ATLAS TRT Duke University CERN, Feb. 2003 Barrel Capacitors With socket and bent pin, forms...

ATLAS TRTDuke University CERN, Feb. 2003

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% V: nickel barrier termination 4: no marking E: 7 inch embossed reel (1000 pieces)

Four reels from different lots purchased for tests


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


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


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


All samples, plus assorted glue/tape samples, inside aluminum tube – 19 mm o.d. x 250 mm long – required to fit into reactor


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


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

ATLAS TRT Duke University CERN, Feb. 2003 Barrel Capacitors With socket and bent pin, forms...

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