Winds have started to avg up around 20mph site-wide (gusts on X-arm up to 40mph).  Might be dying down?

Range dropped down to 74Mpc with winds.

EY BSCISI Location monitor has had some big oscillations of +/-10,000nm over the last few minutes.  SUS EY on the Tidal FOM (nuc1) has some clear sinusoids recently, too.

From 11-11:30amPST, Air Handler MAJOR alarm for LVEA 2B ("as usual"?)

Attached are trends of useism & wind from August to present for E8/O1. 

MICROSEISM:  Clearly, useism has been growing with the season.  The worst storm was around 11/12 (but current one looks to be approaching that level, too).

WIND:  What made 11/12 storm worse was that it ALSO had winds over 40mph!  (For this current storm, winds have generally been under 10mph, BUT over the last few hours we had rain & now the winds are picking up to around 20mph (with an EX gust near 40mph). 

Will continue to monitor (the H1 range is running great at 78Mpc and no ETMy saturations thus far *knock on wood*).  And End Station ISIs look good with no ring-ups on the StripTool.

TITLE:  12/6 DAY Shift:  16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC     

STATE of H1:  NLN at 78Mpc

Outgoing Operator:  Jim

Quick Summary:

It's been 90min (chatted with Jim for first hour).  Great work on helping H1 ride through these extremely rough seas of ground motion!  Last night after reading Cheryl's alog about rung up ISI, I wanted to ask Jim:  

What is a rung up ISI?  

• So, a rung up ISI won't necessarily trip a watch dog.  
• Problem child here is mainly:  EX BSCISI Stage1 X
• It can ring up during rough seismic noise (like now).
• Symptom:  large sinusoidal motion for the End Station ISIs.  (+/- 10,000nanometers is bad!  5000nm is avg.  20000nm is worst observed)

Watch End Station Location Monitors:  I have a striptool up and I am watching H1:ISI-ETM[x & y]_ST1_CPS_[x & y]_LOCATIONMON.  The y-axis is set to +/- 15,000nm.  (signals currently about +/- 1000nm with not a very strong/visible sinusoid).

useism continues to be bad.  Looks like it reached its worse during Cheryl's EVE and continues to stay elevated (LVEA has had some data points above 2um/s; easily averaging 1.1um/s.)

If we drop out of lock, Jim says I should NOT have to do anything with the ISIs (let Guardian do its thing).  IF, I get a rung up EX, he says I could watch the EX Location Monitor, and wait for it to calm and then try enabling the X-direction 90mHz BLEND.  (but that's only an iffy proposition)

Basically, we are in one of those unique periods when seismic is noisy enough to push us into this out-of-norm SEI state.

O1 day 80

model restarts logged for Sat 05/Dec/2015 No restarts reported

Title: 12/5 owl Shift 8:00-16:00 UTC

State of H1: NLN

Shift Summary:Rough night, EX ISI was rung up (microseism? IDK), took several hours to get locked

Activity log:

Cheryl had no luck relocking earlier because the EX ISI was misbehaving. I spent several hours poking at it, I'm not sure the things I tried had any effect, but it's possible we want to start engaging the last couple of control loops (St2 RX/RY) on this ISI. ISS 2nd loop engagement was also an issue.

It's been a rough one so far. ETMX ISI was rung up when I came in. I've tried a bunch of things, I'm not sure what or IF I've fixed it. Currently, the Z sensor correction is running on the ISI and the RY loop is running on St2. I've switched everything back to nominal, I'll keep watching the ISI, but for now everything looks OK. Shifting the Z sensor correction was what I thought earlier was the fix, but when I got almost to NLN, EX ISI rang up and blew the lock. I just gotten to NLN I've now turned on the St2 RY isolation loop, and the ISI may have settled down, but I've been here before. The current St2 RY blend is a 750mhz blend that injects a lot of GS13 noise at low frequency and CPS noise at high frequency, so it's not ideal, and I have a hard time believing that this configuration is really necessary for the ISI's stability but it's difficult to argue with qualified success.

Attached are a few spectra of the EX ISI St2 sensors. First plot is the RX (blue), RY(brown) GS13s, with GS13 noise curve(black). You can see turning on the loop makes the microseism better by a little, but worse at the blend cross-over and at a couple hz. Maybe the high microseism is whats giving us problems? Next plot are the CPSs red is RX, green is RY, I kept GS13 noise in for scale. Again, microseism is suppressed, but GS13 noise is making the low frequency worse by almost an order of magnitude, below 70mhz.

Turning on the St2 RY loop looked like it settled the ISI down, but I've backed everything out, and I think I can go back to observing. The EX ISI still needs monitoring.

Ops Eve Summary: 00:01-08:00UTC (16:00-23:59PT)

State of H1: down, ETMX ISI is oscillating

Help: Keita and Vern

Incoming Operator: JimW, who's looking into the ISI now

Shift Summary:

• difficulties getting H1 to lock,
• but after an initial alignment,
• the DRMI did lock more than once,
• but woulnd't hold,
• the switch of ETMX ISI blend filters from (quiet90 to 45mHz),
• threw the ISI into oscillation, 
• and while those oscillations have at times appeared to be dampled,
• they came back and prevented locking,
• so I switched ETMX blend filters to  x dof = 45mHz, y dof = quite90,
• after remembering that Jim had done this with some success in the past,
• however this did not fix the oscillations either

Currently:

• useism at CS is at 1um/s and increased throughout this shift, and appears to still be increasing
• winds are below 5mph

According to alog 23420, "When useism is high, however, we have to use a 45mhz blends..." so I've changed all of them on ETMY and ETMX to 45mHz.  

Status is that all BSC ISI's are on all 45mHz blend filters.

DRMI has locked for the second time.  The first time was from 3:42-3:59UTC.  Will attempt to progress the lock toward Low Noise.

two plots attached: Dec. 1st and Dec. 5th - all while H1 is locked in Low Noise

Dec. 1st plot shows BS optical lever sum glitching by 200+ counts.

Dec. 5th plot of the same signals shows ETMY  optical lever sum glitching 50-70 counts, and ETMX optical lever sum gltiching 200+ counts, but BS sum is now quiet and +/-25 counts from the mean sum value.

Is this glitching, or an artifact of something else, and could this be effecting the IFO's locking?

TITLE:  12/5 DAY Shift:  16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC     

STATE of H1:  Down for last 4hrs

Incoming Operator:  Cheryl

Support:  Made a call to Keita (& Vern) to give them status/update

Quick Summary:     H1 great for first half of the shift and then down the 2nd half.  Have posted what I've done thus far.   useism was high 24hrs ago, went down a little and appears to be inching up again (see attached snapshot...I couldn't fix nuc5 such that it can be viewable online).  Cheryl was able to lock it up with similar conditions last night, so hope she can do what she did yesterday.

• 19:56UTC (11:56amPST) H1 dropped out & no obvious reason why.
• 19:58 - 20:30 Lock Acquisition Part 1
  • Problems getting through CHECK_IR (about 3-4 attempts), but finally made it past this step.
  • Tried locking DRMI, but alignment looked bad.  Tried locking PRMI, but no lock within 8min.  Started Initial Alignment (took about 23min).  Now giving Locking another go.
• 20:30-20:53 Initial Alignment
• 20:54 - current:  Lock Acquisition Part 2

TITLE:  12/5 DAY Shift:  16:00-00:00UTC (08:00-16:00PDT), all times posted in UTC     

STATE of H1:  NLN at 80Mpc

Outgoing Operator:  Jim

Quick Summary:  Icy drive in.  Going on 12+hrs of lock.  useism band is elevated to 0.7um/s for LVEA & winds are under 10mph.  Had an FMCS Air Handler MAJOR alarm for LVEA REHEAD 2B (think this guy has been alarming off and on for a week +; a known issue).  Ah, looks like L1 is joining us for some double coincidence time.

Continue to run with 45mHz Blends enabled, BUT with ETMx with 90mHz for x & y.

In 23939 Evan pointed out low frequency glitches. These look very similar to the scattering glitches seen at LLO every day (there likely driven by OM suspension motion). I think these gltiches at LHO are probably related to SRM or PRM optic motion for a few reasons. 

Figures 1 and 2 show the SNR/Freq plots from hveto of Strain and Mich, respectively. These both show a relationship between amplitude and SNR that is what you expect for driven fringes/shelves sticking out farther above the noise, the higher frequency they are driven to. 

Figures 3 and 4 show omega scans of Strain and Mich showing pretty clear arches. The arches are stronger in Mich than in Strain (in terms of SNR). 

Figures 5 and 6 show the fringe frequency prediction based on the velocity of the PRM and SRM optics. The period is about right for both. The results for other optics are shown here. The code is here. And the scattering summary page for this day is here. The dominant velocity looks like about 0.15Hz judged by eye from the timeseries. 

Figure 7 shows that during the glitchy times (green and yellow) the SRM and PRM optics are moving more at about 0.12Hz (probably compatible with the largest velocity frequency above). There's also a pretty strong 0.6Hz resonance in PRM, but this is the same in good and bad times.