Transcript Disc services

End-cap Mechanics FDR
Power Tapes and Optical Fibres
Steve Temple, RAL
1 November 2001
S Temple
CLRC
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End-Cap Disc Services
Power Tapes and Optical Fibre Harnesses

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
S Temple
CLRC
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End-Cap Disc Services
Power 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
S Temple
CLRC
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End-Cap Disc Services
Power 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
S Temple
CLRC
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End-Cap Disc Services
Power 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)
S Temple
CLRC
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End-Cap Disc Services
Power 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
S Temple
CLRC
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End-Cap Disc Services
Power 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)
S Temple
CLRC
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End-Cap Disc Services
Power Tapes and Optical Fibre Harnesses

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
S Temple
CLRC
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