Engineering Design ReviewEngineering Design Review for TRD-Readout Chamber for TRD-Readout Chamber

Mechanical DesignMechanical Design

Bernd Windelband

University of Heidelberg

TRD and TPC in Space FrameTRD and TPC in Space Frame

ROC Segmentation in Individual LayersROC Segmentation in Individual Layers

Different Types of ROC‘sDifferent Types of ROC‘s

ATRD0901P6

16 different types of ROC‘s from 16 different types of ROC‘s from

1080mm x 974mm x 105mm, type L1C01080mm x 974mm x 105mm, type L1C0 to to 1585mm x 1196mm x 105mm, type L6C1,1585mm x 1196mm x 105mm, type L6C1,

ROC L6C1 (1585mm x 1196mm)ROC L6C1 (1585mm x 1196mm)

Mechanical Requirements of ROCMechanical Requirements of ROC

• to keep wire tension (~90kg) and drift gas overpressure (1mbar)

• to ensure required flatness of padplane (<200µm) and radiator (<1mm)

very rigid structure• small radiation length („made

out of nothing“)• radiator and pad- readout panel

have to be sandwich structures

ROC Cross Section, View in zROC Cross Section, View in z

each chamber consists of

•48mm radiator

•37mm drift volume with wire planes

•~20mm backing structure with pad plane

•main frame with radiator main frame with radiator serves as the main support serves as the main support structures to hold the wire structures to hold the wire tension.tension.

•pad plane does not see the pad plane does not see the wire load.wire load.

ROC Cross Section, View in ROC Cross Section, View in φφ

Pad- Readout panel

Frontplate withChamber to ChamberSealing Connection

Voltage Divider

Chamber to Chamber Sealing ConnectionChamber to Chamber Sealing Connection

• Quad-Ring-Seal unit glued to frontplate

• connection with PEEK tube, di=17mm

• serves at the same time as chamber to chamber alignment

Thickness Determination of the CF-Layers forThickness Determination of the CF-Layers forPad- Readout Panel and RadiatorPad- Readout Panel and Radiator

0

0,2

0,4

0,6

0,8

1

1,2

0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1

thickness of CF-layer [mm]

def

lect

ion

f [

mm

]

case 1

case 2

f = (cf = (c33 · p · b · p · b44 )/(6 · E )/(6 · E

DD · t · (t + c) · t · (t + c)22) )

0

0,02

0,04

0,06

0,08

0,1

0,12

0,14

0,16

0,18

0,2

0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1

thickness of CF-layer [mm]

def

lect

ion

f [

mm

]

case 1

case 2

Pad- Readout Panel,Pad- Readout Panel,20mm core thickness20mm core thicknessffmaxmax <= 200 <= 200μmμmResult: 0.4 mmResult: 0.4 mm

Radiator,Radiator,48mm core thickness48mm core thicknessffmaxmax <= 1mm <= 1mmResult: 0.1 mmResult: 0.1 mm

t = thickness of carbon fibre facing,t = thickness of carbon fibre facing,p = pressure loadp = pressure loadc = thickness of the core material,c = thickness of the core material,EEDD = Young’s Modulus of the layer, = Young’s Modulus of the layer,

2a = panel length,2a = panel length,2b = panel width,2b = panel width,cc33 = correction function (a/b, load case). = correction function (a/b, load case).

case 1 =clampedclampedcase 2 = simply supportedsimply supported

Full size Prototype L6C1 ChamberFull size Prototype L6C1 ChamberComponents – Production and AssemblyComponents – Production and Assembly

Pad- Readout PanelPad- Readout Panel ->-> INVENTOR (Krakow)INVENTOR (Krakow)->-> PI Uni Heidelberg (cutouts, glueing of pad planes)PI Uni Heidelberg (cutouts, glueing of pad planes)

RadiatorRadiator ->-> INVENTOR (panels)INVENTOR (panels)->-> IKP Uni Muenster (assembly)IKP Uni Muenster (assembly)

Main frame, wire ledges, etc.Main frame, wire ledges, etc. ->-> PI Uni Heidelberg (production and assembly)PI Uni Heidelberg (production and assembly)

Three main production steps:Three main production steps:

•glueing main frame to glueing main frame to radiatorradiator•electrical connections and electrical connections and applying the wire planesapplying the wire planes•closing the chamber with pad- closing the chamber with pad- readout panelreadout panel

ROC Prototype L6C1, RadiatorROC Prototype L6C1, Radiator

ROC PrototypeROC Prototype L6C1, Test AssemblyL6C1, Test Assembly

ROC PrototypeROC Prototype L6C1L6C1Main Frame glued to RadiatorMain Frame glued to Radiator

ROC PrototypeROC Prototype L6C1L6C1applying additional layer of glue along the rimapplying additional layer of glue along the rim

Purpose of L6C1 PrototypePurpose of L6C1 Prototype

Load from wires and drift gas pressure most critical for largest chamberLoad from wires and drift gas pressure most critical for largest chamber

•Verify design of largest chamber -> L6C1Verify design of largest chamber -> L6C1

•behavior of main frame under wire loadbehavior of main frame under wire load•deformation of pad- read out panel and radiator under overpressuredeformation of pad- read out panel and radiator under overpressure•to learn assembly procedure and application of the wire gridsto learn assembly procedure and application of the wire grids•test of chamber performance (Harry)test of chamber performance (Harry)

Wire Tension TestWire Tension Test

Wire Tension Test - DetailWire Tension Test - Detail

MeasurMeasureement of the Deflectionment of the Deflection

Deflection of Chamber Side Profile under Wire TensionDeflection of Chamber Side Profile under Wire Tension

0

50

100

150

200

250

300

0 500 1000 1500

gauge position on frame (mm)

de

fle

cti

on

of

fra

me

(m

) 5 kg, table

6 kg, table

4 kg, table

3 kg

4 kg

5 kg

6 kg

7 kg

8 kg

ROC PrototypeROC Prototype L6C1L6C1voltage dividervoltage divider

ROC PrototypeROC Prototype L6C1L6C1applying the wire planesapplying the wire planes

Wire Number

0 100 200 300 400 500 600 700 800

Wire

Ten

sion

(cN

)

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

160

170

180

190

200

Wicklung 75µm CuBeKathode TRD 75µm CuBe

Wire Tension on Winding Frame and on Wire Tension on Winding Frame and on ROCROC

Padplane for PrototypePadplane for Prototype

connector sideconnector side

Pad sidePad side

Prototype on Test StandPrototype on Test Stand

Further Results of TestsFurther Results of Tests

•Chamber main frame deformes 150 Chamber main frame deformes 150 μm under wire tension indicated in TDR -> 10% μm under wire tension indicated in TDR -> 10% loss in wire tension.loss in wire tension.

•Additional tooling necessary for chamber assembly Additional tooling necessary for chamber assembly -> mounting table for chamber frame.-> mounting table for chamber frame.-> computer aided measurement sytem-> computer aided measurement sytem

•Deformation Pad- Readout Panel and Radiator under overpressure within the Deformation Pad- Readout Panel and Radiator under overpressure within the requirements (talk of Harry and Damian).requirements (talk of Harry and Damian).

•Large capacitance between Carbon fibre layer close to padplane and padplane Large capacitance between Carbon fibre layer close to padplane and padplane -> replacement of this CF-layer by insulating material (glass fibre, Kevlar). -> replacement of this CF-layer by insulating material (glass fibre, Kevlar).

Infrastructure for Chamber ProductionInfrastructure for Chamber Production

•mounting tool for the chamber main frame and glueing to radiator mounting tool for the chamber main frame and glueing to radiator

•flat tables flat tables

•vaccumtable (glueing pad plane to pad- readout panel)vaccumtable (glueing pad plane to pad- readout panel)

•cleanroom and wire winding machine (to produce and glue the wiregrids to the cleanroom and wire winding machine (to produce and glue the wiregrids to the chamber)chamber)

•milling machine with min. 1,6m machining length (production of chamber main milling machine with min. 1,6m machining length (production of chamber main frame parts)frame parts)

•computer aided measuring systemcomputer aided measuring system

Mounting Table for ROCMounting Table for ROC

New Wire Winding MachineNew Wire Winding Machine

Glass Table and Crane in the New CleanroomGlass Table and Crane in the New Cleanroom

Refurbished Milling MachineRefurbished Milling Machine

Computer Aided Measuring System (Hecht)Computer Aided Measuring System (Hecht)

-> System will be adapted to our table size and specific needs-> System will be adapted to our table size and specific needs

Next StepsNext Steps

• Production of Chamber Stack.Production of Chamber Stack.

• Production of Chamber Mounting Table.Production of Chamber Mounting Table.

• Test of Pad- Readout Panels with Kevlar, Kevlar-Tedlar Test of Pad- Readout Panels with Kevlar, Kevlar-Tedlar and Glassfibre layer instead of CF.and Glassfibre layer instead of CF.

• Final Set up of CleanroomFinal Set up of Cleanroom

• Installation of Measuring SystemInstallation of Measuring System