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Geometry and Layout Open Issues for CLIC ILD

Discussion on vacuum tube material, vertex detector radius, vacuum tube conical part, BeamCal position, and Muon System Configuration for CLIC ILD. Includes proposed changes and resolutions on various geometry factors.

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Geometry and Layout Open Issues for CLIC ILD

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  1. “Open Issues” (or not ?)on Geometry and Layoutfor CLIC_ILD25 October 2010Konrad Elsener, André Sailer (& Hubert Gerwig)

  2. Vacuum Tube Material (cylinder) - just checking - Material: Beryllium Thickness: given by vac. engineer (R. Veness) as t [mm] = 0.01 x F [mm] QUESTION: is this agreed ? (w/o coating etc. ?)

  3. Vertex Detector Radius - news from IWLC - talk by A. Sailer factor 2 in direct hits: from 31 mm -> 37 mm factor 2 in total hits: from 31 mm -> 38 mm => Within errors, this is the same !

  4. Vertex Detector Radius NB. ILC_ILD vertex hits: 0.02 hits mm-2 BX-1 ILC_SiD vertex hits: CLIC_ILD vertex hits: 0.02 hit mm-2 ns-1 QUESTION: any need for a change ? factor 2 in direct hits: from 31 mm -> 37 mm factor 2 in total hits: from 31 mm -> 38 mm => within errors, this is the same !

  5. Vacuum Tube Material (conical part) conical part: steeltungsten (in the model) (= thicker steel tube) radiation length Fe: 17.6 mm, W: 3.5 mm for “old” steel t = 1.2 mm -> “new” steel t = 6 mm

  6. Vacuum Tube Material (conical part) NOTE: azimuthal asymmetry of hits in vertex is entirely due to backscattered particles – removing backscatterers therefore important !! Proposal: change conical part to > 6 mm steel ? or 1-2 mm of steel with tungsten layer outside ? (background reduction in the vertex detector as the driving parameter) (NB. “pointing geometry”, cone points to the IP)

  7. BeamCal Position (in z) the issue: BPM and kicker must be close to the IP QUESTION: is it agreed that BeamCal will be placed near LumiCal ?

  8. LumiCal outer radius Double vacuumisolation valves BPM and Kickernearby (timing) Inner support tube QD0 Anti solenoid Outer Support Tube Valve must pass when LumiCal is open ! Alain Hervé, IWLC2010 Workshop, 22 October 2010

  9. LumiCal outer radius 330 mm instead of 350 mm o.k. B. Pawlik (FCAL) BUT: Space for the electronics included in the 330 mm ? Proposal: do not change simulation model beyond Router=300 mm

  10. ECAL “plug” check with Hubert ... Proposal: do not change simulation model

  11. HCAL “ring” all o.k. (do not change simulation model)

  12. “Yoke Endcap Nose (Plug)” check with Hubert ... Proposal: do not change simulation model

  13. Muon System Configuration Yoke instrumentation: barrel - 3 x 3 layers (out of 18 layers in the model – 3+3+3+3+3+3); N.B.: first layer immediately after the vacuum tank (no steel layer); end-cap – 3 x 3 layers (cf. barrel) + 1 layer in the “yoke plug” Proposal: adopt this model “as is”

  14. CLIC_SiD matters (from Lucie, with comments from Christian) ** Beam pipe => idem(currently in CLIC_SiD: cylindrical part 0.5 mm Be, conical part 1 mm Fe (in R)** Muon system => idem(barrel: first double RPC layer - 40 mm gap size; rest of barrel -> Christian) (Yoke plug: 150 mm Fe+ 40 mm RPC + 90 mm Fe (+100mm Fe in end-cap) ** HCAL ring => (not existing in CLIC_SiD, not needed (?))** ECAL plug, Lumical radius, Beamcal position (comment: instead of 10 cm graphite, SiD uses 10 cm Borated Polyethylenes) ** Active material in HCAL => analog scintillator** Intrinsic resolution of the vertex detector => 3 micron proposed by Harry Weerts, Marcel Demarteau and Jan Strube on Saturday (NOTE: vertex resolution (as any other tracking resolution) is chosen during digitization in virtual segmentation, not part of geometry definition «proper»)

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