19.6.2013 Forum on Tracking Detector Mechanics at Oxford Aleksis - - PowerPoint PPT Presentation

19 6 2013 forum on tracking detector mechanics at oxford
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19.6.2013 Forum on Tracking Detector Mechanics at Oxford Aleksis - - PowerPoint PPT Presentation

19.6.2013 Forum on Tracking Detector Mechanics at Oxford Aleksis Chvez Niemel, CERN 1 4.6.2013 Abbaneo, Duccio Conde Garca, Antonio Honma, Alan Mersi, Stefano Onnela, Antti Postema, Hans Aleksis Chvez Niemel,


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19.6.2013 Forum on Tracking Detector Mechanics at Oxford

4.6.2013 Aleksis Chávez Niemelä, CERN 1

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2 4.6.2013 Aleksis Chávez Niemelä, CERN

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

4.6.2013 3 Aleksis Chávez Niemelä, CERN

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4.6.2013 Aleksis Chávez Niemelä, CERN

PS modules 2S modules

4

  • S. Mersi
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  • Traditionally implemented with

rods

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4.6.2013 6 Aleksis Chávez Niemelä, CERN

PS modules 2S modules

  • S. Mersi
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4.6.2013 Aleksis Chávez Niemelä, CERN

  • 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

7

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

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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

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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

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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)

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  • ..And we get a CAD model

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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

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  • Ideal solution.. modules are always
  • ptimally aligned ..but

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  • Clashes, clashes and clashes
  • Deviation from optimal coordinates

required to avoid clashes

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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

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  • Deviations from optimal positions

and angles necessary to avoid clashes

4.6.2013 Aleksis Chávez Niemelä, CERN

beamline

18

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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

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  • Divide the modules into easy and

not so easy sections

  • For example, most congested

modules could form a group..

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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..

4.6.2013 25 Aleksis Chávez Niemelä, CERN

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  • Let’s add some connectors

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  • Modules after the midsection in

+/- direction

  • Larger gaps between modules
  • More clearance
  • More minimalistic support structure so

save in mass?

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  • Cooling pipe between the layers

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  • Combines both layers into one ring

unit

  • Only one cooling pipe
  • Limited weight for the support

structure

4.6.2013 34 Aleksis Chávez Niemelä, CERN

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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

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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..

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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

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

modules

4.6.2013 41 Aleksis Chávez Niemelä, CERN

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4.6.2013 42 Aleksis Chávez Niemelä, CERN