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Approved Plots from CMS Cosmic Runs (mostly CRUZET, some earlier)

Approved Plots from CMS Cosmic Runs (mostly CRUZET, some earlier). 13-October-2008. MTCC. M agnet T est and C osmic C hallenge. Summer/Autumn 2006. Goals: Test a “vertical slice” of all aspects of final CMS on the surface Commission the CMS magnet Measure the magnet field map. ECAL.

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Approved Plots from CMS Cosmic Runs (mostly CRUZET, some earlier)

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  1. Approved Plots from CMS Cosmic Runs (mostly CRUZET, some earlier) 13-October-2008

  2. MTCC Magnet Test and Cosmic Challenge Summer/Autumn 2006 • Goals: • Test a “vertical slice” of all aspects of final CMS on the surface • Commission the CMS magnet • Measure the magnet field map ECAL Magnet HCAL Tracker Muon chambers barrel & endcap 2 Cosmic Results

  3. Golden MTCC event HCAL ECAL Tracker HCAL Run 2605 / Event 3981 / B=3.8 T / 27.08.06, 22hMuon traversing DT, RPC, HCAL, ECAL, Tracker Cosmic Results

  4. Cosmic Muon Measurements  B=0  B=4T Behavior of detectors in the magnetic field was verified using MC and physical observables Momentum Distribution (4T) CMS NOTE-2008/016 Cosmic muon charge ratio measurement from MTCC 4 Cosmic Results

  5. Measured during MTCC ‘06 Finite element calculation of field in entire detector volume performed (at 2, 3, 3.5, 3.8, 4 T) Field map with 12-fold phi-symmetry provided for physics Analysis of field mapper data: Calibration corrections of order 10-4 in gain and offset derived, to produce field model that agrees better than 5*10-5 with measurements and with Gauss' law in tracker volume (note: original calibration ~5*10-4 !) [PhD thesis V.Maroussov, Purdue University, May 2008.] Field map 3.8T map δBz (T) • ... R (m) B = 0 ∆ Z (m) Cosmic Results

  6. Global Runs • Subdetectorand trigger considered separately - 19 items, each equally weighted - box size represents approx. fraction included (25%, 50%, 75%, 100%) • With exception of some parts of RPC, allCMS detector and trigger system ready for LHC ALL CMS with exception of ½ RPCE % CMS Reached scale of ’06 Magnet Test & Cosmic Challenge Muon Tracks in Si-Strip Tracker Final DAQ hardware,final services Start of full week exercises (CRUZET 1) First  coincidence of 2 subsystems Upgrade to final DAQ software architecture First cosmic muon triggers underground Cosmic Results 6

  7. Fraction of CMS Systems in Global Runs Pixel system and ECAL endcaps installed Muon Cabling complete, final power & cooling become available Cooling ready for Strip Tracker Cosmic Results

  8. Events collected by CMS in global runs during 2008 “Integrated (cosmics) luminosity” Cruzet4 September 10 Cruzet3 Cruzet2 Cruzet1 DAYS after March 31, 2008 Cosmic Results

  9. DT Cosmic Muon Movie Cosmic Results

  10. CRUZET: Cosmic Muon Coincidence HCAL ECAL DT and RPC Cosmic Results

  11. CRUZET: showering muon Energy: ~290 GeV Cosmic Results

  12. Tag & Probe with cosmics z (at surface) [cm] x (at surface) [cm] • TOF-compensated cosmic trigger: di-muon-like signal in DT • Probe muon trigger and reconstruction Probability to find at least one segment at the probe side “X-ray” image of the shaft using cosmic rays BOTTOM TOP Cosmic rays extrapolated to the surface (80m) Cable chimney  Soft muons absorbed linear scale Not read-out  [deg] 12 Cosmic Results

  13. Cosmic signal is reconstructed as cluster in 5x5 region with seed crystal(s) above a threshold (~100 MeV) 2M events selected from 13.6M logged events (15% of muon triggers) 61K crystals, O(100) events/crystal in top-bottom regions Supermodules intentionally left susceptible to noise for diagnosis HV problem caught by prompt analysis team CRUZET ECAL Barrel Occupancy Masked trigger tower EB+ EB- TOP BOTTOM Cosmic Results

  14. ECAL Reconstructed clusters matching muon tracks Cluster Energy [GeV]  in detector units (DT triggered events)  in detector units 3x3 energy deposit for cosmic muons – confirms absolute energy scale to few % Trigger acceptance Trigger acceptance GeV/cm Track-cluster association m trigger: 290 GeV cluster! • e/ trigger tested by triggering on m.i.p. signal • synchronized to muon & HCAL triggers I. Mikulec 14 Cosmic Results

  15. CRUZET3 Global Tracks: Tracker + Drift Tubes Prerequisites: infrastructure, -trigger, DAQ integration, r/o synchronization, muon calibration, reconstruction/tracking, etc. ... Global Run Jul08 Muon System Tracker ECAL HCAL Tracker 15 Cosmic Results

  16. CRUZET3: Global Tracks Muon System • Di-muon Trigger: • Drift-Tube coinc. in top+bottom, each  2 station segments • Muon signals traced through • muon system • Tracker TOB+TIB • ECAL • HCAL • Global track fit • Data being used for alignment ECAL Tracker HCAL 16 Cosmic Results

  17. CRUZET4: Endcap ECAL Cosmic Results

  18. CRUZET4: ECAL Endcap Cosmic Results

  19. CRUZET4: Endcap ECAL End of Aug08 – Endcap ECAL part of Global Runs DT Barrel ECAL Endcap ECAL HCAL 19 Cosmic Results

  20. Tracker/Pixel Aug08: all parts of Tracker integrated First cosmic tracks with Pixels Pixel 20 Cosmic Results

  21. Routinely running High-Level-Trigger menu (+ dedicated cosmic muon trigger path)‏ Global fit with “L3” tracker track, seeded from “L2” muon track, seeded from “L1” trigger candidate: Testing the muon High-Level Trigger 0T Run 58733, event 1741135 Cosmic Results

  22. Part of the standard muon ID 90k events with tracker track (B off)‏ Tracker tracks are extrapolated outward and matched to Muon segments Calorimeter deposits Standard MuonID sequence (Cruzet III)‏ No. of matched segments Calorimeter only! 0T Muon compatibility Δx between track extrapolation and muon segment in station 1 (cm)‏ Cosmic Results

  23. 0.02% rate of events with >100 segments in ~10M cosmic events at 0T Event-by-event spread in phi compatible with multiple scattering → all events compatible with ~parallel muon shower Cosmic Shower Events: Cosmic Results

  24. Analyzed events spanning 5 orders of magnitude in muon multiplicity ! illustrates versatility and robustness of detector and software Muon multiplicity Run 50908 event 1057286 541 segments • ... • ... • ... Cosmic / Beam Halo O(1) muon Cosmic Shower O(10-100) muons Beam “splash” event O(105) muons Analysis using: tracks ... segments ... hits cosmic charge ratio shower origin shower energy and shape Cosmic Results

  25. Navigation + seeding optimized for cosmic and beam halo muons not pointing at IP, traversing whole CMS using default propagator + Kalman Filter fit, updated to work both with B on and off Dedicated muon reconstruction CMS Note -2008/001 3.1 GeV 25 6.2 GeV 38.1GeV 3T 8.1 GeV 12.6GeV Cosmic Results

  26. Measuring the momentum: Using centrally RECOed data from run 60302: Cosmic-Muon Momentum Spectra Short run at 3T Tracker only Muon system Only Momentum (GeV/c)‏ Momentum (GeV/c)‏ Cosmic Results

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