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

1. Tracker Phase 2 Upgrade Meeting, 24 May 2012Report on 2S module mechanicsRefers 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 geometry updates • Module positioning concepts • Towards first 2S dummy modules Antti Onnela, CERN

2. 2S module geometry updates Antti Onnela, CERN

3. “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. Silicon sensor Base-line sensor spacing, following the current TK layout studies: 4 mm in “End-cap” modules 1.4 mm in “Barrel” modules Silicon sensor Antti Onnela, CERN

4. 2S modules in barrel (Rod) geometry • 2 alternatives being studied: Modules upside up or upside down. • 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 • 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 Antti Onnela, CERN

5. Module positioning concepts Antti Onnela, CERN

6. Module support and positioning: TOB Module Positioning Support structure (Rod) Antti Onnela, CERN

7. Module support and positioning: TIB Positioning Module Support structure (Cylinder) Antti Onnela, CERN

8. Module support and positioning: TEC Module Positioning Support structure (Petal) Antti Onnela, CERN

9. And the net result with TK precision? Already after first cosmic runs the totalresiduals with Track Based Alignment are at ~50um rms, and improve within 2008 to ~30um. Much better than what the mechanics can (reasonably) do! Antti Onnela, CERN

10. 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. Antti Onnela, CERN

11. 2S module positioning: First thoughts • Positioning similar to TIB/TEC • Captive screws Module placed on supports Module Positioning Screws tightened Support structure Antti Onnela, CERN

12. Towards first 2S dummy modules Antti Onnela, CERN

13. 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. Antti Onnela, CERN

14. TOB Rod with 2S modules 2S module Adaptor TOB Rod frame Antti Onnela, CERN

15. TOB Rod with 2S modules Antti Onnela, CERN

16. Adaptor • First adaptors are being made now. • Will be tried in June with ultra-dummy modules in aluminium. • Then towards more intelligent dummies... 3 connection bars in carbon-fibre composite 4 support/cooling contacts in aluminium Antti Onnela, CERN

17. 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 sitehttps://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. Antti Onnela, CERN

18. Thank you for your attention. Antti Onnela, CERN

19. Spare slides Antti Onnela, CERN

20. 2S module, Jan 2012 version 3D models by A. Conde Garcia / CERN Antti Onnela, CERN

21. Module positioning: TIB Inputs from A. Basti / INFN Pisa Inserts with clearance Precision insert Slot insert Antti Onnela, CERN

22. Module positioning: TEC Inputs from M. Wlochal / Aachen Antti Onnela, CERN

23. Module positioning: TOB Antti Onnela, CERN