1. Approved Plots from CRAFT
17-December-2008
Note that slides with remarks in green are conditionally approved, and changes are requested.
Note due to lack of time, some results and the beam halo alignment were not approved
Note that earlier CRUZET and First Beam approved material has been collected here:

2. Event Displays

3. Approved CRAFT Results
CRAFT Event Displays
ECAL in magenta, HCAL in blue, tracker and muon hits in green
Approved CRAFT Results

4. Approved CRAFT Results
Opposite charge
ECAL in magenta, HCAL in blue, tracker and muon hits in green
Approved CRAFT Results

5. Traversing Pixel Detector
ECAL in magenta, HCAL in blue, tracker and muon hits in green
Approved CRAFT Results

6. Endcap and Barrel Muon Detectors
ECAL in magenta, HCAL in blue, tracker and muon hits in green
Approved CRAFT Results

7. A CSC-RPC-Tracker Muon
RPC chambers in red, CSC strips in yellow, CSC wires in magenta
Tracker and muon hits in green
Approved CRAFT Results

8. Approved CRAFT Results
CRAFT Slideshow
Approved CRAFT Results

9. Statistics

10. Cosmic Run at Four Tesla (CRAFT)
Aims:
Run CMS for 4 weeks continuously to further gain operational experience this year
Study effects of B field on detector components (since MTCC)
Collect 300M cosmic events with tracking detectors and field
Aim for 70% efficiency
Facts:
Ran 4 weeks continuously from 13-Oct to 11-Nov
19 days with B=3.8T
370M cosmic events collected in total
290M with B=3.8T and with strip tracker and DT in readout
194M with all components in
4 runs exceed 15h
Oct.21 VIP visit
Approved CRAFT Results

11. Prompt Reconstruction
Prompt reconstruction of runs at T0 took a typical latency of ~6h
A total of ~20 datasets produced
AlCaReco skims produced with a latency of ~12h (more later)
Data skims produced, but with a long latency due to some technical problems
Raw and Reco are in separate file collections
Of the 290M muon triggered events with B=3.8T:
87% have a standalone muon track reconstructed
3% have a global muon track with strip tracker hits (~7.5M tracks)
3 x 10-4 after time adjustment have a track with pixel hits (~75K tracks)
Make linear plot Explain tail Calculate event processing time Show expected processing time for minbias
Approved CRAFT Results

12. CRAFT Data Handling: T0T1
From T0T1: average ~240 MB/s transfer rate
In comparison, dedicated CCRC’08 challenge averaged 600 MB/s
Approved CRAFT Results

13. Data Handling: Data Volume and Castor
Total data volume transferred: 600 TB
Some double counting of total 380 TB for full copy at T1-FNAL
Castor I/O reached 5 GB/s
Approved CRAFT Results

14. Detector Results

15. Operational Fraction of Strip and Pixel Tracker
Strip Tracker
TOB: 98.2% (0.6% recoverable)
TIB/TID: 96.9 % (1% recoverable)
TEC+: 99.2%
TEC-: 97.8 % (1.7% recoverable)
Pixels
Barrel pixels: 99.1%
Forward pixels: 94.0%
Dominated by some readout chips without bias voltage and others without low voltage
Reparation will be attempted during shutdown
Approved CRAFT Results

16. Approved CRAFT Results
Tracker Signal/Noise
On track Strip clusters S/N ratio in peak mode of the read-out chip, corrected for the track angle
TOB thick sensors : S/N = 32
TIB/TID thin sensors : S/N = 27/25
TEC (mixed thickness) : S/N = 30
Track hit finding efficiency
of TIB and TOB layers, excluding modules not in operation
Approved CRAFT Results

17. Cosmic Tracking using Tracker
Three tracking algorithm used for track reconstruction, with different acceptance for cosmics:
Combinatorial Track Finder (CTF standard algorithm for collisions)
Road Search
Cosmic Track Finder
Momentum distribution for high quality tracks (partial statistics)
8 hits
1 hit in TIB L1/L2
1 hit in TOB L5/L6
~70K tracks expected
out of full CRAFT statistics
with PT>100 GeV
Approved CRAFT Results

18. Approved CRAFT Results
Tracker Alignment
Using 4M tracks for alignment and 1M for validation
“Unaligned” is the nominal geometry
“CRUZET” is the geometry obtained from the B=0T runs using the Hits and Impact Point method and survey constraints
“CRAFTHIP” is the geometry obtained from the Hits and Impact Point algorithm applied to CRAFT data, including survey constraints
“CRAFTMP” is the geometry obtained from the Millepede algorithm applied to CRAFT data
Approved CRAFT Results

19. Tracker Barrel Alignment
Mean of residual distributions (cm)
Sensitive to module displacements
Only modules with >30 hits considered
TIB 96%, TID 98%, TOB 98%, TEC 94%
HIP algorithm : TIB RMS = 26m TOB RMS = = 28m
Approved CRAFT Results

20. Approved CRAFT Results
Pixel Occupancy Maps
(cm)
(cm)
The top and bottom modules have a funny effect which was a software bug that is now fixed.
(cm)
(cm)
Approved CRAFT Results

21. Approved CRAFT Results
Pixel Signal
Barrel Pixel cluster charge
corrected for the track angle
The top and bottom modules have a funny effect which was a software bug that is now fixed.
Approved CRAFT Results

22. Pixel Barrel Alignment
RMS=47mm
Barrel aligned at module level ( hits, 89%)
Endcap aligned at half-disk level (8)
Approved CRAFT Results

23. Drift Tube Muon System at CRAFT
Data MC
MB4
MB3
MB2
MB1
Residuals
Reasonable agreement between data and MC after cosmic muon arrival time fit
Sigma ~ 200 – 260 m
B field degrades MB1 in wheels +/-2
Sector 4, wheel -2 
Clean up statistics boxes
Approved CRAFT Results

24. DT Drift Velocity Along Z, Field On/Off
Innermost stations on outer wheels have largest radial field
Maximum difference in drift velocity is 3%
Approved CRAFT Results

25. Average of single DT cell efficiency per SuperLayer
Lower values correspond to Superlayers with some group of disconnected (temporary ) channels
Make labels more visible
Approved CRAFT Results

26. Measured Endcap Deformation at 3.8T
[mm]
SLM 1
SLM 2
SLM 3
3 Straight Line Monitor (SLM) Laser Lines per Muon Endcap Station
10 optical CCD sensors per SLM
Radial distance along SLM [mm]
Approved CRAFT Results

27. HCAL Barrel Muon Reponse
Event selection:
Muon track matching in DT and Tracker
20 GeV/c < Pµ < 1000 GeV/c
CRAFT: 200 K events
MC: K events
CRAFT
data
HB energy: signal from HB towers
corrected for muon path length in HB
Test Beam 2006
Pµ = 150 GeV/c
Mean signal = 2.8 GeV
Approved CRAFT Results

28. Approved CRAFT Results28
Cluster Occupancy
The figure shows the occupancy map of clusters in the ECAL barrel in cosmic muon runs with the magnetic field at 3.8T and the APD gain set to 200 (x4 the LHC conditions). Clusters are seeded either from a single crystal above 15 ADC counts (≈130 MeV) or from two adjacent crystals above 5 ADC counts (≈2x43 MeV). Axes show crystal coordinates along the eta and phi directions.
The top and bottom regions have larger occupancy due to the vertical cosmic rays flux. There’s an excess in the top EB- region, which is closer to the shaft of the CMS P5 pit; other modulations are due to the cluster efficiency varying with crystal light yield.
EB+7 and EB+16 suffered from low voltage problems linked to power supplies and services which are located outside the Supermodule and being fixed. The empty 5x5 crystal regions are trigger towers which were masked from the readout.
EB+
EB-
TOP
BOTTOM
Approved CRAFT Results

29. Approved CRAFT Results29
Average timing
The figure shows the average time associated with clusters in ECAL barrel, in cosmic runs with magnetic field and and APD gain set to 200 (x4 the LHC conditions). Time is measured in clock units (25 ns) with respect to the nominal settings for collisions. Clusters in the bottom are seen later with respect to the top part as a result of the time of flight of the cosmic rays.
EB+
EB-
Exclude channels not read out
TOP
BOTTOM
Approved CRAFT Results

30. Approved CRAFT Results30
Energy spectrum
The figure shows the spectrum of energy deposits in the ECAL barrel in cosmic muon runs with the magnetic field at 3.8T and the APD gain set to 200 (x4 the LHC conditions). Clusters are seeded either from a single crystal above 15 ADC counts (≈130 MeV) or from two adjacent crystals above 5 ADC counts (≈2x43 MeV). Energy is obtained summing the energies of all the crystals belonging to a cluster.
Approved CRAFT Results

31. Approved CRAFT Results31
Stopping power
The figure shows the stopping power of cosmic muons traversing ECAL as a function of the muon momentum as measured in the tracker. In ECAL the energy deposit is measured by the cluster energy matched to the track; the track length is estimated from track propagation inside ECAL crystals. Loose selection on the distance of closest approach of the track to the centre of CMS is applied. Experimental data (dots) are compared to the total stopping power (dE/ρdx) in PbWO4 (black continuous line). The dashed lines are the contributions due to collision loss (red) and bremsstrahlung radiation (blue). Data are displayed in the momentum range where sufficient number of events survive the selections. Errors on the vertical scale are statistical only; error bars on the momentum represent the bin width.
Results indicate the correctness of the tracker momentum scale and of the energy scale in ECAL calibrated with electron at test beams.
Approved CRAFT Results