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Barrel Capacitors. With socket and bent pin, forms capacitor assembly Duke supplies capacitors, Hampton assembles. Baseline: Johanson 202S43W102KV4E: 202: 2000V S43: size 1812 = 4.45 x 3.18 x 2.16 mm W: X7R dielectric – but NP0 now available 102: 1,000 pF K: tolerance ±10%

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barrel capacitors
Barrel Capacitors
  • With socket and bent pin, forms capacitor assembly
  • Duke supplies capacitors, Hampton assembles
slide2
Baseline:
    • Johanson 202S43W102KV4E:
      • 202: 2000V
      • S43: size 1812 = 4.45 x 3.18 x 2.16 mm
      • W: X7R dielectric – but NP0 now available
      • 102: 1,000 pF
      • K: tolerance ±10%
      • V: nickel barrier termination
      • 4: no marking
      • E: 7 inch embossed reel (1000 pieces)
  • Four reels from different lots purchased for tests
slide3
HV discharging tests – Duke 2002:
    • 50 capacitors from each lot charged up @ 2000V then shorted – repeat 3000 times
    • Measure capacitance, current leakage, arcing
    • Results:
      • a few failures on surface (dirt?)
      • Average capacitance decreases by a few %
    • Conclusion: capacitors pass test
slide4
Radiation Hardness Test – Duke/N.C. State 2003
    • PULSTAR reactor:
      • 1 MW pool-type; 4% enriched pin-type fuel consisting of uranium dioxide pellets in zircaloy cladding
slide5
Samples for exposure:
    • For each lot: (four lots)
      • 10 capacitors soldered in parallel on board – will be at HV during test
      • 10 capacitors left in reel packaging
slide6
All samples, plus assorted glue/tape samples, inside aluminum tube – 19 mm o.d. x 250 mm long – required to fit into reactor
slide7
Radiation: 60 minutes of 30% reactor power
    • Fast and slow neutrons
      • Total n fluence measured with Co foils – varied from 1.2 to 9 x 1014 / cm2 (top to bottom)
      • ~ 50 years LHC operation
    • Gammas
      • ~ 2 Mrad
  • 40 capacitors at 2000 V:
    • Leakage current:
      • .4 μA before / after irradiation
      • .8 μA during
slide8
Results:
    • Mounted capacitors being kept at HV – no problems so far
    • Possible decrease in capacitance (< 3%)
    • Plan to do discharge test on unmounted ones – when they cool off
    • Will look for “Anatoli Desk Effect”
    • Plan to test NP0 version
    • Plan to test full assemblies from Hampton
  • Conclusion: baseline capacitors OK