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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.  Equivalently: accelerator rate is 13/14MHz, bucket period is 14/13us.
• timing arrives 100us eventcodes arrive ~100us prior to beam
• The 71428Hz rate is special: common between LCLS1 and LCLS2

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