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High Voltage Plates and Capacitor Status

High Voltage Plates and Capacitor Status. Jack Fowler. Update since the last meeting. Dimensional problems encountered with the thick plates visited manufacturer of thick plates in Feb ‘01 reviewed the process and specific problems with parts

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High Voltage Plates and Capacitor Status

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  1. High Voltage Plates and Capacitor Status Jack Fowler

  2. Update since the last meeting • Dimensional problems encountered with the thick plates • visited manufacturer of thick plates in Feb ‘01 • reviewed the process and specific problems with parts • series of type 3 plates were machined with new process • parts were thoroughly inspected and being evaluated • from these parts we will determine machinist capabilities • manufacturer is currently making series of all sizes to confirm changes Fowler Duke HEP

  3. HV Plate Production Status • For all types, the thin plates and kapton flex circuits have been produced • HV Plates Type 1 • Thick Plates - 20 sets currently going through 100% dimensional inspection • HV Plate Assemblies - Received, tested and approved 8 sets. • HV Plates Type 2 • Thick Plates - 18 sets currently going through 100% dimensional inspection • HV Plate Assemblies - Received, tested and approved 8 sets. • HV Plates Type 3 • Thick Plates - 10 sets currently going through 100% dimensional inspection • HV Plate Assemblies - 1set approved. Two sets currently in manufacturing process. • All other components for the assembly have been procured Fowler Duke HEP

  4. Final draft of QA procedures • Visual inspection • Dimensional inspection (hole location, diameters, flatness, overall dimensions) • Continuity tests • Resistance values • Kapton flexibility test • High voltage breakdown up to 3 kV • From ground • Between straws • Leakage current Fowler Duke HEP

  5. Continuity, Resistance, Flexibility Tests • All traces are 100% inspected for continuity • All traces are 100% inspected for resistance value of protection resistor • Kapton flex test performed on 2.0 mm radius. Fowler Duke HEP

  6. HV Breakdown Tests • Plates are tested throughout the production • initially from supplier • after the Kapton forming process • after insertion of straws • after 1st end outer wire supports are conductive glued • after 2nd end outer wire supports are conductive glued • after sealing glue is applied to outside of HV plate • after potting of inside of module • after stringing • after final gluing and leak test Fowler Duke HEP

  7. Qualification Tests • Measurement of Leakage Currents • This is currently done when the HV plate is installed in the shell • Typical values are 20 nA • Micro discharges • HV kapton breakdown tests • Every module is raised to 3kV • Breakdown should occur at 9 kV • due to 3 mm gap between connector traces • thickness and rating of current kapton used Fowler Duke HEP

  8. HV Breakdown Failure Tests • Samples tested on HV plate assemblies • Tested in air at 32 % RH, 22 °C • Breakdown occurred 6.8 to 7.3 kV • Current draw < 2 nA at breakdown voltage • Testing system breakdown at 8 kV Fowler Duke HEP

  9. Test Results • All plates in modules have passed all electrical tests • All electrical problems have been “self inflicted” • Initial breakdown tests performed at 3kV • Once installed in modules, the tests are at 2.5 kV • Leakage current resolution on Bridgeview program 1 1 A • 10 nA specification can be measured from display on power supply Fowler Duke HEP

  10. Module 2.1 Pad 63 and 64 short Pad 53 trips @ 2 kV Pad 46 trips @ 2 kV Pad 36 trips @ 2.1 kV Module 2.2 Pad 20 and 30 short Module 2.3 Pad 3 to 4 trip @ 2.3 kV Pad 9 to 10 trip @ 1.8 kV Pad 26 and 37 short Pad 60 and 61 short Module 2.4 Pad 15 trips @ 2.3 kV Pad 54 trips @ 2.3 kV Module 2.5 No problems reported Module 2.6 no problems through mechanical assembly Module 2.7 Pad 6 to 7 trip Pad 11 to 12 trip @ 2.5 kV through mechanical assembly High Voltage Testing Results Fowler Duke HEP

  11. Capacitor Choices • The following capacitors were sent to CERN for approval • Johanson 202S43W102KV4E • Size 1812 Voltage 2 kV • Dielectric X7R Capacitance 1000 pF +/- 10 % • AVX 1812GC102KAT1A • Size 1812 Voltage 2 kV • Dielectric X7R Capacitance 1000 pF +/- 10 % • Spectrum Control 1812E102KW302 • Size 1812 Voltage 3 kV • Dielectric BX Capacitance 1000 pF +/- 10 % spec Fowler Duke HEP

  12. Next Steps • Approve capacitor type and source • Order capacitor • lead times for orders are 25 to 40 weeks • Evaluate and approve conformal coating • Determine method to apply conformal coating. • No current supplier offers this option • Design and procure bent pin • Determine attachment method for bent pin Fowler Duke HEP

  13. Concept of Capacitor Assembly Fowler Duke HEP

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