1 James N. Bellinger University of Wisconsin-Madison 19-Feb-2010 Status of Transfer Line Reconstruction James N. Bellinger 19-February-2010

2 Hand Calculations For each Transfer Line For each plane (radial or tangent) 2 lasers (slope and intercept) 8 (or 12) DCOPS averaged peak positions – If 2 CCDs, average, if 1 use that value – Ignoring laser tilts Fit for 2 slopes and 2 intercepts Fit for 6 (or 10) offsets One of the 12 fits fails

3 Endcap-only vs “Full” Fits Fit values for the offsets same with either fit to < 10μ for Transfer Line 1 “Full” is better for Transfer Lines when far end peaks are poor I use “Full” (w/ MABs) throughout ME4 stations fixed to offset=0 Disks not part of this Simple chi-squared calculation w/ 14 unks

4 James N. Bellinger 19-Feb-2010 Contributions to offsets 1.Disk shifts in CMS_x and CMS_y 2.Disk rotations about CMS_z 3.Variation in transfer plate mounting Disk shift

5 James N. Bellinger 19-Feb-2010 Given Offsets, Calculate an estimate for the disk shifts Calculate an estimate for the disk rotations Use the above to estimate the residuals – Should be an estimate of mounting variation

6 James N. Bellinger 19-Feb-2010 Estimates for disk parameters Station CMS_x (mm) CMS_y (mm) Rot_z (mrad) ME ME ME ME ME ME

7 James N. Bellinger 19-Feb-2010 ME2 and ME3 rotations ME4 rotation Different distances: different rotations for ME3 and ME2 Because I fix the ME4 positions as ideal, other positions are only relative. ME2 and ME3 can reconstruct different shifts/rotations

8 James N. Bellinger 19-Feb-2010 Resulting Residuals Station1H1V2H2V3H3V4H4V5H5V6H6V ME XX ME XX ME XX ME XX ME XX ME XX

9 James N. Bellinger 19-Feb-2010 Dave's Residuals Dave1H1V2H2V3H3V4H4V5H5V6H6V ME ME ME ME ME ME

10 James N. Bellinger 19-Feb-2010 My Residuals My1H1V2H2V3H3V4H4V5H5V6H6V ME ME ME ME ME ME

11 James N. Bellinger 19-Feb-2010 I don't see close agreement I need a better model of the offsets – The average of PG horizontal offsets can mimic a rotation of up to.2mrad – Better model may not address the problem PG per disk ought to be pretty good Transfer line fit ought to be better Cocoa fits vary much more

12 Next few days Give Himali good Minus Endcap fits for Feb – Still some descrepancies Insert photogrammetry offsets for the Transfer Plates and for the disk centers – Revisit PG

13 BACKUP

14 Transfer Line 1, Horizontal Plane Blue points are data Black points are data plus fit DCOPS offset Lines are fit to lasers Horizontal = tangent to the disk Vertical = radial to the disk Z of station (mm) Peak position (mm) Fit for offsets as well as laser line

15 Contributions to Offsets Combination of the effects of: – DCOPS mounting on transfer plate (small: ignored) – Transfer plate mounting on disk O(1mm) – Disk positioning in X/Y O(1mm) – Disk rotations about Z O(5mm) The ME+4 and ME-4 offsets are fixed to 0 – Not included here Poor peaks

16 Horizontal (tangent) TL 1,2,3,4

17 Horizontal TL 5,6; Vertical TL 1,2

18 Vertical (radial) TL 3,4,5,6