Back to Observing Mode @ 6:07 UTC after an initial alignment.  I briefly went to Observing @ 6:02 UTC, but noticed that the RF45 was running away again.  Went out of Observing and adjusted RF45 back to 22.2dB (from 23.2dB that was reset sometime during lockloss and alignment).

Full report can be found here. Some highlights:

• Nice long locks; ~80% duty cycle; only* four lock losses.
  • *Came out of observing a few times: for maintenance, commissioning, HW injections.
• RF45 AM issues abound.
• Started to notice ~10Hz seismic activity starting around 12:00:00 UTC on weekdays.
• Prior known glitch classes that we still see:
  • ~<50Hz glitches at EX (air compressor)
  • ~hourly 60Hz glitches at EY (actually every 76 minutes)
  • Glitches formerly known as dust glitches / glitches associated with ETMY saturations
  • 300-400Hz band of glitchyness (suspected to be caused by periscope motion?)

(sorry I forgot to post to alog earlier)

Lockloss @ 5:06 UTC.  No obvious cause as seismic and wind are calm.  Coincided with ITMx saturation.

Nothing of note here.  H1 is in Observing and running smooth and steady for 7 hours now.  4 ETMy saturation alarms since the start of the shift.  RF45 is looking good. 

In case it is ever of use, I asked Christina and Terry G. to try and log the arrival and departure times of delivery vehicles for two weeks. UPS and FedEx do daily deliveries: various other vendors deliver occasionally. If necessary, we can make inquiries as to Gross Vehicle Weight etc. 

Attached is a snapshot illustrating which observe mode segment had the ASC DHARD Yaw FM2 filter engaged.  Recall that the filter was engaged a few times over the last week in an attempt to ride out a species of ground motion.  In all but one of the cases when this FM2 filter was engaged, the IFO Observation Intent bit was NOT set.  The following is the one segment when the filter was engaged:

H1 Single IFO Segment  #30 from https://ldas-jobs.ligo.caltech.edu/~detchar/summary/O1/

(Segment lists are shown via the blue pop-open banners across the bottom of the page - see specifically H1:DMT-ANALYSIS_READY:1)

30	1127313107	1127329701	16594

TITLE: 09/28 [DAY Shift]: 15:00-23:00 UTC (08:00-16:00 PDT), all times posted in UTC

STATE Of H1: Observing at ~70 Mpc.

SUPPORT: Peter, Mike, Laura

QUICK SUMMARY: Reducing RF45 modulation index definitely helps with the glitch rate. Lockloss twice within the shift due to an earthquake and PSL tripped. Had no problem relocking. Wind speed ~10mph tilts the ground and increase the seismic activity in the earthquake band (0.03-0.1Hz) to 0.05 um/s.

INCOMING OPERATOR: Travis

ACTIVITY LOG:

Morning Meeting:

- We have had good weekend locking, but not a good running. Driver swap tomorrow.

15:51 Lockloss due to an earthquake. Adjusted PR3 to maximize COMM beatnote. Touched BS to get DRMI locked at the right mode.

16:27 Back to Observing.

17:37 RF45 was acting up. Dropped the intent bit to reduce RF45 mod index. Kept the configuration as Laura suggested and continued to Observe.

18:12 Lockloss due to PSL tripped. Peter turning the laser back on.

           Praxxair on site. Going to Mid Y. Intent bit dropped.

18:20 Peter back

18:46 Locked again at NOMINAL_LOW_NOISE but not Observing. Waiting for Praxxair to leave site.

19:49 Praxxair hasn't moved for a really long time. I switched the bit to Observing.

19:51 Out of Observing. Praxxair leaving site.

19:56 Back to Observing.    

Parameters for report:

GPS Start Time = 1127423695 # Beginning of time span, in GPS seconds, to search for injections
GPS End Time = 1127510095 # Ending of time span, in GPS seconds, to search for injections
Check Hanford IFO = True # Check for injections in the Hanford IFO frame files.
Check Livingston IFO = True # Check for injections in the Livingston IFO frame files.
IFO Coinc Time = 0.01 # Time window, in seconds, for coincidence between IFO injection events.
Check ODC_HOFT = True # Check ODC-MASTER_CHANNEL_OUT_DQ channel in HOFT frames.
Check ODC_RAW = True # Check ODC-MASTER_CHANNEL_OUT_DQ channel in RAW frames.
Check ODC_RDS = True # Check ODC-MASTER_CHANNEL_OUT_DQ channel in RDS frames.
Check GDS_HOFT = True # Check GDS-CALIB_STATE_VECTOR channel in HOFT frames.
Report Normal = True # Include normal (IFO-coincident, consistent, and scheduled for network injections and consistent and scheduled for IFO injections) injections in report
Report Anomalous = True # Include anomalous (non-IFO-coincident, inconsistent, or unscheduled) injections in report

----

No scheduled injections or non-occurring injections were found.

There was a CAL_INJ reset that occurred only in H1, CALRESET 1127480460.000 (H1). However, it has the anomaly that it appears in ODC HOFT and GDS HOFT frames but not in ODC RAW or ODC RDS frames.  This same anomaly was observed with several CBC injections in L1 during the daily period 1127163296 - 1127249696.

B. Weaver, J. Oberling

After this morning's PSL trip there was a 0.5W increase in IMC-PWR_IN, observed ~15 minutes after reaching NOMINAL_LOW_NOISE.  We started digging in the Guardian code and rediscoverd that the ISS diffracted power gets adjusted by a software PID loop located in the IMC_LOCK guardian; this adjustment is done via changing the ISS 2nd loop reference signal.  At the start of a lock stretch this PID loop is necessary to keep the ISS diffracted power around the predetermined nominal value of 8%.  However today we witnessed that when the diffracted power trended towards the upper threshold (set in the IMC_LOCK guardian code) of 10%, the IMC_LOCK turned on the PID loop, thus increasing the measured IMC-PWR_IN by ~0.5W.

Fil came to let me know that the alarm at Hanford site is going off. They called earlier that there will be an alert system testing between 12:30-13:30.

I switched to Observing a bit at 19:49 after Praxxair hadn't moved for a really long time. I went back to comissioning then the truck took off from Mid Y at 19:51. And back to Observing when it went back to Rt. 10.

The PSL AOM diffracted power was dropping but now stable within desired range (8%). Peter went to turn on the laser Watchdog.

Downloaded Dunca's M.'s new ODC overview screens. They are now linked to the sitemap. The old one are still available.
cds/h1/medm/SITEMAP.adl is in the svn - revision 11744
For what it's worth - I also noticed that some ODC settings for IM's and HTTS's are not up to date.

PSL tripped.

Executive summary: 

 In regard to narrow lines, early O1 data resembles early ER8 data: a pervasive 16-Hz comb persists throughout the CW search band (below 2000 Hz); there is a notable 1-Hz comb below 100 Hz (0.5-Hz offset); and other sporadic combs persist.
 On the other hand, there are distinct improvements: noise floor is cleaner nearly everywhere and substantially lower in the 10-70 Hz band; non-linear upconversion around quad violin modes and harmonics is much reduced; some combs and isolated lines have disappeared; and the OMC alignment dither frequencies have moved out of the CW search band (hurray!).
 Oh the third hand, new artifacts have appeared or strengthened: a sporadic 8-Hz comb suspected before is confirmed; a 1-Hz comb (no offset) has emerged below 70 Hz; a broad bulge appears in the 1240-1270 Hz band.


Details: 

Using 104.5 hours of FScan-generated, Hann-windowed, 30-minute SFTs, I have gone through the first 2000 Hz of the DARM displacement spectrum (CW search band) to identify lines that could contaminate CW searches.
This study is very similar to prior studies of ER7 data and ER8 data, but since this is my first O1 report, I will repeat below some earlier findings.

Some sample displacement amplitude spectra are attached directly below, but more extensive sets of spectra are attached in zipped files. One set is for O1 sub-band spectra with labels (see code below), and one set is an overlay of early ER8 spectra (50 hours) and the early O1 spectra. As usual, the spectra look worse than they really are because single-bin lines (0.5 mHz wide) appear disproportionately wide in the graphics

A flat-file line list is attached with the same alphabetic coding as in the figures.

Findings:

 A 16-Hz comb pervades the entire 0-2000 Hz band (and well beyond, based on daily FScans)
 A typically much weaker and sporadic 8-Hz comb (odd harmonics) is also pervasive - previously suspected, now confirmed (all harmonics are labeled in figures, even when not visible)
 A 1-Hz comb with a 0.5-Hz offset is visible from 15.5 Hz to 78.5 Hz (slightly wider span than before)
 A new 1-Hz with zero offset is visible from 20.0 Hz to 68.0 Hz
 A 99.9989-Hz comb is visible to its 8th harmonic (was previously visible to its 13th harmonic)
 The 60-Hz power mains comb is visible to its 5th harmonic (was previously visible to its 9th harmonic)
 There is a sporadic comb-on-comb with 0.088425-Hz fine spacing that appears with limited spans in three places near harmonics of 77, 154 and 231 Hz (ambiguity in precise fundamental frequency)
 There is a 31.4149-Hz comb visible to its 2nd harmonic
 The OMC alignment dithers have been moved to above 2000 Hz (thanks!)
 Upconversion around the quad violin modes and their harmonics is much reduced, although the strengths of the higher harmonics themselves remain high. To be more specific, the fundamental and higher harmonics of the upconversion itself (integer harmonics) due to the fundamental violin harmonics are highly suppressed, while the higher harmonics of the violin modes themselves  (not integer harmonics)  remain high. 
 A number of previously seen combs are no longer apparent:  59.3155 Hz, 59.9392 Hz, 59.9954 Hz and 75.3 Hz
 A variety of single lines have disappeared, and new ones have appeared (see attached line list) 
 Compared to early ER8 data, the noise floor is slightly lower in most of the band and significantly lower in the 10-70 Hz band, but there is a significant new bulge in the 1240-1270 Hz band


Line label codes in figures:

b - Bounce mode (quad suspension)
r - Roll mode (quad suspension)
Q - Quad violin mode and harmonics
B - Beam splitter violin mode and harmonics
C - Calibration lines
M - Power mains (60 HZ)
s - 16-Hz comb
e - 8-Hz comb (odd harmonics)
O - 1-Hz comb (0.5-Hz offset)
o - 1-Hz comb (zero offset)
H - 99.9989-Hz comb
J - 31.4149-Hz comb
K - 0.088425-Hz comb
x - single line

Figure 1 - 0-2000 Hz (Early O1 data with line labels)
Figure 2 - 20-100 Hz sub-band (shows complexity of combs below ~70 Hz
Figure 3 - 1300-1400 Hz sub-band (shows how clean the noise floor is away from 8-Hz, 16-Hz lines at high frequencies
Figure 4 - 0-2000 Hz (Early ER8 and O1 data comparison, no labels)

Attachments:
* Zip file with miscellaneous sub-band spectra for early O1 data (with line labels)
* Zip file with sub-band spectra comparing early ER8 and early O1 data
* Flat-file list of lines marked on figures