Peek Down X-arm TOMORROW!  Here are notes regarding it:

• COMMISSIONING TEAM:  Stated they are ready (ASC Model update & x-ALS prep COMPLETE).
• VACUUM:  Prepping today & ready for peek at 8am tomorrow.
• Pseudo Maintenance Day tomorrow:  Usual vendors OK, NO ENTRY in HAM6, NO viewport work, NO Craning

Other Items:

• Ailing PSL being downgraded to only frontend 35-W operation to hobble along until PSL upgrade starting 2/12.
• TCS laser commissioning (T-Vo):   PZT & chiller work being done & using guardian as well.
• ETMy is in chamber and this week should consist of alignment work (Kissel)
• HEPI status (Hugh):  EY waiting for door to go on, then can run fluid through system.  
• PCAL Baffles (TJ):  getting parts processed this week
• Squeezer (Terry):  Escape efficiency measurement, install new mirror from MIT, ISCT6 work continuing and cabling continuing

   Checked PSL filters. No debris noted in either filter. The crystal chiller filter is starting to yellow. The diode chiller filter has darkening somewhat, but not as much as the crystal chiller. I plan to swap both sets of filters (2 filters in the chiller room and 2 in the PSL enclosure) when the PSL goes down for the 70 watt amp change. I have all 4 filters on hand. 

   Peter King - added 300ml water to crystal chiller this morning. 

   Closing FAMIS task #8305   

The ongoing "trippy" saga of "As the Diodes Weaken" is reflected in all aspects of the trends as LASER outages and incursions have been more frequent. Peter and Jeff are currently in the enclosure and the Pre-Mode cleaner appears to be off its alignment.

TITLE: 02/05 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 9mph Gusts, 8mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.16 μm/s
QUICK SUMMARY:

• No H1 PSL light.  Peter (& I believe Bartlett) are working on the PSL.
• Receiving "leap second Runtime Warning" (noted by Jenne on Jan 10th) when running Dust Monitor check script.
• Cleaning crew at EY.

The LVEA has transitioned to LASER SAFE.

I misplaced a small adapter needed to connect the leak detector but will pump down and leak check this new setup early next week.

A couple of status screens at the time of shutdown.  Both the diode and crystal chillers are off.  Internal and external shutters
are closed.  The PSL Beckhoff computer will remain on.  The diode currents for all heads have been set to zero.

head 1 diode current: 65.0A
head 2 diode current: 59.8A
head 3 diode current: 59.8A
head 4 diode current: 59.8A

    Autolockers for the pre-modecleaner, intensity stabilisation and frequency stabilisation are off.  I took the input modecleaner
off line.


"It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known."
Sydney Carton

Jenne, TVo

We set out today trying to lock MICH with the newly aligned AS_A and AS_B senors from aLOG-40338, however, we had problems trying to get the light back on the diodes which is confusing because there weren't large alignment changes between now and this past Tuesday.  

In the end of a lot of alignment tweaks, we were able flash MICH fringes and get light onto the AS_A, AS_B, and AS_C individually, but not at the same time as we would expect.  Attached is the screenshot of our current alignment.

Krishna

The new BRS DetChar Summary pages alerted me to a strange noise visible on Jan 19th and Jan 20th.

I looked at the rY_in DQ channel and the noise looks like short duration spikes in the angle channel. See first attached plot. The low-frequency oscillation of BRS-X is visible and the spikes start in the 17th minute of the plot. Zooming in (next plot), these spikes last for 8-10 second and the data resumes it's previous trend, with no apparent offset. I looked at most of the error bits listed in the BRS troubleshooting guide and saw no indication of any kind of hardware issue. I have also attached the DRIFTMON data showing a similar spike but appropriately smaller, indicating that it is a real deviation as seen by the C# code. I looked through two months of recent data and don't see any other similar noise.

I have two theories to explain this:

1. We have a literal bug in the autocollimator - most likely near the CCD. The CCD isn't fully enclosed and there is room for bugs/critters to get in there especially since they are attracted by the heat of the CCD. We had a similar issue some time ago in the lab. Whether or not this is what happened, Michael and I agree we should try to more fully seal the autocollimator so that this never happens.

2. The CCD is failing. I think this is less likely since it seems to be functioning perfectly now, even though the code hasn't been restarted since Jan 4. The previous time the CCD malfunctioned (Jan 31), the symptoms were very different (see 4th plot). However, we can't rule this out completely. We need to see if this happens again (after sealing up the CCD), and if needed the CCD can be replaced. It is an off-the-shelf item - Basler Racer raL4096-24gm.

Due to the large size of the isc userapps repository (4.1GB), while I was checking out the ISC from scratch some ALS MEDM macro-substitutions did not work. For other large systems I will do the checkout into a temp directory and then do the 1.6 to 1.8 upgrade in one atomic operation.

This also caused bogus filter-file-changed warning with no actual content changed.

We shifted the ALS laser in the X end stations by ~18.6GHz (-6.2V on the crystal temperature control voltage) to bring it close to the PSL. This offset was then relieved using the front panel potentiometer. The ALS autolocker is working again.

The same shift will have to be applied to the Y end laser.

Some other strangeness:

• The VCO RF output monitor (H1:ALS-X_VCO_OUTPUTMON) reads -4.8dBm when it should read +19dBm. We verified that the VCO still outputs 19dBm, so this seems a problem of the RF power readback.
• One LO readback channel of the WFS reads -11 instead of ~18dBm (H1:ALS-X_WFS_A_DEMOD_LOMONCHANNEL_4).

16:30 JeffB to LVEA

16:30 Bubba to EX, back 17:45

16:50 Hugh to HAM6

17:35 Nico to LVEA, back 18:10

17:45 JeffB to LVEA

18:15 TJ to optics lab

18:15 Jason to EY

18:25 Kyle to MY

18:30 - 18:56 UTC Corey and Richard to end X, looking at solar panels, batteries for
vacuum gauge
18:37 - 19:32 UTC Karen and Vanessa cleaning at mid Y
19:00 - 19:16 UTC Bubba taking measurements in LVEA
19:00 - ~20:00 UTC Marc WP 7327
19:00 - 19:23 UTC Filiberto WP 7309
19:07 - 19:34 UTC Amber and two visitors from OSA in LVEA
19:23 - 19:58 UTC Jeff B. to LVEA, ITM camera work
19:37 UTC Sheila back from optics lab (in about an hour ago)
19:44 UTC Chris opening OSB outer rollup door
19:45 UTC Dave restarting models, IMC down
19:48 UTC Jason back from end Y

21:15 TJ Nico to LVEA

21:15 TVo checking to see if light pipe was closed

21:15 Keita, Georgia, DaveO, Daniel to LVEA then EX

22:45 Sheila to optics lab

Thomas informed me that the PSL ISS was having issues.  Upon investigation I found the HPO was only outputting ~117W.  To keep the laser running for the remainder of the day, I tweaked the pump diode operating temperatures for DB1 and increased the operating current of DB2, 3, and 4 from 59.0A to 59.7A.  The output power of the HPO increased to 131.0W; this also cleaned up the ISS, which was oscillating because of the low power out of the HPO.

During the upgrade process, some local working directories on the CDS file system will still be using the old 1.6 svn version, and others will be using the upgraded 1.8 version.  Remember that the two versions are completely incompatible (in both directions).

The CDS workstations now have version 1.8 svn code installed in the default svn location (/usr/bin/svn). To permit running the 1.6 code if and when needed, please create an alias in your .bashrc file

alias svn1.6="/ligo/apps/debian8/subversion-1.6-17/bin/svn"

This is only a temporary work around, eventually all working directories will be migrated to 1.8.

IMPORTANT NOTE: when viewing a 1.6 working directory with a 1.8 svn program, the system may suggest you upgrade the directory using the 'svn upgrade' command.

Please do not do this!

In the upgrade process I am resolving local modification, adding files which should be under config control, and making sure files which are cluttering up the old working directories do not migrate to the new directories.

Elizabeth C., Marc P.

Taking advantage of a one hour window in operation we repaired the Corner 4 and Corner 6 squeezer readbacks per WP7309. 

In Corner 4 we replaced module 19 on the left rail with a new EL3104 (4 channel differential ADC)

In Corner 6 we replaced module 5 on the right rail with a new EL1124 (4 channel digital input)

Both of the replaced modules appear to be working.

Sheila, Nutsinee

Here I attached the SHG conversion efficiency measurement as a function of 1064 input power (red dots) plotted against theoretical prediction (the equation came from Polzik and Kimble 1991 paper on frequency doubling) . ~75% conversion efficiency at 400mW input, 48% conversion efficiency at 100mW input. For the fit I tweaked a couple parameters, intracavity losses (L) and the single-pass nonlinear conversion efficiency (Enl).

Here's everything I wrote down.

The common mode board common path gain was adjusted to keep the UGF at 3kHz.

The responsivity was adjusted to match the photodiode readback to the power meter.

P in and P out was measured with a 1W Thorlabs power meter. P trans was read out of the photodiode.

The optimized crystal temperature for green output was the same for all input power, at 35.9 C