Concept for Tracker Inner Barrel with Tilted Modules

1Aleksis Chávez Niemelä, CERN

19.6.2013 Forum on Tracking Detector Mechanics at Oxford

Concept for Tracker Inner Barrel with Tilted Modules

4.6.2013

24.6.2013Aleksis Chávez Niemelä, CERN

Contributors

Abbaneo, Duccio Conde García, Antonio Honma, Alan Mersi, Stefano Onnela, Antti Postema, Hans

3Aleksis Chávez Niemelä, CERN

Benefits of tilting the modules

How it works (modelling)

Challenges with this geometry

Mid-section

Ring sections

Few words on rods and end disks (if we have time)

Outline

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Tracker Base-line layout

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PS modules

2S modules

S. Mersi

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Tracker Base-line layout

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Traditionally implemented with rods

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Layout Option with Tilted Modules

PS modules

2S modules

S. Mersi

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Quick comparison of the two layouts

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Base line concept Distinct barrel and end gap geometries Relatively small surface area of the PS

modules not used to greatest extent -> more modules

Tilted module concept Gradual transformation from barrel to

end cap –like geometry PS module surface area better utilized ->

less modules

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Some degree of modularity Reasonable assembly, structures, etc.Reduce the number of modules

Main goals

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Ideal case: module faces always perpendicular to particle tracks

PS module shape facilitates compact inner rings (closest to the beam line

Optimization of the tilted geometry

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Number of modules in the barrel section: 2836 vs. 4164

Less modules -> less material.. Less power consumption Less material in active volume Fewer services required..

Lower cost

Main benefits

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Coordinates generated on an excel table (Duccio Abbaneo, Stefano Mersi)

Copied to a design table in Catia Adjustment by eye (at this stage)

How it works? (modelling)

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..And we get a CAD model

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How it works? (modelling)

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How it works? (modelling)

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Avoid clashes: some geometries simply impossible

Staying ‘close’ to optimal coordinates

Routing of services, cables.. Different support structure needed

as compared to rod assemblies, not much experience

Main challenges

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Ideal solution.. modules are always optimally aligned ..but

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Perpendicular modules

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Clashes, clashes and clashes Deviation from optimal coordinates

required to avoid clashes

Perpendicular modules

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The module positions can be adjusted in various ways:

(Radius) Each module ring can be adjusted individually – but the adjacent ones have to compensate

(Angle) Module pairs – upper and lower modules on the same ring – can also be adjusted

Other adjustments include: coverage and gap

Adjustment

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Deviations from optimal positions and angles necessary to avoid clashes

Module ‘pairs’

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beamline

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Other adjustments

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Upper layer provides hermiticity (one hit)

Lower layer modules can then be tuned for best clearance (with limitation)

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Three layers Layer 1 has less modules than 2

and 3 But is also more packed due to smaller

radius Layer 3 has the most modules

But is slightly ‘easier’ to populate

Layers

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Divide the modules into easy and not so easy sections

For example, most congested modules could form a group..

Sectioning

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Mid section

Rings

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Mid-section

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Mid-section

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Rods

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Rods including a number of modules could form a ring-like structure to cover the mid-section

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..And they could be assembled something like this..

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Rods

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Let’s add some connectors

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Rods

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Mid-section

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Modules after the midsection in +/- direction

Larger gaps between modules More clearance More minimalistic support structure so

save in mass?

(Individual) rings -section

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Cooling pipe between the layers

Ring structures –one approach

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Some cooling inserts..

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Support structure for cooling and

modules

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Combines both layers into one ring unit

Only one cooling pipe Limited weight for the support

structure

Benefits

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35Aleksis Chávez Niemelä, CERN

We can fit the modules but.. How optimal are the coordinates, tilt,

coverage.. Support structures (weight, rigidity) Services (cooling, routing cables)

Dark clouds.. Can the PS module be cooled effectively

Future

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Back up

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Few words on other sections of

the tracker

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We have done preliminary layout exercises with rods and 2S modules

Relying on past experience Cooling under research: pipe,

inserts, contact area..

Rods for the outer barrel

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Few words on other sections of

the tracker

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Research done by Nick Lumb in Lyon

Modules arranged into cocentric disks or into D’s Space required depends on the height of

components Cooling and services also affect the

thickness of the disks

End disks

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Nick is also battling with clashes Especially in the transition from PS to 2S

modules

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End disks

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Thank you!

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