Reconfigure x1fs0 to export individual directories under /opt, rearrange nfs mounts for front ends, x1boot, and x1 DAQ computers.  This is to test proposed changes for the h1 system.

SHIFT SUMMARY: Some locking success in the morning, but trouble in the afternoon with high winds and microseism. Jim W. tried putting the end stations on Quite_90 and enabling sensor correction. Ed took over locking attempts in the mid afternoon. The winds have come back down.

ACTIVITY LOG:
19:59 UTC Jeff B. and Nicole W. to LVEA to look at 3IFO baffles
20:06 UTC Stopping locking attempts while Jim W. runs transfer functions on ETMX
20:36 UTC Jeff B. and Nicole W. done
20:48 UTC Phone call from Hanford Emergency instructing personnel in 200 West to take cover
21:38 UTC Phone call from Hanford Emergency reporting the lifting of the take cover alarm
21:44 UTC Dick G. to optics lab
21:45 UTC Resuming locking attempts. Jim W. has put the end stations on Quite_90 and turned on sensor correction.
23:35 UTC Gerardo to mid X to retrieve empty tote
23:54 UTC Filiberto to mid X to check alarm on fire panel

Tour group in the control room around 19:50 UTC
Dave B. changed the vacuum overview medm on video1

Fixed bug: Previously, when Verbal could not connect to a channel through ezca, it would crash with an EzcaConnectError. Now it will make a small noise and write a notification that it cannot connect to the channel and repeat. This will begin to get very useful now that we are in the commission era.

Saturations will now just say the optic name.

I also removed the acknowledgement feature for the CW inj. It should still alert if the inj status changes, but operators do not have to acknowledge.

I included the coating thermal noise (CTN) in the estimate made in entry 25039, and find that this changes little the conclusion.  It seems that the unidentified noise source has a slope close to 1/f.  Increasing the CTN estimate by 1.4 changes the conclusion, in that noise is more like 1/f^2.  I do NOT mean to suggest that this indicates higher CTN; that extra junk could be anything.  What this does mean is that we cannot use H1 to set a better limit than this (yet).

uSeism is approaching 1um/s and the winds have dies down to below 10mph.

WP5692 FRS4202

John, Kye, Gerardo, Dave:

I have modified the H0 vacuum overview screen to show an alarm border around bar monitor widgets. If the widet has no content, the alarm color is now visible in the border.

Jim's testing some alternate filter on the ETM senscor Match filters for the beam line axis.  Leave the SDF red for SEI reminder of this.  If needing to green sdf for observation mode, please accept rather than reverting the settings on these.  Many thanks, TeamSEI.

We received a phone call in the control room at 12:48 PST from Hanford Emergency instructing personnel in 200 West to take cover and close all doors and ventilation. Other personnel are instructed to stay clear.

Richard M. informs me that this does not affect us (other than to stay clear of 200 West).

Summary: most coupling at LHO was measured to be about the same as for the pre-run injections. Magnetic coupling was found to be lower in the CS ebay, and vibration coupling was found to be lower at the PSL periscope and at EX, as we were expecting. Since changes were for the better, we conservatively use the values from the start of the run and nothing has to change in estimates of noise from the environment. I also injected at locations we didn’t reach during the first round; there is low but interesting acoustic coupling at both mid-stations.

We make an abbreviated set of injections at the end of the run in case coupling changed after the pre-run injections (link to pre-run injection summary: Link). We made at least one magnetic and one acoustic injection in the LVEA, the 3 electronics bays, the two VEAs and the PSL. These were designed to show if any coupling changed significantly, in which case we would investigate using further injections.  For O1 end-of-run injections, all significant changes were improvements, so we change no estimates, and do not alter the coupling functions and estimated ambient levels from the beginning of the run.

In addition, we made several injections that were planned but that we did not get to in the September round. These included shaking of ETMX and Y, and of the beam tube at the mid station.

Vibration coupling at mid-station

The smallest clear aperture in the beam tube between the corner and end stations is associated with the mid-station cryopumps. For this reason, the beam tube is instrumented with accelerometers at the mid-stations. We first injected at the mid-station during the current round of PEM injections because of time limitations during the first round.

Shaker sweeps on the beam tubes revealed several sensitive frequencies, possibly resonances of scattering structures. Figure 1 shows a comb injection at MX with one of the lines centered on a putative resonance. The feature in DARM has the side-band structure that is typically produced by scattering coupling.  The acoustic line at 130 Hz is about 3 orders of magnitude above background, which was also the approximate excitation level needed to produce features in DARM at several other frequencies at MX (250, 315 & 170 Hz) and MY (150 Hz).

While the normal acoustic levels at the mid stations are not a problem, it is not difficult to increase the sound pressure level by 3 orders of magnitude. A loud bang in a mid-station VEA may show in DARM, as might bumping into the beam tube. I suggest that we emphasize that when we are in observation mode, we record in the log when people are working in the VEAs at the mid stations.

Shaking of ETMX and Y

I used piezo shakers mounted on the blue cross beams of the ETM BSCs. This increased the amplitude of motion by about 2 orders of magnitude between about 100 and 1800 Hz. No effect was noted in DARM.

Reduced magnetic coupling in CS electronics bay.

For pre-O1 PEM injections, the only magnetic coupling that would prevent us from reaching our sensitivity goals was magnetic coupling in the corner station electronics bay (Link).  The coupling function was not the highest, but in combination with the high magnetic noise level in the ebay, the pre-O1 coupling would limit us to about 1e-18m/sqrt(Hz) at 12 Hz. However, Figure 2 shows that this coupling was found to be greatly reduced during the post-O1 injections. It is not clear when this improvement was made, but Richard remembered several activities in the ebay that could have improved cable shield connections etc., during the two weeks between when the measurements were made and the start of the run. 

Reduced acoustic coupling at EX.

We expected that the high acoustic coupling measured at EX (Link) would be reduced when the beam diverter was finally closed (Link) on Oct. 6. Post run injections showed that it was indeed reduced by a factor of about 5 in the 50-120 Hz region.

Reduced coupling at PSL

The coupling in the PSL was changed Oct. 13 2015 when I epoxied the top mount on the periscope and fine tuned the peak frequencies using weights. This removed peaks around 300 Hz from DARM (Link). Figure 3 shows the new estimated levels of ambient noise. One peak is very near showing in DARM, but we hope that reductions in jitter coupling, towards the level at LLO, will keep this from limiting us.

There are two channels alarming high for the temperature of the supplied air to the LVEA from air handlers 1 and 2. H0:FMC-CS_LVEA_REHEAT_1B_DEGF and H0:FMC-CS_LVEA_REHEAT_4_DEGF have both exceeded their alarm level of 100 deg F. Trends for the past 7 days are attached. John has been notified.

Sometime between last night and today, foton seems to have become unable to generate certain elliptic filters of high order.

For example: choose elliptic band pass, first frequency 5 Hz, second frequency 500 Hz, fifth order, 1 dB ripple. Foton freezes as soon as you click ok. Same for a sixth-order elliptic bandpass, and a fifth-order elliptic low-pass.

Last night, we were able to generate fifth-order elliptic filters no problem. What happened between then and now?

[Sheila, Evan, Gabriele]

The goal is to cancel the PRCL length chane induced by driving MICH using only the BS. For this reason we plan to implement a path from MICH control signal to PR2.

1. we injected a MICH motion using a differential drive on the two ITMs, and a PRCL motion using a common drive on the two ITMs. The PRCL error signal (POP_9I) sees the common mode about 20 times more than the differential mode. So we conclude that POP-9I sees MICH about a factoir 20 less than PRCL. It's therefore a good reference to disentangle MICH and PRCL in the BS drive
2. we injected broad band noise in tBS and measured the transfer function to POP_9I. Let's call this transfer function TF_POP_BS. This measures how much PRCL we do when we drive BS
3. we injected broad band noise in PR2 and measured the transfer function to POP_9I. Let's call this transfer function TF_POP_PR2.
4. we fit the ratio TF_POP_BS / TF_POP_PR2 with a 6th order filter (see figure) and implemented this filter in the PR2 ISC input filter banks. We set the driving matrix to send MICH to PR2, and activated the filter

We checked the result with a MICH line at 132 Hz: when the compensation is on, the line amplitude in the PRCL error signal is reduced by at least a factor 10, as expected from the fit residual (figure 2).

We're not leaving this in the guardian.

Mid-SHIFT SUMMARY:

• IFO Locked at NLN 78Mpc 02:57UTC

• Commissioners working 54Mpc

• SDF is LIT up Red. Sheila mentioned that it probably hasn’t been cleared since the power outage?

• µSei Z-axis is riding above the 90%ile. EQ bands are ≈.08µm/s. Winds are ≤15mph

Evan, Kiwamu,

As some of us have already noticed, there is a broadband noise with a 1/f^{0.5} shape in frequency from 60 to 200 Hz. This noise is unidentified.

Do not believe any statements in this report until futher analaysis. Something is fishy with the claibration of the cross-spectrum.

We are planing to check how stable this noise level is over the course of the entire O1.

The below shows an example spectrum of DARM.

Blue curves are twenty spectra of DARM (aka C01 frame, converted into displacement), each of which is made by the Pwelch with Hanning, detrended, 50% overwrap for a 12 minutes time series. The data starts at a GPS time of 1134604817. Green curves are the square-root of twenty cross-power-spectra of DCPD A and B which are reconstructed from the sum and null streams of the DCPDs. The DARM suppression effect was removed from the sum signal. The cross-spectra are then calibrated to the displacement using the latest O1 DARM model of the calibration group. No time varying correction (i.e. kappas) is applied. Red line is a 1/f^{0.5} line to show how steep the slope of the green curves is. I also attach the fig file.

Corey, Adam,

We're just about to start a detchar safety injection.

**Short version: Increased RY input motion (maybe HEPI, maybe wind/ground) causes ISI X loops to ring up when running 45mhz blends. The suspension/tidal is not the cause. The 90mhz blends seem to be immune to this. Other than using 90mhz blends, I'm not sure how to fix the ISI's configuration, short term to prevent the ISI from ringing up. But we should put a StripTool of the end station ISI St1 CPS locationmons somewhere in the control room so operators can see when ground tilt has rung up an ISI. Alternatively, we could add a notification to VerbalAlarms or the DIAG node when an ISI has been moving something like 10 microns peak to peak for several minutes.

This morning while the IFO was down for maintenance, Evan and I looked at ETMX to see if we could figure out what is causing the ISI to ring up. First we tried driving the L1 stage of the quad to see if some tidal or suspension drive was the cause. This did not have on the ISI, so I tried driving on HEPI. When I drove HEPI X, the ISI rang up a bit, but no more than expected with the gain peaking of the 45mhz blends. When I drove HEPI in RY, however, the ISI immediately rang up in X, and continued to ring for several minutes after I turned the excitation off. The attached image shows the ISI CPS X(red), RY (blue), HEPI IPS RY(green) and X (magenta). The excitation is visible in the left middle of the green trace, also visible in the sudden increase in the red trace. I only ran the excitation for 300 seconds (from about 1134243600 to 1134243900), but the ISI rang for twice that. After the ISI settled down I switched the blends to the 90mhz blends and drove HEPI RY again. The ISI moved more in X but it never rang up even after I increaed the drive by a factor of 5. The second plot shows the whole time series, same color key. The large CPS X motion (with barely noticeable increase in the IPS RY) is the oscillation with the 45mhz blend , the larger signal on the IPS RY (with small increase in CPS X) is with 90mhz blends. The filter I used for each excitation was zpk([0 0],[ .01 .01 .05 .05], 15111).