Tracker Phase 2 Upgrade Meeting, 24 May 2012Report on 2S module mechanics

Refers to work and inputs by Tristan Falcy, Antonio Conde Garcia, Luc Kottelat, Stefano Mersi, Giovanni Bianchi,

Duccio Abbaneo, Andreas Mussgiller, Nick Lumb, Antti Onnela

2S module mechanics, 24 May 2012 Antti Onnela, CERN

2S module geometry updates Module positioning concepts Towards first 2S dummy modules

2S module geometry updates

2S module mechanics, 24 May 2012 Antti Onnela, CERN

“End-cap” and “Barrel” 2S modules• “End-cap” 2S module with 4 mm sensor distance (“air gap”).

– Version under study since 2011, used in FE analysis (Desy) and End-cap geometry studies (Lyon). – Now only minor geometry updates in the module supports and hybrids.

• New “Barrel” 2S module with 1.4 mm sensor distance. – Due geometry effect, for the same track momentum cut the sensor distance in the barrel module shall be

smaller than in the end-cap.

• Updated End-cap and Barrel module 3D models will soon be available in the Upgrade website: https://espace.cern.ch/Tracker-Upgrade/2S-Module/SitePages/Home.aspx

• Following further tracker layout studies these sensor gaps may still evolve in future.2S module mechanics, 24 May 2012 Antti Onnela, CERN

Base-line sensor spacing, following the current TK layout studies:4 mm in “End-cap” modules1.4 mm in “Barrel” modules

Silicon sensor

Silicon sensor

2S modules in barrel (Rod) geometry

• 2 alternatives being studied: Modules upside up or upside down.

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Modules upside down+ Total thickness minimized (here 15 mm), allowing compact barrel layers

+ Components are not exposed (= better protected) in the final assembly

+ Good space for module supports and thermal contacts- Radial distance between adjacent sensors is big.- Difficult access to connectors on the module

Modules upside up+ Radial distance between adjacent sensors is minimized+ Connectors are well exposed- Total thickness is potentially rather big (here 24 mm). Thickness depends directly on the biggest components

- Tight space for module supports and thermal contacts

Module positioning concepts

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Module support and positioning: TOB

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Module

Support structure(Rod)

Positioning

Module support and positioning: TIB

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Support structure(Cylinder)

Module

Positioning

Module

Module support and positioning: TEC

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Support structure(Petal)

Positioning

And the net result with TK precision?

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Already after first cosmic runs the total residuals with Track Based Alignment are at ~50um rms, and improve within 2008 to ~30um.Much better than what the mechanics can (reasonably) do!

Choice of module positioning concept?

• All used module positions solutions in the present Tracker have shown to be sufficiently precise, especially after track-based software alignment.

• TIB / TEC module positioning is more compact and lighter than the TOB solution.

• Use the TIB / TEC solution as basis in the 2S module• Try to also include captive screws, which do not need to be

handled individually during module testing and assembly phases.

2S module mechanics, 24 May 2012 Antti Onnela, CERN

2S module positioning: First thoughts

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Module

Support structure

Positioning

Module placed on supports

Screws tightened

• Positioning similar to TIB/TEC• Captive screws

Towards first 2S dummy modules

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Towards first 2S dummy modules

• Soon we will be able to produce the first dummy modules– Dummy sensors are in procurement

• Include heating, temp measurement, bond pads, positioning targets– Different R&D / dummy versions of other module components will be available.

• How to make first thermo-mechanical tests on the dummy modules?

• One option is to use our ~30 existing spare TOB Rod frames– Carbon fibre structure– Cooling is included– Setups for supporting and cooling rods exist– But, module supports in wrong places for 2S modules Adaptors needed.

2S module mechanics, 24 May 2012 Antti Onnela, CERN

TOB Rod with 2S modules

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Adaptor

2S module

TOB Rod frame

TOB Rod with 2S modules

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Adaptor• First adaptors are being made now.• Will be tried in June with ultra-dummy modules in aluminium.• Then towards more intelligent dummies...

2S module mechanics, 24 May 2012 Antti Onnela, CERN

4 support/cooling contacts in aluminium

3 connection bars in carbon-fibre composite

Summary

• Progressing with 3D modelling of the 2S modules– New updated versions of the Barrel and End-cap 2S modules will be made soon

available (in ~1 week) on the Upgrade Sharepoint site https://espace.cern.ch/Tracker-Upgrade/2S-Module/SitePages/Home.aspx

• Module positioning studies have started– First mechanical samples and tests within June-July

• Producing adaptors for mounting 2S modules on TOB Rod frame.– Will be tried in June.– If proven ok, further adaptors can be made and TOB Rod frames provided for

test use in different labs. Contact me if you are interested in receiving such test material.

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Thank you for your attention.

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Spare slides

2S module mechanics, 24 May 2012 Antti Onnela, CERN

2S module, Jan 2012 version

2S module mechanics, 24 May 2012 Antti Onnela, CERN

3D models by A. Conde Garcia / CERN

Module positioning: TIB

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Inputs from A. Basti / INFN Pisa

Precision insert

Slot insert

Inserts with clearance

Module positioning: TEC

2S module mechanics, 24 May 2012 Antti Onnela, CERN

Inputs from M. Wlochal / Aachen

Module positioning: TOB

2S module mechanics, 24 May 2012 Antti Onnela, CERN