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- The accelerator provides exactly 910,000 buckets in exactly 0.98 seconds
- The accelerator patterns repeat on this 0.98s interval
- The ratio of these two numbers is what gives rise to the 929kHz (~1MHz) machine rate. Also Equivalently: accelerator rate is 13/14MHz, bucket period is 14/13us.
- timing arrives 100us prior to beam
- The 71428Hz rate is special: common between LCLS1 and LCLS2
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