Tracker Support Tube Tracker EDR November 15th/16th 2000 M.Oriunno CERN/EP Tracker Support Tube Marco Oriunno CERN/EP Division on behalf of Tracker Integration

Tracker EDR November 15th/16th 2000

M.Oriunno CERN/EPTracker Support Tube

Tracker Support Tube

Marco Oriunno

CERN/EP Division

on behalf of

Tracker Integration GroupH.Breuker, M.Oriunno, P.Petagna, H.Postema

CMS Tracker EDR



Silicon Strip Tracker:

Tracker Support Tube

L ~ 5,4 meters

Outer Barrel

Inner Barrel

Endcap

Pixel

~ 2

,4 m

eter

s



Outline

Main FeaturesMain FeaturesRequirements and materialsRequirements and materialsCalculationsCalculationsManufacturing StudyManufacturing StudyTechnical SpecificationsTechnical Specifications



•CF/Nomex Sandwich Shell, 30mm thick

•CF/ Rails filled with glass wool

•Glass/Epoxy profiles supporting the services and the Thermal screen

TST Features

Rails



Requirements and Materials

• High radiation transparency i.e. low mass density

•High Stiffness E i.e. E/

• High position stability in the time i.e. low CTE and CME

•Radiation Hardness

HS:T300/Epoxy

HM:M40J/Cyanate

UHM:M55J/Epoxy

Kg/m3) 1550 1700 1800Ex

GPa)

Ey Gpa)

Gxy Gpa)

xy

12585

0.3

23174

0.3

3476.55

0.3

KxW/moK)

KyW/moK)

40.7

501.5

602

x10-6 oK)

y10-6 oK)

-0.4530

-0.535

-0.530



•For lightweight structures, as the Tracker, a sandwich shell cylinder is the best compromise between weight and stiffness.

•The limited space available for the structure, makes definitively sandwich construction the best choice.



Finite Element calculations

Component Weight (Kg)

Outer Barrel 620Inner Barrel +Pixel 150

Silicon Barrels services 180Silicon Endcap (x2) 680

Silicon Endcaps services 400Beam Pipe 10

Thermal Shield 50TST 200

Total 2290



Laminate engineering constants and expansion coefficients

Laminate : T300_isotropicModified : Tue Aug 04 17:17:22 1998

Lay-up : ((0a/+45a/-45a/90a)2)SE

Plya T300;914;UD-.125/1580/61.5

Moduli (GPa )In-plane FlexuralE_x = 53.10 E f_x = 70.13E_y = 53.10 E f_y = 36.96G_xy = 20.19 G f_xy = 19.21

Poisson's ratiosnu_xy = 0.315 nu_yx = 0.315

Thermal expansion coefficientsIn-plane Curvat.

e-6/°C (1/m)/°Calpha_x = 2.57 delta_x = 0alpha_y = 2.57 delta_y = 0alpha_xy = 0 delta_xy = 0

Moisture expansion coefficientsIn-plane Curvat.

e-2/w% (1/m)/w%beta_x = 0.0358 phi_x = 0beta_y = 0.0358 phi_y = 0beta_xy = 0 phi_xy = 0

Laminate E and G

x-direction -->

E G

GPa

GPa

60

40

20

0

20

40

60

60 40 20 0 20 40 60

Laminate : T300_isotropicModified : Tue Aug 04 17:17:22 1998

Lay-up : ((0a/+45a/-45a/90a)2)SE

Plya T300;914;UD-.125/1580/61.5

Skin Material Properties T300/Epoxy



FEA Results

Load Condition Max. verticaldisplacement (mm)

Silicon Barrels (Inner+Outer) 0.235Silicon Endcap and Services 0.196TST weight, Thermal Shieldand Services

0.158

Total 0.589



Seismic calculations:

0.15g horizontal load



Static and Seismic Animations



0

0,5

1

1,5

2

2,5

3

3,5

4

0,5 1 1,5 2

T300,h=20

T300,h=25

T300,h=30

M40J,h20

M40J,h25

M40J,h30

skin (mm)

Dis

p (

mm

)

Materials and Geometry Effects

}T300

}M40J



Manufacturing

•Composite Structures can be manufactured following different processes, achieving the same results:

–Vacuum Moulding –Autoclave–Filament Winding

•The crucial item in the definition of manufacture costs is the tooling design

•The cost of raw material is only 20% of the total cost

•High performance materials affect the total costs in terms of complicated curing procedure

•For high performance materials, the quality of the final product depends strongly on the experience of the manufacturer



Manufacturing Study I

•The conventional way to manufacture sandwiches is the mould process with curing in an autoclave, using moulds made of carbon fibres reducing the thermal mismatch between the moulds and the sandwich during the cure, if the final tolerance on the dimensions is tight.

•Processes like filament winding require relatively simple tooling, allowing the production of the entire cylinder in one go

•Filament winding is widely used for manufacturing of medium size fuselages in the aeronautical industry where the size of the series pays off the manufacturing cost of the tooling: this is not the case for the TST where only one piece has to be made



Manufacturing Study II

Medium-size companies, having experience on same size structures have been contacted to produce a preliminary study on the technological feasibility. The proposed solution are very similar:

•Composite Optic Industries (USA)

•Plyform (Italy)

•Composite Tooling and Structure (UK)





CMSSiliconTracker

TECHNICAL SPECIFICATIONTRACKER SUPPORT TUBE

IT-2434C/REV/EP/CMS Responsible Status: Draft Date: October 11, 2001 Page: 1 of 11

TECHNICAL SPECIFICATIONFOR THE

CMS TRACKER SUPPORT TUBE

(IT-2434C/REV/EP/CMS)

AbstractThis document defines the specifications for manufacturing the Tracker Support Tubefor the CMS Silicon Tracker. The Tube is a low-mass structure with a diameter of 2.4meters, a length of 5.4 metres, made of carbon fibre and Nomex sandwich. Auxiliarysystems, for the installation of the sub detectors and the support of services, beingrelevant part of the Tracker Support Tube assembly, have been included in thisspecification.



Technical Specifications’ Index

1 INTRODUCTION

2 SCOPE OF THE TENDER

3 GENERAL CONDITIONS FOR TENDERING AND CONTRACTING

4 OVERALL DESCRIPTION

5 DETAILED DESCRIPTION

6 DOCUMENTS

7 QUALITY CONTROL AND TESTS

8 PACKING, TRANSPORT AND DELIVERY

Part II QUALIFICATION CRITERIA

Part III TECHNICAL QUESTIONNAIRE

Documents

Tracker Support Tube Tracker EDR November 15th/16th 2000 M.Oriunno CERN/EP Tracker Support Tube Marco Oriunno CERN/EP Division on behalf of Tracker Integration