I discovered why the reboot of h1seih45 yesterday did not get logged the same way in which a model restart does. When the OS is rebooted, the startup procedure for the front end models is slightly different and does not created the target/<name>/logs/reboot.log file. On h1boot I modified the /diskless/root/etc/rc.local file to call a new script /diskless/root/etc/log_fe_startup.sh which creates the reboot.log file for each model running on the computer (including the iop model).

While Greg & Jim replaced the Parker Valve here just last week, the replacement had a performance of 133% of nominal.. L124 needs calibration.  We'll leave this in bleed mode for at least a couple hours.

While a contractor was on site commissioning our New GC UPS  I asked him to look at our CDS UPS as we have been having communication problems with it.  He quickly identified the problem we put the unit into bypass and swapped a lead/lag module around and restored the system.  We are on the alternate module and a replacement will be ordered.  

A Backhoe working in the 400 area for DOE struck our fiber connection to the Hanford fiber loop.   Lockheed Martin is in the process evaluating the damage and will let us know how bad it is.  Best case it is after our feed and on the Hanford loop so we could reroute.  Worst case it is our fiber run and will have to be repaired.

Jeff B

@ 10:00 BSC2 HEPI & ISI Tripped. Reset watchdogs and both have recovered. 

Jeff B

@ 10:02 the BCS1 SUS, HEPI, and ISI Watchdogs tripped. Reser watchdogs and all systems have recovered.

I closed these late yesterday but then turned them off again over night.  I've collected overnight spectra now and have re-closed the loops.  I'll make comparisons with the HEPI L4Cs and the ISI T240s for evidence of minimal harm from the loops.  Attached is the comparison--I'll examine it closer too but I think there are elevated areas with the loops on between 0.7 and 10hz.  Maybe we can live with this or tune this out.

Adjusted fan 1 output to 12000 SCFM, this also corresponds to the fan output at X end.  This request was to see if we could reduce a noise peak that showed up in Jim Warner's test spectra.

model restarts logged for Mon 07/Apr/2014

none reported by the software, but...

looks like I've got a bug in the reporting software, we rebooted the h1seih45 computer and the models started up automatically. Somehow this method of startup was not logged, here are the restarts entered manually:

Mon Apr  7 11:51:26 2014

h1iopseih45

h1hpiham4

h1hpiham5

h1isiham4

h1isiham5

Here is the list of commissioning task for the next 7-14 days:

Green team:

• Look for the source of the 1/f noise.
• Look for clipping in green transmission.
• Make a mode scan of the red higher order modes.
• Test the length feedback path to the ETM top suspension point to suppress microseism.

Red team:

• Center the red QPDs in EX.

Blue team (ALS WFS):

• High bandwidth WFS.

Blue team (ISCTEY):

• Reflected beam quality investigation.
• Add WFS cabling.
• Add baffle diode electronics

SEI/SUS team:

• ETMY SEI commissioning.
• ETMY SUS commissioning.

Since Saturday the ODC for the PSL and (obviously) IMC have looked a little odd. They both keeping reporting very short, quick times when both the systems are not 'good'. These happen throughout the day as you can see by the two attached plots which show yesterday's activities (you can see more of these plots on the summary pages - https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/). Just wanted to check you knew about this and if so is this nothing to worry about? Thanks! 

Sheila, Chris, Alexa, Stefan

This morning we looked for coherences with many signals with our COMM noise.  There weren't any surprises, we see the same coherence with the end station PDH control signal around 1kHz that we are used to, ISCT1 accelerometers around 70-100Hz, and a little coherence (-0.7-0.9) with the oplevs at low frequencies (pitch at 0.5Hz, yaw around 0.1).  We don't see much coherence at all with the TMS QPDs, just a small bit at low frequencies.  We lose coherence with the in loop sensor below around 100Hz.  

Chris and I went out to End X to look into the beam quality problems.  We didn't find much that was promising.  We checked rather carefully for clipping on the way into the chamber again.  We also set up the nanoscan again, and we see that there really isn't anything coming back to the WFS when the ITM and the ETM are both misaligned (so it isn't a second beam that is directly reflecting a lens or some optic on transmon.)  

We also tried Daniel's suggestion of closing down an iris in the path.  For WFS B this only made things worse.  WFS A scans will be attached to this alog soon, but we didn't get any improvement there either.  

We came back and tried out some of Rich's blends.  We were able to get relatively low noise once without using WFS, 30z down to 0.02 Hz. The attached plot shows the COMM noise (measured by the IR) with different blends on.  We are curently seeing a lot of noise on ETMX T240s at around 3Hz, (100 times more) Rich is looking into this.

Optic is Newport 20B20NC.1 which has a 30min wedge. Since this is in a double path configuration it was not clear which orientation is the best, but I put it in such a way that the beam and the ghost beam going to the chamber separate immediately. OTOH this means that, for the return beam in HWS, PDH and WFS path, the main beam and the ghost crosses at a point 7" after the BS, and then separate. This is because it's easier to block the ghost beam(s) in HWS, PDH and WFS paths than at the back of the periscope.

After the installation of the BS, I used two irises downstream of the 2" PZT mirror to move the 2" PZT mirror position as well as the angle to recover the in-vac QPDs. I further adjusted the 2" PZT mirror and the corner steering mirror between the 1" lens and the 1" PZT mirror to center the beam horizontally on the 2" lens without losing the beam on QPDs.

The optic and the mirror holder were supplied by AOS, had to use lab stock for the post and the base plate.

This is Sheila, logged in as stefan
Switching blends to test some of Rich's new filter's etmx tripped.  Apparently according to rich this is a know problem, that the filters are incorrectly switched on a zero crossing instead of ramped.  

Guardian has recovered without a hitch.  

Hard closed GV11 (Bad, abnormal, "clank" from cam mechanism a few seconds before motor stopped) -> portable RGA assembly is valved into Y2 beam tube -> avoid this apparatus (at Y-mid on elevated slab near GV12) 

Took over for Justin/Pablo at about 2pm to cover the remainder of the shift.  The only new activities I can add are the following:

• 2:40--Installing jumper for T240 at EX (Aaron for Rich Mittlemen)
• After 4pm--Kyle will be closing GV11 for vacuum data on Y2 (see WP 4549)

PT410B seems to have responded, i.e. there looks to be some pressure "communication" via an inner O-ring (perhaps)

Scotty, Mitchell,
The Stage 2 midplate was torqued, inner hex walls added and torqued. The stage 1 Close out plate was added and torqued, the stage 1 close out plate cover was added. No hardware has been added, as there are 405 shcs's and the temp in the cleanroom was 85 which became a good stopping point.

will run for ~ 16 hours (undamped / damped for main and reaction chain)