concept for tracker inner barrel with tilted modules
DESCRIPTION
Concept for Tracker Inner Barrel with Tilted Modules. 19.6.2013 Forum on Tracking Detector Mechanics at Oxford. Abbaneo, Duccio Conde García, Antonio Honma, Alan Mersi, Stefano Onnela, Antti Postema, Hans. Contributors. Aleksis Chávez Niemelä, CERN. 4.6.2013. - PowerPoint PPT PresentationTRANSCRIPT
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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10Aleksis Chávez Niemelä, CERN
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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15Aleksis Chávez Niemelä, CERN
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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21Aleksis Chávez Niemelä, CERN
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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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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