CLRC 1S Temple

End-cap Mechanics FDRPower Tapes and Optical

Fibres

Steve Temple, RAL

1 November 2001

CLRC 2S Temple

Disc Services Design Overview» Disc services consist of :

– Cooling Structures (already discussed)– LM Power Tapes– Optical Fibre Harnesses– DCS Components– FSI Components

» Design presented here for discs 2,3,4,5 and 6 with three module rings

» Services routing designed to allow same routing for discs with less module rings

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses

CLRC 3S Temple

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses LM Power Tape Layout

» 33 power tapes per quadrant, each with individual routing» 4 power tape patch panels per quadrant , on edge of the disc» All tapes routed under cooling pipes

– Clearance between disc and cooling pipe = 1.13±0.35– Allows 3 stacked power tapes under pipe at any one point - Routing

maintains this – Preferable to going over cooling pipes as it avoids risk of interference

with delicate module components» At all times the correct ‘sense’ of the tape is maintained to enable

connection at the module and patch panel end» Front disc tapes are routed from the front of the disc through a disc

aperture to the patch panel on the rear of the disc» The minimum bend radius is 4.5mm

CLRC 4S Temple

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses

Power Tape Design» Cross -Sectional envelope used is 21 x 0.25 mm» Problems with manufacture of current design tapes have

resulted in the new tape design (detailed in ATL-IS-ES-0034)

» New tape design enables 1 tape under cooling pipe at any

one time - i.e tape width is now 3.4 mm wide » New Routing Required - Simpler due to greatly reduced tape

width

CLRC 5S Temple

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses

Optical Fibre Harness Layout / Design» Each quadrant contains 6 fibre harnesses» There are two optical fibre patch panels per quadrant on the edge of the

disc» Harness routing is optimised to give minimum ‘dark’ fibre when

transferring the routing design to discs 1,7,8 and 9 » Each fibre harness is routed from the patch panel under cooling pipes

(where appropriate)– Avoiding interference with delicate module components

» Each harness is made up of one 12 way tape and one 6 way tape– Routed from the patch panel to the split point– Individual module links are then routed (3 fibres - 2 from 12 way and 1

from 6 way tape)

CLRC 6S Temple

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses

Optical Fibre Harness Layout / Design (Cont’d)» Front disc harnesses are routed through disc apertures near the

inner edge of the disc» Minimum fibre bend radius of 20 mm is always observed

CLRC 7S Temple

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses

Other Disc Services» DCS Components - Exact positions yet to be defined but

possible spaces identified– Air Temperature Sensors - Mounted on pedestals away from

disc (Outside envelope 15x15x5mm)– Mechanical Structure Temperature Sensors - Bonded to disc

(Outside envelope 4x2.2x1mm)– Humidity Sensors - Positioned close to air temp sensors

(Outside envelope 20x5x5mm)– Barometric Pressure Sensors - (Outside envelope

15x10x4mm)

CLRC 8S Temple

Other Disc Services (Cont’d)» FSI Alignment Components

– Alignment Jewels (Outside envelope 32x35x30mm) positioned on rear of disc at three positions (with the exception of disc 9)

– Retro-reflectors are mounted on module mounting nuts - due to space restrictions on fully populated front disc

End-Cap Disc ServicesPower Tapes and Optical Fibre

Harnesses