The measured x,y co-ordinates of 5 fiducials are mapped to the nominal
positions by minimising the differences in x,y of measured and nominal
points using three free parameters, x0, y0 and rotation angle Zrot:
Xm - ( Xn*cos(Zrot) - Yn*sin(Zrot) - x0 )
Ym - ( Xn*sin(Zrot) + Yn*cos(Zrot) - y0)
| CERN (Fit Summary) | LHCb
x (mm) | LHCb
y (mm) | Vz
(mrad) |
|---|
| R si offset relative to nominal | 0.000 |
0.000 | 0.000 |
| P si offset relative to nominal | 0.000 |
0.000 | 0.000 |
| Mean offset | 0.000 |
0.000 | |
|
| P si offset relative to R si | 0.000 |
0.000 | 0.000 |
Metrology data Si_align.sum open failed
| Liverpool (Fit Summary) | LHCb
x (mm) | LHCb
y (mm) | Vz
(mrad) |
|---|
| R si offset relative to nominal | -275.000 |
130.028 | 0.000 |
| P si offset relative to nominal | -275.000 |
130.028 | 0.000 |
| Mean offset | -275.000 |
130.028 | |
|
| P si offset relative to R si | 0.000 |
0.000 | 0.000 |
|
The measured x,y co-ordinates of 5 fiducials and 8 extra points are fitted to
a plane Z - Vy*X - Vx*Y - Z0 = 0 by minimising deviations in Z
Free parameters are Vx, Vy and z-displacement Z0:
Min dz / Max dz / RMS mean / are about the mean of the Z measurements (μm)
RMS plane is the rms variation in z about the fitted plane (μm)
CERN (Fit Summary)
| Module | Glued | Type |
Min dz | Max dz | RMS
mean |
Vx
(mrad) | Vy
(mrad) | LHCb
Z0 (mm) | RMS
plane |
|---|
| | R |
| | Phi |
Metrology data module00/MET1/R_summary.txt open failed Metrology data module00/MET1/Phi_summary.txt open failed Error Processing module
Liverpool (Fit Summary)
| Module | Glued | Type |
Min dz | Max dz | RMS
mean |
Vx
(mrad) | Vy
(mrad) | Module
Z0 (mm) | RMS
plane |
|---|
| | R |
| | |
| | | |
| | Phi |
| | |
| | | |
|