap, Barrel)
TGC and CSC
MDT and RPC

5. L1 Trigger and MioctPresenter
Level 1 (L1) Central Trigger Processor (CTP)
Handles input from several subsystems
MUCTPI (Muon CTP Interface)
L1 Calo
MBTS, etc.
Decides whether to issue L1 Accept
MUCTPI
Processes input from RPC and TGC triggers
Posts monitoring data to ATLAS server in histogram format
MioctPresenter
Retrieves and analyzes MUCTPI data
Presents information in graphical format
Summer project: Upgrade existing presenter with new features

6. Improved Code Readability
Two new objects for data storage
DataManager stores regional BCID data and SlotData objects
SlotData stores information for individual slots
DataManager controls all data storage/retrieval
Histograms retrieved only once per update
MainWindow queries manager for display information
All data is accessed by switch statements and constant “keys”

7. Modified GUI
New color scheme (source: 42°)
More live control over some display parameters
New options
Save, help, and OLD settings
Many new accelerators
Refresh, save, change font size

8. MioctPresenter – New Viewer
Double values and accelerators
Flipped A side wheel
Optimized status check

9. MioctPresenter – New Slot Display
Hide disabled
menu
Choose rate or total
Fixed status checking

10. MioctPresenter – New Slot Display
Show menu when
enabled
Choose rate or total
New histogram
Fixed status checking

11. MioctPresenter – New Timing Display
Lots of information
hidden in these plots

12. MioctPresenter – New Timing Display
Timing analysis (brand new!)
Analyzes regional rate histograms
Queries ATLAS server for bunch pattern (can also read from file)
Paired, Unpaired Beam 1 or 2, or Empty
Shows region and sector timing information
Automatically notes “Anomalous Sectors” (peak signal not at expected BCID or wider than expected)

13. MioctPresenter – New Timing Display
Show only expected
BCIDs +/- N bins

14. MioctPresenter – New Timing Display
Close up on region
Region timing (ideally 0)
Measure of peak width
(ideally close to 0)
Sector Timing
Offset (ideally all 0)

15. MioctPresenter – New Timing Display
Peaks offset by 1-2 bunches
This sector is
anomalous
Very broad (flat) peaks

16. MioctPresenter – New Table
Displays all extracted data plus timing analysis results
Choose to display rate data or total muon data

17. MioctPresenter – New Status Page

18. CtpmonPresenter (brand new!)
CTPMON provides 160 L1-trigger related histograms
Other detector triggers/thresholds
Trigger rate data is available, but not automatically extracted
CtpmonPresenter Features:
User can include/exclude histograms during execution
Summary table of histogram statistics
Display up to six histograms, optionally with timing analysis
Backplane
CTPMON
MUCTPI
(MioctPresenter)
CTPCORE
L1 Accept
L1 Calo L2 OH
MBTS
BPTX, etc…

19. CtpmonPresenter – Summary Tab

20. CtpmonPresenter – Histograms Tab

21. CtpmonPresenter – Histograms Tab

22. Summary MioctPresenter CtpmonPresenter (New!)
Visual display of sector occupancy
Slot and region specific histograms
Timing analysis of each sector (New!)
Data available in tabular format
CtpmonPresenter (New!)
User selected histograms retrieved from server (default: “PTC:*”)
Displays histogram statistics table
Draw up to six of the retrieved histograms with optional timing analysis

23. Acknowledgements Questions? Mark Stockton (Supervisor) Thilo Pauly
ATLAS Control Room Admins
CERN Summer Student Program
University of Michigan
National Science Foundation
Questions?

24. Particle Physics Standard Model
One of the most successful theories to date
Describes an enormous range of phenomena with a small set of particles and forces
Strong, weak, and electromagnetic forces
Three “generations” of particles
Predictions have been measured to very high precision
Also predicts existence of Higgs boson which has yet to be observed

25. MioctPresenter – Original Viewer

26. MioctPresenter – Original Histograms

27. MioctPresenter – Original Histograms

28. MioctPresenter – Original Table

29. MioctPresenter – Original Statuses

30. MioctPresenter New Design GUI Changes
Improved code readability by separating into new objects
Added option to ignore histograms which ceased updating
Added algorithm to generate timing information
Added fifth tab to display all timing data (including previous regional BCID plots)

31. New Display Features Five tabs
Display sector occupancy rates on detector diagram
Display retrieved slot histograms (additional options)
Display new timing analysis histograms
Format histogram data into table (additional options)
Display IS server and histogram statuses (modified format)