Bug #1751
Detector Alignment
0%
Description
The tracker alignment issue (#1696) suffered some difficulties and eventually started to use the TOFs to determine the overall alignment of the detectors. This helped to some degree but highlighted other issues.
At present I am able to correlate tracks between the following detectors successfully:
-- TOF1 --> Upstream Tracker
-- Upstream Tracker --> Downstream Tracker
Propagating between:
-- Downstream Tracker --> TOF2
-- Downstream Tracker --> EMR
produces a sign flip in the X direction. I am not sure why yet.
Durga: TOF geometry and recon is correct.
Francois: EMR agrees with TOF.
Started relying entirely on the CDB geometry for the reconstruction now (and found a couple of bugs that are being fixed). But still looking for the cause of this misbehavior.
Related issues
Updated by Hunt, Christopher about 8 years ago
Found some bugs in latest geometries (69 & 70). Awaiting a fix. (No detector rotations)
Also found bug in Geometry for Run #07157. Can amend by hand while the bug is being addressed. (Incorrect Station Position)
Updated by Hunt, Christopher about 8 years ago
Update from Durga:
TOF2 may be have an error in the cabling. A HV scan reveled that the number was reverse of what was expected.
Hopefully this will fix the Downstream Tracker -> TOF2 Disagreement.
Will post results once this is addressed.