This morning I spent sometime updating the ops overview screen, it is projected in the control room again.

There are two things that would be helpfull from operators on shift or anyone on site:

•   Checking that the intent bit is accurate  This bit should be set to undisturbed when no one is actively working on the interferometer, and set to commisioning if there are measurements running or people working in the LVEA. This will let detchar know when to look at the data.  Commisioners will try to remember to set this as well when we leave for the night and when we start work, but it would be helpfull if everyone keeps an eye out to make sure it is accurate, especially when work first starts in the morning.
• Untripping watchdogs if there is no known reason why something should be tripped, we should try to keep things isolated/damping and keep the PSL running. 

While I was doing this I noticed that the PSL ODC state bit was bad.  I toggled the noise eater switch to get rid of the NPRO relaxation oscillation, after which stefan readjusted the ISS setpoint.  The theory is that the setpoint was adjusted while the NPRO was oscillating, once the oscillation was gone the ISS could no longer lock at that set point. 

Lastly, the FSS mixer voltage has been around 0.8 since june 16, when the PSL came back from the maintence.  Peter King tells me the PD was swapped out durring that time, so I have raised the threshold for the ODC to 0.9V from 0.6V.  The PSL ODC bit is now green. 

Jeff K., Krishna V., Erik S.

We managed to reduce the frequency to about 6 mHz. We then attached the left arm of the vacuum can. The heat-shield cross-links were then connected, the reference beam-splitter was installed and we did a rough alignment of the optics. The top flange was then put in place and we bolted the autocollimator on and turned on the LED. With some foil-shims under the autocollimator, the alignment was good enough to get clean images of both the reference beam-splitter and the balance-mirror. After a few attempts of moving the adjustment rod very carefully, we managed to get the balance-mirror in range of the autocollimator.

We then enclosed the tiltmeter in the foam-box and started the data-taking program on the laptop. The next step will be to measure the tilt transfer function to measure the distance between the center of mass (COM) and the pivot. We will then adjust masses on the balance to minimize this distance.

We're already measuring sub-nanoradian precision.... at 10 [Hz] ;-). See attached read-out display. On the upper right display is the difference between the reference mirror and balance mirror position as measured by the autocollimator (left and right image pattern on the upper left panel, respectively), where 1 [pixel bit] = 3.5 [urad]. You can see the spot images that the CCD is sampling on the first images of the "Day3b.pdf". The ASD in the bottom left corner shows the measured tilt as a function frequency. 

Source mdl and C files used to build the H1 front end models:

Files which are locally modified (need to be checked into the repository):

Jeff B, Arnaud, Kiwamu and Dave

I'm instigating a weekly resolution of partially loaded or modified filter files. The philosophy is that pending filter changes shoud be applied regularly, preferably during Tuesday maintenance. Unloaded FM changes are time bombs which can impact on recovery time following a model restart, computer reboot or power glitch.

Running the command "check_filtermodule_load_status" this afternoon gave the output:

Similar to HAM2 & HAM3 but the shift in position wasn't enough to trip the ISI but the outputs were decidedly large.  So, I reset the target position to the free hang position.  Unable to safe.snap as SUS folk are using platform. 

Day Shift Summary
LVEA laser hazard

09:02 Justin – Transition LVEA to laser safe
09:15 Doug & Jason – OpLev alignment at X-Arm
09:22 Nathan – Working in the optics lab
09:25 Paul, Jordan, & Sudairsham – At Y-1 in beam tube taking PEM measurements
09:30 John & Gerardo – Vacuum pumping in corner station
09:37 Hugh – Unlocking HEPI at HAM2 & HAM3
09:45 Richard – High Voltage on at End-Y
10:21 Betsy – Cleanup work in west bay
11:15 Richard – Going to End-Y
12:24 Hugh – HAM3 HEPI work
12:44 Gerardo – Going to End-Y
13:00 Karen – Cleaning at End-Y
13:38 Kiwamu – Escorting a group from KAGRA on a tour of the PSL
14:20 Apollo – Installing feed through at HAM6
15:02 Jeff – Going to End-X to work on tilt meter
15:21 Doug, Jason, & Apollo – OpLev preparation work at Y-Arm
15:26 Vern – OpLev preparation work at Y-Arm  
16:00 Greg & Allister – Energizing CO2 laser in east squeezer bay
16:05 Shelia – Transition LVEA to laser hazard    

Appolo Team installed the feedthrough on HAM6 for the ISC fast shutter and the feedthrough emulator.
The fast shutter was tested with a DC power supply and it was confirmed the shutter mirror popped up.

Since the prepared feedthrough has the form factor of 2.75" CF, a zero-length adapter 2.75"-4.5" was inserted (great thanks to Gerado and John).

Once the feedthrough was installed, the in-vac shutter cable was connected to the feedthrough.
Then the shutter connection was tested by giving some current. With a current of 50mA, I could confirm that the shutter mirror popped up with this current.
At CIT we tested the shutter at 150mA in a vacuum pressure and it survived. So as long as we don't exceed this current, the shutter coil is completely safe.

The viewport emulator was also installed on the North door flange.
The heights of the emulation rings, particularly the east-most one which was moving, should be confirmed and adjusted.

With the new cart biases, this is certainly a time to update the safe file.  I've also taken on the campaign of turning off outputs of unused filter banks feeding into the active loop paths.  Since these can get an offset etc and one might be none the wiser.  If the nominal state for the unused banks is output off, seeing that the output wires not green is sufficient to know that those other banks are not causing a problem.

I instructed conlog to stop recording 98 *_THRESH_MAX channels. These can count down every second over a long period of time.

The names were added to the exclude list in '/ligo/lho/data/conlog/h1/input_pv_list/exclude.txt' and the script to generate a new channel list was run. The script removed these and added 13 TCS channels and 1 SYS channel.

In total 14 channels added, 98 channels removed.

Very similar story to previous post on WHAM3.  As soon as the target position was reset to the current free position the controller locked right in.  I don't see as large a shift at balance time but may be clouded by whether the ISI is locked or not.   Attached are the local CPS, Cartesian CPS, and changes in the Target positions.

The ISI was tripping and I saw it was because the deltas between free position and the targets were too large.  I didn't realize we were restoring all DOFs, I thought we only restored the RZ (Yaw) except for a few other special case locations.  This tripping was happening during the RX & RY target restores and maybe this makes sense.  The payload/balance changed on HAM3 (as on many others) and the balance was done well within spec.  See the first attachment for the CPS Local shifts during my balance on July24. This looks pretty bad even though our spec is +-1600 counts.  This is a 2 day plot though and there may be some detail in the time I actually balanced, like, since the payload changed here so might some distortion on the table and a new CPS zero/lock comes about.  Regardless, it is still within spec even though I feel this could have been balanced better.  See the second plot though for the real problem.  Since the free hanging position moved, of course so did the cartesian position.  Since the current ISI control scheme is restoring the target bias of all DoFs, the controller has a lot further to drive to the target and hence the trip.  Tried several times with Guardian and ISI scripts and same thing.  I reset the Targets to the current free hanging position and all is well. The third plot is the shift in the target position for the record if someone needs to steer back.

WHAM3 is currently under managed Guardian control at ISOLATED.

I slightly modified the previously made LSC ODC block and added it to Kiwamu's latest LSC model. The model compiles, but I am holding off with installing on running. They are not in svn yet because I want to verify the model is running well.

Affected files:

common/models/lsc_asKiwamuLeftIt_20140806.mdl               : What the name sais. My starting point.
common/models/lsc_addingODC_inprogress_20140805.mdl  : my changes
common/models/lsc.mdl                                                           : currently same as common/models/lsc_addingODC_inprogress_20140805.mdl
h1/models/h1lsc_asKiwamuLeftIt_20140806.mdl                    : What the name sais. My starting point.
h1/models/h1lsc_ODCAdded_20140806.mdl                          : my changes
h1/models/h1lsc.mdl                                                                : currently same as h1/models/h1lsc_ODCAdded_20140806.mdl

Unable to run some static tests on this HEPI due to large offset on the IPS.  Tweeked this to ~100.  See the attached: The 7th graph is the local IPS V4 sensor and the zeroing is clear.  The rest of the graphs are the cartesian values.  It makes sense that Z RX & RY are changed during the tweek.  The rest of the CART DoFs are unchanged.  Don't be fooled--the shifts in the other dofs are earlier by a few minutes when the loops were opened.

I will be at LHO next week to conduct measurements relevant to BSC pier amplification. The linked document contains the plans and some questions about what can be done on site.

https://dcc.ligo.org/LIGO-L1400130

Had to power up the ESD HV supplies this morning for testing the charge on the optic.  Once again one of the supplies would not stay on.  As it ran through diagnostics during start up it would trip off.  We replaced this unit.  The next problem was the DAC cable was on the wrong connection on the AI board.  This probably happened during Power board check a few weeks ago.  After this was fixed had to unplug and plug back in DAC cable at ESD to clear error there.  This has been seen in the past and resembles a blown chassis by railing outputs at 430Vdc.  The system was then restarted and appears to be working

model restarts logged for Tue 05/Aug/2014
2014_08_05 10:16 h1hpietmy
2014_08_05 10:16 h1iopseiey
2014_08_05 10:16 h1isietmy
2014_08_05 10:20 h1iopsusey
2014_08_05 10:20 h1susetmy
2014_08_05 10:20 h1sustmsy
2014_08_05 13:02 h1fw1

Unexpected freeze of h1seiey, unexpected dolphin glitch of h1susey during recovery, unexpected h1fw1 restart.

Corner Station:
	Pumping continues throughout the day
HAM6: 
	Table is ready for beam
	Replacing feed through for fast shutter
	Mounting Viewport emulator on north side of chamber
OpLev:
	Alignment on X-Arm and Y-Arm
EE:
	Installing whitening chassis for OpLevs
End-Y:
	Working on charging experiment
End-X: 
	Installation of Tip-Tilt equipment  

While doing cabling for HAM6 in the CER, noticed that the following cables for ISCT1 in ISC-C2 were plugged in backwards. Swapped the following at the EtherCAT Corner 5 Chassis. Cables are connected as listed below and match the pull list E12000408.

Cable_ISC_328 connected to Port 9 (DC PD's ISCT1)
Cable_ISC_326 connected to Port 10 (Auxiliary ISCT1)

Filiberto Clara

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?)

This morning after Jim locked the BSC1 ISI, I applied First Contact to the ITMy CP-AR surface via the spray cone technique.  We then made final preps to the SUS locking down nuts, closing the ring heater, etc.

Particle counts in chamber before we started, but after Mitch had walked through for access to the X-spool ~an hour earlier:

0.3um  30

0.5um  10

1.0um  10

Particle counts after FC spraying was done, taken nearish door ~10 mins after spraying complete, 3 people working in chamber:

0.3um  840

0.5um  430

1.0um  260

Greg also looked at the TCS mirrors in BSC2 while we were there - more from him later I suspect.

We wiped our way out of BSC2 and BSC1.

I then went into BSC3 and wiped the floor.

We broke for lunch. 

After lunch we used the N2 gun and removed the FC from the CPx-AR and ITMx-HR.  We then alternated blowing on the ITMx-HR and gap between optics for 1 min intervals until each set of surfaces had seen ~5min of N2 deionization at 10psi.  I blew the barrels a little while as well.

After unclamping the TM and CP, we set the 1" witness optic and the 3" witness plate on the QUAD SUS and 1 3" WP horizontally on the floor in the center of the chamber.  A quick check of TFs in V, P, and T showed a healthy suspension, so we closed the BSC3 door.

Moving down to BSC2, we pulled the FC on the BS-AR.  It tore across the top and then as we pulled it down across the optic it left 2 ~2mm chunks of FC in the center ~4 inches of the optic.  We determined that we would need to respray clean this surface (phiszzll) so we aborted the BSC2 and BSC1 chamber closeout.

We pulled the BS-HR FC to make sure it wouldn't leave anything else either.

Jim locked the BSC2 ISI again and we mounted the FC spray cone to respray FC on the BS-AR and HR surfaces.  We reinforced the edges of the sheets with paint-on FC as usual.  Tomorrow we will reattempt to pull the BS and ITMx FC sheets and move on to close these chambers.