summary of survey measurements of 180 modules on 30 pixel sectors (9006-9035)
DESCRIPTION
Summary of Survey Measurements of 180 Modules on 30 Pixel Sectors (9006-9035). Ronald J. Madaras Lawrence Berkeley National Laboratory June 14, 2005. Y. X. Button surface. ~700 microns. Back sector surface. ~4018 microns. Front sector surface. (not to scale). - PowerPoint PPT PresentationTRANSCRIPT
Ron Madaras, LBL, June 14, 2005
Summary of Survey Measurementsof 180 Modules
on 30 Pixel Sectors (9006-9035)
Ronald J. MadarasLawrence Berkeley National Laboratory
June 14, 2005
Ron Madaras, LBL, June 14, 2005
Modules-on-Sector Measurements
3 modules on front side.3 modules on back side.
3 mounting buttons glued inholes in carbon sector.
X=0,Y=0 is always left button,looking down on sector, foreach side.
Y
X
Front sector surface
Back sector surface
Button surface~700 microns
~4018 microns
(not to scale)
Ron Madaras, LBL, June 14, 2005
Modules-on-Sector Measurements
For each sector side we measure (using a SmartScope):
1) X,Y of survey targets at the 4 corners of each module. Then calculate:Delta X = Xmeaured - Xnominal, Delta Y = Ymeaured - Ynominal
• 32 X,Y,Z points on the top side of each module (16 along one long edge, 16 along the other long edge) in the vicinity of the first and last chip ID pads of each front-end chip.Calculate: Bow & Twist of module, & Height of module above sector plane.
3) 12 X,Y,Z points on the sector surface. Fit 12 points to a 3D sector plane.Save: fit parameters, chi-square, residuals mean and residuals RMS.(This is done 3 times for each side, each time a module is measured.)
4) 4 X,Y,Z points on the button surface, for each of 3 mounting buttons. Fit 12points to a 3D button plane.Save: fit parameters, chi-square, residuals mean and residuals RMS.(This is done 3 times for each side, each time a module is measured.)Compare sector plane and button plane.
Ron Madaras, LBL, June 14, 2005
Delta X, Delta Y of Module Survey Targets
Delta X and Delta Y of Survey Targets of Modules on Sectors(for 180 modules on 30 sectors, 9006-9035)
Mean: -2.6 micronsSigma: 3.0 microns
Mean: -0.2 micronsSigma: 2.6 microns
From fits:
Ron Madaras, LBL, June 14, 2005
Module Bow and Twist Measurements
Bow and Twist Measurements of Modules on Sectors(for 180 modules on 30 sectors, 9006-9035)
Average |Bow| = 7 microns RMS |Bow| = 6 microns
Average |Twist| = 0.8 mr RMS |Twist| = 0.6 mr
Average Bow = 3 microns RMS Bow = 9 microns
Average Twist = 0.1 mr RMS Twist = 1.0 mr
Bow Measurements(180 modules on 30 sectors)
0
10
20
30
40
50
60
-35 -25 -15 -5 5 15 25 35
Bow (microns)
Frequency
Twist Measurements(180 modules on 30 sectors)
0
10
20
30
40
50
-3.0 -2.0 -1.0 0.0 1.0 2.0 3.0
Twist (mr)
Frequency
Ron Madaras, LBL, June 14, 2005
Module Height Above Sector Surface
For each of the 180 modules on the 30 sectors, calculate the height of the top side of the module above the sector plane at the 32 measured points. Then:
a) Calculate the Tilt of each module with respect to the sector plane:Tilt = Module height at top of module - Module height at bottom
b) Calculate the Mean of the 32 heights and the RMS of the 32 heights for each Module. Compare Mean Height to Nominal Value (270 microns).
Average |Tilt| = 14 microns RMS |Tilt| = 11 microns
Average = 52 microns RMS = 11 microns
Average = 12 microns RMS = 4 microns
Tilt Above Sector Plane(180 modules on 30 sectors)
0
10
20
30
40
50
-60 -40 -20 0 20 40 60
Tilt (microns)
Frequency
Mean Height Above Sector Plane - Nominal
(180 modules on 30 sectors)
0
10
20
30
40
50
60
25 35 45 55 65 75 85 95Mean - Nom (microns)
Frequency
RMS (Heights AboveSector Plane)
(180 modules on 30 sectors)
0
5
10
15
20
25
30
35
40
6 10 14 18 22 26RMS (microns)
Frequency
Ron Madaras, LBL, June 14, 2005
Comparison of Sector and Button Planes
At X=0,Y=0, calculate the Z difference between the sector and button planes:Zdiff = (Zsector-Zbutton) - Nominal Value
For the front sector plane: Zdiff = sector thickness + button thickness - 4018 (µm)For the back sector plane: Zdiff = -button thickness - (-700) (µm)
Average = 22 microns RMS = 12 microns
Average = -12 microns RMS = 21 microns
Results indicate actual button thickness is ~17 microns greater than nominal.
(Zsector-Zbutton) - 4018for the Front Sector Plane
(90 modules on 30 sectors)
0
5
10
15
20
25
-15 -5 5 15 25 35 45Zdiff (microns)
Frequency
(Zsector-Zbutton) - (-700)for the Back Sector Plane
(90 modules on 30 sectors)
0
2
4
6
8
10
12
14
16
-35 -25 -15 -5 5 15 25 35Zdiff (microns)
Frequency
Ron Madaras, LBL, June 14, 2005
Comparison of Sector and Button Planes
Non-parallelism of the sector and button planesNon-parallelism = (Zsector-Zbutton)X,Y - (Zsector-Zbutton)0,0
Non-parallelism = 0 if the sector and button planes are parallel.
Measure non-parallelism for X=0,Y=-70 (along length of sector) X=70,Y=0 (along width of sector)
Since the buttons are distributed mainly in X, and not very much in Y, expect non-parallelism along the length (Y) of the sector to be measured less precisely than along the width (X) of the sector.
Non-parallelism (NP) is measured 3 times for the front of the sector and 3 times for the back of the sector, once every time a module is measured. For a given non-parallelism of the sector and button planes, sign conventions are such that if we measure it exactly, the front and back non-parallelisms have opposite signs for X=0,Y=-70 and the same signs for X=70,Y=0. Thus:
For X=0,Y=-70: Average NP (of a sector) = (Front NP - Back NP)/2Front/Back NP “difference” = (Front NP + Back NP)/2 would be zero
For X=70,Y=0: Average NP (of a sector) = (Front NP + Back NP)/2Front/Back NP “difference” = (Front NP - Back NP)/2 would be zero
A deviation from zero of (Front NP +/- Back NP)/2 indicates how well or poorly we measure the non-parallelism.
Ron Madaras, LBL, June 14, 2005
Comparison of Sector and Button Planes
Average = 11 microns, RMS = 25 microns
Non-parallelism (NP) of the sector and button planes (continued)
Average NP for X=0,Y=-70
0
1
2
3
4
5
6
-45 -35 -25 -15 -5 5 15 25 35 45 55Average NP (microns)
Frequency
Average NP for X=70,Y=0
0
2
4
6
8
10
12
-45 -35 -25 -15 -5 5 15 25 35 45 55Average NP (microns)
Frequency
Front/Back NP diff for X=0,Y=-70
0
1
2
3
4
5
6
7
8
-45 -35 -25 -15 -5 5 15 25 35 45 55(Front NP + Back NP)/2 (microns)
Frequency
Average = -2 microns, RMS = 14 microns
Average = -1 microns, RMS = 7 microns
Average = 1 microns, RMS = 5 microns
Front/Back NP diff for X=70,Y=0
0
2
4
6
8
10
12
14
-45 -35 -25 -15 -5 5 15 25 35 45 55(Front NP - Back NP)/2 (microns)
Frequency
30 Sectors 30 Sectors
30 Sectors 30 Sectors
Ron Madaras, LBL, June 14, 2005
Conclusions for 180 Modules on 30 Sectors
Modules are glued to sectors with a position accuracy of 3 microns in X & Y!
For other measured quantities:Average RMS
|Bow| 7 6 microns|Twist| 0.8 0.6 mr|Tilt| 14 11 microns(Mean height above sector plane) - Nominal 52 11 micronsRMS (Heights above sector plane) 12 4 micronsZdiff = (Zsector-Zbutton) - Nom
Front: 22 12 micronsBack: -12 21 microns
Non-parallelism:X=0,Y=-70: Average 11 25 microns
(Front+Back)/2 -2 14 microns X=70,Y=0: Average -1 7 microns
(Front-Back)/2 1 5 microns