Status of Transfer Line Reconstruction University of Wisconsin-Madison James N. Bellinger University of Wisconsin-Madison 26-Feb-2010 James N. Bellinger 26-February-2010
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
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
Contributions to offsets Disk shifts in CMS_x and CMS_y Disk rotations about CMS_z Variation in transfer plate mounting + + + + Disk shift + + 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 James N. Bellinger 26-Feb-2010
Estimates for disk parameters (2009) Station CMS_x (mm) CMS_y (mm) Rot_z (mrad) ME+3 -.62 -0.36 -0.90 ME+2 0.05 -0.50 -0.75 ME+1 0.02 -1.37 -0.56 ME-1 -0.63 -1.24 -.40 ME-2 -0.53 -1.12 0.80 ME-3 -0.30 -1.36 0.90 +.67 -.14 +.15 +.23 -.24 +.10 James N. Bellinger 26-Feb-2010
ME2 and ME3 rotations Because I fix the ME4 positions as ideal, other positions are only relative. ME2 and ME3 can reconstruct different shifts/rotations ME4 rotation Different distances: different rotations for ME3 and ME2 James N. Bellinger 26-Feb-2010
Resulting Residuals (2009) Station 1H 1V 2H 2V 3H 3V 4H 4V 5H 5V 6H 6V ME+3 1.16 2.86 -0.50 0.59 -3.05 -0.02 0.29 -1.38 2.10 -0.70 X ME+2 0.50 4.14 -0.47 1.10 -4.04 -1.72 1.40 -0.56 2.61 -0.13 ME+1 -0.85 3.62 -0.24 -1.59 -4.91 -3.68 2.83 -1.58 3.16 -1.89 ME-1 -1.18 2.96 0.24 -1.48 -2.29 -2.02 1.60 -.43 -1.64 -.81 ME-2 -0.76 2.99 -0.26 0.90 -0.37 -0.64 0.77 1.51 0.62 2.33 ME-3 -1.21 0.96 0.68 -1.45 -0.35 -0.98 0.71 -0.75 0.17 1.26 James N. Bellinger 26-Feb-2010
Dave's Transfer Plate Shifts ME+3 0.6 -0.41 0.25 1.99 0.15 1.07 0.66 0.46 -0.45 1.78 1.21 0.64 ME+2 -0.87 -0.47 -0.28 1.26 0.43 0.85 -1.5 -0.59 -0.56 -0.48 1.09 0.04 ME+1 -0.12 0.18 0.96 1.69 -0.08 0.99 -0.88 -0.3 1.62 1.2 0.84 ME-1 -0.09 1.13 -0.86 0.51 -1.34 0.1 -1.71 -0.79 1.4 1.37 ME-2 -0.21 4.16 -0.69 1.85 -0.32 -0.65 1.66 0.32 -0.51 0.12 3.59 0.75 ME-3 -1.33 0.68 -2.12 1 -4.62 -0.61 -0.07 -0.72 0.65 -0.64 -1.25 James N. Bellinger 26-Feb-2010
My Transfer Plate Shifts 1V 2H 2V 3H 3V 4H 4V 5H 5V 6H 6V ME+3 1.21 0.37 0.32 2.06 0.16 2.79 0.7 0.4 -0.31 0.24 -2.07 0.05 ME+2 -0.41 0.2 0.17 1.16 0.38 -0.16 -1.41 -0.72 -0.62 -0.53 -0.47 -1.3 ME+1 -2.12 0.82 1.25 1.89 0.59 0.35 -0.66 1.59 -0.28 -3.54 -1.62 -0.48 ME-1 -0.33 1.72 0.76 3.02 -2.36 -4.19 -0.57 -0.51 ME-2 0.34 3.67 0.54 1.62 0.93 0.53 -1.9 0.49 0.29 -0.56 -0.78 -3.8 ME-3 1.49 1.08 2.04 -0.18 0.95 5.2 -0.93 -1.05 -0.2 1.24 James N. Bellinger 26-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 James N. Bellinger 26-Feb-2010
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
BACKUP
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 Peak position (mm) Fit for offsets as well as laser line Z of station (mm)
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
Horizontal (tangent) TL 1,2,3,4
Horizontal TL 5,6; Vertical TL 1,2
Vertical (radial) TL 3,4,5,6