barrel sct material budget by alessandro tricoli ral atlas physics meeting, 18 th march 2008

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)


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


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


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


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


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


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)




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)


On-Barrel Services (X0 plots in G4)

Smeared vertexComponent-by-component

Smeared vertexStacked components

By Pat Ward using geantino events


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)


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)


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)


Off-Barrel Services (X0 plots in G4)

Smeared vertexComponent-by-component

Smeared vertexStacked components

By Pat Ward using geantino


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


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


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



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.


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)



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


Off-Barrel Components

From A. Tricoli et al.

From A. Nichols


missing

missing








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


EXTRAS


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


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


Inner Detector Volumes – from Grant, July 2006

barrel sct material budget by alessandro tricoli ral atlas physics meeting, 18 th march 2008

Documents

barrel layers

barrel services comparison

barrel services radial

barrel services link

barrel sct links

budget barrel section

stephen haywood barrel

mass estimate