Keita Daniel

We were able to engage the new ISS with the most recent modifications, see alog 29570. The offset adjustment is very finicky. Trying to run with high ISS gain at low input power requires offset adjustments below the 0.1 count level as function of the gain value. We decided to leave the ISS gain fixed at 5 dB and set the offset through the 3rd loop filter module to 25.5 (or near there). This yields a unity gain frequency around 200 Hz. Ramping the power up to 50 W will then move the ugf up to about 4 kHz.

The first plot shows the transfer functions at 2.1 W (red), 50 W (blue) and 50 W with the boost engaged (green). The ISS gain was 5 dB for all measurements.

The second plot shows the PSD calibrated in RIN/√Hz. The red trace shows the error point which has not been corrected for the AC coupling, whereas the magenta trace shows the sixth PD (hooked up to channel 2). Both traces were taken at 50 W without boost. The black trace shows the error point at 2 W. The amber and dark blue traces show the RIN without the outer loop engaged. The dark blue trace is limited by ADC noise above 2 kHz. The ISS gain was again fixed at 5 dB.

Title:  09/12/2016, Day Shift 15:00 – 23:00 (08:00 –16:00) All times in UTC (PT)
State of H1: IFO is unlocked. Working on recovery after power outage.  
Commissioning: Daniel and Keita working ISS Second Loop
Outgoing Operator:  N/A
 
Activity Log: All Times in UTC (PT)

15:00 (08:00) Start of shift
15:27 (08:27) Filiberto – LVEA PSL rack and HAM2 installing ISS Second Loop chassis
15:51 (08:51) Karen – Going into the LVEA to do a walk through 
15:51 (08:51) Christina – Going to Mid-X for cleaning
15:56 (08:56) Filiberto – Finished in LVEA 
15:57 (08:57) Jason – Going into the LVEA to reset the Noise Eater
16:36 (09:37) Filiberto – Going into LVEA to work on ISS Second Loop chassis
16:49 (09:49) Filiberto – Out of the LVEA
17:00 (10:00) Jeff B. – Going to both End Stations to check dust monitors 
17:08 (10:08) Filiberto – Going into the LVEA to reinstall ISS Second Loop chassis
17:29 (10:29) Filiberto – Out of LVEA
18:00 (11:00 ) Jeff B. – Back from End Stations 
18:08 (11:08) TJ – Resetting Guardian nodes to correct problem apparently from power outage
20:44 (13:44) Filiberto – Going into LVEA to swap the ISS Second Loop chassis
21:05 (14:05) Filiberto – Out of LVEA


Title: 09/12/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
Support: Sheila, Jenne, Dave, Richard, Carlos, TJ   
Incoming Operator: N/A

Shift Detail Summary:  Large dust storm in the area. Sorting out various problems after the power outage. Ran through an initial alignment. Commissioners working or relocking after the power outage.  

I have turned some of the heaters up in the LVEA. Heaters 1A, 1B, 4C, and 5C have all been increased by 1ma each.

PSL: 
SysStat: All Green, except VB program offline 
Frontend Output power: 34.9W  
Frontend Watch: Green
HPO Watch: Green

PMC:
Locked: 0 days, 3 hours, 9 minutes
Reflected power:   174.6W
Transmitted power: 119.1W 
Total Power:       293.6W 

ISS:
Diffracted power: 3.1%
Last saturation event: 0 days, 0 hours, 22 minutes 

FSS:
Locked: 0 days, 0 hours, 22 minutes
Trans PD: 4.401V
 

Because the old filters are so dense that they let water though very slowly, I swapped them out for brand new ones. I ran clean chiller water though both filters couple of times before I put them in. Below I attached a picture comparing one of the old filters to a new one.

WP6149 New h1susprocpi model installed followed by DAQ restart.

Laser Status:
SysStat is good
Front End power is 34.9W (should be around 30 W)
Frontend Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 0.0 days, 0.0 hr 31.0 minutes (should be days/weeks)
Reflected power is 174.5Watts and PowerSum = 292.0Watts.

FSS:
It has been locked for 0.0 days 0.0 h and 17.0 min (should be days/weeks)
TPD[V] = 4.372V (min 0.9V)

ISS:
The diffracted power is around 3.448% (should be 5-9%)
Last saturation event was 0.0 days 0.0 hours and 17.0 minutes ago (should be days/weeks)

Possible Issues:
PMC has not been locked for very long
PMC reflected power is high
FSS has not been locked for very long
ISS diffracted power is Low

Durring some of out unsucsesfull locking attempts last night we had the drift of PR3 durring the CARM offset reduction that we originally used the Ballmer offset to coutneract. (20055)

We had commented this out a few months ago because it was too large of a correction, but this morning I added it back and reduced it by a factor of 2 (the offset is now 0.25 in M1 P2P which causes about 0.02 urad of pitch).  

   While investigating high particle counts at End-X, found the vacuum pump came up in reverse direction after the power outage.I reset the pump and adjusted the by-pass air. Ran Zero Count and Flow test, and all appears OK. 

   Checked End-Y. Found and fixed the same problem. Checked the CS as well. Since it is on a 3-phase circuit the pump did not restart in reverse. 

   Looking into making the power recovery of the vacuum pumps more robust.      

Josh, Andy

We noticed that the OMC is moving longitudinally by almost 100 microns between the 50 and 35 Watt locks overnight. It also moves after the other changes in power. The first plot shows the position as a function of power. We were curious whether there is a servo responsible for this, or if it's unintended, like a thermal effect. Is there a slow servo moving the OMC to maximize gain, that shifts the position as the IFO thermalizes?

The second plot zooms in on the time of the change down from 50 Watts. The OMC is stable during most of the lock, but then starts moving before the power is changed. Five minutes after the change, it starts moving in the opposite direction. Is it understood why it seems like it was starting to run away?

For reference, the trend plot for the various cooling circuit parameters is attached.

    No clear signs of hardening of the arteries.



Jason/Peter

Happened on Saturday, forgot to log it.

450 ml for TCSX chiller

670 ml for TCSY chiller

Also cleaned both filters.

Note on power glitch: CO2 tripped as expected since h1oaf0 was down but h1hwsmsr computer didn't trip so both HWSX and HWSY codes were still running.

Side note: Matt mentioned that he couldn't find an instruction on how to restart the HWS code. That instruction can be found here.

SEI: Had trouble restoring CS HEPI after power outage. Hugh is investigating cause.

SUS: No report.

CDS: Recovery from power outage appears OK. Filiberto will be working on the ISS Second Loop chassis.
 
PSL: No chiller trips since swapping in the backup chiller. Old chiller is being moved into the mechanical building for testing and repair.
During the power outage the PMC Refl power meter was damage. A replacement is being looked into.

VAC: All appears OK after the power outage. Gerardo is looking into a problem with the Mid-X gauge for IP-10.

FAC: Restarted various systems after the power outage.

Reviewed Tuesdays pending work permits.   

During the power outage recovery, Nutsinee had difficulty getting the HEPI Pump Servo to not fault out in the corner station.  We traced that to the level continuing to trip so she and Sheila lowered the level sensor on the reservoir.  The servo managed fine after that.  This morning the level is less than 1/16" lower than my latest level reading from last Tuesday.  It is cooler today and this fluctuation is within typical temperature fluctuations. So, I don't suspect a leak although I will visually check all the lines for signs of a leak tomorrow.  Neither do I suspect an accumulator leak although the abrupt pressure shift from the outage may have jarred the gas charge side schraeder valve.  I would be more inclined to suggest an air buble that was caught somewhere finally managed to burp its way out lowering the volume level.  And finally, since the level sensor setting is invasive and blind, I likely had it set very close to the trip point and Nutsinee suffered the worst of it.

Evan, Sheila

Since the power reduction from 50W to 35W at about 2:25 UTC Sept 11, we have been sitting with the IFO mostly undistured other than changes to PI damping.  We have not been in low noise (no ISS second loop, we are still on the high noise ESD driver), but we have seen some hugh noise in DARM that looks like a fringe wrapping shelf.  We reduced the power again at 3:46 UTC, and the noise got better and went away after 10s of mintes.  

We don't see anything in our LSC loops or main ASC loops that had a similar shape, do the detchar fringe wrapping/scattering tools offer any clues? Especially at the beinging of this time window, there is a lot of noise in DARM (a high frequency comb) which is due to a rung up PI mode. 

Came in to find the laser had tripped, presumably because of the site-wide power glitch.
Brought laser back.  Everything seems to be okay.  However both the reflected power and
the power sum measurement reported by the MEDM screen are out of whack.  It might be that
the power glitch fried the reflected power power meter similar to what happened the last
time power to the site went out - it took out the power meter in the external shutter.
The power sum might be a problem with the photodiode.

    Both might require restoration of the calibration factors from the snap files.