I changed up a few things such as:

• Catches TypeErrors caused by model restarts. I am nervous that this may catch more than I want, so I also added...
• Any error will email me with details. Often times I never even find out that there was a problem until it becomes a bigger one.
• Minor modifications to a few tests .
• Added a test for the PSL AC.
• Changed the way it gets a Guardian node list. I used to have it call "guardctrl nodes" but this would not work on the alarm computer due to different versions of Bash, plus it is just a really clunky way getting that list. Now it just calls a function from the guardctrl client code to get the list directly.

If there is any problem with this version, please don't hesitate to go back one revision.

Attached are plots of the transfer functions measured this morning.  The input modecleaner
was disabled whilst these measurements were obtained.

    Note the frequency servo schematic is D040105

C20F22-1.tif: common gain = 20 dB, fast gain = 22 dB
C20F16-1.tif: common gain = 20 dB, fast gain = 16 dB

C20F22FastMon.jpg: transfer function measured at TP10
C20F22PCMon.jpg: transfer function measured at TP9
C20F22TP8.jpg: transfer function measured at TP8 (should be 10X greater than TP9 measurement)
               common gain = 20 dB, fast gain = 22 dB

C16F22TP8.jpg: transfer function measured at TP8, common gain = 20 dB, fast gain = 22 dB
C16F22TP9.jpg: transfer function measured at TP9, common gain = 20 dB, fast gain = 22 dB

C20F16TP9.jpg: transfer function measured at TP9, common gain = 20 dB, fast gain = 16 dB
C20F16TP8.jpg: transfer function measured at TP8, common gain = 20 dB, fast gain = 16 dB

C20F16TP3Spectrum.jpg: noise measured at TP3 (the mixer monitor, or error point)
                       common gain = 20 dB, fast gain = 16 dB
C20F22TP3Spectrum.jpg: noise measured at TP3, common gain = 20 dB, fast gain = 22 dB

CrossoverSpectrum.jpg: has the two noise spectra overlapped for a visual comparison.

The smoothing factor was set to 0.999 on all CPs. To confirm that the device is still active and responding and not in an "inactive state" (which happens if smoothing factor is set to its limit of 1.0), the LLCV trends over 30 days are posted for the seven CPs (CP3 excluded).

The smoothing factor algorithm (from EPICS integrated into Beckhoff):

if SMOO is 0 or INIT is True, VAL = val
else VAL = val * (1 - SMOO) + Previous_vale * SMOO

*this implements a first-order infinite impulse response (IIR) digital filter with z-plane pole at tau=-T/ln(SMOO), where T is the time between record processing

Attached are screenshots for the past 7 days of optical lever trends for PIT, YAW, and SUM.

This completes FAMIS request 4683.

Peter was in the PSL enclosure and looking at the FSS - his alog will give details.

He's done so I'm starting to lock.

Attached is a plot of the diffracted power versus offset slider position.
With the current slider setting of 6.35, we are diffracting around 3 W of
light.  Even if the output power of the laser was only 100 W, this would
be 3% not the indicated ~15%.  However we know the output power of the laser
is greater than 100 W, so obviously the percent diffracted light is even less
than 3%.

   This is noticeably less than when the ISS was last tuned up.  Back then a
slider setting of 6.35 would diffract about 7 W.  Although nothing has changed
hardware-wise, it is possible that the 80 MHz source for the ISS AOM is no
longer providing the ~32 dBm, or the AOM driver is deteriorating.




Jason/Peter

With the pre-modecleaner unlocked the output of the locking photodiode was between
-1.070 V and -1.080 v.  Locked was between -170 mV and -185 mV.  This gives the
pre-modecleaner visibility to be between 83% and 84%.


Jason/Peter

This is as far as I have been able to get the IFO tonight. I tried to set the intent bit, but it will not engage. I have set the Ops Observatory Mode to Observing.

Took advantage of laser being down (aLOG #28142 & 28145) to change the water filters in the chiller room. 
Swapped out the Diode Chiller filter. The filter looked fine, but changed it out anyway to see if this had any effect on the rising PSL chiller pressures. 
Did not change the Chrystal Chiller filter. The filter bracket is poorly mounted to the wall and is coming loose. Need to secure the filter bracket to the wall before unscrewing the filter canister.