1. Pixel Upgrade Phase I CMS Upgrade Week 27. April 2010 R. Horisberger, PSI

3. Pixel Detector System (Barrel & Forward) Beam pipe bake out  insertion/removal of pixel detector Supply tube : power, cooling & optical links AOH & DOH boards FPIX BPIX Installation BPIX & FPIX in July 2008 few days each ! FPIX removal and reinsertion in Spring 09 was fast ! New 4 Layer Pixel System should exploit potential new beam pipe! however, stay compatible with present beam pipe!  Worm gear

4. CMS BPIX in Installation Cassette Inner shield (C-fibre + Al-foil)

5. Tolerances for insertion are mm !  any new detector must stay within exact mechanical dimensions

6. Present BPIX System Central beam pipe section has: cylindrical Beryllium pipe length = +/- 180cm r inner =29mm, t wall = 800  m conical stainless stell section  = 4.6 Tolerance budget during insertion is critical issue Layer Radius 1 44mm 2 73mm 3 102mm Clearance in end- position ~ 7.5mm Inner shield r i = 37.3mm

7. Material Tomography by Hadronic Interactions (Gouzevitch)

8. Beam pipe r outer = 29.8mm Inner shield r inner = 37.3mm Displacement (observed) Shield to beam pipe Horizontal: 2.7 mm Vertical : 1.7 mm Material Tomography by Hadronic Interactions (Gouzevitch) 4.3mm 10.7mm Beam displaced ~2mm asymmetric to pipe! Why ? We have no idea !

9. BPIX Upgrade Baseline (2015)  1216 modules (1.6 x present BPIX) (present) Keep present tolerances need R=25mm pipe

10. Worm Gear Adjustment of BPIX For next pixel detector needs position adjustable ball bearing rollers Compensate for deviations of beam pipe to tracker mechanics (pixel rails) Close detector in final position around actual beam pipe position Propose to use worm gear mechanics (remote adjustement ) for closing half shells around beam pipe.

11. Worm Gear Adjustment of BPIX For next pixel detector needs position adjustable ball bearing rollers Compensate for deviations of beam pipe to tracker mechanics (pixel rails) Close detector in final position around actual beam pipe position Propose to use worm gear mechanics (remote adjustement ) for closing half shells around beam pipe.

12. Worm Gear Adjustment of BPIX For next pixel detector needs position adjustable ball bearing rollers Compensate for deviations of beam pipe to tracker mechanics (pixel rails) Close detector in final position around actual beam pipe position Propose to use worm gear mechanics (remote adjustement ) for closing half shells around beam pipe.

13. Worm Gear Adjustment of BPIX For next pixel detector needs position adjustable ball bearing rollers Compensate for deviations of beam pipe to tracker mechanics (pixel rails) Close detector in final position around actual beam pipe position Propose to use worm gear mechanics (remote adjustement ) for closing half shells around beam pipe.

14. Worm Gear Adjustment of BPIX For next pixel detector needs position adjustable ball bearing rollers Compensate for deviations of beam pipe to tracker mechanics (pixel rails) Close detector in final position around actual beam pipe position Propose to use worm gear mechanics (remote adjustement ) for closing half shells around beam pipe.

15. Worm Gear Adjustment of BPIX For next pixel detector needs position adjustable ball bearing rollers Compensate for deviations of beam pipe to tracker mechanics (pixel rails) Close detector in final position around actual beam pipe position Propose to use worm gear mechanics (remote adjustement ) for closing half shells around beam pipe.

16. Mechanical Pilot-Detector for Measurement Propose worm-gear adjustable mechanical Pilot Detector Just prior to installation perform measurement and adjustment to actual position

17. Weight of 2008 Pixel System with Supply Tube 10 0 20 4060 80100 BPIX supply tube DOH & AOH mother board + AOH’s Power board endflange prints Layer 3 & 1+2  = 2.16 Total weight of 2008 BPIX within  <2.16 : 16’894 g ~ 16.9Kg 2 Barrels & 4 Supply Tube Sections & Fluid & Cables  = 2.16

18. BPIX & Supply Tube with AOH, DOH, PCBs & Fibres

19. Weight of 2015 Phase 1 Pixel System (4 layers) Total weight of 2014 4 Layer BPIX within  <2.16 : 6454 g ~ 6.5 Kg 2 Barrels & 4 Supply Tube Sections & CO 2 & Cables 10 0 20 4060 80100 DOH & AOH boards start at z=1260mm   = 2.59 Foam & C-fibre ribs [cm] Plugs Layer 3&4 Plugs Layer 1&2  = 2.16 Ratio (3 Layers 2008 / 4 layers 2015) ~ 2.62 Weight of TIB/TID ~ 430 Kg