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Test of moving the HV Board

A comprehensive overview of the test setup and analysis conducted on the HV board for ALS research, including TDR testing, curve fitting, move to ALS facility, pulse averaging, rise time measurement, cable investigation, and waveform analysis.

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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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