1. Barrel SCT Material Budget By Alessandro Tricoli RAL ATLAS Physics meeting, 18 th March 2008

2. Alessandro Tricoli, RAL2 RAL ATLAS Physics, 18 th 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)

3. Alessandro Tricoli, RAL3 RAL ATLAS Physics, 18 th 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 Bearing HSP

4. Alessandro Tricoli, RAL4 RAL ATLAS Physics, 18 th 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

5. Alessandro Tricoli, RAL5 RAL ATLAS Physics, 18 th 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)  X 0 plots from Model:  using simplified geometries  X 0 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

6. Alessandro Tricoli, RAL6 RAL ATLAS Physics, 18 th March 2008 On-Barrel Services Bottom-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

7. Alessandro Tricoli, RAL7 RAL ATLAS Physics, 18 th March 2008 On-Barrel Services (pictures) B3 Module Dogleg Cooling Block Cooling Inlet Cooling Outlet (manifold) Cooling pipe Optical FibresDoglegLMTs Harness (LMTs, Dogleg, Fibers) Bracket Cylinder

8. Alessandro Tricoli, RAL8 RAL ATLAS Physics, 18 th March 2008 On-Barrel Services (masses) On-Barrel Services B3B4B5B6TOT Mass (Kg)13.9617.7921.5825.1078.44 Taka Kondo Module Mass:  24.74 g Average module’s mass  52.26 Kg Total mass for the whole barrel SCT. 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   X 0 Plots vs  From Model: Simplified det. geometry (disks & barrels)

9. Alessandro Tricoli, RAL9 RAL ATLAS Physics, 18 th March 2008 On-Barrel Services (X 0 plots in G4) Smeared vertex Component-by-component Smeared vertex Stacked components By Pat Ward using geantino events

10. Alessandro Tricoli, RAL10 RAL ATLAS Physics, 18 th 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)

11. Alessandro Tricoli, RAL11 RAL ATLAS Physics, 18 th March 2008 Off-Barrel Services (pictures) B6 Bearing (with Interlinks are part of the barrel holding structure) Thermal Enclosure (TE) ITE OTE Side Panels End Panels Heater Spreader Plate (HSP) Cooling Spiders HEX (green)

12. Alessandro Tricoli, RAL12 RAL ATLAS Physics, 18 th March 2008 Off-Barrel Services (masses & X 0 ) Off-Barrel Services InterlinksCooling Pipes TEHSPHEXPPB1Cables & Trays TOT Mass (Kg)2.642.3030.4749.1549.8960.09197.15391.69 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 X 0 Plots vs  From Model: Simplified det. geometry (disks & barrels)

13. Alessandro Tricoli, RAL13 RAL ATLAS Physics, 18 th March 2008 Off-Barrel Services (X 0 plots in G4) Smeared vertex Component-by-component Smeared vertex Stacked components By Pat Ward using geantino

14. Alessandro Tricoli, RAL14 RAL ATLAS Physics, 18 th March 2008 Mass and Radiation Length  Mass of on-barrel services 20% higher than previous estimates  Mass of off-barrel services 50% higher than previous estimates  X 0 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 Simplified Model Simplified Model

15. Alessandro Tricoli, RAL15 RAL ATLAS Physics, 18 th March 2008 Comparison Bottom-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

16. Alessandro Tricoli, RAL16 RAL ATLAS Physics, 18 th March 2008 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.

17. Alessandro Tricoli, RAL17 RAL ATLAS Physics, 18 th 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 Kg Bottom-Up: +11 (727Kg TRT), +2 (av. 718Kg TRT), -7 (709Kg TRT) Kg Bottom-Up - Top-Down Difference:

18. Alessandro Tricoli, RAL18 RAL ATLAS Physics, 18 th 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 X 0 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

19. Alessandro Tricoli, RAL19 RAL ATLAS Physics, 18 th March 2008 EXTRAS

20. Alessandro Tricoli, RAL20 RAL ATLAS Physics, 18 th March 2008 On-Barrel Services (X 0 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

21. Alessandro Tricoli, RAL21 RAL ATLAS Physics, 18 th March 2008 Off-Barrel Services (X 0 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

22. Alessandro Tricoli, RAL22 RAL ATLAS Physics, 18 th March 2008 Inner Detector Volumes – from Grant, July 2006