The mount for the PZT in the IO path on the PSL, IO_MB_M4, was swapped from the 2" mirror and the damped mount to the new PZT mount.

Aligning with the new PZT mount is challenged by having to remove the entire mount from the table, to access the bolts underneath, to adjust the +/-X position.  There was also a change of the beam alignment when securing the bottm plate to the table.  The beam was carefully aligned to IO GigE camera 2 and camera 3, and when the bottom plate of the new mount was secured to the table, the beam was gone from both cameras, and an offset was introduced into the IMC_IN beam.  With the PZT it was possible to restore a beam to IO GigE 2, the camera that is on the bottom periscope transmitted beam.  It was not possible to restore both camera images with the PZT.  This indicates that the change in IMC_IN position and angle are due to the PZT swap.  It was past noon, so the decision was to leave this change as is, lock the IMC, and evaluate how it and the beam downstream was affected, instead of using M3 and the PZT on the PSL, to restore an image to both cameras.  The change in IMC_IN on the iris at the bottom periscope was identifiable as yaw with an IR viewer.

The reference beam from the shutter (between the PSL and HAM1) was recorded before and after the PZT swap.  Those pictures show the difference is between the before and after beams is 1mm and 2mm in pitch and yaw (image attached).

Sheila and JeffK moved IMC DOF, Corey and JeffK started an initial alignment, and now the effort is to lock.

BEFORE reference time 12/11 18:00 UTC, AFTER reference time 12/12 1:24 UTC.  A snapshot showing IMC WFS, IM4 Trans, and ISS Second Loop QPD signals is attached.

- Cheryl, Jason, Keita

TITLE: 12/11 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
INCOMING OPERATOR: None
SHIFT SUMMARY:

CDS Notes:  (1) Reservation System would randomly go blank.  (2) Camera system would switch to access system at inopportune times (icon on bottom would flash orange & then stay solid...maybe for alarm?).
LOG:

• 15:30 Photo-taking for ITMx & ITMy (JeffB)
• 15:45-18:50 EX temperature sensor installed on Pcal (RichardM)
• 15:46 Moving scaffolding out of LVEA (Chris)
• 16:02 ISI transitioned to SC_OFF_NOBRSXY
• 16:15-16:18 Attempted ETMx/y charge measurements but voltage change work began (Corey)
  • Alignment restored
• 16:17-20:30 Making modifications for voltage change at EX & EY (Marc, Robert, Ed)
  • EY oplev glitch check on cable (Ed)
  • 16:37 EY high voltage off (Marc)
  • 17:30 Returning to EY to install chassis (Marc)
  • Starting same work at EX
  • 19:28 heading to EX to install chassis, and then to EY to finish cabling (Marc)
• 16:19 Cleaning starts (Vanessa)
  • 16:30 - 17:10Y-arm cleaning (Karen)
• 16:40-17:40 Dust monitor move in diode room (Jeff)
• 16:45 PSL periscope mirror swap (Cheryl, Keita)
  • 17:32 Marking beam onH1 PSL wall from AR viewport on HAM1. (Keita) 
• 17:05 ISCT6 work (Nutsinee & Terry)
  • Terry & Nutsinee went in and out throughout day.
• 17:07 "74" (aka CP3) LN2 fill
• 17:14 Bagging fiber stuff at HAM5 (tj, terry)
• 17:15-21:38 EY Pcal work (rick, sudarshan, niko)
• 17:16-18:47 Illuminator chassis removal at Input rack (Ed)
• 18:20 HAM456 ISI work (jim)
• 20:20-21:25 etmX charge measurement (patrick)
• 21:10 Recovering beginning:  Models, daq restarts, IMC locking
  • Step#1 Initial Alignment  (Corey, JeffK, w/ help from Hang & Jenne)
  • Fairly straightforward by following our Init Alignment checklist (T1600483v3).  Have a few notes to add to this for a v4 (this is my action for tomorrow).
  • 0:00 Initial Alignment complete & handing off to JeffK for LOCKING

Addressed TCS Chillers (14:12-14:22 PST today)

• TCSx Chiller:  No Change
• TCSy Chiller:  9.6cm---->  Filled up to 10.cm by adding 200mL  (measurements via eye-balling the center of the red floating ball).  First adding of water since 10/29/18.

I disconnected the existing temperature sensors and installed a temporary units right at the 9 pin connectors on the interface chassis.  Monitoring the channels indicated they were much quieter with this setup so I do not think it is the ADC.  Next Tuesday will attempt another experiment with neighboring channels to test for source of glitches.

Ed, Marc, Richard

The ESD Driver (D1500129) LED limiting resistors were increased to handle 48V per WP7993.  The new +/-48V and +/-18V supplies were also connected and powered up.

The LED modification was applied to the following chassis:

S1500073 - EX

S1500066 - EY

S1500070 - Spare

WP7984 h1lsc add fast channel

Daniel, Dave:

a new h1lsc model was installed, adding a missing 16k channel to the DAQ.

WP7995 OMC drumhead beason alignment

Keita, Dave:

New h1omc and h1omcpi models were installed.

WP8003 HAM6 Septum Accelerometer

Richard, Dave:

h1pemcs model was changed to add H1:PEM-CS_ACC_HAM6VAC_SEPTUM_Y (acquired at 4kHz). We are using the 11th channel of the 6th ADC.

WP8002 Fader code debugging, temporary add ISI ETMY fast to DAQ

T.J. Dave:

h1isietmy model was changed to add two temporary fast channels for debugging.

Beckhoff SQZ code change:

Daniel, Patrick, Dave:

h1ecatc1plc4 code was changed, and new DAQ INI file was created.

DAQ Restart:

Dave

DAQ was restarted at 13:25 for new h1lsc, h1omc, h1omcpi, h1pemcs, h1isietmy, h1ecatc1plc4 code.

Corey, Patrick

I was able to get four measurements without reported errors:

data_2018-12-11-20-23-10
data_2018-12-11-20-37-18
data_2018-12-11-20-51-21
data_2018-12-11-21-05-21

There were a number of errors running the long trend script. I have copied the output into the attached long_trend_log.txt.

Patrick, Ed, Richard

I moved the link in the h1ecatc1 system manager for 'I/O Devices -> Vertex Auxiliary -> Auxiliary LVEA Hub 1 -> Illuminators Input -> Channel 1 -> Output' from 'PLC1 -> Standard -> Outputs -> PslNoiseEaterOut -> IlluminatorRelayOn' to 'PLC1 -> Standard -> Outputs -> HAM1IlluminatorOut -> IlluminatorRelayOn'. I committed the change to svn and restarted. I ended up having to restart the computer, as the LIGO TwinCAT Target Configuration GUI was taking a really long time on 'Activate and run'.

I tested turning on and off the HAM1 illuminator through MEDM, and light appeared and disappeared on some of the camera images.

Took pictures of face of ITM-X and ITM-y under green light as the IFO unlocked while setting up. Will try to get a set of shots under IR at at least 20W before the holiday break.

There are two shots of each optic at different exposures and focus points.

Have a few oplevs which are approaching their +/-10urad limits, so these could be centered.  Mentioned this to Ed, so it is on his list for next target of opportunity (which could be today for some...)

Pitch Notes:

• ETMx hovering near -10.
• ETMy close to -10
• ITMx close/at -10
• BS close to -10

Yaw Notes:

• ETMy near +10

Nutsinee Daniel

We identified some of the laser power drift that we observed after the (red) EOM to be due to a small polarization error and the birefringence of the EOM. Due to a manufacturing error in the Faraday isolator preceding the EOM we need to rotate the polarization prior to the EOM. We are using a lambda-half plate but it is not easy to adjust, since we don't have a convenient polarizer in the path. This introduces a small polarization error incident to the EOM. The birefringence of the EOM will then introduced a drift in the polarization due to temperature variations, it will introduce polarization noise due to the TTFSS feedback path to the EOM, and it will introduce RFAM for the SHG modulation frequency. Variations in the polarization angle are then converted into intensity variations by downstream polarizers—compounded by the waveplates which are used for power adjustments.

PCal crew not able to call control from from EY VEA (eventually used phone at entrance of EY).

Laser Status:
Front End Power is 32.61W (should be around 30 W)
70W Output Power is 71.3W
Front End Watch is RED
70W Watch is GREEN

PMC:
It has been locked 2 days, 17 hr 3 minutes (should be days/weeks)
Reflected power = 13.38Watts
Transmitted power = 51.76Watts
PowerSum = 65.15Watts.

FSS:
It has been locked for 0 days 1 hr and 19 min (should be days/weeks)
TPD[V] = 3.522V (min 0.9V)

ISS:
The diffracted power is around 2.8%
Last saturation event was 0 days 0 hours and 29 minutes ago (should be days/weeks)
Possible Issues:  No issues to report.

Alog from yesterday morning, forgot to post.  No exciting details though.

• Offloaded SOFT offsets to QPDs from dof input offsets. (Typo, so lost lock...)
• Lost lock at coil drivers - looked maybe like a pitch instability?
• Ran A2L at 20W with SOFT loops closed and converged.  Set new SOFT dither line amplitudes and demod phases.  Demod output doesn't seem to cross zero which might be due to the A2L being set at 30 Hz and the dithers being run at 7.5-8.5 Hz.
• Struggling with the Offload_DRMI_ASC state again, need to rephase AS36.  Changed by 25 deg, also put in input limiters to reduce the transient when we turn the MICH ASC loops back on.
• Lost lock a few times at NomLowNoise trying to open the SOFT loops.  Not sure why. 

Hang and I tried a few more times to set up the SOFT dither loops, without success / understanding so far. We'll try again this afternoon after maintenance.

TITLE: 12/11 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Preventive Maintenance
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    Wind: 8mph Gusts, 6mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.42 μm/s
QUICK SUMMARY:

H1 dropped out 15:42utc (Richard said it was him installing temperature sensor on PCal at EX, but we also have Chris moving scaffolding...but that was probably a little bit later).

Pfieffer is onsite for MX VAC work.

This is a follow up on 45768.

I plotted the TF from frequency noise to DARM with different DARM offsets from two nights ago in hopes of understanding our high-frequency frequency noise to DARM coupling.  This has only raised more questions.
Our freq to DARM coupling appears to be moving at both high and low frequency by about a factor of 2 on the order of 5 minutes.  Unclear why.

Some details about the measurements:
REFL SERVO ERR Calibration 
(the ADC and whitening gain of 200 are accounted for in the filter module now)
--------------------------------
SumNode = dB2Mag(8.0) # V/V
REFL9Trans = 2900. # V/W
REFL_A_B_BS = 0.5 # W/W, half light on REFL A
CARMgainDC = 15.5e-3 # W/Hz
CARMpole = 0.6 # Hz

Injection Time per Measurement: ~200 s 

The measurements were not really taken in a sensible order, I took the 15.9 pm offset measurements all first, then the 1000-7000 Hz 11.4 pm meas, then the 1000-7000 Hz 3.8 pm meas, then the rest of the 11.4 pm. I mention this because the freq to DARM coupling seems to change more with the time the measurement was taken than anything else.

Questions
1) The linear coupling appears to change significantly between measurements.  While the DARM offset changes may be able to explain some of the coupling change, there are swings completely independent of the DARM offset.  These measurements were taken ~two hours after we had locked at 20 W, so the swings are probably not thermal either.
2) There are changes in the linear coupling at both low and high frequency.  The low frequency is thought to be dominated by radiation pressure/contrast defect effects.  The high frequency coupling is not understood, and thought to be dominated by higher-order-modes, but we have no theory of this.
3) The nonlinear low-frequency coupling for the 1000-7000 Hz injections is probably due to excess OMC length control sensing noise from the frequency noise.  However, it doesn't decrease fast enough with increased DARM offset.  More data needed.
4) These injections used an elliptic filter with 150 dB attenuation.  This was the max attenuation that foton allowed me.  However, I still caused some massive upconversion in the CARM loop when injecting from 20 to 50 Hz.  Unclear why.

Next I would like to do a long-term injection at high frequency and make a spectrogram of the ordeal.  I tried making some spectrograms of these 200 second injections, but was unable to see much change in that time.

EDIT: Question (4)

Tonight during the PI measurements we switched on the ETM ring heaters commonly to 2.5W. This made our arm-prc mode matching worse shown by a drop in the PRG.

During this time the ITMY HWS measured a reasonable drop in lensing, whereas ITMX did not, which has introduced a differential lensing. I'm not sure why ITMY has been so sensitive to this change. Currently we are down to about 45 and the arm power/RF18/PRG has become choppy looking, previously during large TCS changes when this has happened the choppiness has got worse and we lose lock more readily. However it looks like it might be leveling off around 45 now. Previously when dropping CO2Y power compared to CO2X I also a RF18 increase.

h1omcpi and h1omc were changed and compiled but not installed (that's for Tuesday).

In h1omcpi, a decimation filter was put between the drumhead mode RMS (64kHz) and shared memory as the omc model works at 16kHz.

Alignment dither oscillators are common for deacon and normal dither. An input matrix is used for selecting the source of demod. This makes it cumbersome to switch between low frequency dither for deacon and high frequency dither for normal dither, but once deacon works it won't be an issue.

WP7995