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Plans for Test Stand TBT Testing

Plans for Test Stand TBT Testing. Examine different bandwidth and gain configurations for TBT. Optimize for single bunch. Examine settings for uncoalesced beam. Test timing consistency of first turn of TBT trigger. Raw Data from A3 System During Store. Raw Beam Signal vs Fake Beam.

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Plans for Test Stand TBT Testing

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  1. Plans for Test Stand TBT Testing • Examine different bandwidth and gain configurations for TBT. Optimize for single bunch. • Examine settings for uncoalesced beam. • Test timing consistency of first turn of TBT trigger.

  2. Raw Data from A3 System During Store

  3. Raw Beam Signal vs Fake Beam

  4. TBT Raw Data Conclusions • Beam signal rings filter for at most 16 samples of data. • Fake beam signal rings much longer due to electrical bounce on the trigger generator. • Minimum Greychip decimation is 16 samples. • Set Greychip for minimum decimation.

  5. New Delay for 53 MHz Ensemble Settings

  6. Greychip Gain Block Diagram CFIR & PFIR CIC Filter Digitizer Data Coarse Gain Output Scale NCO

  7. Test Stand Ensemble Output for Different Shift Settings

  8. Shift 5 TBT Study

  9. Shift 6 TBT Study

  10. Coarse 2 TBT Study

  11. Coarse 3 TBT Study

  12. Gain Study Conclusions • Shift saturates after a setting of 6 bit shift. • Six bit shift shows irregularities in TBT data. • Same irregularities seen when changing coarse gain settings. • Saturation is downstream of CIC (CFIR or PFIR?) • Maximize gain in front of CIC. Reduce gain upstream for best frontend dynamic range.

  13. TBT Final Settings

  14. New Settings with Multiple Bunches

  15. New Settings Looking at Beam (36x36)

  16. First Look at Uncoalesced Beam

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