LHCb VELO Sensor Review

Production Design Readiness

6 August 2003

T. Bowcock

2

Overview

Design Geometry Checking Submission

Quality Control Discussion

Contract

3

Design

Geometry PR-04 Design Substantive Changes Risks

Checking Method and Time

Submission

4

Design Geometry - Φ

PR-04 Phi Sensor Coordinate system Outside edge defined

by point 1-14 Penetration

2565 microns Foil Cutoff (13/14)

PointX Y

13 6671.23 -2070.0

14 12906.0 2565.0

1 44455.0 2565.0

y

x

5

Design Geometry - Φ

Inner Radius 6985μm

y

x

6

y

x

Design Geometry - Φ

Angles of cut 22.5°

7

y

x

Design Geometry - Φ

Outer “radius” (2,3,4,5,6,7,8) 42235μm

Note(1 and 9) 44455μm

8

Design Geometry - Φ

Cutting All edges straight Ex. inner radius Saw cutting

y

x

9

y

x

Design Geometry - Φ

Angles of cut 22.5°

10

y

x

Design Geometry - Φ

Outer “radius” (2,3,4,5,6,7,8) 42235μm

Note(1 and 9) 44455μm

11

Design Geometry – R

Inner Radius 6985μm

y

x

12

y

x

Design Geometry - Φ

Tolerances Saw compatible

Detector rejected outside tolerance

35μm(85 inner radius)

75μm(135 inner radius)

13

Design Geometry - Φ

Active Area rinner 8170μm

router 42000μm

y

x

14

y

x

Design Geometry - Φ

Inner/Outer Split rsplit 17250μm

dsplit 63μm maximum

insensitive distance 47μm

15

Design Geometry - Φ

Strips Inner 683 Outer 1365

Stereo inner 20° at rinner

9.3° at rsplit

Stereo outer 10.4° at rsplit

4.2° at router

y

x

16

Design Geometry - Φ

y

x

Angular coverage Inner 180.6° Outer 180.5°

Angular Separation Inner Δθ=0.264° Outer Δθ=0.132°

17

y

x

Design Geometry - Φ

Bond Pads in 2 rows 232 in straight line Radial (4° to strips)

18

Design Geometry - Φ

Bond Pads 30072μm y

x450μm

INNER OUTER

Rmin 40842 41292

Rmax 40890 41340

Strip 1

19

Design Geometry - Φ

Bond Pads Readout Order Undesirable feature mod(6) geometry Pad ID each 10. Groups of 64 identified.

12

3

4 5

6

12

3

4 5

6

outerinner

20

Design Geometry - Φ

Bond pad

Section 1

outer

inner bonding

probing

21

Design Geometry - Φ

Fiducials New design

optimized for automated bonding

Improved processing

y

x

22

Design Geometry – R

PointX Y

13 6671.23 2070.0

14 11157.0 2025.0

1 45469.0 2025.0

y

x

PR-04 R Sensor Coordinate system Outside edge defined

by point 1-14 Penetration

2025 microns Foil Cutoff

23

Design Geometry – R

Inner Radius 6985μm

y

x

24

y

x

Design Geometry – R

Angles of cut 22.5°

4 Sectors

25

Design Geometry – R

Outer “radius” (2,3,4,5,6,7,8) 44200μm

Note(1 and 9) 45469μm

y

x

26

Design Geometry – R

Cutting All edges straight Except inner

radius Saw cutting

y

x

27

Design Geometry – R

Tolerances Saw compatible

Detector rejected outside tolerance

35μm(85 inner radius)

75μm(135 inner radius)

y

x

28

Design Geometry – R

Active Area rinner 8170μm

router 42000μm

y

x

29

Design Geometry – R

Sector Split 45°,90°,135° dsplit [2-3] 63μm

maximum insensitive distance 47μm

dsplit [1-2,3-4] 16μm no inefficiency

y

x1

23

4

30

y

x

Design Geometry – R

Strips 4 sectors 512

Radii rinner 8190μm

router 41969.5 μm

Formula r = [exp{b * (n – 1)} * 40 – (40 – b * 8190)] / b b = 0.0018232830411147615

31

Design Geometry – R

Pitches Pinner 40μm

Pouter 101.55μm

Width W~0.4 pitch

y

x

32

Design Geometry – R

Bond Pads 232 in straight line

Angle Group

–180 x (2n – 1) / 64°

y

x

33

Design Geometry – R

Bond Pad Sizes Outer 31090μm Inner 30090μm

Spacing

430μm

34

Design Geometry – R

y

x

35

Design Geometry – R

y

x

36

Design Geometry – R

y

x

37

Design Geometry – R

y

x

y

x