1. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education1 SCT Geometry Optimization Ryuichi Takashima Kyoto Univ. of Education Representing a Si-soft group in Japan: –Okayama University Reisaburo Tanaka, Youji Tomeda –KEK Youhei Morita, Taka Kondo –Kyoto university of Education Ryuichi Takashima, Tomoki Kawachi –University of Tsukuba Kazuhiko Hara, Kensuke Emoto

2. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education2 Status of G4/goofy SCT simulation All G3/NOVA geometries were installed for barrel SCT part. The rapidity dependence of radiation thickness is well reproduced (reported on Mar. 4, 2003). Working toward more realistic geometries and materials.First goal is to make the “Fine Geometry”.

3. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education3 Structure of Simulation Programs Present Geant4/goofy simulationGEANT3/NOVA simulation

4. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education4 “ Fine Geometry “ “ Fine Geometry “ Engineering Drawings Geant4 Fine Geometry Geant4 Coarse Geometry Volume & Material excel tables Using Geant4 FADS/goofy Web page for this work can be seen at http://atlas.kek.jp/si-soft/geometry.html We are here

5. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education5 Naming of Volumes for SCT Barrel Module (examples) SCTBBottomChip1,----,6 SCTBBottomCarbobCarbon SCTBTopChip1,----,6 SCTBTopPitchAdaptor SCTBTopCopperPolyimide SCTBTopSensorPair SCTBHybridConnector SCTBBaseboard1,2,3,4,5 SCTBTopCoolendFacing SCTBBottomSensorPair - Attach header SCTB for all volumes. - As close as hardware names. - Easy to guess the objects. Naming rules

6. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education6 Specifications of the Volumes (examples) Volume name lengthposition angle den- sity Material name xyzxyz mm degreeg/cm 2 SCTBTopSensorPair 128.0 5 63.560.28 5 00 0.4325 1.14592.328Si SCTBBottomSensorPair 128.0 5 63.560.28 5 00 0.4325 -1.14592.328Si SCTBBaseboard153.5068.500.58 0 11.25 0 - 15.25 001.595SCTBBaseboardMaterial SCTBTopCoolendFacing60.0016.670.25 0 14.50 0 - 41.16 0.33503.002SCTBCoolendFacingMater ial SCTBTopFarsideCCStep21.004.0000.58 0 16.20 4 35.08 3 0.7501.14591.82SCTBCarbonCArbonBridg eMaterial SCTBTopCarbobCarbon21.0074.600.37 0 15.49 8 0.210- 1.125 -1.14591.81 SCTBBottomCopperPolyimi de 21.0074.600.27 9 15.49 8 0.210-1.55-1.14591.93SCTBCopperPolyimideMat erial SCTBBottomChip28.4006.5500.60 0 13.00 6 - 15.36 - 1.989 -1.14592.46SCTBAsicMaterail SCTBTopPitchAdaptor2.70063.000.25 0 6.350- 0.027 1.8141.14592.71SCTBPitchAdaptorMaterail SCTBHybridConnector25.403.0505.00 0 14.07 6 0.2101.6891.14591.38SCTBHybridConnector Materal These values are taken from the final drawings for production. The positions refer to the center of the SCT barrel module.

7. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education7 Drawings for Volume Definition (examples)

8. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education8 Calculation of Material Composition (examples) Material Components Carbon-Carbon: (weight=1.786 g) Carbon 100%,  = 1.90 g/cm 3 Parylene-C: (weight=0.081 g) C 8 H 7 Cl,  = 1.298 g/cm 3 Conductive Adhesive: (weight=0.033 g) Epoxy 29 W%, Silver 71 W% Thermal Adhesive: (weight=0.198 g) Epoxy 69.25 W%, Boron Nitride 30.25W% Composition of “SCTBCarbonCarbonbridgeMaterial “ MaterialweightHBCNOClAg Carbon-Carbon1.789 1.0 Parylene-C0.081 0.0510.6930.256 Conductive adhesive0.033 0.0210.2200.0490.710 Thermal adhesive 0.1980.0490.1340.5260.1740.117 TOTAL2.098 0.00690.012 6 0.93130.016 4 0.01.1 8 0.00980.011 1

9. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education9 Programming examples 1 SCTBGeometryManager.hh double SCTBGeometryManager::CarbonbridgeThickness() const { return 0.37*mm; } double SCTBGeometryManager::CarbonbridgeWidth() const { return 74.6*mm; } double SCTBGeometryManager::CarbonbridgeLength() const { return 21*mm; }

10. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education10 Programming examples 2 material.xml

11. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education11 Some results on radiation length Radiation length, module only Radiation length, sensor only Nova parametersFine parameters (this work) 

12. ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education12 Summary “ Fine Geometry” work is proceeding in Japan in order to reflect the true/final geometries and materials in the Geant4 simulations. We have successfully developed a method just for the case of barrel SCT module. The volumes and materials are named optimal for the Geant4 description. Please give us your comments/suggestions. See the working page for more details: http://atlas.kek.jp/si-soft/geometry.html