Help me, Jamie! I want to use LSC_PRMIsb!

HAM3 ISI was found to be down. So I brought it up with the level 3 isolation as noted by Hugo (alog 10114). According to its watchdog medm screen, it tripped because the payload had tripped at 1076806396 (which corresponds to Feb 19 2014 00:53:00 UTC).

Until the blue team starts working on the WFS.

Also, I disabled the oplev damping loop to avoid unnecessary kick because the oplev beam is almost off from its QPD. I did the following commands:

ezcaswitch  H1:SUS-ETMX_L2_OLDAMP_Y OUTPUT OFF

ezcaswitch  H1:SUS-ETMX_L2_OLDAMP_P OUTPUT OFF

I found that the LSC feedback was left on for the PRLC servo. This kept kicking PRM and PR2 without locking anything. Bad. I disabled it for now.

for some reason the ITMX ISI was using 750 blends, although Hugho left it on Tcrappy friday night (10114) and Hugh checked that things were OK this morning (10122.)

I moved it to Tcrappy on both stages

The IR path on ISCEX must have gotten misalinged, I tuned up the beat note and now we have -13.5dBm reported by the PFD. 

Running from opsws0. Should finish by the morning meeting. It's very windy right now, so we may not get anything useful out.

- Ref Cav not locking in the morning around 8:30 AM. Sheila D was notified and now locking stably 

- Transition LVEA to laser hazard at 8:45 AM PT

- Richard M looking at ELIGO TCS viewports on the X Arm spool.

- Jeff B and Andres R working on SR3

- Dave and Jim doing a DAQ restart at 11:01 AM PT

- Arnaud at HAM4 working on SR2 at 1:28 PM PT

- Bottled water refill on site at 9:30 AM PT

I misaligned the BS and ITMX and looked at the trended time series of REFLAIR_A_RF45_Q_ERR. Since the beam is (in theory) bouncing prompty off the PRM and onto the diode without any kind of Fabry-Perot interference, this signal should tell us something about 45 MHz RFAM.

The calibration (7.6 cts / nm) is from elog 10127.

We used AM laser to check up the ALSX WFS.

AM laser output: 1.8mW (measured with old ophir power meter, 978nm, filterr out)

Modulation source was set to 0.1vpp 24.389310MHz (this frequency was set before fixing the 1.002MHz that was mentioned in another alog).

WFS DC interface was set to low DC gain mode and the DC offset zero-ed.

Demod whitening gain was 21dB, first and the second whitening filter were on and the third off, a-whites were turned on though I don't know if they're put in yet (turns out that the awhites were not yet there when we did this measurement, so the "demod" numbers in the table below are 33dB higher than they should be.).

Seems like the demod signal out of WFSA SEG3 and WFSB SEG2 are both about a factor of 2 smaller than the others. On the scope it seemed that the RF signal coming from the WFS head was already small for these segments.

We confirmed that the whitening gain and filters are working.

We have found that the polarization of PDH/WFS path was totally bogus because of one HWP somebody has installed, and that was the reason why the green 50:50 S-pol splitter was giving us something like 20:80. We rotated the HWP such that 50:50 becomes 50:50-ish, but that also means that 80:20 splitter to separate PDH and WFS was also affected.

Before: 4.4mW or so going into PDH, 4.8mW into WFS (0.9mW WFSA and the rest WFSB).

After: 8.2mW for PDH, 1.2mW for WFS (0.6mW WFSA, 0.6mW WFSB).

Tomorrow we'll remove the HWP as it is not in the design.

During green WFS RF check we've found that the PDH modulation frequency was set to 23.387319MHz , which is 1.002MHz off of our previously set frequency 24.389319 MHz (see alog 9708 when it was set last time). Strange.

Added APPSROOT environment variable to the default user environment with a value of either /ligo/apps/linux-x86_64 or /ligo/apps/darwin-x86_64 as appropriate.  Also fixed MANPATH environment variable value so it also points to system man pages.

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

Green team:

• Hand-off to red
• Noise measurement between red and green locked on red.
• Make a mode scan of the red resonances.
• ETM drive diagonalization for length and angle.
• ITM drive diagonalization for angle.
• Commission the length feedback path to the ETM top suspension point to suppress microseism.
• Camera for ITMX face view (possible?)

Red team:

• Center the red QPDs in EX.
• Investigate the robustness of the 3f lock in presence of an arm cavity.
• Start commissioning the alignment system. REFL_A commissioning.
• Optimize the thermal compensation of ITMY.
• Investigate the REFLAIR45 whitening filter issue.

Blue team (ALS WFS):

• Test electrical connections.
• Use AM laser to test RF signal chain.
• Beam quality investigation.
• Measure sensing matrix.

Blue team (ISCTEY, delayed):

• Prepare second set of WFS Complete the feedthrough panels.
• Install the on table cabling.
• Prepare for move to the end station.
• Check out ALS electronics in EY.
• Add WFS.

TMS:

• Ground loop investigation.
• Beam alignment in final position.

SEI/SUS team:

• Improve stability under high performance for ETMX.

This morning, with a little help from Hugh, I finished preparing the ISI for chamberside check out. I replaced the bad St1H3 cps, fixed some cable routing issues, then floated and balanced the stages. All went relatively painless, aside from the chaotic, cramped quarters in the end station (cables EVERYWHERE!). Now, all the sensors seem functional and I've started running some basic tests. Should be starting on tf's soon.

Working on unlocking SR2 suspension.