Pixel Upgrade Phase I

CMS Upgrade Week

27. April 2010

R. Horisberger, PSI

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

CMS BPIX in Installation Cassette

Inner shield (C-fibre + Al-foil)

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

Present BPIX System Central beam pipe section has:

• cylindrical Beryllium pipe length = +/- 180cm

rinner=29mm , twall = 800m

• 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 ri = 37.3mm

Material Tomography by Hadronic Interactions (Gouzevitch)

Beam pipe router = 29.8mm

Inner shield rinner = 37.3mm

Displacement (observed)

Shield to beam pipe

Horizontal: 2.7 mmVertical : 1.7 mm

Material Tomography by Hadronic Interactions (Gouzevitch)

4.3mm

10.7mm

Beam displaced ~2mm asymmetric to pipe!

Why ? We have no idea !

BPIX Upgrade Baseline (2015) 1216 modules (1.6 x present BPIX)

(present)

Keep present tolerances need R=25mm pipe

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.

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.

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.

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.

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.

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.

Mechanical Pilot-Detector for Measurement

• Propose worm-gear adjustable mechanical Pilot Detector

• Just prior to installation perform measurement and adjustment to actual position

Weight of 2008 Pixel System with Supply Tube

10

0

20

20 40 60 80 100

BPIX supply tube

DOH & AOH mother board+ AOH’s

Power board endflange printsLayer 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

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

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 & CO2 & Cables

10

0

20

20 40 60 80 100

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