J. Oberling, J. Bartlett, R. Schofield

We went in to the PSL today and swapped the old cable crossover that was overflowing with a larger one, see attached picture.  The installation is not complete, the 2nd section was too long so we need to cut it.  If anyone goes into the PSL, if you need to walk across the crossover, please do not walk over the exposed cables.

While in there, we took a look at the known slow leak in the PSL cooling manifold.  Unfortunately there's nothing we can do about it in-situ; a fix will mean pulling the manifold out, which has caused us problems in the past.  Since the leak is very slow and we are working on a new manifold design, we will leave it as is for the time being.

Since we have also been seeing air bubbles in the system (seen in the fill port of the crystal chiller, most recently reported by Sheila here) we bled the system at the filter canister under the PSL table.  This initially tripped the laser (bled too much, chiller got low and shut off), so we then recruited Cheryl to fill the chiller in the chiller room as Jeff bled the system in the enclosure.  A good bit of air was let out of the system; Robert will do some analysis to see if this has improved things.

When bringing the laser back up, the PMC was having a hard time locking.  This turned out to be due to a small shift in the beam alignment into the PMC.  Best guess at this point as to why the alignment shifted is that we were in the PSL long enough for the AC to lower the ambient temperature enough to cause this shift.  I did a small tweak to the beam alignment into the PMC and everything locked up again without issue.