Today I swapped the glitching ITMy laser for one that has been stabilized in the lab.  This was in response to the ITMy oplev being the winner on several recent DetChar hveto rounds.

To be on the safe side, B. Weaver turned off the oplev pitch damping on the ITMy suspension for the duration of the work.  I began by installing the armored fiber and cooler per ECR E1500408; this new installation is shown in the attached picture.  The laser is powered by the dedicated oplev power supply located in the CER.  This was unplugged when I started the swap, thank you R. McCarthy for getting it working.  I unplugged and removed the old laser, and then installed the armored fiber.  I set the laser power by monitoring the Current Mon port on the back of the laser (uses a voltage to monitor the current being delivered to the laser diode); I set this to 0.885 V, the same setting used in the lab.  The new laser will need 4-6 hours to come to thermal equilibrium in its new home; once this time has passed I will see if any adjustments are needed to the laser power to stop any glitches.  The oplev became un-centered during this effort due to the fiber swap, so I then re-centerd the oplev.  I also had to adjust the whitening gain for the ITMy to get the SUM counts back to same level.  I added 6dB of whitening gain to return the SUM counts to ~31k; T1500556 has been updated to reflect this change.  Finally, Betsy turned the ITMy oplev pitch damping back on.

Old laser was SN 105-1, new laser is SN 189-1.  I will leave WP 6513 open until I have finished any adjustments to the laser power to obtain glitch-free operation.