1. Detector Alignment using cosmic muon data Jaewon Park University of Rochester MINERvA/Jupiter group Meeting, Oct 31, 2007

2. 2 Overview Check Alignment scheme.  What alignment data looks like. Issue with alignment  Banana effect Alignment simulation  Generate tracks with fake misaligned modules.  Extract alignment data and compare with true valule. Testing alternative Kalman filter method.

3. 3 Simple alignment Take average residues from many data sample.

4. 4 Plane alignment – rotation angle Y-intercepts are lined up. Y-intercept In perfect alignment, LPos will be ignored

5. 5 Alignment parameters d Plane position is specified by angle θ 0 and offset d.

6. 6 Offset calculation y 0 = y-intercept of y-intercept

7. 7 Toy Kalman filter Using root. Didn’t add fake misalignment yet.

8. 8 Alternative Kalman filter I found a LHC alignment workshop talk on the web. http://lhcb-doc.web.cern.ch/lhcb-doc/presentations/conferencetalks/postscri pt/2007presentations/Wouter%20Hulsbergen.pdf http://lhcb-doc.web.cern.ch/lhcb-doc/presentations/conferencetalks/postscri pt/2007presentations/Wouter%20Hulsbergen.pdf It mentions alternative Kalman filter suitable for align ment. (Track model and calibration are not independe nt.) Plan: Try it and compare how much it better than old one.