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Vacuum Tube Material ( cylinder ) - just checking -

“Open Issues” (or not ?) on Geometry and Layout for CLIC_ILD 25 October 2010 Konrad Elsener, André Sailer (& Hubert Gerwig). Vacuum Tube Material ( cylinder ) - just checking -. Material: Beryllium Thickness: given by vac. engineer (R. Veness) as t [mm] = 0.01 x F [mm]

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Vacuum Tube Material ( cylinder ) - just checking -

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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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