The laser has been shutting down several times per day after restoring the interlock functionality following the cooling line work earlier in the week.

This is due to short flow dropouts reported by the flow meters either due to bubbles working their way out of the system, or due to running the flow sensors too close to the minimum flow they can reliably report.

We are in the process of comparing performance with LLO and investigating workarounds in both chiller line hardware and Beckhoff software.

Attached are a few trends of the flow rates, with the first being over the last 5 days.  As can be seen the flow meter drop outs became much worse after Tuesday's reduction in flow.

The 2nd attachment is a 60 day trend and the 3rd attachment is a 180 day trend.  Both show that flow meter drop outs have been rather uncommon over the last 6 months.  At this point this seems consistent with air bubbles working their way out of the system due to the recent plumbing work.  If the drop outs don't reduce in frequency then we may have to increase the flows slightly to move them further away from the flow meter's minimum measurable flow.