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

2. Detector movements during Run-10 Run(s) selected for alignment

3. 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

4. Sign dependence Select particles with p > 0.7 GeV/c to avoid sign dependence

5. Matching in phi (run 307035)

6. Matching in z (run 307035)

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

8. 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

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

10. Offsets in phi - table

11. Offsets in z - table