1. Calibration: preparation for pa
C. Zampolli
Calibration: preparation for pa
07/01/2013
C. Zampolli

2. Calibration strategy – CPass0 + CPass1
Chunk 0
Chunk 1
Chunk N
Chunk 0
Chunk 1
Chunk N … …
Alien job
Alien job
Alien job
Alien job
Alien job
Alien job
Alien job
Alien job
OCDB
snapshot
snapshot
reconstruction
reconstruction
ESDs
ESDs
Calib. train
Calib. train
QA train
Merging + OCDB entires
Merging + OCDB entires
07/01/2013
OCDB Update
C. Zampolli
OCDB Update

3. Run selection
Runs are picked automatically from the logbook, with the following criteria:
PHYSICS run, Beam ON, GOOD Data Quality flag, GRP pp in DONE, at least one of SDD, T0, TOF, TPC, TRD, number of kCalibBarrel > 0, data migrated, B field ok
If TPC  TPC pp in DONE
If TRD  TRD pp in DONE
If SPD  SPD pp in DONE (SPD should be always there)
GOOD Data Quality flag set online in the ACR
Runs should last at least 5 minutes
NB.
In pp: kCalibBarrel = SPI triggers; kCalibOuter = EMCAL + MUON + PHOS triggers
In pA: kCalibBarrel defined differently (see later); kCalibOuter = EMCAL + MUON + PHOS triggers
07/01/2013
C. Zampolli

4. pA During standard data taking: During MB-like data taking:
Using high-multiplicity trigger (20 Hz)
Still to be set by Trigger experts; using VZERO
During MB-like data taking:
Downscaling at reconstruction level, according to:
min(max(nevents/10,30000),nevents)/nevents
If events <=  reconstruct all
If events >=  reconstruct 10%
In between, 30000
No kCalibBarrel defined
kCalibOuter kept as now
More QA from fast MUON +
calorimeters reconstruction
(kPhysME)
30000 due to >3x higher multiplicity in pA than pp
30000 events
10% of the statistics
07/01/2013
C. Zampolli

5. Trigger Clusters
Data taking will be in the same run with two different partitions:
Fast cluster  without SDD, AOCRDE, EMCAL, FMD, PHOS, MUON, PMD
ALL cluster  everybody
CENT cluster  without MUON, PMD
MUON cluster MUON + SPD + SSD (?) + T0 + V0 + ZDC
Ken's talk at last PB
07/01/2013
C. Zampolli

6. But…
Data taking will be in the same run with two different partitions:
Fast cluster  without SDD, ACORDE, EMCAL (?), FMD (?), PHOS, MUON, PMD
ALL cluster  everybody
CENT cluster  without MUON, PMD
MUON cluster MUON + SPD + SSD (?) + T0 + V0 + ZDC
Events in these clusters could be used for calibration, but the absence of SDD could bias the results, and SDD might not have enough events
Only use ALL + CENT
Standard pA  kCalibBarrel should not be associated to events from Fast cluster
MB data taking  dedicated alias as discussed in
Since an an event can be read out by two clusters, a sort of “exclusive” selection of aliases is needed (e.g. only ALL, not Fast)
Ken's talk at last PB
07/01/2013
C. Zampolli

7. CPass calibration code status
V5-03-Rev-03 should have been the “golden” release
Some changes needed, new revision foreseen
Detector
Status
Mean Vertex ok
SDD
TPC
TRD
TOF Ok T0 ?
No reprocessing possible yet
07/01/2013
C. Zampolli

8. TPC calibration
dEdx resolution worsens at high rate (~8%), together with space point distortion (3 sigma)
So far, only extrapolation can be done
Procedure definition need data
For space point distortion, a first workaround could be put in place
Require manual calibration after PPass (high-pt trees needed)
After that, full calibration chain to be re-run (TPC calibration would change)
07/01/2013
C. Zampolli

9. Current “schedule”
Monday 7 Jan, Sunday 13 Jan  machine and injectors commissioning
Monday 14 Jan  setting up for pA
4 days of setup (could even be that they declare STABLE BEAMS)
Friday 18 Jan  Physics
5-7 days of MB (to accumulate 100M events)
Then increase in luminosity, different trigger configuration
Monday 11 feb (at 6 am)  end of pA, start of pp at low energy
Each step depends on the previous one
Any delay could have consequences on the next steps!
E.g.: any delay this week would make pA shift in time
pA vs Ap  change of period probably better
07/01/2013
C. Zampolli

10. 2012 data – what is left LHC12h LHC12i
VPass started over Christmas; almost completed
Run (8740 chunks for ~1.3M of MB events) failed in CPass0 merging (EE)
LHC12i
CPass reprocessing completed over Christmas (checking a few runs)
Manual update window to be opened, QA readiness to be assessed  deadline next week, then busy times for pA, so maybe VPass will need to be postponed
07/01/2013
C. Zampolli