hbd alignment in run-10 (update) mihael makek weizmann institute of science hbd meeting, 8/12/2010
TRANSCRIPT
Mihael MakekWeizmann Institute of Science
HBD Meeting, 8/12/2010
Detector movements during Run-10
Run(s) selected for alignment
• Goal: determine time variations of HBD offsets• Selected data: CCNT - hadrons
• Good quality tracks (31,51,63)• n0 < 0• Emcal matching
• Selected subsample:• p > 0.7 GeV/c• Hbdsize = 1• Restricted geometry in HBD modules• Centrality > 50%
The dataset
Sign dependence
Select particles with p > 0.7 GeV/c to avoid sign dependence
Matching in phi (run 307035)
Matching in z (run 307035)
Offsets in phi
The blue line – weighted average EASTThe red line – weighted average WEST
Offsets in zZ-offsets for East and West are moving synchronously cannot be connected with carriage movements.
BBC calibration?Beam related?
The blue line – weighted average EASTThe red line – weighted average WEST
Check the systemactics of the methodLook at two very close runs:
the difference comparable or smaller than the errors
Offsets in phi - table
Offsets in z - table