SCT EC Material Stephen Haywood Rutherford Appleton Lab

Jan 2008 SCT Material 2 Stephen Haywood Introduction General End-cap End-cap contributions from: Paul Bell, Jason Tarrant, Ian Wilmut and Brian Anderson, Jeff Bizzell, Richard Brenner, Tim Brodbeck, Pawel Bruckman, Janet Carter, Colin Dabinett, Katharine Dickinson, Peter Ford, Martin Gibson, Harry Gulliver, Nigel Hessey, John Morris, Koichi Nagai, John Noviss, Val O’Shea, Luis Sospedra, Tony Weidberg, Patrick Werneke Barrel:Alessandro Tricoli GeoModel: Pat Ward, Grant Gorfine, Moustapha Thioye

Jan 2008 SCT Material 3 Stephen Haywood Guiding Principles TDR: To x-calibrate Ecal and InDet, look at E/p; need to understand X 0 at O(2)% of its value. Specify volumes by mass and effective radiation length × density. Sometimes G4 volumes need to be shifted to avoid clashes and allow them to be “alignable”. Try to identify every component Look for objects ≥ 1cm 3 or 1 g Material is more important at lower radius – and easier to determine Try to retain reasonable spatial precision, but small objects or those at large radii smeared Shape is not important (for objects << 1 X 0 ). Composition is important – factor of 3 variation in  X 0. Location of transverse radius important at O(1)% level.

Jan 2008 SCT Material 4 Stephen Haywood Web Note Summary Info Summary Plots – Pat Ward

Jan 2008 SCT Material 5 Stephen Haywood Methodology Observed sub-detectors being constructed Weighed sets of components where possible – very complicated spreadsheets, documents & many drawings E.g. Disk spreadsheet: 10 sheets, some 100 r × 15 c Extracted masses from CAD Did not have as much time as would have liked. Raw Info (Eng)  “Model” (AT & SH)  G4 Geom Description (PW) Attempt to weigh SCT in TRT – inconsistent, so ignored. “Workshop”: 1. Alessandro & Stephen check Pat has correctly implemented Model 2. Alessandro & Stephen explain Model to RAL Engineers

Jan 2008 SCT Material 6 Stephen Haywood End-cap 6 Regions: 1. Modules – done by Peter Kodys 2. Disks & Services 3. Support Cylinder & Services 4. Support Structures (ITE & Front/Rear Supports) 5. External Radial Services 6. External Cryostat Services & PPF1 Surprises: ITE glue: estimate 0.5 kg, measure 1.2 kg; ITE Assy weighs 6.3 kg RTE glue: estimate 70 g, measure 510 kg; Pad weighs 1.2 kg OTE glue: OTE-A weighs 2.1 kg, OTE-C weighs 3.2 kg  Araldite on Airex hard to control

Jan 2008 SCT Material 7 Stephen Haywood End-cap Mass ComponentMass (kg) Modules24 Disks & Services33 Support Cylinder, Services & OTE57 Other Support Structures (ITE, Front & Rear Supports)23 External Radial Services, including STFT & RCT41 External Cryostat Services, including CCT’s47 PPF1’s35 Total259

Jan 2008 SCT Material 8 Stephen Haywood Checks Some comparisons between measurements & CAD estimates Discuss with Engineers Check spreadsheets on separate occasions – small mistakes found Consistency checks ComponentEstimate (g)Measure (g)Diff (%)Comment RCT Spacers79747Fittings added? RCT Complex Assy PPF1 Mounting plate Simple metalwork Monophase Cooling Complex pipework with connectors Disk3390 (from components) Scale Model to give measured mass

Jan 2008 SCT Material 9 Stephen Haywood PPF0 in VP1 … thanks Bill

Jan 2008 SCT Material 10 Stephen Haywood Model vs G4 Geom Description Integrals agree to 0.5% X 0 vs  Not totally trivial to extract X 0 from Model – see next

Jan 2008 SCT Material 11 Stephen Haywood

Jan 2008 SCT Material 12 Stephen Haywood Differences between association of volumes. X 0 not directly proportional to Mass due to Composition Solid angle X 0 integrals

Jan 2008 SCT Material 13 Stephen Haywood Difference between EC-A & EC-C ComponentEC-A (kg)EC-C (kg)Half-Diff (%)Comment Support Cylinder  3 OTE adhesive  26 Poor quality Airex for EC-C ITE  3 Different adhesive coverage LMT Cooling Clamp ?? Sum

Jan 2008 SCT Material 14 Stephen Haywood Uncertainties Sealant: 400 g estimated for STFT; could be wrong by factor of 2-3 Coolant: Vapour fractions uncertain; total estimate 6 kg Omissions: Some identified recently; too small to be worth effort to change Hard to estimate numbers. So guess: In Tracking Volume: <5 kg on 140 kg, i.e. <4% Total EC (including PPF1): <10 kg on 260 kg, i.e. <4%

Jan 2008 SCT Material 15 Stephen Haywood Model

Jan 2008 SCT Material 16 Stephen Haywood

Jan 2008 SCT Material 17 Stephen Haywood 6 spreadsheets ~10 Sheets 1-3 Volumes/sheet Mass Composition Numbers Dimensions Location

Jan 2008 SCT Material 18 Stephen Haywood Pat’s Plots

Jan 2008 SCT Material 19 Stephen Haywood Modules / Disks / Cylinder Services/ Ext Services

Jan 2008 SCT Material 20 Stephen Haywood Fixed Vtx / Smeared Vtx /  Scan / z Scan

Jan 2008 SCT Material 21 Stephen Haywood Modules / Cylinder Services

Jan 2008 SCT Material 22 Stephen Haywood CSC-03 vs TDR It’s got worse ! Difficult/tedious to understand changes. It is what it is. Only issue is for future: what tends to get underestimated?

Jan 2008 SCT Material 23 Stephen Haywood Conclusions Believe Model is a good description of reality G4 Geom Description is a faithful representation of the Model Description good to a few percent All effort in vain if Pixels have not done at least as good a job We have not looked at SCT (B+EC) Services beyond PPF1