I attached all the SDFs I accepted and reverted today. Non of these have been committed to the svn yet.

Good work! That did a lot of good in DARM. Attached are spectra in which many narrow lines went 
away or were reduced (comparing 22 hours of FScan SFTs before the change (Apr 18) with 10 hours of
SFTs after the change (Apr 19). We will need to collect much more data to verify that all of the 
degradation that began March 14 has been mitigated, but this first look is very promising - many thanks!

Fig 1: 20-50 Hz 
Fig 2: 50-100 Hz
Fig 3: 100-200 Hz

Attached are post-change spectra using another 15 hours of FScan SFTs since yesterday. Things continue to look good.

Fig 1: 20-50 Hz 
Fig 2: 50-100 Hz
Fig 3: 100-200 Hz

Correction: the date is 18/04/2017 UTC.

Another follow-up with more statistics. The mitigation from turning off
the ethernet adapter continues to be confirmed with greater certainty.
Figures 1-3 show spectra from pre-March 14 (1210 hours), a sample of 
post-March 14 data (242 hours) and post-April 18 (157 hours) 
for 20-50 Hz, 50-100 Hz and 100-200 Hz.

With enough post-April 18 statistics, one can also look more closely at
the difference between pre-March 14 and and post-April 18. Figures 4-6
and 7-9 show such comparisons with different orderings and threrefore
different overlays of the curves. It appears there are lines in the post-April 18
data that are stronger than in the pre-March 14 data and lines in the earlier 
data that are not present in the recent data. Most notably, 1-Hz combs
with +0.25-Hz and 0.50-Hz offsets from integers have disappeared.

Narrow low-frequency lines that are distinctly stronger in recent data include these frequencies:

21.4286 Hz
22.7882 Hz - splitting of 0.0468 Hz
27.4170 Hz 
28.214 Hz 
28.6100 Hz - PEM in O1
31.4127 Hz and 2nd harmonic at  62.8254 Hz
34.1840 Hz
34.909 Hz (absent in earlier data)
41.8833 Hz 
43.409 Hz (absent in earlier data)
43.919 Hz
45.579 Hz
46.9496 Hz
47.6833 Hz
56.9730 Hz
57.5889 Hz
66.7502 Hz (part of 1 Hz comb in O1)
68.3677 Hz
79.763 Hz
83.315 Hz
83.335 Hz
85.7139 Hz
85.8298 Hz
88.8895 Hz
91.158 Hz
93.8995 Hz
95.995 Hz (absent in earlier data)
107.1182 Hz 
114.000 Hz (absent in earlier data)

Narrow low-frequency lines in the earlier data that no longer appear include these frequencies:

20.25 Hz - 50.25 Hz (1-Hz comb wiped out!)
24.50 Hz - 62.50 Hz (1-Hz comb wiped out!)
29.1957 Hz 
29.969 Hz


Note that I'm not claiming change points occurred  for the above lines on March 14 (as I did for the
original set of lines flagged) or on April 18. I'm merely noting a difference in average line strengths 
before March 14 vs after April 18. Change points could have occurred between March 14 and April 18,
shortly before March 14 or shortly after April 18. 

To pin down better when the two 1-Hz combs disappeared from DARM,
I checked Ansel's handy-dandy comb tracker and found the answer immediately.

The two attached figures (screen grabs) show the summed power in the teeth of those combs.
The 0.5-Hz offset comb is elevated before March 14, jumps up after March 14
and drops down to normal after April 18. The 0.25-Hz offset comb is highly
elevated before March 14, jumps way up after March 14 and drops down to normal
after April 18.

These plots raise the interesting question of what was done on April 18 that
went beyond the mitigation of the problems triggered on March 14. 

Figure 1 - Strength of 1-Hz comb (0.5-Hz offset) vs time (March 14 is day 547 after 9/15/2014, April 18 is day 582)

Figure 2 - Strength of 1-Hz comb (0.25-Hz offset) vs time 

[Jenne, Vaishali, Karl, Betsy]

Koji pointed out to me that even though the new black glass beam dump had been sitting on a HEPA table at the 40m, since it has been so long since it was cleaned, it could accumulate a bit of dust or film. 

So, we temporarily put the razor dump back, disassembled the black glass dump, and with Betsy's guidance cleaned the surfaces of the black glass with first contact.  We then reassembled the dump and put it back on the table. 

Taking advantage of a few minutes while those working on the cleanroom took a short break, we transitioned to laser hazard so that we could do a fine alignment of the beam dump with the DRMI flashing.  The LVEA was transitioned back to laser safe after this brief work was completed, so that the cleanroom team could work more easily.

This was h1calcs model change was covered under the continued work described in
WP #6572
ECR E1700121
II 7828

This restart was to incorporate a few more EPICs monitor channels (24 or so) to support commissioning of the new SRC Detuning Infrastructure (see LHO aLOG 35547). In addition, I moved the pick-offs for calculated time-dependent correction factors that feed into the next subsequent calculations upstream of the final-answer 128 [sec] low pass. No change was made to the functionality of the infrastructure for h(t), these are all control-room only used redundant infrastructure. 

The changes to the h1calcs model is actually just changes to common library parts, which have been committed to the userapps repo:
/opt/rtcds/userapps/release/cal/common/models/
    CAL_CS_MASTER.mdl
    CAL_LINE_MONITOR_MASTER.mdl

These EPICs channels have been added to the various MEDM screens, and those screens have been committed to the userapps repo under
/opt/rtcds/userapps/release/cal/common/medm/
   CAL_CS_TDEP_F_C_OVERVIEW.adl
   CAL_CS_TDEP_F_S_OVERVIEW.adl
   CAL_CS_TDEP_KAPPA_PU_OVERVIEW.adl
   CAL_CS_TDEP_KAPPA_TST_OVERVIEW.adl
   CAL_CS_TDEP_OVERVIEW.adl

Initial results (i.e. the 30 minute NLN lock we just had) indicate that moving the pick-offs that pass one answer to the next calculation upstream of their 128 sec low-pass has cleaned up the final answers. Plots to come when we have more data.

Measure ASC sensing matrix, including POP WFS. (Should be quick - amplitudes all tuned already)

Now that we've got infrastructure in place for tracking SRC detuning parameters live, I'd like to repeat Evan Hall's study from LHO aLOG 27675, putting offsets into the SRCL loop and see if the infrastructure / parameters track the change in detuning as that has been confirmed to do. 

I request 30 minutes of full, NLN IFO time.

Here is a link to a Vertex scan taken a few months ago:  https://alog.ligo-wa.caltech.edu/aLOG/uploads/29517_20160907141626_09062016_Vertex_SEM1500_analog.pdf  Note: the apparent amplitude discrepancies are due to differing multiplier voltage settings.  As such these two scans are for qualitative comparisons only.

I replaced the burned-out incandescent lamp with an upgraded LED version (Data Display Products, miniature, wedge-base 24-28VAC white WB200-FW4K28HD)

I de-energized Kobelco and valved out water to QDP80. Tomorrow during commissioning I will enter LVEA and de-energize turbo stations.

Maintenance Update as of19:00UTC:

• 18:45 - Kyle back from EY, into LVEA, now done
• 18:49 - DaveB back from EX
• 18:54 - DaveB, HWS code ready to start
• 19:00 - Greg, DMT code being backed out

• 19:22 - Robert and Evan to EY and EX, hunting noise that started two weeks ago
• 19:22 - Greg, DMT reverted to previous code, call if any issues found