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High Voltage Distribution for RPCs. Simple Model of Detector & HV Specifications & Requirements Simple HV Distribution Layout Parts & Costs A Possible Alternative to Conventional System. Simple Model of Detector & HV. Detector 300 repetitive layers 20m x 20m cross section

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high voltage distribution for rpcs
High Voltage Distribution for RPCs
  • Simple Model of Detector & HV
  • Specifications & Requirements
  • Simple HV Distribution Layout
  • Parts & Costs
  • A Possible Alternative to Conventional System

Richard Talaga

simple model of detector hv
Simple Model of Detector & HV
  • Detector
    • 300 repetitive layers
    • 20m x 20m cross section
    • 2m x 2m per RPC
      •  100 RPCs per layer
  • HV
    • 1µA/m2 dark current (BELLE result)
      • mostly through noryl spacers
    • 400 µA per layer, at best
    • Typical commercial HV channel provides ~1mA @10kV
    • HV System: 1ch/layer  300 channels for entire detector
      • 1ch for 100 RPCs

Richard Talaga

specifications requirements
Specifications & Requirements
  • HV distribution per layer
    • Ability to turn on/off
      • Any one RPC?
      • Any of one cluster of RPCs ?
    • Ability to provide more than 1 value of HV per plane
    • Ability to track down bad RPC (high current)

Richard Talaga

simple hv distribution layout
Simple HV Distribution Layout
  • 100 RPC/layer
  • Assume 100 RPC connections to the outside
  • Four HV distribution boxes per layer (25 ch/box)
    • 100 pairs of HV connectors/layer + 8 pairs for boxes
    • 240m of cables per quadrant  960 m/layer

Distribution box

HV Channel

Detector cross section

Richard Talaga

parts and costs
Parts and Costs
  • HV System: CAEN SY1527 (replaces SY 127)
    • Module A1526: 6 HV channels @ 1mA/15kV per channel
      • 50 modules  300 channels (1 per layer) $250k
    • Crate SY1527: fits 8 Modules A1526
      • 7 crates (6 full & 1 with two modules) $82k
  • RG58 cable
    • 960m/layer x 300 layers =288,000m = 950,000 ft
      • $136/1000ft spool  $129k
  • SHV connectors: one pair per RPC
    • RPC end is soldered
      • 30,000 RPCs x $23/pair (for qty of 100) $690k
  • Distribution boxes
      • 1200 boxes @ ~$100/box (no connectors) $120k
  • 10 kV connectors to PS
      • 300 x $35 $10k
  • Total HV M&S costs $1.28M

Richard Talaga

parts and costs notes
Parts and Costs: Notes
  • CAEN HV modules
    • 10 kV are being discontinued: SY 127 model A328
      • 2mA @10kV ($1,400/channel)
    • 15 kV model A1526 may be built to provide 10 kV with increased current ~1.3 mA and less potent HV connectors
      • Note: $830/channel for standard model
  • Connector cost
    • 10kV connectors cost $70/pair $36 for bulkhead; $34 for cable
    • 8kV SHV connectors cost $23/pair $9 for bulkhead; $14 cable
      • SHV connector cost may be less because quote for qty 100

Richard Talaga

a possible alternative to conventional system
A Possible Alternative to Conventional System
  • Use Cockroft-Walton HV supplies
    • Used in ZEUS @2kV
    • Each RPC has its own supply, mounted nearby (in absorber material ?)
    • One low voltage cable replaces HV cable & HVconnectors
    • Reduce the possible corona discharge in long HV cables
    • Safer: No HV outside the detector
    • Cost compared to $1.3M conventional system
      • Possibly ~$20-$30 per channel
      • At $40/channel x 30,000 ch = $1.2M

Richard Talaga

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