Results from the run 82762

1. General Information

RUN 82762
Events	128709
Detectors	SPD - SDD - SSD - TPC - TRD - TOF - HMPID - ACORDE - V0 - ZDC
SSD DDLs	16
SSD LDCs	8
Duration	00:33:35

The overall information for this run can be found here.

The run was take with the magnetic field ON having a value of B = 0.5 T. The trigger detectors were the SPD, the TOF and the ACORDE. The rate was dominated by the one set by the TOF trigger and this resulted into not many tracks reaching the SSD (see below).

2. OCDB files

The OCDB files that were used for the reconstruction of this run were produced by the SSD DA during the pedestal run with the number 82744. The plots below show the map of the bad channels:

3. Analysis of clusters

Here are some histograms obtained with the official offline QA for the SSD clusters. In all plots we see the accumulated statistics from all the events of this run. There was a selection on the golden clusters.

Cluster map

Number of clusters per event per layer

Module number with clusters

Local coordinates x-y-z

Global coordinates x-y-z

Cluster type - Charge ratio - Cluster charge

Cluster charge (P-Side) - Cluster charge (N-Side) - qN/qP

Cluster charge map - Cluster charge correlation

4. ESD analysis

The plot below shows for each triggered class if we had a track with an associated cluster on each one of the ITS layers or not. It is read as follow:

• 0.14% of the events were triggered by the SPD and there was no track with an SSD layer 5 assigned cluster
• 0.25% of the events were triggered by the SPD and there was at least one track with an SSD layer 5 assigned cluster
• 88.8% of the events were triggered by the TOF (back-to-back \pm 3) and there was no track with an SSD layer 5 assigned cluster
• 0.05% of the events were triggered by the TOF (back-to-back \pm 3) and there was at least one track with an SSD layer 5 assigned cluster
• 9.6% of the events were triggered by the TOF (back-to-back) and there was no track with an SSD layer 5 assigned cluster
• 0.004% of the events were triggered by the TOF (back-to-back) and there was at least one track with an SSD layer 5 assigned cluster

• 0.14% of the events were triggered by the SPD and there was no track with an SSD layer 6 assigned cluster
• 0.23% of the events were triggered by the SPD and there was at least one track with an SSD layer 6 assigned cluster
• 88.8% of the events were triggered by the TOF (back-to-back \pm 3) and there was no track with an SSD layer 6 assigned cluster
• 0.04% of the events were triggered by the TOF (back-to-back \pm 3) and there was at least one track with an SSD layer 6 assigned cluster
• 9.6% of the events were triggered by the TOF (back-to-back) and there was no track with an SSD layer 6 assigned cluster

The plot below shows the energy loss from the ITS layer vs the momentum of the reconstructed track.

-- PanosChristakoglou - 2009-09-06