J. Oberling, R. Short

Robert requested that we lower the PSL chiller flow rate in an attempt to lower the vibration on the PSL table.  Ryan and I did this at ~17:02 UTC (10:02 PDT); we lowered the flow by slightly adjusting the chiller's internal bypass, it changed from ~3.2 lpm to ~2.6 lpm (roughly half-way between our old operating flow and our observed minimum).  The laser was fine with this change; we did see an expected slow increase in the water temperature and in the Amp/DB temperature.  We are monitoring the PSL as it thermalizes with this new cooling flow rate and will update if anything adverse occurs (we will keep a close eye on air bubbles).  I am leaving WP 11209 open for now as we may need to adjust the flow rate again, depending on what Robert finds with this first change.