Local coordinate tests

1. Setup

The motivation for these tests came from the fact that we were observing quite often that if we have a cluster in a layer 6 module that resides on its edge, the cluster was "misplaced", meaning that although the rest of the clusters were well aligned, this one could have been aligned as well if it was positioned on the other edge of the module. These observations gave us the first indication that there can be a possible mirroring in the local coordinate system of the modules in layer 6.

Below we describe the procedure that was followed:

• Embed artificial signal in 2 consecutive p and n strips
  • The signal was placed in both a layer 5 and a layer 6 module
  • Take a standalone run
• Reconstruct the data and see where the cluster finder will locate the cluster
• This exercise was repeated for both A and C side

2. Run 38404

• Embed signal in:
  • Module 1055 (ladder 525 - 6th module)
  • Module 1955 (ladder 628 - 8th module)
  • The 125th p-side and n-side strips and their next ones

Below you can find the two MOOD snapshots showing the embedded signal in the two modules.

Module 1055

Module 1955

Module number with clusters

Local coordinates x-y-z

Global coordinates x-y-z

3. Run 38425

• Embed signal in:
  • Module 1088 (ladder 528 - 17th module)
  • Module 1990 (ladder 629 - 18th module)
  • The 125th p-side and n-side strips and their next ones

Below you can find the two MOOD snapshots showing the embedded signal in the two modules.

Module 1088

Module 1990

Module number with clusters

Local coordinates x-y-z

Global coordinates x-y-z

-- PanosChristakoglou - 16 Jun 2008