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Main Injector & Recycler DCCT

Main Injector & Recycler DCCT. SHUTDOWN SUMMARY MI DCCT Pickup Modifications. Feedback loop NOW has 2 turns instead of 1. Calibration loop NOW has 2 turns instead of 1. A single turn calibration loop is available, but not connected.

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Main Injector & Recycler DCCT

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  1. Main Injector & Recycler DCCT

  2. SHUTDOWN SUMMARY MI DCCT Pickup Modifications • Feedback loop NOW has 2 turns instead of 1. • Calibration loop NOW has 2 turns instead of 1. A single turn calibration loop is available, but not connected. • The dynamic range of the intensity reading is extended to 1.4A (9.8e13) with output readings remaining linear <4.5e13. • At 5e13, errors are <0.1%; at full-scale, errors approach 0.5%.

  3. AC Sense DC Sense 2turn cal Drive 1 4turn fdbk Drive 2 2turn fdbk Feedback 1 (2 turn) Feedback2 (2turn)

  4. MI PROBLEMS @STARTUP WORK: • Tuned resistors feedback loop to reduce slow oscillation • Align pickup signal with demodulator clock signal • Tuned DC_SENSE board 200Hz,600Hz notch filters • Reduced gain at demodulator input by 1/2

  5. 10/24 vs. 10/25 200Hz noise reduced from 0.21e10rms (last year ~0.17e10rms) to 0.085e10rms.

  6. CONDITION prior to access

  7. 11/6/2007 ACCESS SUMMARY MI DCCT Modifications • Changed feedback burden resistor from 15Ω to 20Ω, decreasing dynamic range to1.05A (7.3e13). • Moved front end input to a buffer amplifier channel with a 500Hz LPF & 200Hz notch filter. (500HzLPF only channel still available in buffer amplifier) • Reduces 200Hz noise; Increase rise time from ~500usec to ~3msec; Bench shows ~1% overshoot • Calibration and frequency response tests

  8. Wobble was not due to 200Hz noise as before. MI Ramp was affecting DCCT readout. MI Wobble@ Startup

  9. Also, Bad adapter to input filter BEFORE

  10. After removing bad adapter… Effect of MI Ramp Signal Frequency Content

  11. VME front end got reset to previous value so did not take into account feedback resistor 15/20 change. 20% difference in MI // RR transfer

  12. FINAL CONDITION

  13. SHUTDOWN SUMMARYRR Bergoz NPCT Installation

  14. SHUTDOWN SUMMARYRR Bergoz NPCT Installation (2)

  15. Bergoz Performance During Bake • Measured -0.067 e10/degC • Expected 0.035 e10/degC (5uA/degK)

  16. 11/6/2007 ACCESS SUMMARY RR DCCT Modifications • Moved front end input to a buffer amplifier channel with a 500Hz LPF & 200Hz notch filter. (500Hz+200&600Hz notch filtered channel still available in buffer amplifier)\ • Calibration and frequency response tests

  17. Observed Effect of MI Ramp

  18. RR Bunch Length Dependence

  19. Linear Sweep Frequency at RR Calibration Port

  20. R:BCBEAM to filter out 60Hz

  21. Old Bergoz Unit Failing

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