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Upgrade Phase II Mechanics meeting, 21 March 2013Upgrade TOB (Tracker Outer Barrel) design

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

Duccio Abbaneo, Andreas Mussgiller, Nick Lumb, Riikka Häsä, Aleksis Chávez Niemelä, Antti Onnela

Upgrade Phase II Mechanics, 21 March 2013, indico: 240514 Antti Onnela, CERN

Design concept Advantages and Challenges of this design Today status of the design Next tasks

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Design concept

Bases on re-using the current TOB design• 1 support wheel• Rods installed from the two ends

Upgrade Phase II Mechanics, 21 March 2013, indico: 240514 Antti Onnela, CERN

PS modules

2S modules

2S module

Rod with 2S modules

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Advantages and Challenges of this design

Advantages:• Reuse of existing and proven solutions reduces uncertainties in planning the project.• Helps reaching results efficiently, with limited resources.

– Liberates resources for the PS detector work, where more attention is clearly needed now.• A mature design, with details well understood , helps in optimisation (e.g. for

minimizing mass, reducing costs).

Challenges:• In order to fit in the Wheel the Rods can have only a limited thickness + width • The space for the modules and services in the Rod is therefore limited.

– A major constraint to the module design, including service components (DC-DC, optolink)• Need to design and build stiff, stable, and geometrically precise Rods.• Efficient and reliable (!) cooling for every module.

– One of the current TOB cooling circuits has a big leak, and must be off. We have no idea where that leak is.

• To reach the needed geometrical precision in the Wheel, high-quality tooling and careful assembly work are mandatory.

• Access to the Modules and Rods in the assembled Wheel is close to impossible. – Assembled Rods must be rigorously pre-tested to minimize risks of later discovery of

problems.Upgrade Phase II Mechanics, 21 March 2013, indico: 240514 Antti Onnela, CERN

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Today status of the Upgrade-TOB design

First studies done on• Module + Rod integration

– Seems doable, but with very tight clearances (like in the original TOB…).

• Module positioning concepts and precision.

• Thermal contacts between Modules and cooling pipe

• Mechanical properties of adhesives used in cooling pipe contacts.

• Adaptors for holding 2S modules on existing spare TOB rods.

Upgrade Phase II Mechanics, 21 March 2013, indico: 240514 Antti Onnela, CERN

These studies were done in mid-2012. In the past 6 months design efforts concentrated in 2S and PS module designs, no work done recently on the Upgrade-TOB.

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Next tasks

• Update the Rod 3D models with the current version of the 2S module• Prepare a 3D model of the Upgrade-TOB Wheel• Study the cooling pipework, including manifolding and connections.• Re-study and improve the Module supports geometry for thermal performance.

A CERN designer, Jordan Degrange, is starting now at 20% level to support the CMS TK Upgrade project, with the Upgrade-TOB 3D modelling as the first task.

Upgrade Phase II Mechanics, 21 March 2013, indico: 240514 Antti Onnela, CERN

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Thanks for your attention

Upgrade Phase II Plenary, 20 July 2012, indico: 197208 Antti Onnela, CERN