The slow controls SDF IOCs have been updated to a newer release.  It is running RCG from trunk at revision 4114.

The SDF IOCs are configured to load straight to the OBSERVE.snap file (skipping the safe.snap which we do not use).

Changes:

• Autodetection of channel types (eases sysadmin workload).
• Fixed a bug with revert that was discovered last power outage.
• Better precission in the saved snap files.
• Configured to load OBSERVE.snap.

With the precision changes I have accepted all numeric differences smaller than 10^-16.   These should not need to be accepted again until there is an actual change.

I ran BruCo on half a hour of data starting at GPS 1138960800. The full report is available here:

https://ldas-jobs.ligo.caltech.edu/~gabriele.vajente/bruco_1138960800/

Some interesting things:

• there's again significant coherence with DHARD_PIT at low frequencies. Maybe the P2L gains have changed again? It would be good to check if ETMY is again the culprit. If so, it might indicate something wrong with that suspension. Fig. 1
• SRCL and MICH seem far enough from the measured noise. Fig. 2
• some other angular degrees of freedom start to show (low) coherence, like CHARD_Y and SR2_Y. Fig. 3 and 4
• There is some (low) coherence at low frequency (mostly <15 Hz) with ISI-GND_STS_HAM5. Fig. 5
• The 1 Hz comb of lines is very well visible in many magnetometers, mostly PEM-EY_MAG_EBAY_SEIRACK. Fig. 6
• At the beam jitter periscope peaks, there is coherence with IMC degrees of freedom. Maybe it's time to optimze the IMC alignment. Fig. 7

Related: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=25449

This morning Richard swapped the whitening chassis with the correct variant. Whitening seems to be working for all quadrants of 90MHz AS_A and AS_B.

WP 5727

Yesterday Daniel and I changed h1ecatc1 PLC2 to replace IscRfCSpareAmp[1] of IscRfCSpareAmp[1..5] with IscRfCAsAmp90m. This morning I rescanned PLC2 in the system manager and added the links for IscRfCAsAmp90mIn and the lost links for the remaining IscRfCSpareAmpIn (now IscRfCSpareAmpIn[1..4]).

IscRfCAsAmp90mIn.OutputMon linked to Corner Chassis 6 L1 Channel 4
IscRfCAsAmp90mIn.PowerOk linked to Corner Chassis 6 L3 Channel 4

IscRfCSpareAmpIn[1..4].OutputMon linked to Corner Chassis 6 L2 Channel 1..4
IscRfCSpareAmpIn[1..4].PowerOk linked to Corner Chassis 6 L4 Channel 1..4

The wiring diagram also needs to be updated to show that IscRfCTcsAom40mIn.OutputMon is linked to Corner Chassis 6 L1 Channel 3 and IscRfCTcsAom40mIn.PowerOk is linked to Corner Chassis 6 L3 Channel 3.

Since everything was restarted I burtrestored PLC1, PLC2 and PLC3 to 6:10 this morning local time.

I reset the PSL 35W FE power watchdog at 17:55 UTC (9:55 PST).

BS had saturation count of 712 & was RESET.

H1 was down overnight.

Observatory Mode was Preventative Maintenance when I arrived.  

A few activities were already started (beamtube sealing, dust monitor work, & crane work).  We also transitioned to Laser SAFE.

Now we other activities are starting to roll in.

All time in UTC

00:12 Kyle fill out CP3, then head to EY

00:20 Elli & Nutsinee to HAM6 to adjust AS Air camera

00:44 Robert to EY debugging seismometer

00:51 Kyle back from EY

01:18 Robert back

01:20 Robert head back to EY

07:50 Lost lock trying to engage ISS 2nd loop. Too tired to relock. Leaving the ifo DOWN for the night. Evan switched RF45 modulator to OCXO.

Note for Day Shift Op: There were two relocks during my shift, roll modes were high both times. Engage DC READOUT with caution. Maybe it's a good idea to hang out at BOUNCE_VIOLIN_MODE_DAMPING for a while?

Related: 20559, 19911

Summary

I remeasured the RFAM-to-DARM TFs for the 9 MHz and 45 MHz sidebands.

The 45 MHz measurement agrees with the previous result of ~0.1 mA/RAN. However, the 9 MHz measurement is also ~0.1 mA/RAN, which is a factor of 10 higher than what was measured previously. Note that the previous "9 MHz" RFAM measurement was really a simultaneous measurement of 9 MHz and 45 MHz RFAM, since we had no 45 MHz RFAM stabilization in place.

Details

For the 45 MHz measurement, I injected into the error point of the 45 MHz RFAM stabilization servo and measured the TF from the OOL RFAM stabilization detector (which is already calibrated into RAN) to the DCPD sum.

For the 9 MHz measurement, I temporarily replaced the OXCO with an IFR running at 9.1 MHz and +10 dBm. Then I used the spare DAC channel to inject into the IFR modulation port, which was set to 10 % deviation, dc-coupled (which means a RAN of 0.071 for 1 V of input, though I did not measure this directly). The signal from the spare DAC is buffered by an SR560 and sent back into one of the spare ADC channels. Then I measured the TF from the spare ADC channel to the DCPD sum. This measurement relies on the 45 MHz RFAM servo suppressing the resulting fluctuations in the 45 MHz sidebands before they are applied to the EOM; looking at the OOL readback, this seems to be satisfied below 1 kHz. Above 1 kHz, there is a RAN increase of <2 compared to no 9 MHz injection.

Templates live in my folder under Public/Templates/Osc/(45|9)_RFAM_2016-02-08.xml.

1615 - 1650 hrs. local -> To and from Y-mid + Y-end 

Next over-fill to be Wed, Feb. 10th before 4:00 pm

[Keita, Jenne, Daniel]

We looked into the electronics for the new AS 90 MHz WFS, and found 2 mixups.  One we fixed, the other we ask Fil to fix tomorrow during maintenence. 

The cable for the binary I/O for AS B 90 was plugged into BIO 2, chassis 6.  However, according to E1300079 it belongs on BIO 4, chassis 4.  We made this swap, and the AS B 90 channels now look good, and respond to changes in the whitening state.

Half of the AS A 90 channels are still not good.  The problem seems to be that instead of the "normal" D1002559 whitening chassis, the "split variant" whitening chassis was installed.  These have the same DCC number, but the input panels and input adapter boards are totally different. For the normal version, all 8 channels are connected to the single input connector.  For the split variant (which is designed for use with the OMC DCPDs) 4 channels are on each of the 2 input connectors.  So, Since all 8 of our WFS signals are on one cable, 4 of those signals (I3, Q3, I4, Q4) are just going nowhere.  Anyhow, if Fil / Richard could put the normal variant of the whitening chassis in tomorrow during maintenence, we should be good to go with trying out our new AS90 centering loops.

Also, AS B Q1 signal looked dead, but after pushing the whitening cable in more, it is now fine. 

(All Times in UTC)

H1 locked for 12+hrs when I walked in & in Observe for Intention Bit & "Logging" for Observatory Mode

• 15:20 Beam Sealing work begins; 100yards from EX (Chris S)
• 15:59 EX & then EY compressor room (Ken)
• 16:06 -16:30 Jim switched SEI ISI Blends (Jim)
• BS Upconversion investigation (Robert) 
• 16:32 Lockloss due earthquake (6.3 Papua New Guinea) ITM/ETMx & BS were taken to DAMPING until 0.03-0.1Hz noise approached 0.1um/s.
• 18:00-18:18 Phase measurement from oscilator ->DARM (Evan)
• 18:20-19:30 ISCT6 Camera work (Elli & crew)---be mindful if image looks different (i.e. position/exposure)---Actually Elli/Nutsinee going to fix this.
• 18:22-19:45 Getting stuff from EY to take to EX. (Kyle)
• 18:25-19:25Attenuators installed at ISCT6 rack (Jenne/Sheila)
• 18:45-20:15 MY to move a ground wire up (Ken)
• 18:50 Burying a seismometer at EY (Robert)
• 19:11-19:30 BS ISI Transfer functions (Jim)
• 19:12 Retrieving Nitrogen bottle in LVEA (Betsy)
• 19:19 Control Solutions on-site (Bubba)
• 21:40 90MHz work at HAM6 (Keita, Jenne)

Made a few attempts at taking H1 to NLN, but dropped out due to an earthquake.  Sheila also checked on PRMI transitions.  

Per FAMIS request 4391, attached are oplev 7-day trends.

Robert, Dave:

During O1 the spare ADC channels in the end station PEM models were zeroed out so their science frame data payload was be compressed to zero. During the current inter-run commissioning period, all 6 ADC channels at each end station are now active. The SDF files h1peme[x,y]_OBSERVE.snap were updated to zero the SDF diffs and permit observation mode.

Elli, Cao

I have moved the AS_Air camera 30cm along the beampath, to optimise this camera location for an SRC gouy phase measurement.  See attached photo.  The camera is now 20cm in front of the beam waist, instead of 10cm behind it.  We now measure 10.4cm between the beamsplitter (to CAM_17) and AS_Air.
  I have left some clamps in place to mark the original position of this camera, so we can move it back quickly if necessary.

OPERATORS NOTE:  The spot position on the AS_Air Camera will now be somewhat different.  Take note during during the intitial alignment stage.  When aligning the BS, the beam now looks brighter on the AS_Air camera.

I have analyzed some initial measurements from the fast polarization photodetectors (from a lock-stretch on Sat 31st Jan: centered around GPS = 1138230306). The channels H1:TCS-IFO_POLZ_P_HWS_OUT and S_HWS_OUT are the respectively powers measured by the P- and S- photodiodes (in Watts - accounting for the dewhitening and response of the photodetectors).

The absolute level of noise of S and P on the table is roughly the same, albeit with distinct differences in the spectra. The relative intensity noise, on the other hand, is an order of magnitude larger in the S- polarization than in P.

Also shown is the coherence between S and P. The fact that the coherence isn't very large indicates that something (either in the interferometer or the output chain after the BS_AR reflection) is injecting more noise on the S- polarization than on the P-polarization. Obviously, this needs a more detailed investigation.

Lastly - the model includes an estimate of the noise in the polarization angle at the AS port (AS_RN) - this is important because it is close to what the OFI will see and convert to intensity noise at the output of the OFI. In the horizontal axis, we're limited by sensing noise above 4Hz.

The DC level of polarization rotation at the OFI, theta_DC, is around 0.09 rad (5.2 deg) in the middle of the lock-stretch. The estimated intensity noise on transmission through the OFI is 2*theta_DC*AS_RN and is shown in the attached spectra.

Power

RIN

Coherence

Polarization induced RIN after the OFI

[Jenne, Sheila]

We measured the drive to the 90MHz distribution amplifier, and gave it a 2dB attenuator so that we are now driving the distribution amp with 10dBm rather than 12dBm.  We re-measured the outputs of the distribution amplifier, and now they were a little over 12dBm.  So, each output of the distribution amplifier got a 2dB attenuator, so each of the demod boards is getting the 10dBm that they want for their local oscillators. 

Again Masayuki.Nakano reported with Stefan's account

Kiwamu, Masayuki

We measured spectrum of the OMC DCPD signals with a single bounce beam. It would help a noise budget of a DARM signal.

What we did

1. Increase the IMC power
IMC power was increased up to 21W. Also H1:PSL-POWER_SCALE_OFFSET was changed to 21.

2. Turn of the guardian of isc-lock
Requested 'DOWN' to the isc-lock guardian to not do anything during the measurement.

3.Miss align the mirrors
For leading the single bounce beam, all of mirrors were misaligned by requesting 'MISALIGN' to guardians of each mirrors except for ITMX.

4.Aligned the OM mirrors
When we got single bounce beam from IFO, there was no signal from ASC-AS-A, B, C QPDs initially. We aligned OM1,OM2,OM3,OMC suspensions with the playback data of OSEM signals

5.Locked the OMC
The servo gain, 'H1:OMC-LSC_SERVO_GAIN', was set to 10 and master gain of the OMC-ASC was set to 0.1.
The DCPD output was 34 mA.

6.Measurement (without a ISS second loop)
The power spectrum of below channels are measured. Measurement frequency was 1-7kHz and BW was 0.1 Hz. The measured channel was as below.
H1:OMC-DCPD_SUM_OUT
H1:OMC-DCPD_NULL_OUT
H1:PSL-ISS_SECONDLOOP_SUM58_REL_OUT
H1:PSL-ISS_SECONDLOOP_SUM58_REL_OUT was used as the out-of-loop sensor of the ISS.

7.Closed the ISS second loop
The ISS second loop was closed. The sensors used to gain error signal was PD1-4.

8.Measurement (with a ISS second loop)
Same measurement as step5. In addition to that, the coherence function between DCPD-SUM and SECONDLOOP_SUM was measured.

Discussion

I scaled out-of-loop sensor signals of ISS, i.e. the residual intensity noise after the ISS second loop, to the same unit as OMC-DCPD signals. The scaling factor was estimated by dividing the H1:OMC-DCPD_SUM_OUT spectrum (without ISS) by H1:PSL-ISS_SECONDLOOP_SUM58_REL_OUT spectrum (also without ISS) at 100Hz.
I scaled those spectrum both (hereafter 'both' means with and without closing ISS) by same scaling factor.
You can see the DCPD-SUM spectrum, DCPD-NULL spectrum and scaled second loop ISS out of loop sensor signals in attached plots.

The both NULL signals agree with the shot noise of a PD with 34mA signal (cyan curve) above 30Hz, and below that it would be limited by ADC noise.
About the SUM signals, it seems to consistent with the scaled intensity noise above 300 Hz. Also they have some coherence between the intensity noise and the OMC PD signal upper than 300Hz(see another plot). On the other hand, there seems to be some unknown noise below 300 Hz when the second ISS loop was closed.

Possibly this unkown noise might come from the length motion of the OMC. I attached another plot. This plot is the one of same channel(upper) and the OMC error signal with a different servo gain of OMC LSC loop. The error signal and DCPD-SUM signal seem to have similar structure around 100Hz. I haven't any analysis yet because these plots are measred after whitening filter had some trouble and we are planing to do same measurement again with whitening filter.