Sheila, Kiwamu,

Tonight, we continued working on searching for the missing recycling gain. We opened up PRC1 (which uses POP_A_QPD and feeds it back to PRM) and moved PRM manually to study the effect of the spot position on PR2. This seems to work well and we were able to get back to a high recycling gain of about 34 when PSL was 25 W. The attached shows the time series of us moving PRM in pitch toward the negative side by about 90 urad. The first drop in the power recycling gain is caused by the power-up from 2 to 25 W. We had to move SRM by hand in order not to loose too much sideband build up in SRC. Our alignment action seems to pull the common soft (or something similar) to one direction in which all the test masses goes to negative pitch values (see the second attached). Therefore, as we were in O1, at this power level, the recycling gain can be still found under some alignment land. We did not try this test at a higher PSL power.

Also, we have noticed at some point that some segments of the POP QPDs already used up the half of the ADC range at 25 W. So we decreased the whitening gains to 0 dB (which were 6 dB before). Sheila changed the guardian accordingly so that it maintains the 0 dB gain as a nominal setting. Also when we had a good recycling gain with this alignment, the beams on both POP QPDs were almost falling off of the photodiodes

Weigang Liu tried folding DARM and selected magnetometer channels during the three days of ER9 (UTC days)
with results posted here:  https://ldas-jobs.ligo.caltech.edu/~weigang.liu/advancedLIGO_3/ER9/files/ER9_magnetometers_and_strain_list.html,
where DARM folding focused on the 10-50 Hz band, and the magnetometer folding was low-pass
below 50 Hz, choices motivated by O1 experience.

As expected, the magnetometer channels still exhibit a variety of pathologies with 2-second periodicity,
but the elevated low-frequency noise in DARM make it hard to see this 2-second contamination in that channel
with this method. Attached are a few sample magnetometer fold summaries over the three days.

Quick Summary: We stay at relatively low power because ITM PI damping modules are not ready.

(All time in UTC)

23:45 SUSPI model restart

00:45 DAQ restart

1:47 Kiwamu to the floor aligning REFL camera

2:35 Kiwamu out

2:45 Kiwamu request for higher power. Going to 30W.

Today turned into an impromptu maintenance day

DAQ

Maddie, Jim, Dave:

h1fw0 work, please see previous alog. DAQ broadcaster reconfigured to add  H1:SUS-ETMY_LKIN_P_LO_DQ channel to DMT for Maddie. DAQ restarted to support all of today's model changes

OMCPI Beacon Alignmnet [WP5991]

Shiela:

h1omcpi mode changed, required DAQ restart (slow chans change only).

SUS-PI DAMP quad PD data transfer to ITM-PI [WP5997]

Matt, Carl, Ross, Dave:

A new RFM channel was created on each arm to transfer the mux'ed ETM QUAD-PD I&Q phase to the corner station. The 8 channels are sent from the SUSETM-PI model via Dolphin to the PEM model. This model muxes the 8 channels to one new RFM, which is sent to the corner. The h1omc model receives the RFM channel, demuxes it to 8 channels and sends these (via Dolphin) to the h1susitmpi model. The h1susitmpi model receives 16 new channels, 8 per arm.

The following models were restarted: h1susetmxpi, h1pemex, h1susetmypi, h1pemey, h1omc, h1susitmpi. The DAQ was restarted.

h1susetm[x,y]pi has some fast channel renames:

+: fast channel H1:SUS-ETMX_PI_DOWNCONV1_DEMOD_I_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV1_DEMOD_Q_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV2_DEMOD_I_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV2_DEMOD_Q_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV3_DEMOD_I_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV3_DEMOD_Q_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV4_DEMOD_I_OUT_DQ added to the DAQ
+: fast channel H1:SUS-ETMX_PI_DOWNCONV4_DEMOD_Q_OUT_DQ added to the DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV1_DEMOD_I_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV1_DEMOD_Q_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV2_DEMOD_I_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV2_DEMOD_Q_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV3_DEMOD_I_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV3_DEMOD_Q_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV4_DEMOD_I_OUT_DQ removed from DAQ
-: fast channel H1:SUS-ETMX_PI_DOWNCONV_DOWNCONV4_DEMOD_Q_OUT_DQ removed from DAQ
 

which may cause some issues replaying old data.

After the addition of the RFM channel, so far we have not seen any IPC errors.

PEM changes [WP5998]

Robert, Dave:

PEMCS was changed to read three unused ADC channels into the model. Due to broken ADC channels, on the fifth ADC the last two channels (30 and 31) were upgraded to 16kHz and added to the science frame. The broken channels were removed from the frame, resulting in a nett reduction of science data.

At EX and EY additional ADC channels were ingested into pem (was ADC0 chans 8-13, now chans 8-23). At EY, four of these new channels were added to the DAQ science frame at 2kHz.

Jim, Dave:

Overnight h1fw0 has been stable while writing only science frames. Today we reconfigured it to also write second and minute trend frame files (so it is only not writing commissioning frames). It crashed on the next 10 minute point. We replaced the fiber optics cable connecting h1fw0 with the Fujitsu switch, it still crashed. Finally we power cycled h1ldasgw0 (solaris machine) and it fw0 has been stable since 12:20 PDT.

Title:  07/14/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
State of H1: IFO unlocked. Relocking not successful. Need to do initial alignment.   
Commissioning: 
Outgoing Operator:  None
 
Activity Log: All Times in UTC (PT)

15:00 (08:00) Start of shift
15:23 (08:23) Bubba – Driving in desert between the arms "to look at stuff"
15:51 (08:51) Bubba – Back from drive in desert
16:00 (09:00) Robert – End-Y electronics bay
16:05 (09:05) Kyle – Going to Mid-Y and Mid-X for vacuum work
16:40 (09:40) PSL tripped – Called Peter
17:10 (10:10) Peter & Ed – In PSL to diagnose oscillator & check alignment (WP #5996)
18:06 (11:06) Dave – Restart FR0
18:07 (11:07) Dan – Going into the CER to make PEM measurements
18:30 (11:30) Filiberto & Dan – Going into the CER
19:15 (12:15) Robert & Filiberto – Out of the CER
20:00 (13:00) Robert – Going to End-Y
20:15 (13:15) Robert – Out of End-Y 
21:43 (13:43) Robert – Going to End-Y
23:00 (16:00) Turn over to Nutsinee 

End of Shift Summary:

Title: 07/14/2016, Day Shift 15:00 – 23:00 (08:00 – 16:00) All times in UTC (PT)
Support: Peter, Sheila, Ed,   
Incoming Operator: Nutsinee 

Shift Detail Summary: Started locking. Problem getting past DRMI_1F. Run initial alignment. 
Having trouble getting through initial alignment SRC_ALIGN step.
Restart initial alignment. While doing the INPUT_ALIGN step, laser tripped off. 
Peter reset the laser, checked and adjusted PMC alignment.
Now during INPUT_ALIGN stops at LOCKING_XARM_IR. While here, the ICM will break lock and the Guardian restarts the INPUT_ALIGN. Sheila fixed the INPUT_ALIGN problem. Completed INPUT_ALIGN of the initial alignment.  
Commissioners working on the locking sequence. 
    
 

As the pre-modecleaner warms up, the output beam pointing changes slightly as seen in the attached plots.
Most of the alignment drift is in the vertical direction.

    Oddly enough most of the alignment tweaks for the pre-modecleaner take place in the horizontal plane.

The shot noise level from last night seems higher (worse) than the O1 level by 6%. Here is the spectrum:

You can see that the red trace (which is the one from the last night) is slightly higher than the (post-) O1 spectrum. The 6% increment was estimated by dividing the two spectra for frequencies above 1200 Hz and taking a median of it.

Attached is the plot of the high power oscillator PZT voltage.  The last voltage step coincides
with when the input modecleaner and reference cavity lost lock.  The first step in voltage coincides
with my deliberate adjustment of the slow voltage to lock the reference cavity to a different fringe.

    All this was to find a place where the FSS would be relatively okay with the input modecleaner
losing and acquiring lock.  Apart from one or two FSS oscillations when the input modecleaner lost
lock, all the PSL servos appear okay.

Changed the visibility logic for the FRONTEND and HPO maintenance fields.

    The front end visibility calc was formerly "A<34.9".  This was changed to "A<34".
Nominally the front end laser power is 35 W.

    The green HPO maintenance field visiblity calc was formerly "A+B+C+D>396".  This was
changed to "A+B+C+D>360".  This means that instead of requiring maintenance for a 1% drop
in power from each pump diode, maintenance is now flagged when there is 10% drop for each
diode.

    The remaining "warning" is related to the Visual Basic program on the Beckhoff PC
not running.  This is only required when the spectra of the pump diodes needs to be
recorded.

*track AAA: PSL
- fix FSS re-locking problem

*track A: missing RG gain:
- PR2 spot position during alignment
- Add digital camera of BS
- arm optics camera defocus & power monitor
- *** fix the 2x omega diodes for SB recycling gain readout
   - check broadband mod of 2w PDs (POB and AS)
   - new lens in front of POB_B

*track B: noise commissioning?
 - shot noise scaling?
  - check calibration
  - try for 50W stable. Serious trouble with PI?
  - pick operating point, then now-noise commissioning
  - reduce RF45
  - Aux length show exess noise - fix it!

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

The laser tripped this morning.  The status screen red flagged the following:
 - Xtak chiller flow
 - Interlock OK
 - Frontend Power error (WD)
 - Oscillator Power error (WD)

    Initial thought was that a water leak occurred.  That was not the case.

    Suspect that the power watchdog was tripped because the injection locking was lost.
When the injection locking servo loses lock, the laser power drops and sets off the
watchdog.

    The laser restarted without any problems, other than the alignment into the pre-modecleaner
was off a little.  Upon recovery, the pre-modecleaner had some problems locking.  Went into the
PSL Enclosure to adjust the alignment but by the time we got inside, the pre-modecleaner was locked.
Tweaked the alignment a little.

    Closed the other loops successfully.  After deliberately bringing up and down the input
modecleaner a couple of times, the FSS seemed fine with the occasional PZT oscillation.




  JeffB/Ed/Peter

Sheila, Matt, Kiwamu, Carl, Stefan

Earlier today we tried heating TCS CO2 X-arm with 2Watt (0 Watt into Y), and all we saw was a futher drop in recycling gain.

Tonight (07:29 UTC) we tried the opposite TCS: TCS CO2 Y-arm with 1Watt (0 Watt into X). (Half of what we put into x, because we broke lock on the first try.)

Result: Absolutely nothing - all recycling gains remained the same or further dropped.

Conclusion: TCS CO2 cannot get any recycling gain back.

============================================

Log:

UTC 20160713 23:08:09  all TCS CO2 completely off
 no effect on any sidebands
UTC 20160713 23:16:22  TCS CO2 X to 1 W 
UTC 20160713 23:21:21  TCS CO2 X to 2 W
  recycling gains drop, lock loss
UTC 20160714 07:29:00  TCS CO2 X to 2 W, TCS CO2 Y to 0 W
 recycling gains drop, lock loss

Nutsinee, Sheila

There is something wrong with the REFL and POP cameras, we see no image from them although we shoudl be seeing something on REFL. 

1440 -1510 hrs. local -> To and from Y-mid 

Opened exhaust check valve bypass valve, opened LLCV bypass valve 1/2 turn -> LN2 @ exhaust in 60 seconds -> Restored valves to as found configuration. 

Next CP3 overfill to be Friday, July 15th. 


Also, demonstrated MTP Safety Valve functionality when backed by local scroll pump (rediscovered that the "NORMOAL" light LED on the turbo controller is burned out) -> Let MTP brake phase complete but am leaving turbo rotor levitated, i.e. controller energized, overnight -> will de-energize tomorrow. 

Nutsinee, Kiwamu,

WP5990

We have (re-) set up the polarization monitors on the HWS table by HAM4. We have confirmed that they are functional. For those who are interested in the polarization data, here are the channels to look at:

• H1:TCS-IFO_POLZ_S_HWS_OUT
• H1:TCS-IFO_POLZ_P_HWS_OUT

In theory, they should be in unit of watts as measured at the HWS table.

[Installation notes]

This time, we have newly installed a short pass optic (DMSP950L from Thorlabs) to pick off the main interferometer beam without getting too much contamination from either the SLED light (790 nm) or the ALS beam (532 nm). The short pass mirror was inserted between the bottom periscope mirror and the first iris (D1400252-v1). Looking at the green light at the table from the end stations, we learned that the beam size is already pretty small and (visually) small enough for the beams to fit into the PDA50Bs without a lens. So we decided to go without lenses as opposed to the previous setup (24046).

The short pass mirror reflects the interferometer beam toward the left on D1400252. We placed a PBS (CM1-PBS25-1064-HP) on the left side of the short pass and placed the PDA50Bs. The power reflectivity of the newly installedshort pass mirror was measured to be 5% +/-3% for 532 nm. The absolute power (assuming the Nova hand held power meter is accurate) of the reflected green light was measured to be 1 uW.

One thing we leaned today was that the green light is not so trustable to get the optimum alignment. We first aligned the optics with the green light and then noticed that the infrared beams were almost falling off of the PDA80Bs. So we then closed the shutters and aligned them with the actual infrared beam.

The manual gain settings are:

• S_POL: 70 dB
• P_POL: 50 dB

The digital gains were also changed accordingly so that the calibration of these channels should be accurate.

The CW injection amptlitude, as measured at the HARDWARE_OUT, appears to have changed on restart May 12. So far, I have not been able to trace down the problem, and conlog is currently down so I cannot see a history of chagnes in the HARDWARE_OUT bank.

Figure 1 observations (10 minute trend of HARDWARE_OUT):

• Near the end of O1, the peak CW injection amplitude is ~1700
• On restart, May 12, the peak CW injection amplitude is ~780
• On May 26, when Keith Riles and I changed the CW injections to use the first attempt at a new actuation function, the amplitude of the injections drops to ~650 because the new actuation function is different than the old inverse actuation function (this might change if Keith restarts the CW injections with the revised filter, see LHO aLOG 27539)

Figure 2 observations (10 minute trend of CW_OUT):

• On restart, May 12, the peak CW injections is the same as at the end of O1, ~7.5e-23
• After changing to the actuation function method, the amplitude changes to ~650 (off scale on figure 2)

Need conlog to investigate further.