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SCT Material

SCT Material. Stephen Haywood Rutherford Appleton Lab. Apologies. I was asked to coordinate SCT X 0 effort. RAL well placed Some of the key engineers for Barrel & End-cap Experience of Barrel & Disc Services Assembly

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SCT Material

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  1. SCT Material Stephen Haywood Rutherford Appleton Lab

  2. Apologies • I was asked to coordinate SCT X0 effort. • RAL well placed • Some of the key engineers for Barrel & End-cap • Experience of Barrel & Disc Services Assembly • Design of much of the “off-detector” services up to PPF1 & TEs With the departure of Debbie Greenfield, I have been consumed with EC Engineering at RAL. The amount of work to do has been much more than expected and subsequent problems have caused this to go slowly. Engineers have been too busy designing/producing/assembling hardware to have time to supply all info. Lot of effort gone into chasing people. My slow progress has caused others to take the initiative and do some of the work – with a possible loss of coherence. • I have struggled to keep my eye on the ball. SCT Material 2

  3. Aims • In the Physics TDR, I proposed that satisfactory understanding of electrons (in particular cross-calibration of ID and ECal through E/p) requires a “local” understanding of X0 at the level of O(1)% of its value. • Lot of discussion about this: • It is tough to reach this precision. • Not trivial to do from data (conversions, electron fits). • Consistency of mass measurements with Discs gives encouragement that O(1)% is achievable. • But need to have a good understanding of material compositions and corresponding X0s. • So O(1)% provides a target – unless we try, we won’t achieve and run the risk of being far from a satisfactory level. SCT Material 3

  4. Plan • The Plan was/is: • Gather Info in a coherent form: • 20 months ago, info was requested from a list of Responsibles. • Request Word Pro-Forma to be completed, supplemented by speadsheets. • Process that Info to create a “paper description” or Model: • Perform averaging of masses of different components. • Identify suitable Volumes for Simulation: size, location, mass. • Identify material composition within each Volume. • S/w people (was Grant Gorfine, now Pat Ward) incorporate Volumes into S/w description, ie. G4/GeoModel. • Check what is in Simulation with measured masses. SCT Material 4

  5. Philosophy • This is a long-term, detailed and methodical approach intended to get an accurate and complete description of the material in the Simulation. • It would be relatively easy to produce spreadsheets which gave the average X0 in the centre of the Barrel – this is not our aim. We need to cope with all the complications and irregularities as a function of (h,f). • (The problem is very complicated and I believe not solved by trivial spreadsheets … only capturing the info in the Simulation will give us a satisfactory description of X0.) • So this approach does not lead instantly to plots of X0. Meaningful plots will only be available once sufficient info has been incorporated into the Simulation code. SCT Material 5

  6. Info at: http://hepwww.rl.ac.uk/atlas-sct/engineering/material_budget/ SCT Material 6

  7. Status file – shows interaction with Responsibles. Green – I have info Yellow – info being collected or available; not yet received by me Red – info not gathered Info Gathering SCT Material 7

  8. Achievements • Barrel Modules – GeoModel description by Daisuke Naito et al • End-cap Modules – GeoModel description by Peter Kodys • Barrel Services – description being developed by Taka Kondo et al • Disc Services – model constructed by Haywood and GeoModel description coded by Gorfine SCT Material 8

  9. Summary SCT Material 9

  10. Future • Pat Ward has taken over from Grant Gorfine and is now actively creating new GeoModel entities: finishing off On-Disc Services. • To move things forward at RAL, Alessandro Tricoli (new RA) is working with Taka Kondo to complete the On-Barrel Services. • I will not have significant free time until mid-Jul (?), then: • Revisit collection of Info, esp masses – chase people (once more) ! • Complete Model for End-cap On-Cylinder Services. • Do everything else ! • There is a lot to do and many of the key people are very busy ! SCT Material 10

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