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

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Presentation transcript:

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

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 Simple alignment Take average residues from many data sample.

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

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

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

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

8 Alternative Kalman filter I found a LHC alignment workshop talk on the web. pt/2007presentations/Wouter%20Hulsbergen.pdf 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.