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?

TITLE: Jan 21 EVE Shift 00:00-07:11UTC (16:00-23:11:00 PDT), all times posted in UTC

STATE Of H1: Down

SUPPORT: Sheila,Evan, Gabriele

INCOMING OPERATOR: N/A

SHIFT SUMMARY:

• IFO Locked re-locked for commissioning ≈ 5 times

• Last lock of the night is hopefully going to be a keeper. Sheila and I are going to try to get the SDF cleared for Observing mode. She suggests that the safe.snaps probably need to be updated.

• Ezca Connection error ≈ 07:00UTC caused lockloss when Sheila attempted to clear it.

• No one home at Livingston. We’re checking out (07:11UTC)

We have a lot of out of date safe.snaps, which mean that after our power outage we have a lot of red on sdf, which Ed and I have spent some time fixing but there is still a lot to go.

UPdating safe.snaps would help make the next power outage recovery easier. 

We are going to leave the IFO in down and hope to sort out SDF in the morning. 

[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

STATE OF H1: Relocking
SHIFT SUMMARY: Moved RM1 and RM2. Ran initial alignment. Obtained first lock at NLN since power outage. Lost lock shortly afterwards to a 6.6 magnitude earthquake in Mexico (see attached). Earthquake took about 5 hours to ring down. Manually damped ITMX and ITMY roll modes.
SUPPORT: Jenne, Evan, Sheila
INCOMING OPERATOR: Ed

ACTIVITY LOG:
17:02 UTC Bubba and Chris into end X mechanical room to lubricate fans (WP 5685)
17:45 UTC Bubba back from from end X
18:47 UTC Bubba and Chris to end Y mechanical room to lubricate fans (WP 5685)
19:18 UTC Rick and Liyuan to LVEA and optics lab to look for optics
20:11 UTC Rick and Liyuan done
20:30 UTC Filiberto to Y2-8 to check on solar powered battery charge
21:05 UTC Kyle to end X air handling room to take measurements for building a stand for the ion pump
22:08 UTC Filiberto done at Y2-8 and going to X2-8
22:19 UTC Kyle back
22:21 UTC Dick G. to LVEA to look at RF racks
22:53 UTC Jeff B. to optics lab to work on dust monitors
22:59 UTC Filiberto done at X2-8
23:04 UTC Nutsinee and Jim B. to end Y VEA to turn on HWS
23:19 UTC The tidal common length integrator limits (H1:LSC-X_COMM_CTRL_LIMIT, H1:LSC-Y_COMM_CTRL_LIMIT) were being reached. Evan had me change them from 10 to 20.
23:27 UTC Nutsinee and Jim B. back
23:30 UTC Dick G. back
23:33 UTC Jeff B. back. He turned off the dust monitors in the optics labs.
00:34 UTC Kyle to mid Y to overfill CP3

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).