lst mechanical design review utility routing, cableways & crate locations peter kim october 21,...
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LST Mechanical Design Review
Utility Routing, Cableways & Crate Locations
Peter KimOctober 21, 2003
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October 21, 2003 P.Kim 2
OVERVIEW• SPACE ISSUES
– Where Do All the Cables Go?– Cable Routing inside the Sextant– Cable Routing Around the Detector– Cable Routing to Outside Shielding Wall
WITHOUT DISTURBING OTHER COMPONENTS
• Some RPC Infrastructure Remains– Top/Bottom Sextants installed in 2004, Side Sextants
in 2005 – Cylindrical RPC & ENDCAP RPC Operational after
2005
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October 21, 2003 P.Kim 3
Current IFR/RPC System
• High Voltage– CAEN HV Supply in Elec. Hut outside the Shielding Wall– HV Distribution Boxes positioned around BABAR Detector– 8 kV HV Cables to RPC Modules behind the Corner Plates
• Gas System– Gas Manifold/Bubblers/Flowmeters in Racks above BABAR– Teflon/Polyflo Tubes feed RPC Modules behind the Corner
Plates
• Signal Readout– Preamps on RPC Modules – Twisted Pair Flat Ribbon Cable carries Signal to FEC in Racks
around BABAR Detector; Processed Signals go to DAQ via Optical Fibers
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October 21, 2003 P.Kim 4
RPC HV Cable Routing
Gas Supply
HV Cables
Drawing from R. Principe
Shielding Wall
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October 21, 2003 P.Kim 5
BABAR CABLE TRAYS
LST will use North Tray
TRAYS are Busy, but Space available for LST HV/Gas Lines
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October 21, 2003 P.Kim 6
RPC Gas Tubes
TEFLON Gas Supply Tubes TEFLON / POLYFLO Connections
Backward SideFront SideTEFLON
POLYFLO
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October 21, 2003 P.Kim 7
A Sextant full of RPC
From R. Boyce’sTalk this Morning
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October 21, 2003 P.Kim 8
LST High Voltage System• HV Distribution (Baseline Design)
– HV Supply located above Electronic Hut outside Shielding Wall– One HV Cable (10-wire or 20-wire Kerpen) for each LST Module– Total of 564 Cables (94 Cables in each Sextant)– No Distribution Boxes near BABAR: Long Cables (25-40 m) from HV Supply to LST Modules
• Cable Trays & Cableways– HV Cables need to be Separated from Other Supply Lines– New Cable Tray under the Shielding Wall– New Cableways to run HV Cables Around BABAR Detector
• Inside Each Sextant– Top/Bottom Sextants: Use Open Space Either Side of CENTER PLATE – Side Sextants: Use existing RPC Signal Cable Box in the Middle
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October 21, 2003 P.Kim 9
High Voltage Supply
BABARDetector
Electronic Hut
RPC HV Supply
LST HV Supply
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October 21, 2003 P.Kim 10
BABAR Viewed From South
Center Plate
Corner Plate
Side PlateRemoved
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October 21, 2003 P.Kim 11
Closeup View of Side Sextant
Side Plate Goes Back in Here
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October 21, 2003 P.Kim 12
Open Box
Signal Readout Cable Box(2” Wide, 5” Deep)
Signal Readout Cable Box(2” Wide, 5” Deep)
Space Available forLST HV/Gas Lines(6” Wide, 5” Deep)
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October 21, 2003 P.Kim 13
High Voltage Cable
KERPEN 6 kV HV Cable
Zero Halogen, Frame Retardant Polymer Sheath
Diameter: 9.1 mm for 10-conductors 10.7 mm for 20-conductors
Minimum Bending Radius = 6 x Diameter Tinned copper, Flexible stranded Conductors (0.16 mm diameter)
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October 21, 2003 P.Kim 14
LST Gas System• Gas Distribution
– Reuse Rack space on Top of BABAR, currently occupied by RPC Crates
– New Gas Manifolds, but Reuse RPC Bubblers/Flow meters– LST Gas is NON-FLAMMABLE
• Reuse RPC Teflon Tubes– Need to install 60 more lines (228 for RPC; 288 for LST)– RPC Tubes going to the Front Side need to be Rerouted (LST Gas Tubes go to Backward Side only)
• Polyflo Tubing– Teflon/Polyflo Connections – Two Bundles of 24 Polyflo Cables (Input/Output Lines) enter Sextants in the Middle
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October 21, 2003 P.Kim 15
HV-GAS Supply for LST
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October 21, 2003 P.Kim 16
LST Electronics Readout
• BASELINE DESIGN– Z-Strip Signal Read out from the Back Side 1152 Channels per Sextant– Phi Signal Read out from the Front Side 758 Channels per Sextant– AMPHENOL Twisted/Flat Readout Cable– Preamps on FEC, Not on the LST Module
– 7 Crates for Z Signals and 6 Crates for Phi Signals– Output Digital Signal to DAQ via Optical Fibers
• CRATE Features– VME Standard 6U High (26.5 cm); 55 cm Wide, 55 cm Deep– 7 Crates for Z Signals and 6 Crates for Phi Signals– All Input/Output Cables are Connected from the Front
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October 21, 2003 P.Kim 17
Amphenol Readout Cable
MicroribbonTwitst/Flat Cable
17 Twisted Pairs Shielded & Jacketed
Diameter at Round Section: 0.75 cm
48 Phi Cables / Sextant 72 Z Cables / Sextant
Enough Room in Two 5 cm x 12 cm Cable Boxes / Sextant
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October 21, 2003 P.Kim 18
Examples of Conduits for Phi Signal Readout
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October 21, 2003 P.Kim 19
Rack Locations
• Keep the Racks Close to LST Modules– Deterioration of Raw Signal over Distance– Higher Background Noise Pick Up over Distance
• Space Considerations– Allow Access to Other Parts of BABAR Detector, Endcap
Doors, Earthquake Braces, etc.– Cooling Fans / Air Circulation– Removal and Insertion of FEC Cards
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October 21, 2003 P.Kim 20
Electronic Rack Locations on the Forward Side
Drawing fromR. Principe
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October 21, 2003 P.Kim 21
Electronic Rack Locations on the Backward Side
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October 21, 2003 P.Kim 22
Space Check with Mockup Crates
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Installation Schedule
• Racks & Fixtures Design, Fabraication, and
Installation before July Shutdown
• New Cable Trays and Conduits installed while
RPCs are being removed
• GAS Tubes and HV Cables will be laid down One
Layer at a time, following LST module install schedule
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SUMMARY
• NO SPACE PROBLEM EXPECTED UNDER BASELINE DESIGN
• LOTS OF WORK TO DO, BUT WILL BE ABLE TO MEET IFR INSTALL SCHEDULE FOR 2004/2005