Enclosures for the RPC Link Boards

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Enclosures for the RPC Link Boards

• Outline
• Introduction
• Periphery
• General
• Services
• Components, materials
• Manufacture, Assembly
• Installation
• Prototypes, Tests
• RE1/1
• General
• Services
• Assembly
• Components, materials
• Installation

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Introduction

• Link Board, LB, (electronics card) is a link
  between chamber and counting room
• Box provides mechanical support for the LB
• Box offers means for cable routing and mounting
• Box offers cable strain relief
• LB replacement during maintenance possible
• Box includes individual cooling system
• Box provides electro-magnetic shield
• Box meets safety requirements
• Several LBs are grouped in to the same box
• 2 different electronic box designs

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General, Periphery design

• Covers RE1/2,3 RE2 RE3 RE4
• Design is derived from
• -available space and maintenance requirements
• -signal cable characteristics (max 12 m cable
  length)
• -symmetry of CMS
• -number and size of cables and connectors
• -electronics heat dissipation
• Design consists
• -max 16 LBs 2 Control Boards, CB, per box
• -size of the LB (and CB) 237 x 160 mm
• -size of the box 400 x 400 x 300 mm
• -number of boxes 48

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Services, Periphery design

• Cooling
• -Power dissipated per LB 10 W -gt per box 180 W
• -Box includes individual cooling system made of
  copper
• -Heat transfer based on radiation and convection
• -Cooling pipe ID/OD 6/8mm, flow rate 2 l/min,
  pressure drop lt 1 bar

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Services, Periphery design

• Electrical and optical cabling
• -max 115 cables are routed from the back side of
  the box
• -cables fibres are routed as round, connectors
  ready assembled
• -box is equipped with an Al sealing transit
  frame
• -Transit units are made of rubber
• -Transit units can handle various cable
  diameters
• -max 16 cables 24 fibres are routed from the
  front side

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Services, Periphery design

• Back plane solution
• -is constructed on a stand-alone LB frame
• -provides cross-connection between RPC cables
  and LB
• -provides cross-connection between LB - CB
• -provides connection for LV

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Components, materials, Periphery design

• Al box
• Plastic attachment units
• Copper cooling assembly
• Al LB frame
• Plastic/copper connectors
• Al/brass cable fibre frame
• Al/EPDM rubber sealing transit units
• Mass 30 kg

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Manufacture, Assembly, Periphery design
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Manufacture, Assembly, Periphery design
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Installation, Periphery design
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Prototypes, Tests, Periphery design
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General, RE1/1 design

• Design is derived from
• -extreme space limitations for the box size
• -number and size of cables and connectors
• -location of services
• -space for the services
• Design consists
• -6 LBs 1 Control Boards, CB, per box
• -size of the LB (and CB) 245 x 120 mm (differs
  from periphery design)
• -size of the box 298 x 298 x 161 mm
• -number of boxes 12

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Services, RE1/1 design

• Cooling
• -Power dissipated per LB 10 W -gt per box 70 W
• -Cooling pipe ID/OD 6/8mm, flow rate 2 l/min,
  pressure drop lt 1 bar

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Services, RE1/1 design

• Electrical and optical cabling
• -62 cables 12 fibres are routed from the back
  side of the box
• -Cable OD limited to 11.5 mm
• -Cable max diameter at the point where it is
  routed inside 8 mm
• -cables fibres are routed as round, connectors
  ready assembled
• -box is equipped with an Al sealing transit
  frame
• -Transit units are made of rubber

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Services, RE1/1 design

• Back plane solution
• -is constructed on a stand-alone LB frame

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Services, RE1/1 design

• Back plane solution
• -provides cross-connection between
• RPC LB
• I2C CB
• CB DCS
• LB CSC
• MLB SLB
• LB CB
• LV LBCB

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Assembly, RE1/1

• Cooling system and LB frame assembled first
• This sub-assembly is installed into the box

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Components, materials, RE1/1 design

• Basically same materials as in periphery design

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Installation, RE1/1 design