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Test of moving the HV Board

Test of moving the HV Board. Marco, John, Bill G., Bill T.,Howard. Test Setup. HV board moved to a box HV input and cable output. TDR test. Typical TDR picture Need to digitize distorted picture Use computer software to pick out points 50 Ω 29.5 pF/ft 0.070 µ H/ft

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Test of moving the HV Board

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  1. Test of moving the HV Board Marco, John, Bill G., Bill T.,Howard HM

  2. Test Setup • HV board moved to a box • HV input and cable output HM

  3. TDR test • Typical TDR picture • Need to digitize distorted picture • Use computer software to pick out points • 50 Ω • 29.5 pF/ft • 0.070 µH/ft • nominal delay 1.46 ns/ft. HM

  4. TDR Photos HM

  5. Raw versus Extension Raw Chamber Q1 Can see structures in the circuit board HM

  6. Method of Analysis HM

  7. Fit Curve to an Exponential • Good fit to an exponential • RC = 5.0357 ns HM

  8. Summary of Results HM

  9. Move to ALS • Detector in the beam line • Cables outside • Chamber just worked • Used it to tune the beam HM

  10. ALS averaged pulse • Chamber at 1 ATM • 400 V • “High Intensity” • Four channels HM

  11. Low Intensity HM

  12. Rise Time Measurement • Not sure how scope calculates rise time • Is extra 1 ns due to • longer cables? • physics? • way measurement done? HM

  13. Investigate Shorter Cable • Move a scope into beam line • Scope few feet away • Measure waveform • Add a 20 ns cable • Tried to measure rad hard cable • Attempted quick cable replacement • Too stiff • Broke connections HM

  14. Many Waveforms - Different Intensity HM

  15. Expanded Picture HM

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