Ultra Low Mass Mechanics with CO 2 Cooling for a Future 4 Layer Barrel Pixel Detector
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Transcript of Ultra Low Mass Mechanics with CO 2 Cooling for a Future 4 Layer Barrel Pixel Detector
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Ultra Low Mass Mechanics with CO2 Cooling for a Future 4 Layer Barrel
Pixel Detector
Silvan Steuli Roland Horisberger
Stefan König
CMS Upgrade Workshop
FNAL
20 Novemer 2008
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Current BPIX Mechanics
• Two identical half shells
• 1 type of fullmodule
• 2 types of halfmodules
• At least 100 different cablelenghts
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Wishlist BPIX mechanics for 2013
• Only one type of modules
• Simpler mechanics
• Two identical half shells
• All modules with same cablelenght
• More clearance between half shells
• Layer 1 closer to beampipe (44mm → 39mm)
• BPIX wheels adjustable in X andY (±3mm)
→ adapt to real situation
→ safer tolerances
• CO2 cooling
• ....
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• 18 faces (the current BPIX layer 1)
• Top face displaced inwards
• Bottom face displaced outwards
• Half shells are not equal
• This design requires: # faces = even number
Possible number of faces
• 16 faces (BPIX Layer 1, 2013)
• Top & bottom faces displaced outwards
• Half shells are equal
• This design requires: # faces = multiple of 4
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New BPIX layout for 2013 (proposal)
• Two identical half shells
• 1 type of fullmodule only
• Layer 1: R 39mm; 16 faces
• Layer 2: R 68mm; 28 faces
• Layer 3: R 109mm: 44 faces
• Layer 4: R 160mm: 64 faces
• Clearance to beampipe 4mm
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Clearance to beampipe support
Insertion:
Minimum clearance to beampipe support is 10.5mm @ z= 1635mm.
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3D view BPIX halfshell mechanics 2013
• Adjustable wheel
Half BPIX detectoronly one endflange shown
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3D view BPIX detector mechanics 2013
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10
0
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10 20 30 40 50
Number of pixel modules in 4 layers system ~1.8 times of old 3 layers system.
coverage of 4 Layer Pixel System
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Transverse View of 4 Layer Barrel with FPIX Envelope
BPIX supply tube
FPIX envelope
BPIX cabling envelope
need approval soon!
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Modified Mechanics for CO2 Cooling
Cooling pipes stainless steel. Diameter d = 1.50mm and wall thickness t = 50m
Layer 1 r=3.9cm
Diamond filled Araldite
pmax = 275 bar safety factor 3 pop = 90bar
d
tp yield2max
Old
New
19 Nov 2008test @ 90 bar
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Temperature Distribution of module around CO2 tube
Temperature profile of halfside of new BPIX module
Silicon Sensor (t=300m) ROC 75 m
C-fibre facets(t= 300m)
heat transfer to tube is ok with reduced option !
ROC Power 120mW2/3 Periphery 2mm1/3 Pixel area 8mm
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Cooling Pipe Connections to Supply Tube
20 coolling loops per half shell 2 m loop length !
Micro-SERTO
Stainless tubesD=1.5mm, t= 50m
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Cassette with rails for pixel-insertion tests
• Corapan rail cassette top lid and top rails not shown
• Rails for FPIX / BPIX
• Ribs to emulate TIB & bulkhead inner envelope
• Cassette made out of Corapan (aluminium-styrofoam sandwich)
• Rails milled out of 15mm PVC plates
• Better studies for further pixel detector installation.
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New wheelset for next shutdown
New detector top wheel
Old detector top wheel
New detector bottom wheel
Old detector bottom wheel
exchangeable spacer
exchangeable spacer
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Summary
• Very low mass mechanics for new 4 layer BPIX looks feasable
• Outer layer 4 has stiffness, layer 1,2 & 3 in very low mass construction
• Long pigtail modules & ultra low mass construction with CO2 cooling should
give large factors in material budget.
• Impact parameter term due to multiple scattering in FPIX region (=1.5–2.3)
should reduce substantial
• New BPIX layout with one module type only # faces = multiple of 4
• Layer 1 radius reduces from 44mm 39mm
• Future BPIX wheelsets adjustable adapt to real beampipe position
• Workout detailed design of new BPIX mechanics and fabricate in 3D stereo
lithography model inclusive new supply tubes insertion tests, clearances !
• Cassette with rails for pixel-insertion tests design completed → fabrication