1. Radiation Laboratory Meeting
VTX Pixel Status
Radiation Laboratory Meeting
17th Oct 2013

2. 1. Status in Run13 and after Run13
EAST side of VTX were removed because of a leak problem for Strip cooling tube.
It was happened due to the corrosion of cooling pipes.
At that point, we decided to repair EAST pixel ladders.
Repair work had been done at Hayashi Tokei Company.
Fifteen ladders whose bonding wires were broken in Run-11 and 12 had been repaired.
The yield of the repairing was almost 100%.
All ladders were tested at RIKEN and shipped to BNL for assembly of EAST layer 1.

3. Initial Schedule of Repair Work for 15 ladderson Jun.6
Crack repairment at HAYASHI
Wiring at HAYASHI
Test at RIKEN
Encapsulating at HAYASHI
Export to BNL
Slide From Torii-san and Sumita-san
Jun.6
April
May
June
July
August
Ladder ID
W14
W15
W16
W17
W18
W19
W20
W21
W22
W23
W24
W25
W26
W27
W28
W29
W30
W31
W32
W33
W34
W35
W36
#18,19,21,22 #9
#23
#25
#26
#27
#28
#29
#31
#33
#12
#14
5-May
2-Jun
7-Jul
4-Aug
1-Sep

4. Finished as it was scheduled!!!!
Crack repairment at HAYASHI
Wiring at HAYASHI
Test at RIKEN
Extensive Test at RIKEN
Encapsulating at HAYASHI X
Suspended or Under diagonostic repairment
Export to BNL
In Reality
Finished as it was scheduled!!!!
Finish
April
May
June
July
August
Ladder ID
W14
W15
W16
W17
W18
W19
W20
W21
W22
W23
W24
W25
W26
W27
W28
W29
W30
W31
W32
W33
W34
W35
W36
#18,19,21,22 #9
#23
#25
Holidays
#26 X
#27
#28
#29
#31
#33
#12
#14
5-May
2-Jun
7-Jul
4-Aug
1-Sep

5. 4.0 chips 1.5 chips 1.0 chips 5/31 BNL 7/19 BNL 8/7 BNL 8/14 BNL

6. 2. Issue in Run-13 Back side view of WEST-B1
The burb fitting of cooling manifold of WEST layer1 was broken on 29th Apr.
Cooling tube : TIGON tube
Burb fitting : Peak material
Cause
Overstress from the bending tube
Solution
Replace with new manifolds
Modify the shape to reduce stress

7. 3. Summary of Current Status
All cooling manifolds were replaced with new ones for all pixel layers.
In Run-13, a burb fitting of manifold was broken due to overstress.
Shape of manifolds were modified to minimize the stress.
After attaching manifolds, pressure test had been done for all layers.
Assembly of EAST layer 0 and 1 had been done.
All ladders for EAST barrel were replaced with repaired ladders.
We made an arrangement of the position of each ladders on layer 0 and 1.
Electrical test of WEST layer0/1 and EAST layer0 had been done.
Live area for each ladder of WEST layers was same as that in Run13.
Live area for each ladder of EAST layer0 was almost same as that in Sr90 test at BNL.

8. To Do before moving to IR
4. Status of Barrel Assembly
To Do before moving to IR
WEST B0 B1
EAST
Mounting ladders on a barrel mount frame
No replacement
Done
Attaching manifolds
Pressure test
On-going
Repair leak with glue if it’s found
No need
Electrical test
Mate both layers
Ready
Not Ready
Mate with Strip barrels
Attaching big wheels (SPIROs)
Final electrical test

9. Assembled Layers (Mounting Ladders and Attaching Manifolds)
WEST-B0
WEST-B1
EAST-B0
EAST-B1
manifold

10. Pressure Testing
Each layer were pressurized with N2 gas (40Psi) and measured pressure drop.
Estimation of leak amount for gas
Layer 0 of EAST and WEST
0.5 cc/day for WEST : OK
0.8 cc/day for EAST : OK
Layer 1 of EAST and WEST
5 cc/day for WEST-Top : OK
8 cc/day for WEST-Bottom : OK
4 cc/month for EAST-Top : OK
xxx cc/day for EAST-Bottom : FAILED

11. Leak Location Cooling support for pixel ladders WEST layer 0 : No leak
Burb fitting
Mount block
Leak Location
WEST layer 0 : No leak
EAST layer 0 : No leak
WEST layer 1 : 2 locations
EAST layer 1 : 4 locations
Leak is fixed by painting epoxy glue around the leak location.
Input/Output pressure of VTX is about 26/12 Psi at IR.

12. Electrical Testing
To confirm if there are any broken channels or not, electrical test had been done for all pixel ladders.
Test items are current consumption of ladder, bias current of sensors and response from test pulse and noise.
Pedestal hit distribution

13. 5. Remained Tasks Pressure test for EAST layer 1 bottom (few days).
Electrical test for EAST layer 1 (1 day).
Mate of WEST and EAST pixel layers (half day).
Mate of pixel and strip barrel (half day).
Attach of Big Wheel (SPIROs) (1 day).
Final electrical test for all pixel layers to confirm the electrical connection of bus cables (5 days).
Layer 0
Layer 1
Pixel barrel
Big wheel

14. 5. Strip WEST B2 WEST B3 EAST B3
WEST layer 2 and 3 are almost ready for mating.
Electrical test of strip ladders for EAST layer 2 is on-going.
Pressure test for EAST layer 3 is on-going

15. 6. Summary
Repair work of ladders for EAST barrel had been done successfully.
All pixel layers except for EAST layer 1 are ready for mating.
Pressure test and electrical test had been done.
Live area for all ladders were same as previous live area.
VTX will be ready to move to IR on early November.

16. Back Up Slides

17. 5. Hit Map of WEST layer 0 in Run13

18. 5. Hit Map of WEST layer 1 in Run13

19. Hit Map of EAST Layer 0 (Tested at BNL before Assembly)
Data were taken with Sr90
CA acceptance
TOP
SOUTH
NORTH
White Area
chip15
chip0
L25 11%
L %
L %
L %
L %
Wire side is bottom
Ladder39 : Not repaired ladder
BOTTOM
Blue : TEST at BNL

20. East Barrel 1 Candidates (Test at BNL before Assembly)
CA acceptance
White Area
TOP
chip15
chip0
L18 12%
L30 13%
L33 13%
L %
L22 13%
L27 13%
L12 10%
L26 12%
L14 12%
L21 19%
Ladder30 : Not repaired ladder
Chip14-15 of Ladder26 are not recoverable
Chip3 of Ladder14 is not recoverable
Chip 15 is dead chip
Blue : TEST at BNL

21. Spare (Test at BNL)
White Area
chip15
chip0
L29 17%
L28 20%

22. 3. Issue in Run-13 Normal Powered off B1 Ladder 5 – Ladder 9 Hot Dead
Sensor 3
Sensor 2
Sensor 1
Sensor 0
Chip 3
Chip 2
Chip 1
Chip 0
Normal
Powered off
B1 Ladder 5 – Ladder 9
Hot
B1-L4-S
Dead
Known
dead
Chip ID = Layer*5*4*4 + Ladder*4*4 + sensor*4 + chip
B1: Ladder 0 – Ladder 4
B0 : Ladder 0 – Ladder 4
B0-L2-S, B0-L3-N/S, B0-L4-N/S
RUN ID
3/10
6/10
Leak problem was found for B1 top (manifold for ladder5 – ladder9) 4/29
Behavior of some ladders became unstable.

23. Cause of unstable behavior.
Data cables from unstable ladders are connected to FEMs that the power-offed ladders are connected to.

24. Production of New Ladders