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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. 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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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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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