1. Study of the impact of HV ramp on reconstruction of physical object using 2011 data
Emmanuel Monnier, Elodie Tiouchichine, Elisabeth Petit
LAr Week
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Aim of this study
LAr inefficiency due to HVRAMP defect: 2% of the data, since september 2011 HVRAMP was: intolerable → tolerable defect
Look at wrong behaviors during HVRAMP.
Look at reconstructed objects in CosmicCalo/JetTauEtmiss stream
Is there any effect of the HV ramps on these objects?
Previous results:
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Methods/Selection
Consider only 2011 runs with HV activity, in the CosmicCalo/JetTauEtmiss data → 111 runs considered in this analysis
Compare reconstructed objects (jets, photons, electrons) in three kind of Lbs depending of HV activity (HV trip, HV ramp, HV stable)
LB trip: when an HVline is tripping .
LB ramp: when an HVline is ramping and there are no trip anywhere.
LB stable: when HV is stable for each HVline of each partition
Selection :
Event in the LAr window veto are rejected (LarError==2)
LB with SEVNOISEBURST are removed
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4. Conclusion of previous study
Run : Trip in the EMB followed by the ramp of 12 HV lines during ~20 Lbs
In the trip area (region in eta x phi fed by the HV line which trip):
More objects reconstructed when HV ramp LBs than during good lbs
Almost all jets are bad jets and none of the photons pass the loose Id
Have to confirm/infirm these conclusions with more statistic → Aim of this presentation
LB Type
HV Trip
HV Ramp
Good LBs
Jets / Evts
(0.67 ± 0.02)*10-2
(0.11 ± 0.02)*10-2
(0.04 ± 0)*10-2
Photon / Evts
(0.26 ± 0.01)*10-2
(0.12 ± 0.02)*10-2
(0.02 ± 0)*10-2
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5. From V. Grassi ,HV status presented at the Lar week :
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Repartition of the trips during 2011 data taking period (without PS trip)
EMECC
EMECA
EMB
HECC
HECA
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Jet cleaning in HV Trip
Number of jets per event:
Jet cleaning is working well even in HV Trip LBs
Mean :0.26
Mean :0.039
Mean :0.001
All jets
No looser bad jets
No tight bad jets
Jet cleaning
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Jets results
Number of jets per event in the trip area:
Many more jets reconstructed / evt during HV Trip
Same rate of jets reconstructed when the HV is ramping or stable
Mean :0.032
Mean :0.001
Mean :0.001
HV Trip
HV Ramp
HV Stable
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Jets results
Number of jet after cleaning looser bad jets, per event, in the trip area:
Requiring no looser bad jets remove many jets in the HV trip Lbs
No remaining jet when tight bad jets removed
Mean :0.0005
Mean :0.0004
Mean :0.0001
HV Trip
HV Ramp
HV Stable
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10. Summary on jets in the trip area
LB type
HV Trip
HV Ramp
Stable
Jets / evts
(3.2 ± 1.0)10-2
(0.12 ± 0.04)10-2
(0.11 ± 0.08)10-2
Jets / evt (cleaning looser bad jets)
(5.0 ± 2.0)10-4
(4.0 ± 1.4)10-4
(1.1 ± 0.7)10-4
Jets / evt (cleaning Tight bad jets)
0 ± 0
O(10-7)
O(10-5)
~ 30 times more jets during HV Trip than HV stable
The rate of jets during HV Ramp and HV Stable are compatible
All the jets are bad jets
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Photons results
Photon per event in the trip area:
Loose photon per event in the trip area:
No differences between all categories of Lbs
Mean :0.007
Mean :0.001
Mean :0.004
HV Trip
HV Ramp
HV Stable
Mean :0.0009
Mean :0.0001
Mean :O(10-5)
HV Trip
HV Ramp
HV Stable
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Electrons results
Electrons per event in the trip area:
Electrons Loose ++ per event in the trip area:
More electrons during HV trip than HV stable
Almost no reconstructed electron during HV ramp and HV stable
None of the electrons pass the loose ++ Id
Mean :0.05
Mean :O(10(-4)
Mean :O(10-5)
HV Trip
HV Ramp
HV Stable
Mean :0
Mean :0
Mean :O(10-7)
HV Trip
HV Ramp
HV Stable
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ETmiss distribution -
Use of MET_Topo (topoclusters)
Etmiss have the same behavior When HV is ramping or stable
The jet cleaning remove the tail of the distribution in all kind of LBs
All events
No looser bad jets
No tight bad jets
Jet cleaning
NB : LB 234 of the run rejected (see backup slides)
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14. Quick look at JetTauEtmiss stream
We want to know if there is effect in physic stream
Runs: ,185644, → 65 pb-1 (~10-7 event)
With 21 Trips
EMB
EMECA
EMECC
HECC
HECA
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15. Jets results – JetTauEtmiss stream
In trip area:
LB type
HV Trip
HV Ramp
Stable
Jets / evts
(16 ±7.5)10-2
(11 ± 4.5)10-2
(10 ± 4.5)10-2
Jets / evt (cleaning looser bad jets)
(10 ± 4)10-2
(10 ± 4.5)10-4
Jets / evt (cleaning Tight bad jets)
(6 ± 2.3)10-2
(7 ± 2.8)10-2
(7 ± 2.9)10-2
The rate of jets is stable in all type of Lbs within the error bars
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16. Photons/Electrons results – JetTauEtmiss stream
In trip area:
LB type
HV Trip
HV Ramp
Stable
Photons / evt
(5.9 ±3.5)10-2
(2.3 ± 1.2)10-2
(10 ± 4.5)10-2
Loose photon / evt
(1.7 ± 1.3)10-2
(0.1 ± 0.0)10-2
LB type
HV Trip
HV Ramp
Stable
Electrons / evt
(7.5 ±2.3)10-2
(5.1 ± 1.9)10-2
(5.1 ± 2.0)10-2
Electrons loose / evt
(0.6 ± 0.3)10-2
(0.4 ± 0.1)10-2
(0.4 ± 0.1)10-4
Electrons Loose++ / evt
The rate of Electromagnetic object is stable in all type of Lbs within the error bars
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17. Etmiss distribution – JetTauEtmiss stream
All events
No looser bad jets
No tight bad jets
Jet cleaning
Many tails in HV trip events
Same behavior when HV is stable or ramping
High tails well removed by the jet cleaning
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Conclusion
Look at reconstructed objects during HV ramps → whole 2011 dataset in empty bunch stream (CosmicCalo) and collision stream (JetTauEtmiss)
Compare rates during trip, ramp and stable HV
Rate increases during trip as expected
Same rate during ramp and stable HV
Jet cleaning and egamma Id applied
All fake objects removed
Conclusion : Safe to use LBs with HV ramps in analysis
Outlook: Look at 2012 data
Specially trip of new modules
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BACKUP
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Bad jets definition
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Noise Burst
Follow this link for more informations :
Definitions :
Q = Quality factor quadratic difference between measured and expected shape of the pulse
Bad channel = Q > 4000
Bad FEB = More than 30 bad channels in the FEB
Noise burst = 5 or more Bad FEB found in the event
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Flag SEVNOISEBURST
When the time stamp of the noise burst is find a LAr time windows veto of 2 sec around the time stamp is applied during the Bulk processing→ LArError == 2
But the defect SEVNOISEBURST can be applied for the lumiblock when:
The cleaning didn't worked well (Burst during more than 2 seconds)(extremely rare)
Burst detected in the collision stream and not in express stream so the time stamp of the brust was not updated in the db before the bulk processing. → 1% of LB (Lar tream is working on a trigger dedicated which will allow to see this noiseburst at the express processing level)
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24. Information on the new Module
Look at Valerio's presentation:
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Study 1- results
Run : Trip in the EMB followed by the ramp of 12 HV lines during ~20 Lbs
Number of jets /event in the trip area (*10-4)
Number of photons /event in the trip area (*10-4)
More objects reconstructed during RAMP Lbs than Good Lbs.
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Study 2 - results
Special HV ramp runs : 368 HV lines in EMEC A eta = [ ], ramping up/down from Vop (operational voltage) to Vop-400V and vice versa
~Same number of object reconstructed during HV ramp and at stable HV
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27. Study 2 - experimental set-up
Special HV ramp runs : 368 HV lines in EMEC A eta = [ ], ramping up/down from Vop (operational voltage) to Vop-400V and vice versa
Ramp a hundred of HV lines at the same time can have biased our results.
% of LB ramping up/down per sector over the LB analyzed
0% of LB ramp up/down
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28. Study 2 - Problematic items
After Cleaning
Photon map
Noise burst
Sporadic noisy cell in the barrel C (Presampleur) remain after cleaning
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29. Study 2 - Problematic items
We already know that few regions in the LAr Calorimeter are affected by a strange activity when there are noise burst.
Photon map
We would expect homogenous map but it's not the case
Typical activity observed when there is a noise burst
Hot spots due to noise burst?
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30. Conclusion on this two last study
The two last study don't lead us to the same conclusion.
First study (HV ramp after real trip): More objects reconstructed during RAMP Lbs than Good Lbs
Second study (Special LAr HV ramp): Same number of object reconstructed during HV ramp and at stable HV
However we don't trust in the last one because in the stream Cosmic Calo we are dominated by the noise bursts
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ETmiss distribution -
Use of MET_Topo (topoclusters)
Etmiss have the same behavior When HV is ramping or stable
The jet cleaning remove the tail of the distribution in all type of LBs
All events
No looser bad jets
No tight bad jets
Jet cleaning
NB :Bump in Ramp Lbs induced by LB 234 of the run
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Jets / event
HV Trip LB
Mean :0.26
HV Ramp LB
Mean :0.19
HV Stable LB
Mean :0.20
HV GRL LB
Mean :0.18
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33. Jets / event – no looser bad jets in the event
HV Trip LB
Mean :0.039
HV Ramp LB
Mean :0.040
HV Stable LB
Mean :0.040
HV GRL LB
Mean :0.044
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34. Jets / event – no Tight bad jets in the event
HV Trip LB
Mean :0.001
HV Ramp LB
Mean :0.003
HV Stable LB
Mean :0.005
HV GRL LB
Mean :0.005
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Summary on jets
LB type
HV Trip
HV Ramp
Stable
GRL WZjets
Jets / evts
0.26 ± 2.0e-2
0.19 ± 1.2e-2
0.20 ± 1.3e-2
0.18 ± 1.2e-2
Looser bad jets / evt
3.9e-2 ± 4.2e-3
4.0e-2 ± 3.5e-3
4.0e-2 ± 7.4e-3
4.5e-2 ± 6.5e-3
Tight bad jets / evt
1.0e-3 ± 2.3e-4
3.1e-3 ± 8.3e-4
4.9e-3 ± 3.6e-3
5.5e-3 ± 3.9e-3
? % more jets during trip than grl
? % more jets during ramp than grl
? % of these jets are Tight bad jets
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Jets results
Number of jet after cleaning tight bad jets, per event, in the trip area:
All jets in all Lbs are Tight bad jets
Mean :0
Mean :0
Mean :O(10-5)
HV Trip
HV Ramp
HV Stable
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Photon / evt
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38. Photon / evt passing Loose Id
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Electron / evt
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Electron Loose / evt
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Electron LoosePP / evt
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