HV capacitor Testing.

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Presentation transcript:

HV capacitor Testing

Capacitors under testing Two tasks Capacitor testing (Duke) Capacitor preparation (Hampton) Capacitors under testing Johanson surface mount 1000pf, rated 2000 V, size 821. Material : X7R Choices are limited due to space Capacitors from four different lots (batches). ~Two years ago, the same capacitors (from different lots) were radiation tested at CERN and the results were mixed.

HV testing HV cycle Results Conclusion : Pass Connect 30 capacitors from each batch to HV=2000 V and discharge. Measure the total capacitance every 50 discharges. Number of cycles : 2000 Results Batch 1 One capacitor Surface HV breakdown during 1500-1550 cycles Inner HV breakdown during 1600-1650 cycles Batch 2/3/4 : No problem Conclusion : Pass

Test setup

Plan Repeat the same test with capacitors from HU (encapsulated and legs are attached) Long term test 30 capacitors from each batch connected to HV=2000 V and current is monitored. Irradiation test – CERN Requirement : All capacitors from all batches should pass. Decision by the end of 2002. There should be no problem in getting the capacitors (~6 weeks). Radiation test on ~100 random samples once the production batch is available Option in case of failure Go to lesser capacitance with different material (NPO)