model restarts logged for Mon 04/Aug/2014
2014_08_04 12:39 h1lsc
2014_08_04 12:42 h1lsc
2014_08_04 12:45 h1broadcast0
2014_08_04 12:45 h1dc0
2014_08_04 12:45 h1fw0
2014_08_04 12:45 h1fw1
2014_08_04 12:45 h1nds0
2014_08_04 12:45 h1nds1

no unexpected restarts. LSC ipc work plus related DAQ restart.

[Jeff Arnaud]

Tonight we balanced the coils of the lower stages of MC2 SRM and SR2. The MC2 notes attached are explaining the procedure in detail. Below is summarized the ASD ratio after/before the exercise for each suspension and each level.
For some reason M3 stage of SR2 was harder to balance than the other ones, so we gave up on it for now and will come back to it later.

And the gains which were found optimum for each coils

Measurements will be running overnight to measure the cross couplings transfer functions for SR2 SRM and MC2

After BS and ITMY results, attached are itmx tfs ran over the week end, after doors closeout. During the measurement ISI was damped. Results look good. Lower stages show factor of two-ish discrepancy with model as Jeff pointed out.

1. Undamped H1 ITMX M0-M0 tfs compared with fiber model
2. Undamped H1 ITMX R0-R0 tfs compared with thincp model
3. M0 undamp R0 damp H1 ITMX L1-L1 tfs compared with fiber model
4. M0 undamp R0 damp H1 ITMX L2-L2 tfs compared with fiber model
4. H1 ITMX M0-M0 tfs compared with other ITMs
5. H1 ITMX L1-L1 tfs compared with Livingston's ITMX
6. H1 ITMX L2-L2 tfs compared with Livingston's ITMX

Data and scripts were commited to the svn

Today I have been working on porting the ESD Charging measurement automation scripts that Bryan Barr et. al. created at LLO. This has now been completed. I am adding some modifications to make the code more general.
I have run the code over all the ESD quadrants on the only mass in vacuum (ETMY) and for several offset values with excitation signal at 4Hz and amplitude of 60000 and 120000 counts. The obtained analysis results did not make any sense so I looked the data more in detail and noticed that the oplev did not seem to be affected by the ESD driving signal. To be sure that I was not making any mistake I used awggui to excite the ESD in pitch and yaw such that they would excite the respective pendulum modes (at 0.56 and 0.6 Hz) identified here: https://awiki.ligo-wa.caltech.edu/aLIGO/Resonances/LHO. Nothing was observed on 'oplev'. Tomorrow I will have to verify that the ESD is actually physically connected.

LVEA laser safe

09:00 – FSS out of lock. Lowered the FSS resonance threshold to 0.3 from 0.4. Peter King will look into PSL alignment.   
09:15 Nathan – Working in the optics lab
09:58 Greg – At BSC1 area working on laser barriers for CO2 laser alignment
10:01 Travis – Working on mobility experiment at HAM3
10:06 Betsy – General post chamber close cleanup in the LVEA
10:13 Gerardo – Working on viewport survey at BSC1/BSC2 area
10:55 Jim – Recycle mid-X weather station software
11:12 Peter – Going into H1-PSL enclosure to tweak ISS alignment/power loss
12:00 Power cycle restart of the camera monitor computer in the control room.  
12:42 Kiwamu & Dave – Kiwamu update and restart LSC model. Dave restart DAQ
13:00 Bubba – End-Y working on deionizer installation
13:27 Bubba – Drilling bolt holes in floor at End-Y
13:47 Gerardo – Viewport survey in LVEA
13:52 Allister – At TCS-X to examine optics
14:10 Karen – Reported the emergency lights are on in the End-Y VEA
14:37 Doug & Jason – Working at the ITM-X manifold 
14:52 Jeff & crew – At End-X 
14:55 Alarm on corner station chiller pump #3. Pump tripped off. Informed John W. 
15:25 Summer students – PEM work at End-X

Strange - another chilled water pump trip - this time in the corner. CWP3 VFD unit tripped. I reset the 480volt circuit (pushed the reset button, did NOT cycle the breaker).

The pump started up with no issues. Currently I have left the system with two CWPs and their associated chillers running. Both CWP1 and CWP3 are running. I happened to be in the control room when Jeff reported an alarm The LVEA is recovering from a ~0.5 F temperature excursion.

PSL Status: 
SysStat: Green 
Output power: 35.9w  
Frontend Watch: Good
HPO Watch: Red  

PMC:
Locked: 0 days, 0 hours, 28 minutes
Reflected power:    4.9w
Power Transmitted: 19.9w 
Total Power:       24.7w 

FSS:
Locked: 0 days, 0 hours, 28 minutes
Trans PD: 0.003v

ISS:
Diffracted power: 12.831%
Last saturation event: 28 minutes 

Rolf, Jim and Dave. We have created RCG tag 2.8.5 from branch 2.8. This version has the bug fix to disable the 18bit DAC Anti-aliasing chassis when the new timed DACKILL part is activated. 

2.8.5 also has two dataviewer changes, these have already been installed at LHO by Jim prior to this release.

I have set the rcgcore and lho/h1 release pointers to use 2.8.5. All model builds from now on will use this release.

JimW JeffK HughR

We looked at HEPI TFs from March and this morning and see almost no differences.  Comparing TFs beween EndY & EndX also sees almost no differences either.

However, see the attached comparing the Isolation filters at the endy (Blue) and endx (Red).  Mag & phase both are quite different at our 8hz problem area.

Cleaning crew reports the emergency lights are on in the LVA at End-Y. Have informed John W. Will check if there is an open circuit breaker left over from Fridays power glitch.  

Kiwamu and Dave. Installed new LSC model, then restarted the DAQ. We had an NFS caching issue, even giving a period of at least 15 seconds between the  make-install and the restart, the model had cached the old INI file and we did not get the expected DAQ status of 0x2000. After verifying that the INI had indeed changed, we restarted the model once more and the new INI file was picked up by the model. 

After BSC1 closeout on Friday, undamped transfer functions were ran over the week end on the beamsplitter for both top and middle stage. During the measurement the ISI was damped. Measurements are clean, as seen on the results attached. For some reason a factor of two-ish appeared in the M2 level tf (model=2ish*meas) in all dofs.

Attached results are presented as below :
 
1. H1 M1-M1 undamped tfs compared with the model
2. H1 M2-M2 undamped tfs compared with the model
3. H1 M1-M1 undamped tfs compared with previous H1 BS measurement (last month, after wire baffle install), and L1 in vacuum
4. H1 M2-M2 undamped tfs compared with previous H1 BS measurement (last september, under vacuum), and L1 in vacuum
 

All scripts and data have been commited to the svn

I left the ISI just damped with the HEPI loops closed.  SEI tripped at 2027pdt.  The ISI went on L4C levels 2 seconds before the HEPI tripped for Actuators...  Maybe this makes sense compared to the previous trips where the ISI trips earlier wrt the HEPI when at least one stage of the ISI is isolated--when the ISI is isolating, it rings up its actuators faster as it drives in response.  Again, clear 8ish hz ring up on all the HEPI/ISI signals.

Looking at the TF/Coh between HEPI out & ISI L4C as expected there is coherence; the magnitude of the TF is reduced with the X & Y HEPI ISO Boosts are disabled.  Wait that makes sense as the ISI isolation is quieting the L4C...

Tested enabling the boosts.  Independently enabling either X or Y boosts rings up and trips the ISI within a minute or so.  While there is no foton magnitude difference between ISOL filter with and without boost, there is a 20 degree phase difference.

Given that the trip happens with just ISI damping and the boost seems to hasten things when the ISI is Isolated, JeffK recommends check for plant changes at ETMY HEPI.

J. Kissel, A. Pele

Ran transfer functions over the weekend, to assess if the SUS is free after first contact removal and closing doors. While the top stages look great, this is the first time I've been exposed to a factor of two missing between model and measurement for the lower stages. While we don't expect the model to account for the dynamics of the reaction chain (which is why we see a whole bunch of "extra" features in the main-chain dynamics), we don't expect an overall gain mismatch. Arnaud informs me that this is true of every QUAD except one stage of one (including L1 SUS ITMY). 

No reason to pull doors off, but we should figure out where this discrepancy lies. And also , we should develop a model of the lower stage dynamics which include both chains.

J. Kissel, J. Batch,

Jim informed me this morning that other front-end models, seemingly unconnected to my h1isietmx model restart, had their framebuilder data corrupted immediately following my restart. Hence all frame data from these computers has been hosed since 2014-07-31 22:45 UTC. See Jim's complementary log here.

The corruption is a result of an mxstream glitch sent out by h1isietmx upon restart, that was sent across the ethernet connection to other computers on the same ethernet network (i.e. h1sush2b, h1oaf, h1pemmy, h1pemmx, h1susey and h1lsc). This is a known problem at least by Jim (who will subsequently write a bugzilla report).

To identify the problem:
- Open CDS_OVERVIEW screen
- Look for models / computers that have *both* the DAQ (Data AQuisition system) and the DDC (Daq Data Concentrator) showing red status in their CDS STATE WORD, (e.g H1:FEC-103_STATE_WORD).

To solve the problem:
- Log into corrupted front-end
- run /etc/start_streamers.sh
This reboots the mxstream process, occasionally glitches the framewriting PSL front end (?!), presumably fixes the problem, and restores the STATE WORD to green.

This plot is interesting.  It seems the only moderately pronounced peak in the horizontal ground spectrum wanders, seen from 8 to 11hz changing quite rapidly.

The attached plot's current traces are with HEPI loops closed and the ISI Damped.  While the middle graph shows all four local IPSs have the strong 8hz peak (the dashed REFs are with the HEPI loops open), the peak only shows in the X & Y and not the RZ cartesian traces (top graph).  Also, note the bottom graph where the ground sensor pretty much has nothing at 8hz but does have a minor peak just above 9hz that is also peaking up in the local sensors.

The second plot shows just the ground Seismometer with X & Y traces from last night (Dashed) and the others from this morning. The peaks in that area come and go and wander around so it may or may not be a problem or just a red herring (are those edible?)