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Reports until 08:01, Sunday 18 October 2015
LHO General
patrick.thomas@LIGO.ORG - posted 08:01, Sunday 18 October 2015 (22615)
Ops Day Beginning Shift Summary
TITLE: 10/18 [DAY Shift]: 15:00-23:00 UTC (08:00-16:00 PDT), all times posted in UTC
STATE Of H1: Observing @ ~ 77 MPc.
OUTGOING OPERATOR: Nutsinee
QUICK SUMMARY: From the cameras the lights are off in the LVEA, PSL enclosure, end X, end Y and mid X. I can not tell if they are off at mid Y. Seismic in 0.03 - 0.1 Hz band is around .02 um/s. Seismic in 0.1 - 0.3 Hz band is around .2 um/s and has been trending up. Winds are less than 10 mph.
H1 General
nutsinee.kijbunchoo@LIGO.ORG - posted 04:41, Sunday 18 October 2015 (22613)
Owl Mid Shift Summary

Still observing at ~76 Mpc. We had one GRB alert at 09:36:44 UTC but LLO was (and is) still down. I contacted LLO and they have received the alert as well but didn't sound like they could get the ifo up anytime soon. Microseism slowly increasing. Seismic activity in EQ band is nominal. Wind speed ~10mph. 

H1 General
nutsinee.kijbunchoo@LIGO.ORG - posted 00:09, Sunday 18 October 2015 (22612)
Owl Shift Transition

TITLE: Oct 18 OWL Shift 07:00-15:00UTC (00:00-08:00 PDT), all times posted in UTC

STATE Of H1: Observing at ~78Mpc

OUTGOING OPERATOR: Ed

QUICK SUMMARY: The ifo has been locked 9 hours. Nominal seismic activity. Wind below 10mph. LLO is still down.

H1 General
edmond.merilh@LIGO.ORG - posted 23:58, Saturday 17 October 2015 (22611)
Shift Summary - Evening

TITLE: Oct 17 EVE Shift 23:00-07:00UTC (16:00-00:00 PDT), all times posted in UTC

STATE Of H1: Observing

LOCK DURATION: ~8hr50min

INCOMING OPERATOR: Nutsinee

ACTIVITY LOG:

23:05 Chris left the site

23:06 Jordan arrived on site

04:06 Wind is picking up to ~20mph. Loss of range is about 5Mpc on the hour . 75Mpc

05:35 Wind is dying back to ≤ 10mph range has returned to 80Mpc

SHIFT SUMMARY: IFO locked for my entire shift. Wind speeds rose for about 2 hours and it took a few Mpcs off the range but the range returned after wind died back. Range 76Mpc

SUS E_T_M_Y saturating (Oct 17 23:06:12 UTC)

SUS E_T_M_Y saturating (Oct 17 23:06:13 UTC)

SUS E_T_M_Y saturating (Oct 18 23:20:02 UTC)

SUS E_T_M_Y saturating (Oct 18 23:23:28 UTC)

SUS E_T_M_Y saturating (Oct 17 23:39:27 UTC)

SUS E_T_M_Y saturating (Oct 17 23:54:12 UTC)

SUS E_T_M_Y saturating (Oct 18 02:56:08 UTC)

SUS E_T_M_Y saturating (Oct 18 03:20:42 UTC)

SUS E_T_M_Y saturating (Oct 18 05:46:47 UTC)

H1 General
edmond.merilh@LIGO.ORG - posted 20:31, Saturday 17 October 2015 (22610)
Mid-Shift Summary - Evening

MID-SHIFT SUMMARY:

Nothing out of the ordinary to report. Wind is calm. Sei and µSei is calm. A few ETMY saturations. Locked now for 5hr21min. @ 78.8Mpc. From what I can tell Livingston is down and in "Maintenance" Observatory Mode. I haven't seen them up once during my shift.

H1 General
edmond.merilh@LIGO.ORG - posted 16:04, Saturday 17 October 2015 (22609)
Shift Summary - Evening Transition

TITLE: Oct 17 EVE Shift 23:00-07:00UTC (16:00-00:00 PDT), all times posted in UTC

STATE Of H1: Observing

OUTGOING OPERATOR: Patrick

QUICK SUMMARY:IFO in Observing mode ~80 Mpc. All lights in LVEA, PSL and M/E stations are off. Wind is ≤10mph. EQ sei plot is back to nominal after quake that caused most recent lockloss. Microseism plot is steady at ~.1microns/s. CW injections are running. Calibration lines are on.

LHO General
patrick.thomas@LIGO.ORG - posted 16:00, Saturday 17 October 2015 (22608)
Ops Day End Shift Summary
TITLE: 10/17 [DAY Shift]: 15:00-23:00 UTC (08:00-16:00 PDT), all times posted in UTC
STATE Of H1: Locked. Observing @ ~79 MPc.
SHIFT SUMMARY: Chris turned on CW injection. Recovered from lock loss after earthquake with minimal effort. No report if company here to blow out sprinklers has left.
INCOMING OPERATOR: Ed
ACTIVITY LOG: Nothing additional to report.
H1 General
patrick.thomas@LIGO.ORG - posted 15:20, Saturday 17 October 2015 (22607)
Back to observing
Only intervention was to touch up BS pitch after locking DRMI.

Ran a2l script.
H1 General
patrick.thomas@LIGO.ORG - posted 14:36, Saturday 17 October 2015 (22606)
Lock loss
Appears to be an earthquake. Spike up to ~ .9 um/s in 0.03 - 0.1 Hz seismic band.

USGS:
5.2 magnitude 73km S of Isangel, Vanuatu 2015-10-17 21:02:32 UTC 59.0 km deep

SUS S_R_M saturating (Oct 17 21:32:20 UTC)
SUS E_T_M_Y saturating (Oct 17 21:32:20 UTC)
SUS B_S saturating (Oct 17 21:32:20 UTC)
SUS I_T_M_X saturating (Oct 17 21:32:20 UTC)
Intention Bit: Commissioning (Oct 17 21:32:20 UTC)
ISC_LOCK state: DOWN (Oct 17 21:32:30 UTC)
DRMI Unlocked (Oct 17 21:32:30 UTC)
LHO General
patrick.thomas@LIGO.ORG - posted 12:53, Saturday 17 October 2015 (22605)
Ops Day Mid Shift Summary
Lock continues @ ~75 MPc.


16:58 UTC Went out of observing mode for Chris to turn on CW injection
16:59 UTC Chis turned on CW injection
17:01 UTC Went back to observing mode

18:36 UTC Red pickup truck leaving site from LSB (on camera)

18:54 UTC Sudarshan walking with parents from control room to top of bridge
19:47 UTC Sudarshan leaving site

SUS E_T_M_Y saturating (Oct 17 16:53:28 UTC)
SUS E_T_M_Y saturating (Oct 17 16:53:31 UTC)
SUS E_T_M_Y saturating (Oct 17 16:53:33 UTC)
Intention Bit: Commissioning (Oct 17 16:58:51 UTC)
CW Injection started (Oct 17 16:59:26 UTC)
Current time: Oct 17 17:00:00 UTC
Intention Bit: Undisturbed (Oct 17 17:01:56 UTC)
Current time: Oct 17 18:00:00 UTC
Current time: Oct 17 19:00:00 UTC
H1 INJ (DetChar, INJ)
christopher.biwer@LIGO.ORG - posted 09:57, Saturday 17 October 2015 - last comment - 10:23, Saturday 17 October 2015(22602)
Turning CW injections back on at H1
Chris, Patrick

I am going to turn the CW injections back on at H1.

We are currently in single-IFO mode right now. And since this is the first time we are going to turn these back on, as a precaution I will ask Patrick (the operator on shift) to turn the intent mode off. The intent mode should only be off for a couple minutes at most. I will make an aLog entry when this work is done and the intent mode is back on.

To do this we will:
  * Turn the intent mode off
  * Turn off the output of the continuous injection filterbank More specifically turn off INJ_CW and INJ_HARDWARE. There is a startup transient in INJ_HARDWARE that we do not want to enter into the ESD
  * log into h1hwinj1/ on a work station browser
  * start psinject using the monit web interface
  * After a short time (a few seconds) turn on the output of the continuous injection filterbank so we don't inject the startup transient
  * Turn the intent mode back on
Comments related to this report
christopher.biwer@LIGO.ORG - 10:02, Saturday 17 October 2015 (22603)DetChar, INJ
Patrick is turning the intent mode back on now. The CW injections are on.
christopher.biwer@LIGO.ORG - 10:23, Saturday 17 October 2015 (22604)DetChar, INJ
I've attached a 10 minute timeseries of HARDWARE_OUT_DQ after the CW injections have been turned on, and it looks like we are using the correct makefakedata_v4 version, ie. 1/20s glitches do not show up in this channel.
Images attached to this comment
H1 AOS (DetChar, SUS)
thomas.massinger@LIGO.ORG - posted 09:52, Saturday 17 October 2015 (22601)
No evidence of SUS DAC calibration glitches in recent data

TJ, Josh, Andy, Joe

We used the ~18 hours of low noise data on October 12th to do a systematic check for DAC calibration glitches in the suspensions and found no clear evidence of any glitches due to calibration coupling into DARM. This check looks at crossings of 0 and +/- 2^16 for all SUS MASTER_OUT channels being sent to the DAC.

There were a few channels that showed zero or 2^16 crossings in coincidence with glitches in DARM, but these seem to be due to large glitches in the DARM loop driving the DAC output through 2^16 rather than the DAC output crossing through 2^16 and causing glitches.

We think some zero-crossings in PR3 might be coupling noticeably into PRCL, but we're still looking into this. The NOISEMON channel for PR3 M3 seems like it might be in need of a tune-up, it doesn't seem consistent with what we're seeing from other NOISEMONs.

A summary of our findings is stored at the following wiki: https://wiki.ligo.org/viewauth/DetChar/ER8DACglitchHveto

LHO General
patrick.thomas@LIGO.ORG - posted 08:07, Saturday 17 October 2015 (22600)
Ops Day Beginning Shift Summary
TITLE: 10/17 [DAY Shift]: 15:00-23:00 UTC (08:00-16:00 PDT), all times posted in UTC
STATE Of H1: Observing @ ~ 78 MPc.
OUTGOING OPERATOR: Nutsinee
QUICK SUMMARY: From the cameras the lights are off in the LVEA, PSL enclosure, end X, end Y and mid X. I can not tell if they are off at mid Y. Seismic in 0.03 - 0.1 Hz band has just recovered from an earthquake and is around .015 um/s. Seismic in 0.1 - 0.3 Hz band is around .07 um/s. Winds are less than 10 mph.

Company on site blowing out sprinklers.
H1 General
nutsinee.kijbunchoo@LIGO.ORG - posted 08:04, Saturday 17 October 2015 (22599)
Ops Owl Shift Summary

TITLE: "10/17 [OWL Shift]: 07:00-15:00UTC (00:00-08:00 PDT), all times posted in UTC"

STATE Of H1: Observing at ~80 Mpc. IFO has been locked for 26 hours.

SUPPORT:

SHIFT SUMMARY: Nothing exciting until a 6.0M earthquake in Argentina (the R-wave arrive time was 05:19:26 PDT). LLO has been down for ~3 hours. The seismic activity in the earthquake band has come back to nominal. Low wind through out the night.

INCOMING OPERATOR: Patrick

ACTIVITY LOG:

14:50 Patrick's here early. He let a contractor through the gate (sprinkler blownout).

H1 General
nutsinee.kijbunchoo@LIGO.ORG - posted 04:27, Saturday 17 October 2015 (22598)
Owl Mid Shift Summary

The range seems to have increased slightly during the past 12 hours which seems to correspond to a decrease in seismic activity in 1-3Hz band. Low wind. Nominal seismic activity in the eq band and microseism.

H1 AOS
jeffrey.kissel@LIGO.ORG - posted 00:41, Saturday 17 October 2015 (22591)
How to Process DELTAL_EXTERNAL at Low Frequency to get the Calibration Right
J. Kissel

Inspired by several people looking at time-series and RMS of DARM that includes sub-10 [Hz] content (e.g. LHO aLOG 22513), I update my information on how well I think we can get the low frequency DARM displacement "right" below 10 [Hz] in the frequency domain by modifying H1:CAL-DELTAL_EXTERNAL_DQ in post-processing (originally posted in LHO aLOG 18248). 

The method for calibrating the CAL-DELTAL_EXTERNAL_DQ DARM channel and getting it "right" below 10 [Hz]:
(1) undo the 5 zeros at 1 [Hz], 5 poles at 100 [Hz] whitening DAQ filter LHO aLOG 16702 as one would normally do for this channel at all frequencies.
(2) compensate for the systematic error in CAL-CS from the rest of the low-frequency digital UIM/L1 LOCK L filter (FM1 "0.01:0", a pole at 0 [Hz], and a zero at 0.01 [Hz]) that we don't replicate in the CAL-CS actuation path because of numerical precision noise. (Originally discussed in LHO aLOG 17528)

That means, in DTT, one should apply the following calibration filter:
Gain: 0.01
Poles: 1,1,1,1,1, 0
Zeros: 100,100,100,100,100, 0.01
where the gain of (exactly) 0.01 is to normalize the z:p = (0.01 : 0) filter necessary for getting the actuation at low frequencies correct in step (2) -- i.e. 
2*pi*[0.01] / 2*pi = 0.01. (Don't ask me why one needs to normalize the z:p = 0.01:0 filter but not the 100^5:1^5 filter, cause I don't know.) 

Details and Explanations and Caveats:
------------------------------------
All calibration below 10 [Hz] still should be treated with some skepticism, because 
- we have little-to-no precision measurements of the scale factor, DARM OLGTF frequency dependence, and/or TST/UIM cross-over frequency in this band (and we don't plan on making any).  
- the online CAL-CS calibration does not compensate for any very low-frequency global control, a.k.a. "tidal correction." The "calibrations" of each end's servos that are in place claim the EPICs gains for the UGF are in [Hz] (as measured by the Green PDH), but I know these calibrations were not at all carefully done (in the "probably within a factor of 2" ballpark).
I compare against similarly "well" calibrated instrumentation in the attachment for comparison. Of course, there are lots of things going on with each of these instruments that makes this naive, "below the SUS resonances, DARM should be moving with the ground" comparison, including but not limited to
- tilt is always confusing the issue below ~0.1 [Hz] for the interial sensors I show, 
- I don't show the ITMs,
- there are many more mechanical DOFs of many more SUS than just the ETMs contributing to DARM at "mid" frequencies (between 0.1 and 5 [Hz]).
- gain peaking and sensor noise pollution from from all of the mid-frequency ASC loops.
- Angle to length coupling
- The GS13s that inform the ISIWIT channels are in-loop, and limited by sensor noise above ~0.5 [Hz]
- gain peaking from HEPI and ISI loops
- relative motion between the HAMs and BSCs on the readout chain of DARM
which makes the comparison difficult to say who's "right" with out a LOT more measurements and cross-checks.

In summary, I could say it's "within a factor of two," because I think we've done everything right, and that's what we always say when we first guess at how well we've done with these sorts of "worked on it carefully for a day, but no one else has looked at it, and it's the first time trying," things, but I have no measured proof to bound the uncertainty quantitatively.

--------------
Note because we've needed to do a better job at low-frequency to get the 10 [Hz] motion right, the additional corrections one must make to CAL-CS are at lower frequency than they used to be in ER7. 

Also note, this should be the same correction for H1:GDS-CALIB_STRAIN, because former is produced by the latter, and there are no known additional corrections / systematics that aren't already covered by the front-end's production of H1:CAL-DELTAL_EXTERNAL.

--------------
Why (2) works:
Remember that DELTAL_EXTERNAL is the sum of the calibrated DARM_ERR and DARM_CTRL channels,
DELTAL_EXTERNAL = (1 / C) * DARM_ERR + A * DARM_CTRL
where C is the sensing function (i.e. the IFO's "test mass DARM displacement sensor" calibration) and A is the actuation function (i.e. the ETMY transfer function). A dominates this sum below the DARM UGF at ~40 [Hz]. As such, well below 40 [Hz],
DELTAL_EXTERNAL ~ A * DARM_CTRL.
Since we're using hierarchical feed back to ETMY, where the UIM/TST or L1/L3 cross-over frequency is ~1 [Hz], then well below *that*,
DELTAL_EXTERNAL ~ A_{uim} * DARM_CTRL,
i.e. the total calibration for DELTAL_EXTERNAL "well" below 1 [Hz] is dominated by how accurately we reproduce / calibrate / model the UIM actuation path. Since the UIM digital filters we've intentionally left out in CAL-CS have frequency content below ~0.01 [Hz], they're simply "missing" from the calibration of DELTAL_EXTERNAL, and we can, offline, just multiply all of DARM by these filters, and get the "right" answer.

---------------
Images attached to this report
H1 General
nutsinee.kijbunchoo@LIGO.ORG - posted 00:18, Saturday 17 October 2015 (22597)
Owl Shift Transition

TITLE: Oct 17 OWL Shift 07:00-15:00UTC (00:00-08:00 PDT), all times posted in UTC

STATE Of H1: Observing

OUTGOING OPERATOR: Ed

QUICK SUMMARY: The ifo has been locking 18.5 hours. Wind below 5mph. Microseism reads 10^-1 um/s. Nominal seismic activity in EQ band (10^-2 um/s).

H1 DetChar (DetChar)
keith.riles@LIGO.ORG - posted 20:05, Saturday 26 September 2015 - last comment - 10:13, Monday 02 November 2015(21982)
Narrow lines in H1 DARM in O1 week 1
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
Images attached to this report
Non-image files attached to this report
Comments related to this report
keith.riles@LIGO.ORG - 12:53, Monday 28 September 2015 (22027)
A matlab file (37 MB) containing the averaged inverse-noise-weighted spectrum from the first week can be found here: 

https://ldas-jobs.ligo.caltech.edu/~keithr/spectra/O1/H1_O1_week1_0-2000_Hz.mat

Because of the way multiple epochs are handled, the matlab variable structure is non-obvious.
Here is how to plot the full spectrum after loading the file:  semilogy(freqcommon,amppsdwt{1,1})
nelson.christensen@LIGO.ORG - 07:39, Sunday 18 October 2015 (22614)
Keith has found:
"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)"

Using the coherence tool, we have seen coherence between h(t) and a number of auxiliary channels that shows this comb around 77 Hz. Seems to be around the input optics, in channels:
H1:PEM-CS_MAG_LVEA_INPUTOPTICS_Z_DQ  
H1_SUS-ITMY_L1_WIT_L_DQ
H1:SUS-BS_M1_DAMP_L_IN1_DQ      
H1_SUS-ITMY_L1_WIT_P_DQ
H1:SUS-BS_M1_DAMP_T_IN1_DQ          
H1_SUS-ITMY_L1_WIT_Y_DQ
H1:SUS-BS_M1_DAMP_V_IN1_DQ          
H1_SUS-ITMY_L2_WIT_L_DQ
H1:SUS-BS_M1_DAMP_Y_IN1_DQ         
H1_SUS-ITMY_L2_WIT_Y_DQ

See the attached figures.

Nelson, Soren Schlassa, Nathaniel Strauss, Michael Coughlin, Eric Coughlin, Pat Meyers
Images attached to this comment
soren.schlassa@LIGO.ORG - 11:09, Wednesday 21 October 2015 (22673)
The structure at 76.4Hz Nelson listed some channels for above shows up in at least 50 other channels. 

Greatest coherence is consistently at 76.766 Hz, second greatest is (mostly) consistently at 76.854Hz. 

Spacing between the two combs is about 0.0013Hz.

The epicenter seems to be the INPUTOPTICS/the SUS-BS and SUS-ITM* channels, like Nelson said (see below for fuller list).

The plots above are pretty typical, but I have plots for all channels listed and can post any more that are useful. Most or all channels showing the comb with max coherence greater than 0.1 are listed below. Max coherences over 0.2 are marked below as strong, and max coherences under 0.15 as weak. Those marked strongest are around 0.22. I haven't included anything of max coherence <0.1 but I'm sure there are many.

H1:ASC-AS_A_RF36_I_PIT_OUT_DQ (weak)
H1:ASC-AS_A_RF36_I_YAW_OUT_DQ
H1:ASC-AS_A_RF36_Q_PIT_OUT_DQ
H1:ASC-AS_A_RF36_Q_YAW_OUT_DQ (weak)
H1:ASC-AS_B_RF36_I_YAW_OUT_DQ
H1:ASC-AS_B_RF36_Q_YAW_OUT_DQ (strong)
H1:ISI-BS_ST2_BLND_RZ_GS13_CUR_IN1_DQ (strong)
H1:ISI-BS_ST2_BLND_Z_GS13_CUR_IN1_DQ (strong)
H1:ISI-HAM2_BLND_GS13RZ_IN1_DQ
H1:ISI-HAM2_BLND_GS13Z_IN1_DQ
H1:ISI-HAM3_BLND_GS13Z_IN1_DQ (strong)
H1:ISI-HAM5_BLND_GS13RZ_IN1_DQ
H1:ISI-HAM5_BLND_GS13Z_IN1_DQ
H1:ISI-HAM6_BLND_GS13RZ_IN1_DQ
H1:ISI-ITMX_ST2_BLND_RX_GS13_CUR_IN1_DQ (weak)
H1:ISI-ITMX_ST2_BLND_Z_GS13_CUR_IN1_DQ (strong)
H1:ISI-ITMY_ST1_BLND_RZ_T240_CUR_IN1_DQ (weak)
H1:ISI-ITMY_ST1_BLND_Y_T240_CUR_IN1_DQ (weak)
H1:ISI-ITMY_ST2_BLND_RZ_GS13_CUR_IN1_DQ (strong)
H1:ISI-ITMY_ST2_BLND_Z_GS13_CUR_IN1_DQ (strong)
H1:LSC-PRCL_IN1_DQ
H1:PEM-CS_LOWFMIC_LVEA_VERTEX_DQ (strong)
H1:PEM-CS_MAG_LVEA_INPUTOPTICS_Y_DQ (strongest)
H1:PEM-CS_MAG_LVEA_INPUTOPTICS_Z_DQ (strong)
H1:SUS-BS_M1_DAMP_L_IN1_DQ (strongest)
H1:SUS-BS_M1_DAMP_T_IN1_DQ (strong)
H1:SUS-BS_M1_DAMP_V_IN1_DQ (strong)
H1:SUS-BS_M1_DAMP_Y_IN1_DQ (strong)
H1:SUS-ITMX_M0_DAMP_R_IN1_DQ (strong)
H1:SUS-ITMX_M0_DAMP_V_IN1_DQ (strong)
H1:SUS-ITMY_L1_WIT_L_DQ (strong)
H1:SUS-ITMY_L1_WIT_P_DQ (strong)
H1:SUS-ITMY_L1_WIT_Y_DQ (strong)
H1:SUS-ITMY_L2_WIT_L_DQ (strong)
H1:SUS-ITMY_L2_WIT_P_DQ (strong)
H1:SUS-ITMY_L2_WIT_Y_DQ (strong)
H1:SUS-MC1_M3_WIT_L_DQ
H1:SUS-MC1_M3_WIT_P_DQ (weak)
H1:SUS-MC2_M1_DAMP_L_IN1_DQ
H1:SUS-MC2_M1_DAMP_T_IN1_DQ
H1:SUS-MC2_M1_DAMP_Y_IN1_DQ
H1:SUS-PR2_M1_DAMP_P_IN1_DQ
H1:SUS-PR2_M1_DAMP_R_IN1_DQ
H1:SUS-PR2_M1_DAMP_V_IN1_DQ
H1:SUS-PR2_M3_WIT_L_DQ
H1:SUS-PR2_M3_WIT_P_DQ (weak)
H1:SUS-PR2_M3_WIT_Y_DQ (weak)
H1:SUS-PR3_M1_DAMP_P_IN1_DQ
H1:SUS-PR3_M1_DAMP_V_IN1_DQ
H1:SUS-PRM_M1_DAMP_L_IN1_DQ (strongest)
H1:SUS-PRM_M1_DAMP_T_IN1_DQ
H1:SUS-PRM_M1_DAMP_Y_IN1_DQ (strong)
soren.schlassa@LIGO.ORG - 23:07, Sunday 25 October 2015 (22825)
The 99.9989Hz comb Keith found (designated H) appears in 109 channels (list is attached). Coherence is uniformly greatest at the ~500Hz harmonic, with many channels approaching .7 and greater, drops off sharply at the ~600Hz and ~700Hz, and is invisible after 700. (See spreadsheet titled "comb_H_sigcohs_wk1.xslx" for a list of cohering channels by line, with coherence value.) 

At all harmonics except the ~300Hz, the structure manifests in the signal and the coherences as two lines .001Hz apart, but if I recall correctly .001Hz is the resolution of the frequency series, so it's safer to say that this is a bulge with .001Hz < width < .002Hz. At ~300Hz, almost all the cohering channels with data in that range show a bulge of width about 0.5Hz (see attached "disjoint_plots" for a comparison of typical channels by harmonic). This bulge, and the fact that it appears in all the same channels associated with the rest of the comb, makes me think that the fundamental may be the bulge at ~300Hz and not the line at 99.9989Hz. An interesting feature of the bulge is that in many cases, it has a prominent upward or downward spike at 299.96Hz, which is just the place the line would be if it were there (see "bulge_w_spike.jpg").

More to come re: changes in week 4 data, patterns in cohering channels, and the spike.
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