TITLE: 10/17 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Aquisition
INCOMING OPERATOR: Nutsinee
SHIFT SUMMARY: Lost lock a few times just after getting to NLN or just after powerup, not really sure why (once was me trying to adjust the ISS diffracted power too late in the game). Been locked for 4hours, commissioners hard at work.
LOG:

• 15:50 - Bubba, John to mids.
• 16:49 - Bubba, John back
• 17:30 - Jim W to EX to check on wind fence
• 20:52:52 - Kyle starting pump at EX (WP#6221)
• 21:08 - Kyle test complete.
• 21:19 - Kyle to CP3
• 21:30 - Kyle back.

J. Kissel for S. Karki

I've changed the > 1 kHz PCALX calibration line frequency, a.k.a. the "long duration sweep" line, from 2501.3 to 2001.3 Hz. Recall this started moving again on Oct 6th (see LHO aLOG 30269) I report the progress towards completing the sweep below. 

Frequency    Planned Amplitude        Planned Duration      Actual Amplitude    Start Time                 Stop Time                    Achieved Duration
(Hz)         (ct)                     (hh:mm)                   (ct)               (UTC)                    (UTC)                         (hh:mm)
---------------------------------------------------------------------------------------------------------------------------------------------------------
1001.3       35k                      02:00      
1501.3       35k                      02:00     
2001.3       35k                      02:00                   39322.0           Oct 17 2016 21:22:03 UTC
2501.3       35k                      05:00                   39322.0           Oct 12 2016 03:20:41 UTC    Oct 17 2016 21:22:03 UTC      days
3001.3       35k                      05:00                   39322.0           Oct 06 2016 18:39:26 UTC    Oct 12 2016 03:20:41 UTC      days
3501.3       35k                      05:00                   39322.0           Jul 06 2016 18:56:13 UTC    Oct 06 2016 18:39:26 UTC      months
4001.3       40k                      10:00
4301.3       40k                      10:00       
4501.3       40k                      10:00
4801.3       40k                      10:00  
5001.3       40k                      10:00

LN2 @ exhaust in 60 seconds after opening LLCV bypass valve 1/2 turn -> closed LLCV bypass valve. 

Next over-fill to be Wednesday, Oct. 19th.  

WP#6221

While locked in Low Noise, Kyle headed to EX to start and stop a pump in two 5 min intervals. The pump is connect to the North side of BSC5.

Times in UTC (GPS):

Start1 - 20:52:52 (1160772789)

Stop1 - 20:57:52 (1160773089)

Start2 - 21:02:52 (1160773389)

Stop2 - 21:07:52 (1160773689)

The purpose of this test is to determine if these pumps can be run without interferring with commissioners.

The Mid station chillers were turned off today and will likely remain off until March or so when the warmer weather returns.

Some recent locks have had steeply downward-trending ranges, which seem to be due to a steady increase in jitter coupling.

I hadn't seen anyone say it explicitly, so I decided to check the cause of one of these drops in range. I picked the lock on Oct 15, where the detector was in intent mode around 19:30, and the range had dropped 20 Mpc by 20:30. I ran Bruco at this later time (Bruco results page).

Above 200 Hz, all the coherences are with ISS PDB, IMC WFS, and the like, suggesting that jitter coupling is steadily increasing (and I think there's no feedforward because of issues with the DBB). Attached are the h(t) spectrum and the change in coherence with PDB relative to the start of the lock - the spectrum of PDB and the WFS don't change.

No restarts reported over these 4 days.

Weekly Xtal - graphs show some strange power fluctuations in Amp diode powers starting on or around the 10th. Also, this can be seen in the OSC_DB4_PWR graph as well.

Weekly Laser - Osc Box Humidity reached a high point at about the same time (10th) but seems to have started an upward trend sometime between the 8th and the 9th. PMC Trans power looks pretty erratic.  Included is a zoomed view of the Osc box humidity and the OSC Box Temp just for correlative purpose.

Weekly Env - nothing notable. 

Weekly Chiller - some marginal downward trends in headflow for heads 1-3. Head 4 is eother crazy stable and good OR this data is trash. ??

I went to EX this morning to check on the wind fence after Friday's wind storm. The fence is still there, intact, and hasn't accumulated any tumbleweeds, which is one of the concerns Robert had about a fence. However, a couple of the posts have been twisted, probably by the wind load and moisture, and all of the poured concrete footings have started creeping in the sand. I dont think there is any danger of the fence collapsing, yet, but I'll keep an eye on this.

Attached photos are: a picture of the total coverage from a month or two back (this hasn't changed), a picture showing the worst twisted post (this is new, I didn't notice this the last time I looked) and a picture of the gap in the sand around one of the footings (not new, but it's been getting bigger).

Laser Status:
SysStat is good
Front End Power is 34.67W (should be around 30 W)
Front End Watch is GREEN
HPO Watch is GREEN
PMC:
It has been locked 0.0 days, 0.0 hr 48.0 minutes (should be days/weeks)
Reflected power is 33.57Watts and PowerSum = 126.8Watts.

FSS:
It has been locked for 0.0 days 0.0 hr and 42.0 min (should be days/weeks)
TPD[V] = 3.225V (min 0.9V)

ISS:
The diffracted power is around 6.695% (should be 5-9%)
Last saturation event was 0.0 days 0.0 hours and 51.0 minutes ago (should be days/weeks)

Possible Issues:
PMC reflected power is high
ISS diffracted power is High (This seems to pop up after power increases)

SEI - Testing out some new configurations to get ready for O2.

SUS - No report

CDS - Running (go catch it. Ha.)

PSL/TCS - All good

Vac - Kyle wants to do test with pumps at end stations with locked IFO.

Fac - RO system issues, but it is back and running.

Maintenance

CDS - FRS's to address, cable pulling, power up RGAs at ends.

PCal - Travis to do some work.

Looking at the coupling of carrier jitter with misaligned RF sidebands in REFL:

Jitter (alog 30237): 10^-6/√Hz (level) to n x 10^-4/√Hz (peaks)
IMC suppression (alog 30124): ~¹⁄200
⇒ at IFO: 5 x 10^-9/√Hz to ⁿ⁄2 x 10^-6/√Hz

Fixed misalignment of RF sidebands: Δα < 0.3
DC power in reflection with unlocked ifo at 50W: REFL_DC^unlocked ~ 300 mW
Error offset in REFL = jitter * REFL_DC^unlocked * Δα
⇒ 5 x 10^-9/√Hz  * 0.3 W * 0.1 ~ 1.5 x 10^-10 W/√Hz (low)
⇒ ⁿ⁄2 x 10^-6/√Hz * 0.3 W * 0.3 ~ ⁿ⁄2 x 10^-7/√Hz (high)

Frequency noise coupling into DARM (alog 29893):
⇒10^-10 m/W at 1kHz (approx. f-slope)

at 1kHz: 10^-20 m to 10^-17 m
at 300 Hz: n x 10^-18 m (high) with periscope peak n ~ 4.

TITLE: 10/17 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Aquisition
OUTGOING OPERATOR: Patrick
CURRENT ENVIRONMENT:
    Wind: 45mph Gusts, 27mph 5min avg
    Primary useism: 0.08 μm/s
    Secondary useism: 0.36 μm/s
QUICK SUMMARY: As I took a seat in the chair, a large gust of wind could be heard from in the control and then lockloss...

 

Left in down while the earthquake subsided. Had a hard time getting through an initial alignment. The IMC kept losing lock in INPUT_ALIGN and PRM_ALIGN. Not certain what finally allowed it to stay locked long enough to get through these states. ISS and FSS still losing lock, but recovered on their own each time. IFO is in NLN but range has been dropping steadily.

Starting shift with 6.9 magnitude earthquake reported 78km WNW of Kandrian, Papua New Guinea at 06:14:58 UTC. Jeff B. has put ISC_LOCK in down.
09:57 UTC Earthquake has subsided but wind is increasing
10:00 UTC Starting attempting to lock. Changed ISI config from EARTH_QUAKE_V2 to WINDY.
10:04 UTC Paused at LOCKING_ARMS_GREEN. Both are less than 1 on WFS. X is kind of jittery. No apparent glitches of ALS PDH control signals. Node is still waiting for arms to settle, won't proceed to locking ALS. Reluctantly moving TMS Pitch. Started with TMSX 67.8 and TMSY 127.5. This cleared the waiting for arms to settle message and allowed moving on.
10:25 UTC Lock loss waiting for DRMI ASC to converge
10:44 UTC Lock loss right after CARM_5PM. ISS in oscillation. Recovered on its own after about 140 sec.
10:48 UTC Lock loss during LOCKING_ALS.
10:51 UTC Lock loss during LOCKING_ALS.
11:03 UTC Check IR signals not stable. Starting to hear wind on building.
11:07 UTC Put in down
11:12 UTC Try locking again
11:27 UTC Lock loss at CARM_5PM
11:28 UTC Put in down
11:45 UTC Starting initial alignment
ALS X arm randomly dropping out of lock. MC not stable on input align. Put IMC_LOCK to down. IMC_LOCK is in down, but IMC still seems to be trying to lock?
12:30 UTC Finally got to INPUT_ALIGN. Waiting for ASC convergence.
Initial alignment past locking arms green seems to make IMC quite unstable.
12:54 UTC Initial alignment done
13:25 UTC NLN

   Posted HEPI pump Trends (FAMIS #4525). 

   Pressures for the 4 CS pump stations are flat around 100. The control voltage shows some fluctuations during the period, however day 1 and day 45 values are within a few 10ths of each other.

   Both end stations pressures and voltages are, by comparison, somewhat noisy. End X max pressure and min difference for the end points is 0.2. For End Y this same difference is 0.1. Between the measurement end points there is a more noise in both the min and max values. There is no apparent pattern to the fluctuations.             

J. Kissel, D. MacLeod

Duncan had noticed that Omicron triggers for the H1 PCAL Y RX PD (H1:CAL-PCALY_RX_PD_OUT_DQ) had failed on Oct 13 02:51 UTC (Oct 12 18:51 PDT) because it was receiving too many triggers. 

Worried that it might have been a result of the recent changes in calibration line amplitudes (LHO aLOG 30476) or the restoration of the 1083.7 kHz line (LHO aLOG 30499), I've trended the output of the optical follower servo, making sure that it has not saturated, and/or is not constantly glitching.

Attached is a 3 day and 30 day trend.

There is indeed a feature in the trend at Oct 13 02:51 UTC, but it is uncorrelated in time with the two changes mentioned above. Indeed, the longer trend shows that the OFS has been glitching semi-regularly for at least 30 days. I'll have Detchar investigate whether any of these correspond with heightened period of glitching in DARM, but as of yet, I'm not sure we can say that this glitching in a problem.