I saw the lock degrading in the same way H1 had issues at the end of O1, and tweaked TMSX and TMSY to regain range and quiet arm powers.
Lock lasted 7+ hours.
Did we have a servo on TMS back then? Is it commissioned and running now?
Jim was trying some different EQ sensor correction filters on the HAMs yesterday. The operator, likely, reverted these to normal around 6pm. In the future, please make a log when this is done.
State of H1: locked in NLN 7 hours
Details / Activities:
My TCS alog 30955.
As I watch, range has held steady around 60MPc.
State of H1: Nominal Low Noise
Range: 68MPc
Target for changing TCS: 9:10UTC
PEM injections completed for tonight
State of H1: relcoked in Low Noise
Outgoing Ops: TJ
On Site: Robert, doing PEM injections in the LVEA
Details:
TITLE: 10/28 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: Locking is much better than the past few days, the only thing to mention is that BS seems to be drifting in pitch at times. While locking DRMI I'll adjust it, and meanwhile AS90 will slowly drift down, adjusting the BS P again seems to bring it right back to was. After locklosses BS P always seemed to be off by a bit as well. The MICH ASC error signal seems to be the noisiest during lock, but maybe this is normal, I can't remember. I didn't want to mess up Robert while he was doing work so I haven't tried adjusting it to maybe correct for the downward trend in the range.
The PR2 Roll mode has been reduced in the DARM spectrum by adding 1Hz wide bandstops (centered at 40.9Hz) to all the top mass damping loops for PR2.
Once these were on the line in DARM at 40.934Hz is gone. There are other HSTS roll modes which now show up, 40.918 (MC2 or SR2 maybe) and something smaller at about 40.937Hz.
Exhaust pressure at CP4 was at 4 psi in PI mode so I opened up the bypass valve again.
Pump acts much better with bypass exhaust valve open, so that will be the nominal state for now.
TITLE: 10/27 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Commissioning
INCOMING OPERATOR: TJ
SHIFT SUMMARY: Locked at NLN for the first couple hours of my shift. Robert doing PEM injections during this period until lock was broken due to me forgetting to turn off the BRS and Robert getting too close to it. Middle part of the day was Betsy cleaning the PSL viewport. Then we immediately had another EQ when they finished. Relocking commenced in the last couple of hours of my shift.
LOG:
15:00 Robert to LVEA doing PEM injections. Took IFO out of Observing mode due to the injections.
16:40 Robert to EY for PEM inj.
17:45 Betsy, Robert, Peter, Richard to LVEA
17:50 Peter out
17:52 Chandra to MY
19:00 Fil to LVEA
19:08 Fil out
19:30 Fil to LVEA
20:02 Richard to LVEA
20:50 Betsy, Robert done
Note: The dust monitor PSL 102 has been alarming on and off all day. See attached screenshot for the trend for today. The thresholds are 70 for minor alarm and 100 for major for both particle sizes.
Betsy, Robert
When the IFO broke lock around 11am, it was decided that we should go clean the viewport window on the South side of the HAM1 chamber which the PSL beam enters (see pix of inspection prompting this at alog 30867). Travis lowered the power of the PSL via the rotation stage to 0.0 and we also locked out the rotation stage and the light pipe out on the floor. We then decoupled the light pipe from the HAM1 port and slid the unit back about a foot. We then proceeded to do a spray-on First Contact cleaning using the "canning cone" as described in procedure E1600263. We let it dry ~30 mins before pulling the sheet off, however 2 small fragments of FC tore off and remained on the window just below center. A second sheet was applied, but it again left a small fragment near the bottom of the window. This time I just painted a stripe across the fragment and pulled it in a 3rd attempt - Robert and I reconciled that this was low enough to be well out of the beam path if I left a streak. Lighting was poor and with laser goggles made for a difficult cleaning. Otherwise, the cone and procedure worked well. I'll add to spray more than 3 layers next time as this may have made for a more sucessful first pull.
Pix are of the 1st and 2nd FC sheet followed by the 3rd little stripe pull. The last picture is the PSL beam centering on the viewport. The beam goes through the viewport just below center, and we see a visible improvement of the scatter points in that area due to the cleaning(s). Note, there is ring of particulate outsid eof the FC sheet pull area, but this is covered by the lightpipe mounting plate which reduced the beam view to the window.
FAMIS Request 6869 There is a bump between 20 and 40 Hz in the spectra most clearly for HAM2, HAM5 and HAM6. The ITMY V3 trace is above the nominal.
Thanks Patrick. Jim and I are looking into the bumps in the HAM spectra. The ITMY noise isn't too alarming yet. It is good if the operator compares the current spectra with the previous; something I will do too.
Running some experiments with CP4 RE: noise. Set LLCV at 29% open in manual mode with bypass exhaust valve closed to see if signals settle down.
I reset the offset in PID to 32 (was 40) which is closer to nominal value after Dewar fill. I also adjusted the lower limit % open from 20 to 25 to avoid warming transfer line, since the LLCV likes to sit at lower limit in PI mode.
Comparing CP4 pump level in manual mode from June and now. Today is much noisier than back in June.
Here is CP3 trend before it failed last Dec.
Kiwamu saked the ops to run some TCS laser noise measurements.
SETUP:
Started the run:
TSC X - Initial Power = 0.2W TSC Y - Initial Power = 0.0W
| Time | Power | Time | Power | |
| 03:00 | 0.3W | 03:00 | 0.1W | |
| 04:30 | 0.4W | 04:30 | 0.2W | |
At 05:08 Lost lock due to a Mag5.8 EQ in Alaska.
I only managed to get one more data point for both arms:
15:30 utc: TCSx at 0.5W for 90 minutes.
TCSy at 0.3W for 90 minutes.
Oct 28, 10:03UTC, TCSX power set to 0.6, TCSY power set to .4
oct 28, 11:32UTC, change X from 0.6 to 0.7, changed y from 0.3 to 0.4
oct 28, 13:27UTC, tcsx raised to 0.8, tcsy raised to 0.5
As range dropped and arm signals got more noisy I feared H1 was about to lose lock, and touched up TMSX and TMSY alignment. Hopefully this didn't invalidate the data for TCS analysis.
Tweaks by TMS:
Tweaks and TCS changes by timeline:
15:05 UTC: TCSx at 0.9W for 45 min.
TCSy at 0.6W for 45 min.
At 4:43 UTC today (10/30, or (10/29 still PST)), after Robert left, I changed TCSY to .2W, per Cheryl's suggestion left with Corey. TCSX is still at .4W.
Below are plots comparing the kappas and cavity pole from LHO as computed in the GDS pipeline and the SLM tool. The data is from the end of a lock stretch, starting on October 24, 2016, at GPS time 1161341820, and lasting 4.5 hours. The agreement is very good for the most part, with the following exceptions:
1) kappa_c as computed by GDS is slightly larger than that computed by SLM.
2) The cavity pole as computed by GDS is smaller by about 2-3% (~10 Hz).
Below is a table of mean and standard deviation values for the data taken from GDS, SLM, and the ratio GDS / SLM:
SLM mean SLM std GDS mean GDS std ratio mean ratio std
Re(kappa_tst) 0.8920 0.0068 0.8915 0.0058 0.9995 0.0044
Im(kappa_tst) -0.0158 0.0039 -0.0145 0.0014 0.9725 1.0764
Re(kappa_pu) 0.8961 0.0080 0.8956 0.0059 0.9995 0.0067
Im(kappa_pu) -0.0050 0.0056 -0.0034 0.0022 0.1662 28.8601
kappa_c 1.1115 0.0094 1.1168 0.0087 1.0048 0.0078
f_c 354.2332 2.9296 345.0556 2.3106 0.9742 0.0104
Below is an updated table of mean and standard deviation values for the data taken from GDS, SLM, and the ratio GDS / SLM with imaginary parts rescaled by adding 1.0 (~the magnitude of the kappas):
SLM mean SLM std GDS mean GDS std ratio mean ratio std
Re(kappa_tst) 0.8920 0.0068 0.8915 0.0058 0.9995 0.0044
Im(kappa_tst) -0.0158 0.0039 -0.0145 0.0014 1.0014 0.0042
Re(kappa_pu) 0.8961 0.0080 0.8956 0.0059 0.9995 0.0067
Im(kappa_pu) -0.0050 0.0056 -0.0034 0.0022 1.0017 0.0061
kappa_c 1.1115 0.0094 1.1168 0.0087 1.0048 0.0078
f_c 354.2332 2.9296 345.0556 2.3106 0.9742 0.0104
Here are covariance matrices and correlation coefficient matrices between SLM and GDS:
Covariance Correlation
Re(kappa_tst)
1.0e-04 *
0.4618 0.3208 1.0000 0.8163
0.3208 0.3345 0.8163 1.0000
Im(kappa_tst)
1.0e-04 *
0.1507 0.0012 1.0000 0.0211
0.0012 0.0210 0.0211 1.0000
Re(kappa_pu)
1.0e-04 *
0.6385 0.3128 1.0000 0.6636
0.3128 0.3480 0.6636 1.0000
Im(kappa_pu)
1.0e-04 *
0.3140 -0.0036 1.0000 -0.0293
-0.0036 0.0495 -0.0293 1.0000
kappa_c
1.0e-04 *
0.8895 0.4464 1.0000 0.5464
0.4464 0.7502 0.5464 1.0000
f_c
8.5828 -0.0252 1.0000 -0.0037
-0.0252 5.3387 -0.0037 1.0000
Updated plots are attached as well.
For the record, Sheila saved the modified filter file on Oct 27 2016 at 16:55 PDT, or Oct 27 2016 23:55:00 UTC. She says she hit load on the filter banks individually "pretty much right after." I've now subsequently loaded the entire filter file from the GDS_TP screen on Fri Oct 28 2016 at 10:38:53 PDT (Oct 28 2016 17:38:53 UTC) The filter design string is ellip("BandStop",4,1,60,40.4,41.3)gain(1.12202) and lives in FM9. Also, I attach a comparison between calibrated DARM ASDs from last night's long lock stretch against one from several nights ago. The BW is a delightful 0.3 [mHz] -- hooray for IFO stability! The conclusion is a little different from Sheila's above conclusion: the PR2 R3 mode @ 40.93 Hz is not *gone*, but it has definitely been reduced by an order of magnitude. Interestingly, the 27.41 [Hz] V3 mode also is a reduced by a factor of 0.70. Indeed, there are other R3 modes now exposed at 40.8687, 40.8775, 40.9171, in addition to the residual of the PR2 mode at 40.9356 [Hz]. That being said, it looks like given the density of modes around 40.9, it'll be fine to use the same notch design for all HSTS. We'll successively notch the R3 mode out of every HSTS, and see what disappears. By looking at my 2014 comparison between LLO, LHO, and a Low Noise damping loop design, G1401291, at first glance since the filter only distorts the phase at 20 Hz by 2 [deg], we should have plenty phase margin to notch out this mode in every suspension. But do not that LHO still has a complete mess of a design -- pretty much all the SUS have different gains and filter designs. So, we'll do so with caution. Even more so if we want to notch the V3 mode.