Stave 130 Geometry

Peter SutcliffeATLAS Strips WP4 Meeting

26th March 14Liverpool

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Stave Dimensions – Top view

Critical Dimensions:• Overall Length 1277• Width 115 – Taking into Consideration the Bus Tape Width• SMC area 100 x 50• EOS at Z=0 to Silicon Edge 0.1mm• Start of Silicon from Z=1277.1 = 3.36• Module to Module Gap 0.46mm• Pitch of Modules 98mm

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Stave Dimensions – Stereo Side

Critical Dimensions:• EOS at Z=0 to Silicon Edge 0.1mm• Start of Silicon corner from Z=1277.1 = 1.45• Module to Module Gap 0.38mm• Pitch of Modules 98mm• Stereo Angle 40mrad

Stave length is determined by this corner of the last stereo module

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Stave thicknesses

• Inner Skin to Inner skin 5.2• Kapton Bus to Kapton Bus 5.9 (co cured to carbon skin)• Wirebond to Wirebond 10.04mm• ASIC to ASIC 8.24mm

Maximum wire bond height

Z=0 End Closeout

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Z=0 Closeout manufactured from PEEK3D Printed Model

Stave to Stave DimensionsAt Z=0

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Z=1277.1mm End Closeout

• Manufactured from PEEK• Machined or moulded• Closeout is sandwiched around the

cooling tube and the Electrical Break ‘potted in’

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‘C’ Channel Section

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2.8mm Dia Ti reducer

2.275mm Dia Ti Tube

Alumina insulator

2.275mm Dia Ti reducer

Electrical Break

2.8mm Dia Ti Tube

• Assembly vacuum brazed with silver copper eutectic• Brazing temperature around 780°C

• Several have been manufactured and look good. Alumina insulator is very strong

• Electrical break assembly is welded to the stave and inlet/exit tubes.

• E break assembly is potted into the closeout

Richard French

End CloseoutCarbon foam

Potted into end closeout

Stave positions according to the LoI(Hessey and Hayward)

Layer No of Staves

Radii to Centre of Stave

0 28 405

1 36 519

2 44 631

3 56 762

4 (Stub)-not shown

64 862

5 72 1000

Potential Clashes

Worst CaseInner layer with 10° stave angle and 7mm hign DCDC

• Opto side –I think this will sort itself out i.e. slimmer opto packages or both opto packages on outer stave.

• Clash with DCDC to Locking point– Possible solutions:

Place power tracks on the opposite side of tape Make DCDC a planar coil with thickness less than 4mm Reduce size of the cylinder mounted locking point Something else…..……

Details of DCDC InterferenceWith 10°Stave angle (Layer 0)

If 7mm DCDC box is used, the clash with the locking bracket is 1.58mmTo obtain a clearance of say 2mm, the DCDC box would need to be 3.42mm

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DCDC Continued…Possible solutions for DCDC converter clash.1. Reduce the height to 5mm from 7mm

• This would still only give 2mm clearance to the locking point. Is this enough for installation tolerances?

2. Rotate the stereo modules 180°• This would mean having the power on the stereo tape on the opposite side of the stave i.e. locking

bracket side. 3. Shrinking the PCB board?

• Not sure as it may clash with the wire bonds…potential disaster.

Power side

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Item Number Drawing Number Title Material Quantity/Stave

1 NP49-01-100 S-LHC STAVE ASSEMBLY - ABCN130 MODULE SEE PARTS 1

2 NP49-01-104 SILICON MODULE ASSEMBLY BACK TO BACK- ABCN130 SEE PARTS 26

3 END SUPPORT Z=0 LCPE 1

4 LOCKING BRACKET Z=0 LCPE 1

5 LOCKING MECHANISM ASSEMBLY LCPE 5

6 NP49-01-101 ABCD130 SIDE MOUNTED SMC BARE STAVE SEE PARTS 1

7 NP49-01-106 END CLOSEOUT SMC - LH CARBON FIBRE PEEK TEKAPEEK CF30 OR SIMILAR 1

8 NP49-01-130 END CLOSEOUT SMC - RH CARBON FIBRE PEEK TEKAPEEK CF30 OR SIMILAR 1

9 NP49-01-108 ALLCOMP COOLING STRIP ALLCOMP K9 FOAM - SN43 OR SN56 16

10 NP49-01-109 EDGE CHANNEL - LONG CFRP 1

11 NP49-01-110 EDGE CHANNEL SHORT CFRP - - 1

12 NP49-01-111 END CLOSEOUT Z=0 CARBON FIBRE/PEEK TECAPEEK CF30 OR SIMILAR 1

13 NP49-01-112 STAVE TOP SKIN CFRP -K13D2U/RS3 1

14 NP49-01-113 STAVE BOTTOM SKIN CFRP - K13D2U/RS3 1

15 NP49-01-114 STAVE HONEYCOMB CORE - EDGE CFRP HONEYCOMB UCF-126-3/8-2.0 ULTRACORE 2

16 NP49-01-115 STAVE HONEYCOMB CORE - CENTRE CFRP HONEYCOMB UCF-126-3/8-2.0 ULTRACORE 1

18 NP49-01-116 STAVE HONEYCOMB CORE - SMC CFRP HONEYCOMB UCF-126-3/8-2.0 ULTRACORE 1

19 NP49-01-117 EDGE CHANNEL - SMC LONG CFRP - 1

20 NP49-01-118 EDGE CHANNEL - SMC SHORT CFRP - 1

21 NP49-01-120 POWER TAPE - TOP Cu/KAPTON 1

22 NP49-01-121 POWER TAPE - BOTTOM Cu/KAPTON 1

23 NP49-01-125 ALLCOMP COOLING STRIP - Z=0 ALLCOMP K9 FOAM SN43 OR SN56 2

24 NP49-01-129 130nm STAVE COOLING TUBE ASSEMBLY TITANIUM/ALUMINA 1

25 NP49-01-123 1.3m STAVE COOLING TUBE- DIA 2.275mm TITANIUM - CP2 1

26 NP49-01-131 INLET/OUTLET TUBE - 2.8 OD X 0.15 WALL TITANIUM - CP2 2

27 NP49-01-126 ELECTRICAL BREAK ASSY TITANIUM/ALUMINA 2

28 NP49-01-128 ALUMINA INSERT ALUMINA 229 NP49-01-127 NIPPLE- 2.275 DIA TUBE TITANIUM 2

30 NP49-01-131 NIPPLE- 2.8 DIA TUBE TITANIUM 2

Stave Parts List