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Reports until 07:47, Friday 05 February 2016
H1 PSL
peter.king@LIGO.ORG - posted 07:47, Friday 05 February 2016 (25404)
PSL diagnostic breadboard scan
This is the first diagnostic breadboard scan conducted since the end of O1.  The last scan was conducted
back on August 10th, 2015.

The power noise looks about the same as before.  Slight decrease in power on the photodiode, which is
not surprising given that alignment may need some tweaking.

Frequency noise: The control signal is now lower from 1-10 Hz.  The noise is lower between 100-1000 Hz.
Slightly higher elsewhere.  Lower than the reference measurement however.  I would say that the frequency
noise is slightly higher now that the NPRO is in its dotage.

Pointing noise: Something is wrong with the measurement.  This might also be an alignment problem, although
nothing wrong was reported by the MEDM screens.  The control signal is off a little.  This might be due to
the PZT mirror mounts not quite coming back to where they were after electrical power was restored.

Mode scan: The number of higher order modes has decreased, which is surprising (to me at least), but the
higher order mode power has increased by about 0.5%.  Which doesn't seem too bad to me.

ISS power noise: The noise on one of the photodetectors (PDA) is slightly higher than before.  The horizontal
beam pointing has increased by just over a factor of 2.  At low frequencies, less than 5 Hz, the beam pointing
noise is worse by a factor of ~5.  This might be due to the re-alignment of the beam onto the quadrant photodiode
inside the ISS photodiode box.

It is good to know that the diagnostic breadboard seems to work, modulo some tweaking, after its O1 hibernation.
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