ATLAS Software week, 13 May 2003 Ryuichi Takashima Kyoto Univ. of Education 1

SCT Geometry Optimization

Ryuichi TakashimaKyoto 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

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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”.

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Structure of Simulation Programs

Present Geant4/goofy simulation GEANT3/NOVA simulation

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“ “ 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 athttp://atlas.kek.jp/si-soft/geometry.html

We are here

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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

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Specifications of the Volumes (examples)

Volume name

length position

angle

den-sity Material namex y z x y z

mm mm mm mm mm mm degree g/cm2

SCTBTopSensorPair 128.05

63.56

0.285

0 0 0.4325 1.1459 2.328 Si

SCTBBottomSensorPair 128.05

63.56

0.285

0 0 0.4325 -1.1459 2.328 Si

SCTBBaseboard1 53.50 68.50

0.580

11.250

-15.25

0 0 1.595

SCTBBaseboardMaterial

SCTBTopCoolendFacing 60.00 16.67

0.250

14.500

-41.16

0.335 0 3.002

SCTBCoolendFacingMaterial

SCTBTopFarsideCCStep 21.00 4.000

0.580

16.204

35.083

0.750 1.1459 1.82 SCTBCarbonCArbonBridgeMaterial

SCTBTopCarbobCarbon 21.00 74.60

0.370

15.498

0.210 -1.125

-1.1459 1.81

SCTBBottomCopperPolyimide

21.00 74.60

0.279

15.498

0.210 -1.55 -1.1459 1.93 SCTBCopperPolyimideMaterial

SCTBBottomChip2 8.400 6.550

0.600

13.006

-15.36

-1.989

-1.1459 2.46 SCTBAsicMaterail

SCTBTopPitchAdaptor 2.700 63.00

0.250

6.350 -0.027

1.814 1.1459 2.71 SCTBPitchAdaptorMaterail

SCTBHybridConnector 25.40 3.050

5.000

14.076

0.210 1.689 1.1459 1.38 SCTBHybridConnector Materal

These values are taken from the final drawings for production.

The positions refer to the center of the SCT barrel module.

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Drawings for Volume Definition (examples)

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Calculation of Material Composition (examples)

Material ComponentsCarbon-Carbon: (weight=1.786 g) Carbon 100%, = 1.90 g/cm3

Parylene-C: (weight=0.081 g) C8H7Cl, = 1.298 g/cm3 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 “

Material weight H B C N O Cl Ag

Carbon-Carbon 1.789 1.0

Parylene-C 0.081 0.051 0.693 0.256

Conductive adhesive 0.033 0.021 0.220 0.049 0.710

Thermal adhesive 0.198 0.049 0.134 0.526 0.174 0.117

TOTAL 2.098 0.0069 0.0126

0.9313 0.0164

0.01.18

0.0098 0.0111

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Programming examples 1SCTBGeometryManager.hh

double SCTBGeometryManager::CarbonbridgeThickness() const

{ return 0.37*mm;}double SCTBGeometryManager::CarbonbridgeWidth() const{ return 74.6*mm;}double SCTBGeometryManager::CarbonbridgeLength()

const{ return 21*mm;}

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Programming examples 2material.xml

<composite name="SCTBCarbonCarbonbridgeMaterial" density="1.81">

<addmaterial material="Hydrogen"> <fractionmass fraction="0.0069"/>

</addmaterial> <addmaterial material="Boron"> <fractionmass

fraction="0.0126"/> </addmaterial> <addmaterial material="Carbon"> <fractionmass

fraction="0.9314"/> </addmaterial> <addmaterial material="Nitrogen"> <fractionmass

fraction="0.0164"/> </addmaterial> <addmaterial material="Oxygen"> <fractionmass

fraction="0.0118"/> </addmaterial> <addmaterial material="Chlorine"> <fractionmass

fraction="0.0098"/> </addmaterial> <addmaterial material="Silver"> <fractionmass

fraction="0.0111"/> </addmaterial> </composite>

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Some results on radiation length

Radiation length, module only Radiation length, sensor only

Nova parameters Fine parameters (this work)

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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