2S module geometry updates Module positioning concepts Towards first 2S dummy modules
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Transcript of 2S module geometry updates Module positioning concepts Towards first 2S dummy modules
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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
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2S module geometry updates
2S module mechanics, 24 May 2012 Antti Onnela, CERN
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“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
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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
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Module positioning concepts
2S module mechanics, 24 May 2012 Antti Onnela, CERN
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Module support and positioning: TOB
2S module mechanics, 24 May 2012 Antti Onnela, CERN
Module
Support structure(Rod)
Positioning
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Module support and positioning: TIB
2S module mechanics, 24 May 2012 Antti Onnela, CERN
Support structure(Cylinder)
Module
Positioning
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Module
Module support and positioning: TEC
2S module mechanics, 24 May 2012 Antti Onnela, CERN
Support structure(Petal)
Positioning
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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!
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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
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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
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Towards first 2S dummy modules
2S module mechanics, 24 May 2012 Antti Onnela, CERN
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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
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TOB Rod with 2S modules
2S module mechanics, 24 May 2012 Antti Onnela, CERN
Adaptor
2S module
TOB Rod frame
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TOB Rod with 2S modules
2S module mechanics, 24 May 2012 Antti Onnela, CERN
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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
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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
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Thank you for your attention.
2S module mechanics, 24 May 2012 Antti Onnela, CERN
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Spare slides
2S module mechanics, 24 May 2012 Antti Onnela, CERN
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2S module, Jan 2012 version
2S module mechanics, 24 May 2012 Antti Onnela, CERN
3D models by A. Conde Garcia / CERN
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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
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Module positioning: TEC
2S module mechanics, 24 May 2012 Antti Onnela, CERN
Inputs from M. Wlochal / Aachen
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Module positioning: TOB
2S module mechanics, 24 May 2012 Antti Onnela, CERN