Frontemare di Trieste
Istituto Nazionale di Fisica Nucleare
Sezione di Trieste

Detector Commissioning - Part 5

Detector Quality Assurance - Part 1

General Information - 1

During this run the ZS threshold was set to 3σ.

RUNTrigger SequenceTrigger ModeFrequencyEvents
55635L2aBC4000 Hz1800
55633L2aBC40 Hz1177
55634L2aBC400 Hz3317

The reconstruction was performed with AliRoot v4-14-Release. The official OCDB files were used from AliEn. These files were produced from previous calibration runs.

The analysis of the SSD clusters revealed that we have the following number of golden clusters over all the events for the two runs:

RUNLayer 5Layer 6
55635102522381
55633283637
556347561728

Results from the run 55633

Number of clusters per module/number of events [%]
Run55633-ClusterMap.gif
Module number with clusters
Run55633-ModuleId.gif
Local coordinates x-y-z
Run55633-LocalCoordinates.gif
Global coordinates x-y-z
Run55633-GlobalCoordinates.gif
Cluster type - Charge ratio - Cluster charge
Run55633-ClusterCharge-1.gif
Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP
Run55633-ClusterCharge-2.gif
Cluster charge map - Cluster charge correlation
Run55633-ClusterCharge-2D.gif

Results from the run 55634

Number of clusters per module/number of events [%]
Run55634-ClusterMap.gif
Module number with clusters
Run55634-ModuleId.gif
Local coordinates x-y-z
Run55634-LocalCoordinates.gif
Global coordinates x-y-z
Run55634-GlobalCoordinates.gif
Cluster type - Charge ratio - Cluster charge
Run55634-ClusterCharge-1.gif
Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP
Run55634-ClusterCharge-2.gif
Cluster charge map - Cluster charge correlation
Run55634-ClusterCharge-2D.gif

Results from the run 55635

Number of clusters per module/number of events [%]
Run55635-ClusterMap.gif
Module number with clusters
Run55635-ModuleId.gif
Local coordinates x-y-z
Run55635-LocalCoordinates.gif
Global coordinates x-y-z
Run55635-GlobalCoordinates.gif
Cluster type - Charge ratio - Cluster charge
Run55635-ClusterCharge-1.gif
Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP
Run55635-ClusterCharge-2.gif
Cluster charge map - Cluster charge correlation
Run55635-ClusterCharge-2D.gif

Frequency distribution points per module/per event (golden points only)

noise_freq55365.png

There is kind of an exponential distribution. About 90% of the modules have no points (as it should be)!

I also looked at x,y distributions in modules. In many cases, most hits are again at 1 or two strips in a module. So it seems that by masking out a limited number of strips, we could clean up this distribution. The question is whether this set of strips is stable in time.

It would be interesting to look for non-gaussian tails in pedestal runs.

General Information - 2

During this run the ZS threshold was set to 3.6σ.

RUNTrigger SequenceTrigger ModeFrequencyEvents
56288L2aBC4000 Hz1502
56286L2aBC40 Hz1007
56287L2aBC400 Hz1056

The reconstruction was performed with AliRoot v4-14-Release. The official OCDB files were used from AliEn These files were produced from previous calibration runs.

The analysis of the SSD clusters revealed that we have the following number of golden clusters over all the events for the two runs:

RUNLayer 5Layer 6
56288513680
562869821
562874622

Results from the run 56286

Number of clusters per module/number of events [%]
Run56286-ClusterMap.gif
Module number with clusters
Run56286-ModuleId.gif
Local coordinates x-y-z
Run56286-LocalCoordinates.gif
Global coordinates x-y-z
Run56286-GlobalCoordinates.gif
Cluster type - Charge ratio - Cluster charge
Run56286-ClusterCharge-1.gif
Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP
Run56286-ClusterCharge-2.gif
Cluster charge map - Cluster charge correlation
Run56286-ClusterCharge-2D.gif

Results from the run 56287

Number of clusters per module/number of events [%]
Run56287-ClusterMap.gif
Module number with clusters
Run56287-ModuleId.gif
Local coordinates x-y-z
Run56287-LocalCoordinates.gif
Global coordinates x-y-z
Run56287-GlobalCoordinates.gif
Cluster type - Charge ratio - Cluster charge
Run56287-ClusterCharge-1.gif
Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP
Run56287-ClusterCharge-2.gif
Cluster charge map - Cluster charge correlation
Run56287-ClusterCharge-2D.gif

Results from the run 56288

Number of clusters per module/number of events [%]
Run56288-ClusterMap.gif
Module number with clusters
Run56288-ModuleId.gif
Local coordinates x-y-z
Run56288-LocalCoordinates.gif
Global coordinates x-y-z
Run56288-GlobalCoordinates.gif
Cluster type - Charge ratio - Cluster charge
Run56288-ClusterCharge-1.gif
Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP
Run56288-ClusterCharge-2.gif
Cluster charge map - Cluster charge correlation
Run56288-ClusterCharge-2D.gif

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