HBD Alignment in Run-10 (update) Mihael Makek Weizmann Institute of Science HBD Meeting, 8/12/2010.

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Presentation transcript:

HBD Alignment in Run-10 (update) Mihael Makek Weizmann 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 )

Matching in z (run )

Offsets in phi The blue line – weighted average EAST The red line – weighted average WEST

Offsets in z Z-offsets for East and West are moving synchronously  cannot be connected with carriage movements. BBC calibration? Beam related? The blue line – weighted average EAST The red line – weighted average WEST

Check the systemactics of the method Look at two very close runs:  the difference comparable or smaller than the errors

Offsets in phi - table

Offsets in z - table