High voltage distribution for rpcs
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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

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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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