tower a software alignment glast lat project tower a software alignment 28 jan 2005 m.kuss, a.brez1...

GLAST LAT Project Tower A software alignmentTower A software alignment 28 Jan 2005

M.Kuss, A.Brez 1

Tower A software alignmentTower A software alignment

28 january 2005


M.Kuss, A.Brez 2

Ladder alignment on a tray Ladder alignment on a tray Tower A

ladder position errors

0

10

20

30

40

50

60

-0.1

-0.0

75

-0.0

5

-0.0

25 0

0.02

5

0.05

0.07

5

0.1

mm

m

Tower Aladders planatiry

0

2

4

6

8

10

12

0 0.05 0.1 0.15 0.2

mm

mean=0.076mmM

CM

sid

eThe ladders alignment is measured with a CMM with optical probe (3 points per ladder) in G&A . The small dispersion of the data (=18m, planarity ~ 0.1mm) allows to consider the 4 ladders of a tray plane as a single detector.We do not need to introduce ladder per ladder alignment corrections


M.Kuss, A.Brez 3

Tower B ladders alignmentTower B ladders alignment

Tower Bladder position errors

0

10

20

30

40

50

60

70

-0.1

-0.0

75

-0.0

5

-0.0

25 0

0.02

5

0.05

0.07

5

0.1

mm

m

Tower Bladders planatiry

0

2

4

6

8

10

12

0 0.05 0.1 0.15 0.2

mm

mean=0.075mm


M.Kuss, A.Brez 4

Tray thicknessTray thickness

SSD plane

Pins plane

The tray thickness is also measured. The results are well within the design specs

tower A thickness mid heavy light top* bottom*min 30.20 30.96 29.99max 30.41 31.11 30.17average 30.30 31.02 30.08 29.12 29.30nominal 30.37 31.36 30.17 29.38 29.30

measured values

* Distance from the SSD to the alignment pins on the thermal boss

tower B thickness mid heavy light top* bottom*min 30.10 30.95 29.92max 30.38 31.20 30.06average 30.24 31.03 29.99 29.10 29.28nominal 30.37 31.36 30.17 29.38 29.30

measured values


M.Kuss, A.Brez 5

Software tray alignment: rotationSoftware tray alignment: rotation

x•y

A parallelism error generates an error which is proportional to the orthogonal coordinate (v) of the event. v has to be extrapolated from the fitted 3-dimensional track.The fit of the profile histogram gives immediately the rotation tan() of the plane (parameter p1). p0 again is a measure horizontal shift, but here at v=0 (the preceeding methods give the shift at the center of the wafer).

resi

dual

/mm

orth. coordinate/mm

profile histogram

orth. coordinate/mm

resi

dual

/mm


M.Kuss, A.Brez 6

Software tray alignment: verticalSoftware tray alignment: vertical

Theoretical SSD height

True SSD height

xtg(•z

z

In similar way to the horizontal case, it is possible to determine the relative height in the tower of a SSD plane studying the residual distribution as a function of the incident angle of the tracks.

The fit of the profile histogram gives immediately the vertical shift (parameter p1), and once again the horizontal (p0).

cot()

profile histogram

cot()

resi

dual

/mm

resi

dual

/mm


M.Kuss, A.Brez 7

Software tray alignment: horizontalSoftware tray alignment: horizontal

A shift of a plane with respect to the other ones generates a residual distribution not centered around 0 (measured points - reconstructed trajectory). An iterative algorithm allows to align the detectors so that all the residual distributions are 0 centered.

shift

before

after


M.Kuss, A.Brez 8

Coordinate shifts XCoordinate shifts XX shifts

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

3060

0035

7A

SS

Y J

IG

3060

0038

2S

IDE

WA

LLS

ON

3060

0038

4S

IDE

WA

LLS

ON

3060

0038

5S

IDE

WA

LLS

ON

3030

0205

4A

FTE

R V

IBE

3080

0028

1 TV

-20

C

3080

0032

6 TV

+50C

3080

0033

3 TV

+50C

3080

0044

8 TV

-20

C

3080

0044

9 TV

-20

C

3080

0057

6 TV

+50C

3080

0058

3 TV

+20C

3060

0044

5 P

ISA

3060

0047

5C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

X0

X1

y2

X3

X4

X5X6

X7

y8

X9

X10

X11X12

X13

X14

X15

X16

X17

X shifts differential

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

3060

0035

7A

SS

Y J

IG

3060

0038

2S

IDE

WA

LLS

ON

3060

0038

4S

IDE

WA

LLS

ON

3060

0038

5S

IDE

WA

LLS

ON

3030

0205

4A

FTE

R V

IBE

3080

0028

1 TV

-20

C

3080

0032

6 TV

+50C

3080

0033

3 TV

+50C

3080

0044

8 TV

-20

C

3080

0044

9 TV

-20

C

3080

0057

6 TV

+50C

3080

0058

3 TV

+20C

3060

0044

5 P

ISA

3060

0047

5C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

X0X1

X2

X3

X4

X5

X6

X7y8

X9

X10

X11

X12

X13

X14X15

X16

X17

The tower jigs aligns the pins that have been used to align the ladders (the best reference)When the pins on the alignment wall of the tower jig are removed, the sidewalls partially realign the trays to their external dimensions with a max alignment loss ~0.1mm

Sidewalls assyVibe test

TV test

Sidewall removal

Shipment to SLAC


M.Kuss, A.Brez 9

Coordiante shifts YCoordiante shifts YY shifts

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

3060

0035

7A

SS

Y J

IG

3060

0038

2S

IDE

WA

LLS

ON

3060

0038

4S

IDE

WA

LLS

ON

3060

0038

5S

IDE

WA

LLS

ON

3030

0205

4A

FTE

R V

IBE

3080

0028

1 TV

-20

C

3080

0032

6 TV

+50C

3080

0033

3 TV

+50C

3080

0044

8 TV

-20

C

3080

0044

9 TV

-20

C

3080

0057

6 TV

+50C

3080

0058

3 TV

+20C

3060

0044

5 P

ISA

3060

0047

5C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

y0

y1

y2

y3

y4

y5

y6

y7

y8

y9

y10

y11

y12

y13

y14

y15

y16

y17

Y shifts differential

-0.15

-0.1

-0.05

0

0.05

0.1

0.15

3060

0035

7A

SS

Y J

IG

3060

0038

2S

IDE

WA

LLS

ON

3060

0038

4S

IDE

WA

LLS

ON

3060

0038

5S

IDE

WA

LLS

ON

3030

0205

4A

FTE

R V

IBE

3080

0028

1 TV

-20

C

3080

0032

6 TV

+50C

3080

0033

3 TV

+50C

3080

0044

8 TV

-20

C

3080

0044

9 TV

-20

C

3080

0057

6 TV

+50C

3080

0058

3 TV

+20C

3060

0044

5 P

ISA

3060

0047

5C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

y0

y1

y2

y3y4

y5

y6

y7y8

y9

y10

y11y12

y13

y14y15

y16

y17

These trays are aligned on the tower jig on a structural closeout.The relative alignment of the ladders is poorer, but the max loss of alignment after sidewalls assembly is only 0.05mm

Reference wall of the tower jig


M.Kuss, A.Brez 10

Ladder parallelismLadder parallelism

Y rotations

-0.400

-0.300

-0.200

-0.100

0.000

0.100

0.200

0.300

0.400

0.500

0.600

3060

0035

7 A

SS

Y J

IG

3060

0038

2 S

IDE

WA

LLS

ON

3060

0038

4 S

IDE

WA

LLS

ON

3060

0038

5 S

IDE

WA

LLS

ON

3030

0205

4 A

FTE

R V

IBE

3080

0028

1 TV

-20C

3080

0032

6 TV

+50

C

3080

0033

3 TV

+50

C

3080

0044

8 TV

-20C

3080

0044

9 TV

-20C

3080

0057

6 TV

+50

C

3080

0058

3 TV

+20

C

3060

0044

5 P

ISA

3060

0047

5 C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

y0y1

y2y3

y4y5y6y7

y8y9y10y11y12

y13y14y15y16

y17

X rotations

-0.400

-0.300

-0.200

-0.100

0.000

0.100

0.200

0.300

0.400

3060

0035

7A

SS

Y J

IG

3060

0038

2S

IDE

WA

LLS

ON

3060

0038

4S

IDE

WA

LLS

ON

3060

0038

5S

IDE

WA

LLS

ON

3030

0205

4A

FTE

R V

IBE

3080

0028

1 TV

-20

C

3080

0032

6 TV

+50C

3080

0033

3 TV

+50C

3080

0044

8 TV

-20

C

3080

0044

9 TV

-20

C

3080

0057

6 TV

+50C

3080

0058

3 TV

+20C

3060

0044

5 P

ISA

3060

0047

5C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

X0

X1

X2

X3

X4

X5

X6

X7

X8

X9

X10X11

X12

X13

X14

X15

X16

X17

Parallelism for X trays ± 0.1mmParallelism for Y trays ± 0.2mm except for layer Y2 (light tray 016, top side) with an anomalous parallelism of 0.45mmThe general difference in parallelism between X and Y trays can be related with the tower jig.No explanation for the Y2 anomalous parallelism.


M.Kuss, A.Brez 11

Coordiante shifts ZCoordiante shifts ZZ SHIFTS

-0.500

-0.400

-0.300

-0.200

-0.100

0.000

0.100

0.200

0.300

0.400

3060

0035

7 A

SS

Y J

IG

3060

0038

2 S

IDE

WA

LLS

ON

3060

0038

4 S

IDE

WA

LLS

ON

3060

0038

5 S

IDE

WA

LLS

ON

3030

0205

4 A

FTE

R V

IBE

3080

0028

1 TV

-20C

3080

0032

6 TV

+50

C

3080

0033

3 TV

+50

C

3080

0044

8 TV

-20C

3080

0044

9 TV

-20C

3080

0057

6 TV

+50

C

3080

0058

3 TV

+20

C

3060

0044

5 P

ISA

3060

0047

5 C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

Y0

X0-1

Y1-2

X2-3

Y3-4

X4-5

Y5-6

X6-7

Y7-8

X8-9

Y9-10

X10-11

Y11-12

X12-13

Y13-14

X14-15

Y15-16

X16-X17

Y17

Z SHIFTS differential

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

3060

0035

7 A

SS

Y J

IG

3060

0038

2 S

IDE

WA

LLS

ON

3060

0038

4 S

IDE

WA

LLS

ON

3060

0038

5 S

IDE

WA

LLS

ON

3030

0205

4 A

FTE

R V

IBE

3080

0028

1 TV

-20C

3080

0032

6 TV

+50

C

3080

0033

3 TV

+50

C

3080

0044

8 TV

-20C

3080

0044

9 TV

-20C

3080

0057

6 TV

+50

C

3080

0058

3 TV

+20

C

3060

0044

5 P

ISA

3060

0047

5 C

AB

LE 6

OK

3980

0027

8 S

LAC

mm

Y0

X0-1

Y1-2X2-3

Y3-4

X4-5

Y5-6

X6-7

Y7-8

X8-9

Y9-10

X10-11

Y11-12

X12-13Y13-14

X14-15

Y15-16

X16-X17

Y17

The software determination of the tray position in Z is poor as shown by the differential plot Z error ~±0.2mm


M.Kuss, A.Brez 12

Tower B resultsTower B results

Y shifts

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

3060

0048

3A

SS

Y J

IG

3060

0051

0S

IDE

WA

LLS

ON

3060

0051

7S

IDE

WA

LLS

ON

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

mm

y0

y1

y2

y3y4

y5

y6

y7

y8

y9

y10

y11y12

y13

y14y15

y16

y17

X shifts

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

3060

0048

3A

SS

Y J

IG

3060

0051

0S

IDE

WA

LLS

ON

3060

0051

7S

IDE

WA

LLS

ON

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

mm

X0

X1

y2

X3

X4

X5

X6

X7

y8

X9

X10

X11

X12

X13

X14

X15

X16

X17

Y rotations

-0.400

-0.300

-0.200

-0.100

0.000

0.100

0.200

0.300

0.400

3060

0048

3 A

SS

Y J

IG

3060

0051

0 S

IDE

WA

LLS

ON

3060

0051

7 S

IDE

WA

LLS

ON

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

mm

y0

y1y2

y3

y4

y5y6

y7

y8

y9

y10

y11y12

y13y14

y15

y16

y17

X rotations

-0.400

-0.300

-0.200

-0.100

0.000

0.100

0.200

0.300

0.400

3060

0048

3A

SS

Y J

IG

3060

0051

0S

IDE

WA

LLS

ON

3060

0051

7S

IDE

WA

LLS

ON

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

#RE

F!

mm

X0X1

X2

X3X4

X5

X6X7

X8

X9

X10

X11X12

X13

X14

X15X16

X17


M.Kuss, A.Brez 13

ConclusionsConclusions

Good data!

Good alignment and parallelism of the trays, typical values in the ±0.2mm range over the whole tower

Very good mechanical stability:•limited alignment loss after sidewalls assy •no alignment loss after vibe, thermo-vacuum, a single sidewall dismounting and shipment to SLAC•Tower B data are slightly better than tower A data

tower a software alignment glast lat project tower a software alignment 28 jan 2005 m.kuss, a.brez1...

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