The well pump and water system is back up and running normally.

model restarts logged for Wed 03/Dec/2014
2014_12_03 08:33 h1nds0
2014_12_03 09:38 h1dc0
2014_12_03 09:40 h1fw0
2014_12_03 09:40 h1fw1
2014_12_03 09:40 h1iscex
2014_12_03 09:40 h1nds0
2014_12_03 09:40 h1nds1
2014_12_03 09:41 h1broadcast0
2014_12_03 12:43 h1fw0
2014_12_03 13:32 h1iscex
2014_12_03 13:34 h1broadcast0
2014_12_03 13:34 h1dc0
2014_12_03 13:34 h1fw0
2014_12_03 13:34 h1fw1
2014_12_03 13:34 h1iscey
2014_12_03 13:34 h1nds0
2014_12_03 13:34 h1nds1

no unexpected restarts. Completion of minute trend offloading on fw0/nds0. Completion of code changes for end station ISC models (with associated daq restarts). Conlog frequently changing channels report attached.

Dave O. Elli, Daniel, Kiwamu,

We briefly checked how lossy our arm cavities are by locking the individual arm without recycling.

For the X arm:

ASAIR_A_LF = 1180 cnts when unlocked.

ASAIR_A_LF = 1155 cnts when locked.

For the Y arm:

ASAIR_A_LF = 1180 cnts when unlocked.

ASAIR_A_LF = 970 cnts when locked.

We made a corase estimation of intra cavity loss (or a.k.a round trip loss) for the y arm, which is estimated to be about 750 ppm (!). In the calculation, we did not take a mode-mismatch or RF sidebands into accout. We need a closer look at this arm cavity to see why it is so lossy.

Kiwamu, Sheila, Evan, Lisa, Daniel, Elli, Dave O., Dan, Alexa

On December 3rd 2014, 3:01 UTC we had the IR resonanting in all the cavities. MICH, PRCL, and SRCL were still on the 3f signals; DARM was on AS 45Q and CARM was on REFL 9 I at 0 pm. This is what we did:

• We started with CARM controlled by sqrt(TRX+TRY) and DARM by AS 45 Q.
• With the CARM offset at -15, we measured the UGFs of the DRMI loops: PRCL ~80 Hz, MICH ~ 10 Hz, and SRCL ~ 20 Hz (this was with the reduced gain as Lisa noted in the last alog)
• We then compared the TFs between the normalized REFL9 I signal and the sqrt(TRX+TRY) signal. With a gain of -40, the TF was relatively flat (see TRvsREFL_CARM.pdf)
• We also measured the CARM UGF with the CARM offset at -15 and found that the UGF was ~90 Hz with zero phase margin. We turned up the REFLBIAS gain from 0.8 to 1.5; this brought the UGF to 150 Hz with 25 degree phase margin. We also measured DARM at this point and found the UGF of 16 Hz, with a phase margin of 40 deg.
• With a CARM offset of -15.5 we set the normalized REFL 9I offset such that the output was zero, and then adjusted the input matrix to tranistion from sqrt(TRX+TRY) to the normalied REFL 9I into the REFLBIAS input. Finally, we zeroed the offset. We stayed locked for about 12 min. We repeated this and Evan adjusted the offset around to ensure that we were actually at a maximum power build up in the arm.
• As we locked, REFL LF power went from 75mW to 33mW, and TR QPD sum went from 4 to 143 counts. Meanwhile, ASAIR LF stayed constant. We are missing build up in the arm, and the next step will be to investigate this.
• With CARM on REFL was also took several more transfer functions. The CARM TF looked flat around the UGF. We need to improve this loop. Evan will make an attachement with these pdfs. We also need to transition REFL 9I to the analog signal in the summing node board.
• This is all in the guardian now.
• I have attached a picture for good measure.

This morning, after my failed attempt to engage the new LLO-imported filters on the SR3 damping loops, Evan managed to be successful.  Attached is spectra of the SR3 OPLEV PIT and YAW signals comparing the original state of the SR3 (LHO filters and gains, OL damping enabled) with engaging the filters.  Note, I increased the gain to compliment the LLO ones a few hours after we switched the filters and added new spectra.   It does not apear that the new loop filtering and gain are helping, but instead hindering.  Hmm...  I've since dropped the gains back to the original LHO values, and leave it to the commissioners to flip back the filters if they see fit.

Today the fire protection water tank was filled which required the well pump to be switched over to a manual mode. After the tank was filled I was unable to switch the well pump back to the "auto mode" therefore I manually turned the well pump off. The domestic water tank is completely full and there should be sufficient water through the night. We will address this issue in the morning.

I was checking on the HTTS today and noticed that the lockin oscillators for RM1 & 2 were enabled.  It looks like these have been exciting the optics for the last three months.  The plot attached shows the amplitude and frequencies; RM1 was a few Hz, RM2 was a few mHz.  I've zeroed the amplitudes.

Sheila was asking about extra glinting showing up in HAM5 somewhere between the SRM and SR3 suspensions which sit almost side-by-side when viewed face-on from HAM4.  I've dug through the log and have reposted below some HAM5 pics which confirm that

1) the SR3 HR baffle location and orientation look to match the L1 HAM5 position, and the specified mechanical layout drawings of HAM5 (phew)

lho log 12599 pic

2) the baffle does not appear to completely block the line-of-sight to the left edge of the SR3 suspension cage which appears to be light up

llo log 7180 HAM5 pic

I also confirmed that according to E1200145, the SRM, SR2, and SR3 optics all have a vertical wedge, so no secondary back reflections in the cavity should be propogating from the SR optics along the yaw axis.

Although she was specifically asking about light just to the left of the SR3 optic, there are light splashes above the optic on the SUS cage and below the optic on the HAM table, outside of the baffle frame.  It is difficult to see the right edge of the baffle and cage with the existing camera view.  I supect this is just the low power, non-gaussian tail of the beam which the cameras are very sensitive to.  Will have to watch to see if this correlates to anything bad the commissioners see twitching around in the cameras.

07:16 Cris into LVEA
08:06 Karen into LVEA
08:10 Jim B. reconfiguring fw0
08:46 Corey to squeezer bay for 3IFO ISCT work
09:21 Filiberto, Aaron and Sudarshan to end X to power up magnetometers
09:37 DAQ restart
10:03 Gerardo to H2 PSL laser enclosure to work on OFI
10:09 Dick G. to ISC rack 2 to test RF signals
10:36 Betsy taking transfer functions on SR3
10:37 Karen cleaning at mid Y
10:38 Keita to end Y to check cross cabling of green WFS
11:07 Dick G. done
11:30 Karen leaving mid Y
12:06 Corey out of LVEA
12:26 Aaron and Filiberto done, Sudarshan still checking channels
12:34 Sudarshan back
12:35 Keita done
12:56 Gerardo done
13:15 Let truck with portable toilets through gate
13:19 Dan and Rob working on ISCT6
13:32 DAQ restart
14:07 Dan and Rob back