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EVR Delays

These numbers represent the delay, in microseconds, between the leading edge of a 120Hz pulse and the leading edge of the trigger pulse sent to the pulse picker spindle in order to "catch" the next pulse.

Timing Measurements

Measured on 2014-07-09 with reflaser and photodiode in XCS, using ioc/common/pulsepicker/R1.0.0 and firmware revision Ns=96.

  • Flip-Flop mode: 8.6ms from pulse picker trigger to center open position. Open time is 4.4ms.
  • Burst/Follower mode: 6.6ms from pulse picker trigger to first light (open); 4.9ms from pulse picker trigger to last light (close).

This means that nominal EVR delays are:

  • Flip-Flop mode:
    • 0ns (or minimum TDES) for aggressive timing (very next FEL pulse)
    • 8000us for conservative timing (skip one FEL pulse, capture the one after that)
  • Burst/Follower mode:
    • 0ns (or minimum TDES) for aggressive timing (very next FEL pulse)
    • 5000us for conservative timing (skip one FEL pulse, allow/block the one after that)

MEC

  • Flip-Flop (nShots=1) (Closed-to-Closed): 8100
  • Burst (Closed-to-Open): ?

XCS (last updated 2014-07-09)

  • Flip-Flop (nShots=1) (Closed-to-Closed): 8100 7500 8000 (aggressive: 0)
  • Burst (Closed-to-Open): 5000 (aggressive: 0)

Times dialed using reflaser2 and Thorlabs photodiode.

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