TITLE: 10/29 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Observing at 58.0319Mpc
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    Wind: 11mph Gusts, 7mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.46 μm/s
QUICK SUMMARY:

Currently have a lock approaching 2Hrs (started at around 73Mpc, but was slowly trending down, and in the last few minutes took a step down to 55Mpc) . 

Robert is here and has headed out to the end stations for injection work (the BRS was switched to the VERY_WINDY_NOBRSXY state).   Switching Observatory Mode to:  UNKNOWN (since I don't see an "injection" option).

Cheryl gave me a suggestion of keeping TCSx at 0.4 & moving TCSy from 0.0 to 0.2 for the next change.

State of H1: Locked in NLN, TCSX at 0.4W, TCSY at 0W

Incoming Operator: Corey

On Site: Robert

Possible issues that might effect locking / locking stability:

BS optical lever is glitching in sum and yaw, and glitching enough that this might have killed a lock already.

Might have broken the lock 2.5 hours ago, and could be a problem today.

State of H1: locked in NLN

Activities / Changes

• TCS: TCSX raised from 0.2W to 0.4W, TCSY remains at 0W
• Roll mode damping reverted, good in lock, bad on relock
• with reverted roll mode settings, changed ITMX phase -90deg, worked well

It looks like about 20 minutes after the increase in TCSY from 0 to 0.4W the range started to drop and continued until lock loss. Plot attached.

Set to 2 seconds and saved in SDF.

11:23UTC, changed TCSY from 0W to 0.4W, TCSX was at 0.2W and remains at 0.2W, next change in about 90 minutes.

State of H1: Nominal Low Noise

Activities that will contnue:

• changing TCS
• testing roll mode damping change that was good for ITMX, may or may not be good for the rest of the optics
• possibly work on violin modes and 2nd harmonic

I did a few more things tonight

• Turned off LP80 in SRCL, this reduces the gain peaking in that loop from almost 5dB to 2dB.  The second attached screen shot shows the control signal, the orginal configuration (with LP80) is the blue reference, the green reference is with the LP120 that I added to SRCL2, and the red trace is with only the 200Hz cheby low pass on.  Since SRCL noise doesn't bother us at 100Hz, it seems OK to add some noise there to reduce the control signal at 40 Hz.  (I've removed LP80 from the guardian)
• I also did a little bit of SRCL FF tuning, I used the old FF filter which is not as good as Jenne's JFF from september, but lets us split the FF into high and low frequency parts to adjust the gains seprately.  The third attachement shows the marginal improvement this made, but Jenne's new and improved filter will probably be better. After this I ran A2L, there was a bit of coherence (0.2 ish) from 20-30 Hz with CHARD Y, so we can probably puch the gain in that loop down and make the low passing more aggresive. 
• The remaining noise in DARM from 40-20 Hz was not very stationary after these small changes, but slightly better than where it was at the start of the lock. 
• Next I tried a little bit of driving the compensation plate while watching the camera.  I ended up drive 600 counts into RO DAMP L at 0.1 Hz for ITMX, the second to last attachment shows the 4 fringe wrapping shelves that show up with our nominal alingment of no offsets.  I could change offsets and make some shelves larger while other shelves got smaller.  A compromise position was -93 urad P, no Y offset, which is shown in the red trace. I wasn't able to see anything convincing in the SRM/SR3 camera.
• After Cheryl relocked the IFO (I caused the lockloss), I did a similar excitation on ITMY CP, and different noise in DARM.  For CPY only 100 counts excitation was needed to see noise in DARM up to 100Hz.  Cheryl and I watched the cameras, and might have seen something that was related to moving the CP.  We were able to steer the CP to reduce the noise in DARM while we were driving it, but it seems to make no difference to DARM when we aren't driving.

Now that we have the DBB plugged in again, we can relook at the coherences of the QPDs.  The screenshot shows coherences for DARM and SRCL with for the 200W beam (opening the 35W shutter unlocks the IFO).

We have small coherences with DARM just below 1kHz and around 4.2kHz, but not otherwise.  SRCL does have more coherence with one of the QPDs below 100Hz.

I think that the nominal setting of the CAL-PINJX_TRANSIENT filter bank gain is supposed to be zero. When a transient injection is imminent, then the gain is ramped to 1.0, the injection happens, and then the gain is ramped to zero. However, the SDF safe set point is 1.0. Therefore, I am setting the gain to 0 and accepting the change in the SDF safe file.

The results of cdsutils.avg() in guardian is sometimes giving us very weird values. 

We use this function to measure the offset value of the trans QPDs in Prep_TR_CARM.  At one point, the result of the average gave the same (wrong) value for both the X and Y QPDs, to within 9 decimal places (right side of screenshot, about halfway down).  Obviously this isn't right, but the fact that the values are identical will hopefully help track down what happened.

The next lock, it correctly got a value for the TransX (left side of screenshot, about halfway down), but didn't write a value for the TransY QPD, which indicates that it was trying to write the exact same value that was already there (epics writes aren't logged if they don't change the value). 

So, why did 3 different cdsutils averages all return a value of 751.242126465?

This isn't the first time that this has happened.  Stefan recalls at least one time from over the weekend, and I know Cheryl and I found this sometime last week. 

Ed, Sheila

Are ezca connection errors becoming more frequent?  Ed has had two in the last hour or so, one of which contributed to a lockloss (ISC_DRMI).

The first one was from ISC_LOCK, the screenshot is attached.