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Hcal
Geometry and Assembly
CLIC Meeting - LAPP
December 2008, 15th
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Clic meeting - 15/12/2008 Nicolas Geffroy 2
Study of a new Hcal geometry……motivation: « cracks »
in the calorimeter
Classical geometry
( muons are lost, hadrons ? )
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Clic meeting - 15/12/2008 Nicolas Geffroy 3
Study of a new Hcal geometry…
Same internal & external boundaries (2 regular dodecagons)
Projective configuration Tilted configuration
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Clic meeting - 15/12/2008 Nicolas Geffroy 4
Proposal of Hcal assembly
Detail of 2 modules
Detection layer
Steel interaction plate
Stairs shape
Objective : to fix the steel plates together to obtain a structure in which the detection layers can be inserted (like drawers).
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Clic meeting - 15/12/2008 Nicolas Geffroy 5
Proposal of Hcal assembly
Detail of a module assembly
Using of several stringers along the modules to fix the steel interaction plates together
Complementary shapes
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Clic meeting - 15/12/2008 Nicolas Geffroy 6
Study of a new Hcal assembly…
Left-shifted stringers
Right-shifted stringers
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Clic meeting - 15/12/2008 Nicolas Geffroy 7
Proposal of Hcal assembly
Shifted stringers Gain of volume / No “air” gap
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Clic meeting - 15/12/2008 Nicolas Geffroy 8
Study of a new Hcal assembly…
To realize a belt to fix the modules together thanks to screws
Possibility of multiple belts along the length of the barrel !
NB: Belt maybe out of scale…
Drawback : increase of the overall dimension
Belt
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Clic meeting - 15/12/2008 Nicolas Geffroy 9
Study of a new Hcal assembly…
Possibility of several belts along the barrel, whose shapes could be full
rectangular, or I profile, etc…Cf. Atlas experiment
Cf. DELPHI
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Clic meeting - 15/12/2008 Nicolas Geffroy 10
Study of a new Hcal assembly…
Integration with ECAL
No crack in the 2
detectors
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Clic meeting - 15/12/2008 Nicolas Geffroy 11
Study of a new Hcal assembly…
3D view
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Clic meeting - 15/12/2008 Nicolas Geffroy 12
Study of the Hcal forward
Face viewTop view
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Clic meeting - 15/12/2008 Nicolas Geffroy 13
Study of the Hcal forward
Top view
Beam axis
Only absorbers are represented
Minimize the space betwwen the 2 absorbers of the same plane
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Clic meeting - 15/12/2008 Nicolas Geffroy 14
Study of the Hcal forwardAssembly procedure
Muons detector
The first 2 absorbers are fixed on the muon detector
Blue parts are screwed on absorbers
Their thicknesses are the same than the ones of chambers, i.e. 8 mm !
The following absorbers are screwed on the blue parts
Counterbored holes in spacers (blue parts)
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Clic meeting - 15/12/2008 Nicolas Geffroy 15
Study of the Hcal forward
Chambers insertion
No crack in the Hcal end-cap
Planes of the blue parts are non projective
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Clic meeting - 15/12/2008 Nicolas Geffroy 16
Study of the Hcal forward
Inserted from the left
Inserted from the right
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Clic meeting - 15/12/2008 Nicolas Geffroy 17
Study of the Hcal forward
Chambers insertion
3D view
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Clic meeting - 15/12/2008 Nicolas Geffroy 18
Prospects
Perform Finite Element Analyses (FEA) :
• Computations of displacements/stresses of the structure
check stresses near the fixation locations: Fixation of the Ecal modules on the base of Hcal modules. Fixation of the whole structure on the cryogenic magnet.
check displacements of the structure : displacements of the modules with respect to the beam axis. displacements of the interaction plates (sufficient margin between 2 consecutives interaction plates to insert chamber).
• Optimization of the stringers thickness(= maximization of the size of the chambers)
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Clic meeting - 15/12/2008 Nicolas Geffroy 19
Prospects
Tungsten Stainless Steel
Absorption length λ (mm) 95.855 167.598
4.5 x λ (mm) 431.3 754.2
Absorber thickness (mm) 10.8 18.9
1 layer thickness (mm) 18.8 26.9
Calorimeter thickness (mm) 752 1076
External radius (mm) 2247 2583
NB : absorber thickness depends on the number of layers: 40 layers in this case !
Hcal made of Tungsten will be obviously more expensive than using Stainless Steel.
Nevertheless it drastically reduces the cost of the solenoid and the muon system !
OPTIMIZATION (need for physic simulation…)
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Clic meeting - 15/12/2008 Nicolas Geffroy 20
Prospects
Hcal & Ecal divided into 16 modules
Other configuration :
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Clic meeting - 15/12/2008 Nicolas Geffroy 21
Last comments
• The Hcal modules are not projective, but internal cracks can appear (due to bad layout of chambers).
• The modules must be fixed together, the Hcal has to be inserted and fixed inside the coil.
Spaces / clearances for Mechanics (and services) must be taken into account !
The external radius of the Hcal is NOT given by the circle which passes through the tip of the last chamber…
To take into consideration in Physics simulation !!!
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Clic meeting - 15/12/2008 Nicolas Geffroy 22
Prospects
16 modules configuration :Hcal structure still symmetric
Drawback : 16 spaces without detection (+4)
Advantages :
Smaller modules= smaller interaction plates & chambers
Stiffer modules (less problem of flexion)
Thinner stringers (smaller spaces without detection)
Lighter modules (manoeuvrability)
Reduction of loads (force & torque)
on each Hcal module (due to Ecal modules)
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Clic meeting - 15/12/2008 Nicolas Geffroy 23
Study of a new Hcal assembly… Wouldn’t it be possible to put locking devices
at 5 & 7 o’clock ?
Maybe more simple parts at 5&7 o’clock than 3&9 o’clock (compression and no torque…no flexion!)
Maybe a great benefit considering the overall dimension (magnet internal radius)
DELPHI
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Clic meeting - 15/12/2008 Nicolas Geffroy 24
Study of a new Hcal assembly… Wouldn’t it be possible to put fixation devices
at 5 & 7 o’clock ?
Case of a fixation at 3 o’clock :
Parts really under-estimated (because of torques, etc…)
Parts under compressionMinimal magnet internal radius ???