J. Oberling, P. King

Spent today installing and testing the new HPO water manifold.  The mainfold is now installed and the valves for the MOPA, PWR, and Laser Head water circuits are set to provide the proper flow rates.  While we were doing this we figured it was a good idea to implement ECR E1500408; this ECR is for installing valve on the outlet side of the Laser Crystal water circuit.  This is now also complete.  A picture of the new water manifold and valve is attached.  This completes this ECR.

Once everything was installed and verified that it wasn't leaking, We noticed the flow sensor for laser head #1 (part of the Laser Head water circuit) had stopped reading.  Opening up the HPO box we saw that the turbine was not spinning.  We drained the circuit and removed and replaced the flow sensor.  Before installing the new flow sensor, Peter found an ~1/2" piece of black plastic (looked like a piece leftover from cutting the threads on the main water manifold.  Recall we pulled out a bunch of these yesterday while prepping the new manifold.) sitting in the output side of the flow sensor (in the small black manifold that sits above the HPO resonator cavity).  We installed the new flow sensor, turned on the chillers, and watched for leaks.  After several minutes no leaks were observed, so we left the crystal chiller running overnight to test the system (the diode chiller is still OFF).  The HPO and FE lasers are both OFF.  Will continue in the morning.