1. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 1 STAR silicon tracking detectors SVT and SSD

2. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 2 Summary of the talk Few words about STAR experiment and SVT Design of the SSD and its elements Ladder and barrel assembly Installation Improvement for ALICE ITS

3. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 3 Few words about STAR experiment and SVT Design of the SSD and its elements Ladder and barrel assembly Installation Improvement for ALICE ITS

4. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 4 Collision of two gold beams

5. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 5 STAR detector

6. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 6 Average radiation length : 4.5%X 0 incl. fee cards SVT Design 3 Barrels : Inner at 6 cm 8 ladders – 4 wafers/ladder Middle at 10 cm 12 ladders – 6 wafers/ladder Outer barrel at 15 cm 16 ladders – 7 wafers/ladder Length : 42 cm 216 wafers wafer FEE

7. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 7 SVT installation in summer 2001

8. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 8 Few words about STAR experiment and SVT Design of the SSD and its elements Ladder and barrel assembly Installation Improvement for ALICE ITS

9. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 9 Silicon Strip Detector

10. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 10 The purposes of the SSD To enhance the STAR tracking performances due to its position resolution and its dE/dx capabilities. To facilitate the connection of the TPC tracks and the hits in the SVT, being closer to the TPC. To improve the tracking efficiency in the central region especially in the low momentum domain and for secondary particles.

11. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 11 The SSD for STAR 20 ladders 16 modules per ladder 491520 analogue channels 1 square meter of double sided wafer Radiation length : 1.1% X0 Length : 1m Diameter : 46 cm  z = 740  m  r  = 20  m

12. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 12 SSD Ladder

13. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 13 Design of the module Silicon Wafer TAB Hybrid Circuit

14. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 14 Design of the silicon wafer Double sided Stereoscopic angle : 35 mrad Thickness : 300 um Active area : 40 mm x 73 mm 768 strips per side Pitch : 95 um N strip insulation : P spray Biasing scheme : punch-through Operating voltage : < 50V Marks for positionning Manufacturer : Eurisys

15. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 15 Readout chip : ALICE128C 6000µm 8700µm Specifications : AMS 1.2 um Input range :  13 MIPs Gain : 50mV/MIP 340 uW/channel Noise : 290 e - + 8 e - /pF JTAG controlled Internal pulse generator

16. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 16 TAB tape This technique has multiple advantages : handling of the chips is easy, test is possible in realistic conditions Flexibility allowing 3D connection Pitch adaptor Industrial standard

17. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 17 ALICE128C on a TAB tape

18. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 18 Module production flow

19. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 19 Detection Module

20. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 20 Detection Module 464 modules produced with a yield of 82%

21. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 21 SSD performances S/N – Pside = 30 S/N – Nside = 20 Digital resolution : 20 μm in transverse plane 740 μm in Z axis

22. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 22 Carbon frame

23. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 23 Ladder cables and connection 3M Z-Axis Adhesive Films

24. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 24 30 MHz BLVDS bus Readout chain One Readout board Readout board : Interface of the barrel to Slow control, Trigger and DAQ Located on the TPC wheel Ribbon cable (1m) shielded cable (2m) 3 MHz on a ladder 10 ADC+C2D2 boards 16 modules (P or N side) C2D2 board : Interface modules/ADC board (analogue signal multiplexed) reference voltage Temperature measurement Latch-up control Bypass module, zero filling instead Technology : board-Flex-board ADC boards : interface Readout boards/ladder power supply distribution Analogue to digital conversion

25. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 25 SSD cooling system : principle

26. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 26 SSD Cooling system : measurement results 10 W 3 W 33.1 o C 33.7 o C 27.6 o C 33.2 o C 30.7 o C 24.5 o C 25.1 o C 30.9 o C 27.8 o C 19 o C 29 o C

27. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 27 Power supply of one ladder One ladder P side low voltage power supply (floating)N side low voltage power supply (floating) Biasing voltage Power supply of the readout board and the non floating part of the ADC board

28. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 28 Few words about STAR experiment and SVT Design of the SSD and its elements Ladder and barrel assembly Installation Improvement for ALICE ITS

29. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 29 Ladder assembly flow One ladder /week 3 persons First ladder : 3 weeks 3 last ladders in 1 week (5 persons) Ladder frames Module placing on the assembly bench Visual inspection Placing and gluing the carbon ladder on top of the modules Soldering of the cables to the module Functional and Noise test Ladder cables Visual inspection Electrical test Packaging and storage until barrel assembly Module s Visual inspection Noise test ADC & C2D2 boards Visual inspection Electrical test Ladder pre-assembly Functional and Noise test

30. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 30 Ladder assembly

31. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 31 Ladder views

32. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 32 Sector assembly

33. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 33 One sector

34. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 34 SSD database You can visit it at : http://wwwstar-sbg.in2p3.fr/index.php

35. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 35 Few words about STAR experiment and SVT Design of the SSD and its elements Ladder and barrel assembly Installation Improvement for ALICE ITS

36. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 36 SSD installation

37. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 37 Milestones of the project Design started in 1997 Technical proposal approved in 1998 by STAR Five modules prototypes in 2000 First ladder produced and installed in 2002 first half installed summer 2003 Installation completed in summer 2004

38. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 38 Few words about STAR experiment and SVT Design of the SSD and its elements Ladder and barrel assembly Installation Improvement for ALICE ITS

39. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 39 Semi-automatic assembly bench

40. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 40 Graphic user interface

41. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 41 Soldering bench

42. stephane.bouvier@subatech.in2p3.frCBM Workshop on Silicon Detector Systems, April 18-20 at GSI Darmstadt 42 END Thank you