Feb. 10, 2005 1

Daisuke Naito, Okayama University in collaboration with Japanese si-soft group

R. Tanaka, D. Naito (Okayama U.),R.Takashima (Kyoto U. of Education),

T. Kondo (KEK),K. Hara, K. Nakamura, Y. Nakamura (Tsukuba U.)

I. Ueda (ICEPP, U. of Tokyo)and

helped by G. Gorfine (NKHEF)

ATLAS Barrel SCT ATLAS Barrel SCT geometry update plangeometry update plan

Feb. 10, 2005 2

Status of barrel SCT simulation

• Geant3 simulation with NOVA parameters

• Geant4 simulation using G3-Nova parameters well reproduced G3 results.

• GeoModel version for DC2 with slight parameter changes.

• Working to update geometries:Drawings Detail geometry Simple geometry DC3

Feb. 10, 2005 3

　　 Update planUpdate planEngineering

Drawings

GeoModel Detail Geometry

GeoModel Simple Geometry

for DC3 (hopefully)

Volume & Material excel

tables

Using GeoModel for Geant4

Web page for this work:http://atlas.kek.jp/si-soft/geometry.html

we are here

Feb. 10, 2005 4

Detail geometry (examples)

Feb. 10, 2005 5

Detail geometry

to

Simple geometrySCT_BB1, BB2, BB3, BB4, BB5

SCT_DetailHybrid

SCT_CoolendFacing

SCT_Sensor

SCT_FarendFacingDetail

SCT_Connector

SCT_ABCDchip

SCT_PicthAdaptor

SCT_Pigtail

SCT_HybridInterConnect

SCT_CarbonBridge

SCT_CarbonStep

SCT_HybridSimple

SCT_SensorSimple SCT_BaseBoardSimpleSCT_PigtailSimple

Feb. 10, 2005 6

SCT Detail Module geometry using GeoModel

• SCT Module geometry is made up of 16 elements.• A passive volume inherits a class named

SCT_ShardComponent.• A sensitive volume inherits a class named

SCT_UniqueComponent.

Feb. 10, 2005 7

Structure of the detail geometry

• This geometry is divided into 3 components.• SCT_InnerSide and SCT_OuterSide inherit SCT_UniqueComponen

t.• SCT_DetailBaseBoard inherits SCT_SharedComponet.

Feb. 10, 2005 8

Structure of the detail geometry(2)

• A class named SCT_OuterSide group the elements like Sensor, ABCDChip, e.t.c…This class is defined complex shape that is made of air.

• These complex shape is made by boolean volume.• The boolean volume makes a complex shape with subtracting a b

ox or a tube or adding a box or a tube.• SCT_InnerSide is made by the same way.

Feb. 10, 2005 9

Structure of the detail geometry(3)

• SCT_DetailBaseBoard includes elements named SCT_FarendFacing and SCT_CoolendFacing.

• SCT_DetailBaseBoard is made up of 5 elements.

Feb. 10, 2005 10

Dimensions and Coordinates• We gave all dimensions and coordinates names.• We calculate those coordinates with minimum geometry

information.• We avoid that code has magic numbers.

Feb. 10, 2005 11

Dimensions and Coordinates(2)• For example, an coordinate of an element named bb2

that makes up SCT_DetailBaseBoard is calculated follows: bb2PosZ = bb1PosZ + 0.5*l_bb1 + 0.5*l_bb2, where l_bb1 is length of bb1, l_bb2 is length of bb2.

Feb. 10, 2005 12

Some Results of Detail Simulation (1) :

weight

weight of detail module 24.28 g

weight of real modules 24.77 g

difference -2.0 %

Use Hepvis Event Viewer

Module No. Weight [g]

23 24.54

25 24.51

40 24.78

372 24.59

469 24.67

485 24.90

497 24.76

522 24.90

579 24.84

580 24.91

581 24.71

583 24.83

917 24.98

958 24.88

average 24.77

KEK measured the weight of the actual 14 SCT modules

Feb. 10, 2005 13

Some Results of Detail Simulation (2) :

radiation length

Feb. 10, 2005 14

Verification of the module position

Feb. 10, 2005 15

Summary

• Detail geometry of the SCT barrel module was created from drawings.

• Detail geometry was installed into the SCT GeoModel program.

• Weight and radiation length were obtained.

• Simple geometry is being created.