barrel sct material budget by alessandro tricoli ral atlas physics meeting, 18 th march 2008
TRANSCRIPT
Barrel SCT Material Budget
By
Alessandro Tricoli
RAL ATLAS Physics meeting, 18th March 2008
Alessandro Tricoli, RAL 2RAL ATLAS Physics, 18th March 2008
Overview
ID gas barrier
EC SCT
Barrel SCT
PP0
PPF1
PP1b
PP1a
PPB1
PPF0
PPB0
Z = 0
R=1150 mm
R=3405 mm
Procedure to estimate the SCT material budget Documentation
End-Caps by Stephen Haywood Barrel On-Barrel Services
comparison with weight measurements
Off-Barrel Services (radial & along inner cryostat wall)
Alessandro Tricoli, RAL 3RAL ATLAS Physics, 18th March 2008
Bottom-up estimate: collect weights and compositions for each item including screws, washers, nuts etc.
Input information is collected from engineers who designed and built the detector: using drawings and measured weights or CAD masses when no measurement is available.
Collection of Material info
When possible we compare our bottom-up estimate to measured weights of sub-detectors:
top-down estimate: weigh the whole sub-detector with extra temporary bits (i.e. support
structures,
trolley etc.) then subtract weight of extra bits.
Barrel Thermal Enclosure
B6 BearingHSP
Alessandro Tricoli, RAL 4RAL ATLAS Physics, 18th March 2008
When raw data is collected materials are grouped into volumes to implement in GeoModel.
constraints: balance between having fine granularity and minimising number of volumes to avoid slowing down simulation have a realistic detector in the simulation avoiding clashes between sub-detector volumes (keeping also clearances for misalignments)
Material Volumes suggested by A. T. are passed to Pat W. and Vadim K. for coding into GeoModel
All materials shown today are included in G4 detector geometry CSC-03-00-00
Modelling for Simulation
Alessandro Tricoli, RAL 5RAL ATLAS Physics, 18th March 2008
Documentation Raw material data and simulation models are available on the SCT Material Budget web page http://hepwww.rl.ac.uk/atlas-sct/engineering/material_budget/
Barrel Section with: derived models: on-barrel and off-barrel services
link to taka Kondo web page for Modules (not discussed here)
X0 plots from Model: using simplified geometries X0 plots from Pat Ward using Geantino (geometry as in G4)
Comparison bottom-up mass estimate with top down measurement for barrel SCT links to raw information from engineers
ATLAS note being written: common for barrel & end-cap services
Alessandro Tricoli, RAL 6RAL ATLAS Physics, 18th March 2008
On-Barrel ServicesBottom-up estimate
Modules done by Taka Kondo (not discussed here)
Tracking Volume Services for B3, B4, B5,B6:
Carbon Fibre Cylinders including flanges and end-clamps
Cooling Loops: pipes, inlet connectors, exhaust manifolds, U-bends, cooling blocks
Module support Brackets
Harnesses and Doglegs
Example: excel sheet for CFRP Cylinder and Flange
Alessandro Tricoli, RAL 7RAL ATLAS Physics, 18th March 2008
On-Barrel Services (pictures) B3
Module
Dogleg
Cooling Block
Cooling Inlet
Cooling Outlet (manifold)
Cooling pipe
Optical FibresDogleg LMTs
Harness (LMTs, Dogleg, Fibers)
Bracket
Cylinder
Alessandro Tricoli, RAL 8RAL ATLAS Physics, 18th March 2008
On-Barrel Services (masses)
On-Barrel Services
B3 B4 B5 B6 TOT
Mass (Kg) 13.96 17.79 21.58 25.10 78.44
Taka Kondo Module Mass: 24.74 g Average module’s mass 52.26 Kg Total mass for the whole barrel SCT.
Components Breakdown
0
0.05
0.1
0.15
0.2
0.25
0.3
0
0.2
0.4
0.6
0.8 1
1.2
1.4
1.6
1.8 2
2.2
2.4
2.6
2.8 3
3.2
3.4
Modules
Harness & Doglegs &EndClamps
Brackets
Cooling
Cylinders
Barrel Services (no modules)
0
0.05
0.1
0.15
0.2
0.25
Barrel 6 (only Services)
Barrel 5 (only Services)
Barrel 4 (only Services)
Barrel 3 (only Services)
All barrel layers are treated similarily: main differences in multiplicity of objects (no. modules, brackets, cooling loops, cylinder radii etc.)
modules are the largest single contribution
X0 Plots vs From Model:Simplified det. geometry(disks & barrels)
Alessandro Tricoli, RAL 9RAL ATLAS Physics, 18th March 2008
On-Barrel Services (X0 plots in G4)
Smeared vertexComponent-by-component
Smeared vertexStacked components
By Pat Ward using geantino events
Alessandro Tricoli, RAL 10RAL ATLAS Physics, 18th March 2008
Off-Barrel Services (spread sheet) Services outside the Tracking Volume
Interlinks Cooling Capillaries and Spiders Thermal Enclosure (TE):ITE,OTE, Bulkhead, End-Panels Heat Spreader Plate (HSP) Heat Exchangers (HEX) including Heaters (“as built”, i.e. with dummy heaters) PPB1 Power Cables including Cable Trays
Example: Excel sheet for Inner TE (ITE)
Alessandro Tricoli, RAL 11RAL ATLAS Physics, 18th March 2008
Off-Barrel Services (pictures) B6 Bearing (with Interlinks are part of the barrel holding structure)
Thermal Enclosure (TE)
ITEOTESide Panels
End Panels
Heater Spreader Plate (HSP)
Cooling Spiders
HEX (green)
Alessandro Tricoli, RAL 12RAL ATLAS Physics, 18th March 2008
Off-Barrel Services (masses & X0) Off-Barrel
ServicesInterlinks Cooling
PipesTE HSP HEX PPB1 Cables
& TraysTOT
Mass (Kg) 2.64 2.30 30.47 49.15 49.89 60.09 197.15 391.69
Off-Barrel Services (Components Breakdown)
0
0.05
0.1
0.15
0.2
0.25
Cable Trays
PPB1
HEX Assembly
HSP
TE
Interlinks+Spiders&Capillaries
Includes all materials that run through HSP (HEX excluded):Off-barrel opto-harness, cooling and N2 pipes, DCS wires
cables and cable trays are the largest single contribution
X0 Plots vs From Model:Simplified det. geometry(disks & barrels)
Alessandro Tricoli, RAL 13RAL ATLAS Physics, 18th March 2008
Off-Barrel Services (X0 plots in G4)
Smeared vertexComponent-by-component
Smeared vertexStacked components
By Pat Ward using geantino
Alessandro Tricoli, RAL 14RAL ATLAS Physics, 18th March 2008
Modules, On-barrel and Off-Barrel Services
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0
0.2
0.4
0.6
0.8 1
1.2
1.4
1.6
1.8 2
2.2
2.4
2.6
2.8 3
3.2
3.4
Modules
Off-Barrel Services
On-barrel Services
Mass and Radiation Length
Modules, On-barrel and Off-Barrel Services (component breakdown)
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45Cable Trays
PPB1
HEX Assembly
HSP
TE
Interlinks+Spiders&CapillariesModules
Harness & Doglegs &EndClampsBrackets
Cooling
Cylinders
Mass of on-barrel services 20% higher than previous estimates Mass of off-barrel services 50% higher than previous estimates
X0 calculated analytically assuming simplified geometries In agreement with Pat’s plot, using geantino events
For ||<0.5 on-barrel services and modules dominate modules are the largest single contribution
For 0.5< ||< 1.9 off-barrel services dominate cables and cable trays are the largest single contribution
G4
SimplifiedModel Simplified
Model
Alessandro Tricoli, RAL 15RAL ATLAS Physics, 18th March 2008
ComparisonBottom-up vs Top-down estimates…
Top-down: measurements after installation SCT Barrel not weighed, can only be inferred:
TRT weighed and ID barrel ID Barrel (weighed) = SCT + TRT + Extra Temporary Bits (Trolley+…) SCT weight inferred from: ID Barrel – TRT – Extra Temp. Bits
Bottom-up: sum up masses of Modules, On-Barrel Services and some Off-Barrel services to be consistent with the measured object
Alessandro Tricoli, RAL 16RAL ATLAS Physics, 18th March 2008
Measured Assembly Mass (Kg) QTY in ATLAS Tot Mass (kg) Comments
Total SCT+TRT+trolley 1880.10 1 1880.10TRT (average) 718.35 1 718.35SUB-TOT 1161.75
Barrel Trolley (after installation) 704.39 1 704.39Metarial removed after weighing 15.20 1 15.20SCT z-lock and clamps 5.88 1 5.88
ESD clingfilm- C side 0.262 1 0.26ESD clingfilm- A side 0.231 1 0.23ISSS covers 15.274 1 15.27ISSS bars 4.892 1 4.89ESD foam & ESD bags 6.454 1 6.45Perforated shelves (Al?) & wires 18.902 1 18.90Perforated end panels (Al?) & wires 1.789 1 1.79End panel covers (Al) 4.145 1 4.15Inner support rings (Al) 5.392 1 5.39Random screws etc. 50% SS, 50% plastic 1.012 1 1.0196 FSI long spools (98% Al, 2% plastic) 12.36672 1 12.3748 FSI round spools (100% plastic) 1.9536 1 1.95Plastic gas pipes 0.405 1 0.41Central ISSS plus perforated parts (Al) 36.047 2 72.09Upper & lower support beams (steel) 48 2 96.00Various aluminium screws and fixtures 2.109 2 4.22Various steel screws and fixtures 3.458 2 6.92SUB-TOT 977.78
TOT EXPERIMENTAL MEASUREMENT 183.97
Measured Components
Material Removed after SCT+TRT+Trolley Measurement
Extra Material Removed after SCT+TRT+Trolley Measurement
29-Aug-06 Neil/Heinz: load cells corrected for Al cylinder and Al blocks29-Aug-06 Heinz et al.: summary of list for material removed after weight check and before installation
25-Aug-06 Heinz: z-lock removed but cross bars still installed
8 Feb 2006 Neil: measured with load cells after on-detector SCT and TRT work was finished in SR1727 Kg and 709.7 Kg, each with an uncertainty of ~20 kg: including active gas manifold, cooling manifolds.
From R. ApsimonFrom R. ApsimonFrom R. Apsimon
From R. Apsimon
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From R. ApsimonFrom R. ApsimonFrom R. Apsimon
From R. ApsimonFrom R. ApsimonFrom R. ApsimonFrom R. Apsimon
From R. Apsimon
From R. Apsimon
From R. Apsimon
Top-down estimate
SCT = (SCT+TRT+Extra Bits) – TRT – Extra Bits (Trolley, ISSS etc.)
SCT= 175 (727Kg TRT) , 184 (av. 718Kg TRT) , 193 (709Kg TRT) Kg
M. Goulette (ATL-COM-INDET-2006-006) Poor Accuracy due to TRT weight measurements (~20 Kg): 727 Kg [=714 (measured) – 0.5 (St. St Manifold) + 8 (active gas manifold) +5.6 (cooling manifold) ]
709 Kg [=699.5 (measured) + 6 (active gas manifold) +4.2 (cooling manifold) ] Bottom-up estimate 691 Kg [=702.9 – 11.9 (cooling fluid)] by M. Goulette et al.
Alessandro Tricoli, RAL 17RAL ATLAS Physics, 18th March 2008
Comparison with Bottom-up estimate
Trying to be consistent with measurement (very difficult!!): SCT= Modules + B(3,4,5,6) services – Cooling Fluid + Capillaries&Spiders + Interlinks + TE SCT-Pixel Attachment & on-barrel FSI missing (light anyway)
SCT = 186 KgBottom-Up:
+11 (727Kg TRT), +2 (av. 718Kg TRT), -7 (709Kg TRT) KgBottom-Up - Top-Down Difference:
Barrel SCT Components Mass (g) QTY in ATLAS Tot Mass (g)
Modules 24.74 2112 52255.10B3 : 13964.18 1 13964.18
B4 17794.23 1 17794.23
B5 21580.54 1 21580.54
B6 25101.48 1 25101.48
Remove C3F8 from Barrels -2708.11SUB-TOT 127987.43
Barrel Capillaries & Spiders 1150.75 2 2301.50
SCT-Pixel Attachments
FSI
Interlinks+B6 Bearing 1322.23 2 2644.46
Thermal Enclosure 30474.75 1 30474.75
Off-Barrel Opt-Harness fraction 10213.38 2 20426.76
Off-Barrel DCS wire fraction 382.26 2 764.52
Off-Barrel Capillary fraction 32.14 2 64.28
N2 pipes 883.26 2 1766.52extra glue
SUB-TOT 58442.79TOT BOTTOM-UP ESTIMATE 186430.22
including: Support Cylinder with flanges, Cooling Loops, Cooling Blocks, Cooling Inlets and Outlets, Brackets, Harnesses and Doglegs, End Clamps (No FSI yet)
including: Support Cylinder with flanges, Cooling Loops, Cooling Blocks, Cooling Inlets and Outlets, Brackets, Harnesses and Doglegs, End Clamps (No FSI yet)
including: Support Cylinder with flanges, Cooling Loops, Cooling Blocks, Cooling Inlets and Outlets, Brackets, Harnesses and Doglegs, End Clamps (No FSI yet)
Ask E. Perrin, Neal Hartman
From A. Nichols
HSP parts included in the ID barrel measurement:
From A. Nichols
including: a fraction of the Capillaries length, Spiders, Capillaries fittings and a fraction of DCS wires
including: Interlinks and B6 Bearing
including: Inner TE, Outer TE, End Panels, Bulkhead
added later (not included yet)
S. Gibson
Comments
From Taka KondoFrom A. Tricoli et al.
On-Barrel Components
including: Support Cylinder with flanges, Cooling Loops, Cooling Blocks, Cooling Inlets and Outlets, Brackets, Harnesses and Doglegs, End Clamps (No FSI yet)
Off-Barrel Components
From A. Tricoli et al.
From A. Nichols
From A. Tricoli et al.
missing
missing
From A. Tricoli et al.
From A. Tricoli et al.
From A. Tricoli et al.
From A. Tricoli et al.
From A. Tricoli et al.
From A. Tricoli et al.
Alessandro Tricoli, RAL 18RAL ATLAS Physics, 18th March 2008
Conclusions and Plans
Mass computation of SCT Barrel and close to completion in the volume within the cryostat wall
FSI to be added soon (only known bit missing)
Substantial increase in mass and X0 w.r.t. previous estimates/simulation (+20% on barrel services, +50% off-barrel services), especially at higher
due to more accurate computation of service contribution
Models implemented in GeoModel by Pat Ward. (available in Athena rel. 13)
Comparison between mass estimate and measurements: Limited accuracy due to large uncertainty on TRT weight measurement:
~20Kg Good Agreement within experimental accuracy
Documentation Complete web page with raw info, pictures, model destricptions, plots ATLAS Note write-up on going
Alessandro Tricoli, RAL 19RAL ATLAS Physics, 18th March 2008
EXTRAS
Alessandro Tricoli, RAL 20RAL ATLAS Physics, 18th March 2008
On-Barrel Services (X0 plots in G4)
Un-smeared vertex (0,0,0)Component-by-component
Un-smeared vertex (0,0,0)Stacked components
By Pat Ward using geantino events
Alessandro Tricoli, RAL 21RAL ATLAS Physics, 18th March 2008
Off-Barrel Services (X0 plots in G4)
Un-smeared vertex (0,0,0)Component-by-component
Un-smeared vertex (0,0,0)Stacked components
By Pat Ward using geantino
Alessandro Tricoli, RAL 22RAL ATLAS Physics, 18th March 2008
Inner Detector Volumes – from Grant, July 2006