P. King, J. Oberling

Peter worked to recover the PMC, FSS, and ISS this morning.  For details, see his alog here.

After Peter was finished, I re-installed the MOPA lid and the FE power monitor pick-off; I then worked on aligning the pick-off, finishing in the afternoon.  The power out of the FE was measured using the roving 300W power meter to be 33.6W; I calibrated the pick-off to this value.  At this point I noticed something strange.  The output of the pick-off takes a long time (10s of minutes) to settle down and level off; the power reading on the power meter did not change during this "warm up" period.  I don't remember it doing this upon first installation, so this is something to keep an eye on.  After a lengthy warm-up period I checked the pick-off to make sure it wasn't getting hot (an indication of the pick-off being misaligned) and it was cool to the touch.  With the pick-off installed, a slight realignment into the 70W amp was required.  Most of the alignment was off in pitch, which holds together with the first time we installed this pick-off.  Upon realignment the output of the 70W amplifier was 75.8W; I re-calibrated the 70W power monitor PD to this value.

I then proceeded to reinstall the ISS AOM.  Using low power, I roughly aligned the AOM to the beam using the aperture in the AOM cover.  This done, I looked for a diffracted beam, but couldn't find one.  In addition, the beam on the AOM looks much larger than I remember it being.  Not wanting to damage anything when we're so close to having the beam back, I stopped here for the day.  So the only things left to do before the PSL is ready is to align the ISS AOM and close the ISS loop.  I left the FE and 70W amplifier OFF overnight.