Attached are 7 day pitch, yaw, and sum trends for all active H1 optical levers.  Closing FAMIS #4393.

Notes:

• ETMy YAW has been trending down over the last 2 months (from around 0 to -7).  If +/- 10 is our zeroing no-go, we might have another 3-4 weeks until we get to -10 and will needt to re-zero the yaw for this oplev.

Planned outage for WP #5736 is complete (8AM-8:10AM Pacific). Optical taps were installed between LHO border router and our ISP.

FE watchdog was reset at 16:15UTC. 

FAMIS: https://ligo-wa.accruent.net/LB_Request_Update.asp?RequestID=3586

Den, Sheila, Evan

~> We tried reverting to the old QPD offsets (the ones we used throughout O1) for the soft loops and the PRM pointing loops. These seemed to make the recycling gain slightly worse, and did not improve the jitter coupling. This indicates that (as we had suspected) these offsets are no longer good to use.

~> We measured the 9 MHz oscillator phase noise coupling into DARM. This had been done previously (19911), but with a suspicious calibration and in a way that also drove the 45 MHz phase. This time, we used the OCXO to drive both the harmonic generator (bypassing the 9 MHz distribution amplifier) and to serve as a reference for an IFR/OCXO PLL with a >40 kHz bandwidth. The IFR is used to drive the 9 MHz distribution amplifier. The error point of the PLL was offset in order to maintain the relative time delay of the 9 MHz and 45 MHz signals. When we relocked, we found that the 18 MHz and 27 MHz signals had flipped sign, but otherwise the interferometer locked normally. However, there was a great excess of 45 MHz noise in DARM (worse even than before we installed the 9 MHz bandpass). Nevertheless, we were able to drive enough to see the effect of 9 MHz phase modulation in DARM. The coupling is roughly 2–4×10⁻⁶ mA/Hz above 100 Hz.

TITLE: 2/23 eve Shift: 00:00-08:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
QUICK SUMMARY: Commissioners doing their thing for my whole shift.

Log:

• 01:27 Kyle to MY for CP3 overfill
• 01:48 Kyle back
• 02:14 Evan to CER
• 02:30 Evan out
• 05:10 Evan, Sheila to CER
• 05:41 Evan, Sheila out
   

Following up on Andy's earlier posting and building on data-folding infrastructure 
he has been developing, Weigang Liu has tried folding the same three channels Andy examined, 
but folding daily and monthly over most of the O1 data set
(ignoring January data to avoid confusion from calibration / post-O1 studies).
Weigang sees similar behavior in each channel to what Andy found in a half-hour sample, 
but with some variations during the course of the run.

In brief, Weigang uses a Matlab script to read in full PEM data or observing-mode DARM-related channels,
folds it upon itself in 4-second intervals, computes an FFT of the folded data, excises unwanted
bands, then inverts the FFT to get a band-passed/low-passed/high=passed time series. Discontinuities
at starts of science segments are handled with a smooth ramping, and the 4-second intervals are
shifted by a half-second to avoid artifacts on integer-second boundaries due to the data processing.
All 4-second intervals are synchronized to be commensurate over gaps in data.

Attached below and linked here are summary plots for Sept-Dec 2015 for two magnetometer channels (40-Hz low-pass):
H1:PEM-EY_MAG_EBAY_SUSRACK_QUAD_SUM_DQ
H1:PEM-EY_MAG_EBAY_SEISRACK_QUAD_SUM_DQ
and a summary plot for Sept-Dec 2015 for the DARM-related suspensions channel (10-50 Hz band-pass):
H1:SUS-ETMY_L3_MASTER_OUT_LL_DQ

Corresponding monthly and daily plots can be found by drilling down at these links:
H1:PEM-EY_MAG_EBAY_SUSRACK_QUAD_SUM_DQ
H1:PEM-EY_MAG_EBAY_SEISRACK_QUAD_SUM_DQ
H1:SUS-ETMY_L3_MASTER_OUT_LL_DQ

1730 - 1742 hrs. local -> To and from Y-mid 

Took 2 min 30 secs to fill @ 1/2 turn open.  Next overfill to be Wed., Feb. 24th before 4:00 pm (local) 

No vacuum people on site during the day today -> Good catch by the aware operator - TJ -thanks TJ

C. Cahillane

I have removed a double-counting error found in the final total uncertainty budget.  All of the original fits for each component remain the same, but the final budget is reduced for each actuation stage and the sensing function by a little under a factor of sqrt(2).

I have posted the new results below for C01, C02, and C03.  You can run the updated code at the calibration SVN:
aligocalibration/trunk/Runs/O1/Common/MatlabTools/strainUncertainty_Final_O1.m

For the equivalent LLO Budget please see aLOG 24915.

I have subtracted  SRCL coupling from DARM, and found that residual noise has the shape of 1/f^4-5 at 15-30Hz. I remember when L2 was in acquire state we could see actuator noise in this frequecy band in DARM. For this reason I decided to look into L2 noise again even though actuators are in the low noise (state 3) during current locks.

All 16 actuators show similar noise levels. Attached plot shows spectra for one of them (ITMX LL) in different states. When there is no control signal, actuator noise in low noise state is a factor of 10 smaller compared to acquire state in the frequency range 10-30Hz. However, if a small (few counts) low frequency excitation is applied, then actuator noise increases by a factor of 10. The noise increases almost by the same level if a large excitation is applied. I decided to check if upconversion happens in DAC, actuator or noise monitor. Control signal was shifted by a DC offset (10000 cnts) and actuator noise has reduced by a factor of 2-3. From this measurement one might conclude that DAC is responsible for extra noise. Also, we run oplev servo on the ITMs and even though control signal is aggressively low passed, actuator noise still increases above 10Hz.

Since L2 actuator noise depends on the low frequency control signal (or DC offset), then actuator noise may or may not be coherent to DARM at 10-30Hz. However, when we looked at DARM spectrum with bandwidth of 1Hz, we saw that noise goes up and down by a factor of 1.5 at 10-30Hz.

15:20 UTC Chris S. starting beam tube tunnel sealing (first 150 yards of X arm)
16:19 UTC Elli, Cao to Y arm TCS table to check beam
16:39 UTC Elli and Cao back
17:21 UTC Ed and I done transitioning LVEA to laser safe, Bubba and John starting crane shimming
17:45 UTC Richard to H1 PSL enclosure to check door lock
17:50 UTC Kiwamu, Elli and Cao to LVEA to turn on Y arm CO2 laser
17:51 UTC Richard back
17:57 UTC Kiwamu, Elli and Cao back
18:07 UTC Karen and Christina opening OSB receiving door to bring in 51 lb package
19:01 UTC John and Bubba done for the day
19:26 UTC Dave rebooting hardware injection machine (WP 5740)
19:53 UTC Dave done
21:20 UTC ASCIMC model restarted
21:22 UTC LSC model restarted
21:24 UTC DAQ restart
21:32 UTC Kiwamu transitioning to laser hazard
21:39 UTC Kiwamu done transitioning to laser hazard, Elli and Cao to ISCT6
22:03 UTC Vinny and Brynley to end Y, opening middle rollup door to move temporary magnetometer

- beam tube tunnel sealing (Chris S.)
- crane work (John, Bubba)
- TCS work (Elli, Cao)
- ASCIMC and LSC model changes (Sheila)
- PEM work (Vinny and Brynley)
- tconvert fix (Dave)

Laser Status:
SysStat is good
Front End power is 32.51 W (should be around 30 W)
Frontend Watch is GREEN
HPO Watch is RED

PMC:
It has been locked for 18.0 days 6.0 hours and 18.0 minutes (should be days/weeks)
Reflected power is 3.157 W and PowerSum = 25.62 W.

FSS:
It has been locked for 0.0 days 6.0 hours and 3.0 minutes (should be days/weeks)
TPD[V] = 1.476 V (min 0.9V)

ISS:
The diffracted power is around 7.85% (should be 5-9%)
Last saturation event was 0.0 days 6.0 hours and 3.0 minutes ago (should be days/weeks)

Evan, Sheila

We made some changes to the LSC model and medm screen as described in ECR 1205.  The main goals were to split the SRCL FF filter into two parrallel banks, so that one can be used for the low frequency feedforward that needs to be tuned as the darm offset is changed and the other can be used for the high frequency part that we don't expect to change much as we change the DARM offset and power up.  I also added a power recycling gain monitor, based on POP A LF divided by IM4 trans sum.  For this we had to add an IPC send to the IMCASC model, an a receive to the LSC top model, in addition to the modifications to the LSC common model.  Both the models and medm screens are checked into svn. Evan also added a PRCL FF path to the FF medm screen, but it is not in the model.

I calibrated the PR gain by looking at a recent lock stretch, taking the average of the normalized arm transmissions and multiplying them by the PRM transmission (2.7%) to get the recycling gain, and then finding the factor needed for the new monitor based on that.  

(Keita Daniel)

We mounted the 9 MHz RF AM Stabilization chassis in the CER in preparation of tomorrows installation in the PSL enclosure. The remote control is working fine.

Comment 1: The little back panel PCB became loose during shipping and needed to be reseated. It is important to make sure it is correctly centered, since the connectors are not keyed (the power supply will blow, if it is shifted by one).

Comment 2: In a Frankenstein experiment someone disassembled the high power sensor for the RF power meter and then equipped it with a different sensor head. Please don't. The sensor head and power attenuator constitutes a single sensor and should never be taken apart.

A while ago I worked on feed forward from BSC St1 sensors to St2 in Z. I've installed this and it has been running on all BSCs for a while, but I have taken my time in logging it. Attached spectra show the improvement, where dashed is on (ground STS and St2 gs-13s) and solid is off. Almost an order of magnitude improvement over 10 to 25 hz. It does do slightly worse at 4-5 hz, because of gain peaking, but we are mostly into gs13 noise at that point anyway. I've worked some on other DOFs, but Z was the easiest to do with the worst performance. In X&Y the existing controls already mostly keep us in the GS13 noise, so the room for improvement is smaller.

FRS 4412

A new environment variable, TCLEAPSDIR, has been created with the value /ligo/data/tcleaps.  This is to get all versions of tconvert to use the same leap seconds file instead of having a separate file for each operating system.  This is the first step in solving the issue described in the FRS 4412.

The CO2Y laser RTD sensor tripped and shut off the laser on 19 Feb 17:52 UTC.  We restarted the laser on 22 Feb 18:00 UTC.  The RTD sensor is a temperature sensor mounted on the CO2 laser viewport.  It's pourpose its to shut off the CO2 laser if the laser is heating this vieport. However  I don't think this is what happened here, because now we are using the CO2Y laser to heat the ITMY and the RTD sensor has not tripped.

BSFM and QUAD AUX model revert (Tuesday) (Jeff K.)
Crane work (potential all week) (John, Bubba)
X arm ion pump is still down from cable short
Retrieve spare PMC from H1 laser room (Tuesday) (Rick)
Short internet outage (Tuesday 8:00 am) (Ryan)
Dust monitor work at one of the end stations (Tuesday) (Jeff B.)

Den, Kiwamu, Evan

We continued investigations into locking robustness and low-frequency noise.

Notes on robustness:

>> Engaging the soft loops is still painful, particularly in yaw. When the loops are ramped up to their nominal gains (a few tens of millihertz bandwidth), the SRM yaw loop misaligns the SRM in yaw, which causes POP90 to rise and causes lockloss after about 1 minute. If the SRM yaw loop is turned off, this misalignment does not occur. So far, the most reliable way to engage the ASC is to (1) engage the soft loops with the −20 dB filters, and let them run for a few minutes, (2) turn off the SRM yaw loop, (3) turn off the −20 dB filters in the soft loops, and then (4) once the soft loop error points have reached 0, turn the SRM yaw loop back on. This has not been added to the guardian.

>> Den retuned the PR2 actuator feedforward which decouples MICH from PRCL, but this has not been added to the guardian yet.

Notes on noise:

>> Similar to yesterday's frequency noise test, we injected high-frequency noise into the ISS first-loop error point. We drove several volts (both sine waves and broadband noise) up to 10 MHz, but we did not see any nonlinear coupling.

>> As noted previously, the input jitter coupling into DARM is worse than before, particularly in pitch. Den opened the SRM angular loops and moved SRM to minimize the coupling. However, this seemed to make the noise worse in other places. In particular, the region from 35 Hz to 70 Hz swas dominated by some kind of nonstationary excess (perhaps scattering in HAM6). Also, there appeared to be a slight excess frequency noise above 5 kHz.

>> We drove the ITM ring heaters (upper and lower) in common-mode in order to measure the voltage-to-displacement coupling in DARM. By driving a few lines at 250 mVpk between 80 and 160 Hz, we could see that the coupling goes like 1/f². The levels at 160 Hz are as follows:

>> We flipped the sign of the DARM offset. Normally we run with the X arm shorter than the Y arm (i.e., a positive offset is applied at the DARM error point, and DARM is Lx − Ly); so here we are running with X arm longer than Y arm. This is achieved with the ISC_LOCK paramter lscparams.omc_sign that is applied at the appropriate points during the dc readout handoff. The sign of the SRCL feedforward also has to be flipped, and the SRCL FF filters that we normally use cause some 1 Hz instability that unlocks the interferometer. We installed a more aggressive AC coupling filter (FM8), and this solved the issue. DARM has a small amount of excess noise with this new offset, but the SRCL coherence does not seemed to have changed much after FF retuning. Good time to look at is 2016-02-21 21:44:40 (bruco).