Noise run analysis

1. General Information

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

RUN Trigger Sequence Trigger Mode Frequency Events
55635 L2a BC 4000 Hz 1800
55633 L2a BC 40 Hz 1177
55634 L2a BC 400 Hz 3317

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:

RUN Layer 5 Layer 6
55635 10252 2381
55633 283 637
55634 756 1728

2. 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

3. 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

4. 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

-- PanosChristakoglou - 02 Sep 2008

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.

Topic attachments
I Attachment History Action Size Date Who Comment
GIFgif Run55633-ClusterCharge-1.gif r1 manage 10.5 K 2008-09-02 - 19:37 PanosChristakoglou  
GIFgif Run55633-ClusterCharge-2.gif r1 manage 12.2 K 2008-09-02 - 19:37 PanosChristakoglou  
GIFgif Run55633-ClusterCharge-2D.gif r1 manage 12.2 K 2008-09-02 - 19:38 PanosChristakoglou  
GIFgif Run55633-ClusterMap.gif r1 manage 8.8 K 2008-09-03 - 16:07 PanosChristakoglou  
GIFgif Run55633-GlobalCoordinates.gif r1 manage 12.7 K 2008-09-02 - 19:38 PanosChristakoglou  
GIFgif Run55633-LocalCoordinates.gif r1 manage 10.9 K 2008-09-02 - 19:38 PanosChristakoglou  
GIFgif Run55633-ModuleId.gif r1 manage 5.2 K 2008-09-02 - 19:39 PanosChristakoglou  
GIFgif Run55634-ClusterCharge-1.gif r1 manage 10.5 K 2008-09-02 - 19:41 PanosChristakoglou  
GIFgif Run55634-ClusterCharge-2.gif r1 manage 12.2 K 2008-09-02 - 19:42 PanosChristakoglou  
GIFgif Run55634-ClusterCharge-2D.gif r1 manage 12.9 K 2008-09-02 - 19:42 PanosChristakoglou  
GIFgif Run55634-ClusterMap.gif r1 manage 9.5 K 2008-09-03 - 16:07 PanosChristakoglou  
GIFgif Run55634-GlobalCoordinates.gif r1 manage 11.8 K 2008-09-02 - 19:42 PanosChristakoglou  
GIFgif Run55634-LocalCoordinates.gif r1 manage 11.1 K 2008-09-02 - 19:43 PanosChristakoglou  
GIFgif Run55634-ModuleId.gif r1 manage 5.0 K 2008-09-02 - 19:43 PanosChristakoglou  
GIFgif Run55635-ClusterCharge-1.gif r1 manage 10.6 K 2008-09-03 - 16:03 PanosChristakoglou  
GIFgif Run55635-ClusterCharge-2.gif r1 manage 12.2 K 2008-09-03 - 16:03 PanosChristakoglou  
GIFgif Run55635-ClusterCharge-2D.gif r1 manage 13.4 K 2008-09-03 - 16:04 PanosChristakoglou  
GIFgif Run55635-ClusterMap.gif r1 manage 10.3 K 2008-09-03 - 16:04 PanosChristakoglou  
GIFgif Run55635-GlobalCoordinates.gif r1 manage 12.7 K 2008-09-03 - 16:05 PanosChristakoglou  
GIFgif Run55635-LocalCoordinates.gif r1 manage 12.8 K 2008-09-03 - 16:04 PanosChristakoglou  
GIFgif Run55635-ModuleId.gif r1 manage 5.0 K 2008-09-03 - 16:05 PanosChristakoglou  
PNGpng noise_freq55365.png r1 manage 7.7 K 2008-09-04 - 15:49 MarcoVanLeeuwen  
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Topic revision: r6 - 2008-09-04 - MarcoVanLeeuwen
 
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