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Reports until 08:45, Friday 10 July 2015
LHO General
thomas.shaffer@LIGO.ORG - posted 08:45, Friday 10 July 2015 (19538)
Morning Meeting Minutes

Vac

SEI

SUS

CDS

Fac

Comm

 

 

Weekend Work: Elli and Nutsinee will be coming in to do HWS work

Work safe and have a great weekend!

H1 ISC
sheila.dwyer@LIGO.ORG - posted 18:53, Thursday 09 July 2015 - last comment - 11:40, Friday 10 July 2015(19537)
Locking recovery continues

Sheila, Stefan, Elli, Nic

This afternoon we got a little more time with the IFO.  We redid inital alingment and were able to engage the ASC which increased our recycling gain.  We were able to power up to 15 Watts without a problem, when we increased the power to 23 Watts a 0.4 Hz oscillation that showed up mostly in SRC1 PIT and SRC2 PIT knocked us out of lock.  We've had difficulty in the early part of the evening with ALS, we have the glitches that show up in the arms even when only the arms are locked, reminding us of the glitches seen in alogs 17576 and 15242.  As before, these glitches went away a couple of hours and we are now locking OK again.  

We have reduced the time for the REFL trans ramp from 5 seconds to 1 second, this seems to be fine and we could think about making it shorter or reducing other ramp times in the final stages of CARM offset reduction.  We haven't had the REFL trans lockloss today, but this problem has always been intermittent so we will have to continue locking for several days to see if speeding it up actually helped.  

Comments related to this report
sheila.dwyer@LIGO.ORG - 10:28, Friday 10 July 2015 (19543)

Screen shots of several of these ALS locklosses that seemed to go away after a few hours.

Images attached to this comment
sheila.dwyer@LIGO.ORG - 11:40, Friday 10 July 2015 (19545)

We've had a similar problem this morning.  We saw one glitch at around 18:11:24 UTC, at this time we were sitting with only the arms locked and tidal from the green PDH to the ETMs.  

Now the problem has gone away on its own again.

Images attached to this comment
H1 PEM (PEM)
dale.ingram@LIGO.ORG - posted 17:25, Thursday 09 July 2015 (19536)
Hanford truck traffic update
On June 29, 2015, LHO received a forwarded email from Hanford site personnel which contained this comment:  "Beginning Monday, July 6, there will be an increase in truck traffic . . . near the 300 Area. Waste material will be shipped to the Environmental Restoration Disposal Facility in central Hanford. The remediation effort will continue until the spring of 2016 . . . truck traffic will be present between the hours of 7 a.m. and 3:30 p.m."  The truck traffic mentioned here is the familiar ~30-ton loads in orange containers riding on transport trucks from the Hanford 300 area (~12 miles SE of LHO) to the ERDF pit (~10 miles W of LHO).  One of our site contacts indicates that we can expect about 120 loads per day to ERDF (meaning 2x round trips, but the reverse trip is with an empty container).  At present the hauling contractor anticipates that the loads will move only on the day shift, but these plans could change.  Current daytime PEM-SEIS 1-3Hz plots show this additional traffic. 
LHO VE
kyle.ryan@LIGO.ORG - posted 17:13, Thursday 09 July 2015 (19535)
Misc. vacuum
1010 hrs. local -> Spun down Y-end turbo and scroll pumps 

1040 hrs. local -> Started pump cart at Y-end RGA and energized RGA filament 

1105 hrs. local -> Spun down X-end turbo and scroll pumps 

1530 hrs. local -> started scan of Y-end 

1545 hrs. local -> Valved-out Y-end NEG 

1600 hrs. local -> Valved-in Y-end NEG 

1615 hrs. local -> Stopped Y-end RGA scan 

16?? hrs. local -> De-energized Y-end turbo levitation 

1655 hrs. local -> De-energized X-end turbo levitation
LHO General
thomas.shaffer@LIGO.ORG - posted 16:01, Thursday 09 July 2015 (19534)
Ops Day Shift Log

0829 - Elli to LVEA to turn on Illuminators

0848 - Elli out

0939 - Buba to Mids for fan work

0956 - Kyle to EY to turn on pumop cart

1129 - Bubba back

1144 - Nick to LVEA ISCT1

1145 - Hugh to LVEA to unlock HAM6 HEPI

1146 - Elli, Mike, and students to LVEA for quick tour

1151 - Leo starting charge measurements

1200 - Mike and students out

1210 - Hugh out

1214 - Elli out

1320 - Gerardo to EX to retrieve vac equipment then to MY

1350 - Fil to EX getting length for the new cables to be installed

1509 - Gerardo back

1516 - Kyle to EY for RGA scan

H1 ISC
nicolas.smith@LIGO.ORG - posted 15:19, Thursday 09 July 2015 - last comment - 14:33, Friday 10 July 2015(19531)
Sensing noise on REFLAIR 9MHz

Summary

The current of the REFLAIR diode while in lock is about a factor of 10 below where shot noise is equivalent to dark noise.

Details

In order to better understand the out-of loop behavior of the Common Mode loop, I did a lightbulb test on the REFLAIR_A diode. The thermal radiation from the lightbulb acts like a quantum limited light source at 9MHz.

lightbulb

The light was powered by a benchtop DC power supply. I mounted the bulb right in front of the diode and varied the DC light level (as seen by the REFLAIR_LF channel) and recorded the noise floor in the REFLAIR 9MHz demodulated channels. The whitening gain was temporarily changed from 12dB to 42dB for this test to overcome the ADC noise level.

The attached pdf file shows the noise vs current curve, and a fit. EDIT: apparently the LF channel is already calibrated in milliWatts. The 9MHz channel is not calibrated to physical units (though the calibration could be determined from the shot noise). As one can see, the light level we use in lock is about 10 times smaller than where shot noise starts to overcome dark noise.

REFLAIR also has an ND filter stack screwed directly on the diode box. Since we have so little light, maybe we should remove it.

Images attached to this report
Non-image files attached to this report
Comments related to this report
nicolas.smith@LIGO.ORG - 15:28, Thursday 09 July 2015 (19533)

data files

Non-image files attached to this comment
evan.hall@LIGO.ORG - 14:33, Friday 10 July 2015 (19549)

The amount of rf coming out of REFL9 in full lock (at 20+ W) is about −10 dBm, or 70 mV. It should be fine to switch over.

Images attached to this comment
H1 PSL
edmond.merilh@LIGO.ORG - posted 15:11, Thursday 09 July 2015 (19532)
PSL DBB scans + ISS Scan
Non-image files attached to this report
H1 CAL (CAL)
sudarshan.karki@LIGO.ORG - posted 14:31, Thursday 09 July 2015 (19529)
PCAL Excitation turned on

PCAL Laser were turned back on yesterday after the vent recovery at endstations and now the pcal calibration lines are turned on as well.

H1 ISC (ISC)
hang.yu@LIGO.ORG - posted 14:18, Thursday 09 July 2015 (19502)
LHO Noise Budget updates
Sheila, Kiwamu, Chris, Hang

An update of LHO's noise budget is attached ('NB07082015.png'). It used the data from 06/07/2015, at 4:00:00 am UTC, whose predicted BNS inspiral range should be ~60 Mpc according to the summary page. 

Some major updates are: 
1. in SUS/ETMY, updated the ESD driver gain and the TST filter.

2. in LSC Digital, replaced the OMC Front End block.

3. in addition to those already existed 'mystery' gain blocks, some new ones were added. In order to make the NB predicted data match the measured ones (at least at high frequencies) while maintaining each DOF's open loop transfer function consistent with the measurement ('LoopGain07082015.png'), those blocks had to be added before the injection of quantum vacuum noises to have the proper suppression. This seemed indicating that the optickle model was not working perfectly? 

4. A new front end calibration model was built to replace the old OAF.mdl. A comparison between the FE cal and NB was shown in 'FEcheck07082015.png'. In the plot all the blue curves were obtained from the FE Cal and green ones from the NB.

Besides, I also included two plots showing the coupling from MICH (SRCL) to DARM predicted by the NB model, which was generated by measuring TF from MICH (SRCL) control signal (in [ct]) to DARM sensor (in [ct]), then dividing it by the TF from DARM cal (in [m]) to DARM sensor, so the transfer function's unit was [m/ct]. See 'MICH2DARM07082015.png' and 'SRCL2DARM07082015.png'. 

* 07/09/2015: font size increased. Sorry for the previous tiny font size...
Images attached to this report
H1 SEI
hugh.radkins@LIGO.ORG - posted 13:53, Thursday 09 July 2015 (19528)
WHAM6 ISI vertical Actuator Drives are higher than others.

After turning the HEPI loops on, noticed the drives to the ISI vertical Actuators are running about 10x higher than usual (compared to the other ISIs.)  Based on the Isolation loops output, these appear to be primarily from the Z dof.  I can't say how much displacement this represents but I'm sure the alignment will be fine if this offset where zero'd.

H1 SEI
hugh.radkins@LIGO.ORG - posted 13:48, Thursday 09 July 2015 (19527)
WHAM6 SEI HEPI Unlocked (off hard stops) Runs fine

VE is done with climbing on the chamber and a lock loss provided a window.  No issues unlocking and things look clear but I have not run a range of motion check.  Maybe should be done but I'll think it can wait til Tuesday.

Alignment restored to historic position--that is, the reference/target position is unchanged.

Please mind the signs on the HEPI Housings

H1 SYS (DetChar, GRD, ISC, PEM, SEI, SYS)
sheila.dwyer@LIGO.ORG - posted 12:56, Thursday 09 July 2015 (19525)
Note on ER7 duty cycle posted in DDCC

I've posted a note in the DCC with some information about our duty cycle durring ER7, and some of the causes of downtime. 

https://dcc.ligo.org/DocDB/0120/T1500368/001/ER7DutyCycleNote.pdf

  I will possibly update this with more information about DRMI locking durring high winds and when it is and is not necessary to wait for bounce and roll modes to ring down in the coming days. 

H1 ISC
sheila.dwyer@LIGO.ORG - posted 12:51, Thursday 09 July 2015 - last comment - 14:49, Thursday 09 July 2015(19522)
Recycling gain, alignment offsets

Sheila, Elli

I moved the ITMs to improve the recycling gain, as well as the PRM.  To get from a recylcing gain of just under 36 to 39 I mostly moved ITMY in yaw.  This may be a different alignment than what we were using durring ER7, but it seems to be an improvement over the alingments we had yesterday, so we have updated references for now.  The green alignment in the X arm did not change, but Elli and I redid the green QPD offsets and camera position for the Y arm.  We lost lock and relocked allowing the ASC to engage with the guardian using these new IR QPD offsets, which was fine and brought us to a recycling gain of 39 again.  For now the many people who want to do things incompatible with full locking have taken over the IFO.  

Old offsets:

  sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-Y_TR_A_PIT_OFFSET H1:ASC-Y_TR_A_YAW_OFFSET H1:ASC-Y_TR_B_PIT_OFFSET H1:ASC-Y_TR_A_PIT_OFFSET

H1:ASC-Y_TR_A_PIT_OFFSET       -0.192
H1:ASC-Y_TR_A_YAW_OFFSET       -0.365
H1:ASC-Y_TR_B_PIT_OFFSET       -0.32
H1:ASC-Y_TR_A_PIT_OFFSET       -0.192
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-X_TR_A_PIT_OFFSET H1:ASC-X_TR_A_YAW_OFFSET H1:ASC-X_TR_B_PIT_OFFSET H1:ASC-X_TR_B_YAW_OFFSET                 H1:ASC-X_TR_A_PIT_OFFSET       -0.084
H1:ASC-X_TR_A_YAW_OFFSET       -0.023
H1:ASC-X_TR_B_PIT_OFFSET       -0.212
H1:ASC-X_TR_B_YAW_OFFSET       0.006
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-POP_A_PIT_OFFSET H1:ASC-POP_A_YAW_OFFSET
H1:ASC-POP_A_PIT_OFFSET        0.4
H1:ASC-POP_A_YAW_OFFSET        0.26
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-POP_A_PIT_OFFSET H1:ASC-POP_A_YAW_OFFSET
H1:ASC-POP_A_PIT_OFFSET        0.4
H1:ASC-POP_A_YAW_OFFSET        0.26
Green references:
H1:ALS-Y_QPD_B_YAW_OFFSET  0.2
H1:ALS-Y_QPD_A_YAW_OFFSET  -0.2
 
 H1:ALS-Y_CAM_ITM_PIT_OFS 300
 H1:ALS-Y_CAM_ITM_YAW_OFS 428.5
 
New offsets:
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-Y_TR_A_PIT_OFFSET H1:ASC-Y_TR_A_YAW_OFFSET H1:ASC-Y_TR_B_PIT_OFFSET H1:ASC-Y_TR_A_PIT_OFFSET
H1:ASC-Y_TR_A_PIT_OFFSET       -0.118
H1:ASC-Y_TR_A_YAW_OFFSET       -0.242
H1:ASC-Y_TR_B_PIT_OFFSET       -0.369
H1:ASC-Y_TR_A_PIT_OFFSET       -0.118
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-Y_TR_A_PIT_OFFSET H1:ASC-Y_TR_A_YAW_OFFSET H1:ASC-Y_TR_B_PIT_OFFSET H1:ASC-Y_TR_A_PIT_OFFSET
H1:ASC-Y_TR_A_PIT_OFFSET       -0.118
H1:ASC-Y_TR_A_YAW_OFFSET       -0.242
H1:ASC-Y_TR_B_PIT_OFFSET       -0.369
H1:ASC-Y_TR_A_PIT_OFFSET       -0.118
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-X_TR_A_PIT_OFFSET H1:ASC-X_TR_A_YAW_OFFSET H1:ASC-X_TR_B_PIT_OFFSET H1:ASC-X_TR_B_YAW_OFFSET 
H1:ASC-X_TR_A_PIT_OFFSET       -0.048
H1:ASC-X_TR_A_YAW_OFFSET       -0.004
H1:ASC-X_TR_B_PIT_OFFSET       -0.148
H1:ASC-X_TR_B_YAW_OFFSET       0.078
sheila.dwyer@opsws3:~/StripTools$ caget H1:ASC-POP_A_PIT_OFFSET H1:ASC-POP_A_YAW_OFFSET
H1:ASC-POP_A_PIT_OFFSET        0.38
H1:ASC-POP_A_YAW_OFFSET        0.248
Green references:
H1:ALS-Y_QPD_B_YAW_OFFSET  -0.4
H1:ALS-Y_QPD_A_YAW_OFFSET  0.2
 
 H1:ALS-Y_CAM_ITM_PIT_OFS 303.9
 H1:ALS-Y_CAM_ITM_YAW_OFS 433.5
Comments related to this report
eleanor.king@LIGO.ORG - 14:49, Thursday 09 July 2015 (19530)

In addition, ASC-Y_TR_B_YAW_OFFSET was changed from -0.237 to -0.318.

H1 ISC (CDS)
daniel.hoak@LIGO.ORG - posted 09:53, Thursday 09 July 2015 (19520)
ITMY and ITMX Green Camera Reference

Elli, Hannah

To create a reference of the ITMX Green for locking.

Using singleImage_checkSaturation.m (/ligo/home/eleanor.king/scattering/singleImage_checkSaturation.m) we took images of the ITMX/Y Green cameras from ER7 ( /ligo/data/camera/archive/2015/06/05 "H1 ITMY Green (h1cam24)_2015-06-05-16-30-58.tiff" and "H1 ITMX Green (h1cam22)_2015-06-05-15-16-43.tiff)

Compared them with pictures taken today. (/ligo/data/camera "ITMY_green_illuminator_H1 ITMY Green (h1cam24)_2015-07-09-16-03-52.tff" and "IMTX_green_illuminator_H1 ITMX Green (h1cam22)_2015-07-09-16-03-43.tiff")

The cameras appear stable. We determined this by looking at the relative position of prominant features of the scattering.

Images attached to this report
Non-image files attached to this report
H1 PSL
edmond.merilh@LIGO.ORG - posted 09:21, Thursday 09 July 2015 (19519)
PSL Weekly Report - Past 10 day Trends
Images attached to this report
LHO General
richard.oram@LIGO.ORG - posted 07:58, Thursday 09 July 2015 (19515)
L1 PSL lock-out is now released

FYI:

The lock-out on the L1 PSL is now released.

All conditions in the original memo have been met. 

The release memo is here: https://dcc.ligo.org/M1500231

H1 DetChar (DetChar)
keith.riles@LIGO.ORG - posted 21:22, Thursday 04 June 2015 - last comment - 08:39, Thursday 09 July 2015(18879)
Narrow lines in early ER7 data
Following up this earlier report on pre-ER7 narrow lines in H1 DARM, attached is a corresponding
list of early ER7 lines and some spectra for 30.5 hours of data from May 31 through June 4 at 13:00 UTC, based
on FScans SFTs generated as of Thursday morning. 

Figure 1 shows the 0-2000 Hz spectrum for the early ER7 data with line labels according to the same scheme as before.

Figure 2 shows the mid-May and early ER7 spectra overlain without line label clutter.

Attachment 1 is the early ER7 line list (nearly identical in line frequencies but not strengths to that of mid-May)

Attachment 2 is a zipped tar file of 27 sub-band spectra for early ER7 with lines labeled.

Attachment 3 is a zipped tar file of 27 sub-band spectra comparing mid-May to early ER7 without labels.

I haven't yet digested all of the changes from mid-May to the early ER7A data (what I call ER7A here), but here are things that are immediately apparent::
  • Bounce and roll modes are greatly reduced in this ER7 sample
  • Quad violin modes are less excited in this ER7 sample
  • The previous comb with a fundamental of 36.9733 Hz (54 harmonics visible) has shifted slightly to a fundamental of 36.9725 Hz (50 harmonics visible).
  • The broad structures seen in the 280-440 Hz band are worse in early ER7 than in mid-May (due to PSL jitter, if I understood Robert correctly)
  • The nefarious OMC alignment dithers and their upconversion have reappeared in what the CW group considers to be an astrophysically interesting band (anything below 2 kHz) at frequencies of 1675.1, 1700.1, 1725.1 and 1750.1 Hz
  • Whatever dithers there were previously at 81.0000 and 310.0000 Hz have disappeared.
Images attached to this report
Non-image files attached to this report
Comments related to this report
nelson.christensen@LIGO.ORG - 08:39, Thursday 09 July 2015 (19516)DetChar, PEM
We used the coherence tool to try and see if there was a coherence between h(t) and other channels for this 36.9725 Hz noise line and its harmonics.

There is a coherence between the h(t) channel and ...
H1:PEM-CS_MAG_EBAY_SUSRACK_Z_DQ
at
36.9725 Hz * 2 =  73.9450 Hz (definitely)
36.9725 Hz * 3 = 110.9175 Hz (barely above background)
36.9725 Hz * 4 = 147.89 Hz (definitely)
36.9725 Hz * 5 =  184.8625 Hz (above background)
36.9725 Hz * 6 = 221.8350 Hz (definitely)
...
For whatever reason the even harmonics are stronger.
The mat file for the coherence is here:
https://ldas-jobs.ligo-wa.caltech.edu/~eric.coughlin/ER7/LineSearch/H1_COH_1116633616_1118275216_SHORT_1_webpage/data/H1:PEM-CS_MAG_EBAY_SUSRACK_Z_DQ_data.mat

For H1:PEM-CS_MAG_EBAY_SUSRACK_X_DQ there is a coherence with h(t) at
36.9725 Hz * 4 = 147.89 Hz (barely about background)
See
https://ldas-jobs.ligo-wa.caltech.edu/~eric.coughlin/ER7/LineSearch/H1_COH_1116633616_1118275216_SHORT_1_webpage/data/H1:PEM-CS_MAG_EBAY_SUSRACK_X_DQ_data.mat

For For H1:PEM-CS_MAG_EBAY_SUSRACK_Y_DQ there is a coherence with h(t) at
36.9725 Hz * 2 = 73.9450 Hz (barely above background)
36.9725 Hz * 4 = 147.89 Hz (above background)
36.9725 Hz * 5 =  184.8625 Hz (barely above background)
36.9725 Hz * 6 = 221.8350 Hz (above background)
...
See
https://ldas-jobs.ligo-wa.caltech.edu/~eric.coughlin/ER7/LineSearch/H1_COH_1116633616_1118275216_SHORT_1_webpage/data/H1:PEM-CS_MAG_EBAY_SUSRACK_Y_DQ_data.mat
 
Nothing in the other magnetometers.

Nelson, Eric Coughlin, Michael Coughlin
H1 DetChar (DetChar)
keith.riles@LIGO.ORG - posted 12:12, Tuesday 02 June 2015 - last comment - 08:44, Thursday 09 July 2015(18764)
Narrow lines in H1 DARM
Attached is a pre-ER7 list of narrow lines seen above 5 Hz in recent H1 DARM data, along with spectra containing labels for the lines.

The spectra used for line-hunting are from 18 hours of DC-readout conditions on May 17. Most of the lines were also seen
in the early-May mini-run data, but are more exposed in the more sensitive May 17 data (see figure 1)

Notable combs / lines:
  • Exact integers: 16.0000 Hz, 64.0000 Hz (distinctly louder than other 16-Hz lines), 81.0000 Hz, 1150.0000 Hz, 1672.0000 Hz, 1704.0000 Hz, 1880.0000 Hz, 1896.0000 Hz
  • Nearly exact-integer combs:
    • 3.9994 Hz (offset by ~2 Hz from zero, first visible harmonic at 13.9977 Hz -- these seem to correlate with a near 4-Hz comb starting at 2 Hz in EX magnetometers (and to a lesser degree in EY magnetometers), where the contamination in DARM at 10 Hz and below is presumably too faint to be seen in the rapidly rising DARM noise. A strong comb is apparent in PEM FScans.
    • 99.9989 Hz (correlated with magnetometers in EX - see NoEMi and PEM FScans)
  • Quad suspension violin modes with fundamentals near 500 Hz are not quite truly harmonic, but some of their upconversion is (see figure 2)
  • Especially pervasive combs: 3.9994 Hz (34 harmonics), 16.0000 Hz (124 harmonics), 60.0 Hz (9 harmonics), 64.0000 Hz (31 harmonics), 36.9733 (54 harmonics), 59.9954 (6 harmonics), 99.9989 (13 harmonics)
  • There are tentative identifications here of lines near 300 Hz and their harmonics as due to beam splitter violin modes, but their frequencies shifted by several mHz between the mini-run and the May 17 lock stretches, unlike the quad suspension violin modes which hardly moved at all (attributable to temperature?)
  • Designated calibration line frequencies are shown on the spectra even when there is no apparent line (some not yet enabled?)
Notes:
  • Because the binning in the spectra is 0.5 mHz (based on 30-minute FScan Hann-windowed SFTs), but the line widths in the plots are much larger, the spectra shown here look awful (but aren't). Dewhitening applies five poles at 1 Hz and five zeroes at 100 Hz.
  • I didn't bother labeling the forest of bounce/roll-mode sidebands on the quad suspensions and their harmonics
  • Although the 1150-Hz line seems well centered on the integer value, its energy is spread over several tenths of a Hz, unlike other integer-Hz lines
  • Many line frequencies are give to four digits after the decimal point, but their statistical uncertainties are typically no better than a few tenths of a mHz, and based on changes between early and mid May, some lines have systematic drifts of O(mHz).
  • With one exception, the quad violin mode fundamental frequencies were determined from the mini-run data, where they were more excited than on May 17. Those frequencies agree (independently) to within 2 mHz (in most cases, to better than 1 mHz) with the frequencies measured for individual test masses here. The one exception was that I had originally marked 504.1492 Hz as a mode in the mini-run, while the earlier study had found a mode instead at 501.254 Hz. Since the earlier measurements are guided by test-stand data, I am deferring to them and tagging 501.2544 Hz here, since I do see a line there in the mini-run data, albeit weaker than other modes.
Key to spectra labels: b = Bounce modes r = Roll modes C = Calibration lines L = Lock-in oscillator M = Power Mains comb N = Near to power mains comb S = 64 Hz comb s = 16 Hz comb F = Near to 4 Hz (3.9994 Hz) comb H = Near to 100 Hz (99.9989 Hz) comb D = 59.3155 Hz comb E = 36.9733 Hz comb G = 75.23 Hz comb Q = Quad violin modes B = Beam splitter violin modes x = Miscellaneous singlets Figures: 1 - Superposition of 0-2000 Hz spectra for minirun (29.5 hours) and May 17 data (18 hours) 2 - Quad violin mode regions for first three harmonics (actual modes are non-harmonic, but some upconversion of fundamental is propagation harmonically) 3 - May 17 spectrum with labeled lines Other attachments: 1 - Ascii list of narrow lines / combs found in 0-2000 Hz 2 - zipped tar file of 27 sub-band spectra (mostly 100-Hz wide)
Images attached to this report
Non-image files attached to this report
Comments related to this report
keith.riles@LIGO.ORG - 12:17, Tuesday 02 June 2015 (18785)
I meant to attach the excited violin mode spectrum stack from the mini-run, not from the mid-May data,
to illustrate the harmonicity of the upconversion. Here is the right plot.
Images attached to this comment
nelson.christensen@LIGO.ORG - 08:44, Thursday 09 July 2015 (19517)DetChar, PEM
We used the coherence tool on the full ER7 data to try and find coherence between h(t) and other channels for the 99.9989 Hz line and its harmonics.

There is a coherence between h(t) and ...
H1:PEM-CS_MAG_EBAY_SUSRACK_Z_DQ
at
99.9989*1= 99.9989 Hz with coherence of 0.038
99.9989*2 = 199.9978 Hz with coherence of 0.03
99.9989*3 = 299.9967 Hz with coherence of 0.11
99.9989*4 = 399.9956 Hz with coherence of 0.11
99.9989*5 = 499.9945 Hz with coherence of 0.022
99.9989*10 = 999.989 Hz with coherence of 0.13
Similar results for
H1:PEM-CS_MAG_EBAY_SUSRACK_X_DQ
H1:PEM-CS_MAG_EBAY_SUSRACK_Y_DQ
H1-PEM-CS_MAG_LVEA_OUTPUTOPTICS_X_DQ
H1-PEM-CS_MAG_LVEA_OUTPUTOPTICS_Y_DQ
H1-PEM-CS_MAG_LVEA_OUTPUTOPTICS_Z_DQ
H1:PEM-CS_MAG_LVEA_VERTEX_X_DQ
H1-PEM-EY_MAG_EBAY_SUSRACK_Y_DQ
H1-PEM-EY_MAG_EBAY_SUSRACK_Z_DQ
H1-PEM-EX_MAG_EBAY_SUSRACK_X_DQ
H1-PEM-EX_MAG_EBAY_SUSRACK_Y_DQ
H1-PEM-EX_MAG_EBAY_SUSRACK_Z_DQ

The coherence is present but less strong in
H1:PEM-CS_MAG_LVEA_VERTEX_Z_DQ
99.9989*10 = 999.989 Hz with coherence of 0.06
Not really visible in
H1:PEM-CS_MAG_LVEA_VERTEX_Y_DQ

We don't see this line in
H1-PEM-EY_MAG_EBAY_SUSRACK_X_DQ
H1-PEM-EX_MAG_VEA_FLOOR_Z_DQ
H1-PEM-EX_MAG_VEA_FLOOR_Y_DQ
H1-PEM-EX_MAG_VEA_FLOOR_X_DQ
H1-PEM-EY_MAG_VEA_FLOOR_X_DQ
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Nelson, Eric Coughlin, Michael Coughlin
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