Writing this alog on behalf of most of the control room...

After we redid the input matrix for CHARD and INP1 10W, we checked the PRC2 and INP1 bandwidth. We were also concerned about the overall gain of CHARD P and Y since they seemed to be way too low

• We stepped the offset of INP1 pitch and yaw as a rough bandwith measurement. We found that INP1 yaw gain to be too high by a factor of 10, and the INP1 P gain to be just fine.
• we ran OLGs of PRC2 pitch and yaw, and found the gain to be about a factor of 3 too high for both, which may have been responsible for some 0.8 Hz buzzing we saw in the ASC signals whenever we tried to raise the CHARD gains
• After this, we were able to raise the CHARD P gain to achieve a UGF around 3 Hz, as desired.
• We were still unable to raise the CHARD Y gain to a reasonable value without ringups
  • it seemed anywhere between 20 and 40 dB too low, but it was hard to tell from the measurements.

We decided to power up anyway, and saw that the pitch ADS was able to run fine, now that the CHARD pitch gain was nominal. However, yaw ADS still had problems during move spots.

• We stepped up power from 10 W by hand, and then ran through the power 25W state by hand (which also changes loop gains, engages soft yaw, etc).
• Then we ran move spots successfully- towards the end of the state is where we had to drop the yaw ADS gains due to an instability.

Everything looked good, so I took us up in power from 25W to 60W, stopping frequently to check for instabilities. We made it, but again the ADS was unstable, so Georgia used the Camera servo guardian to move off the ADS to camera servos, and everything was fine.

I stepped through lownoise ASC by hand, skipping the lownoise steps of CHARD P and Y since those gains were not nominal.

• Then, I rescaled the overall lownoise gain of CHARD P and engaged its lownoise filters, no problem.
• I measured the CHARD Y OLG and found the gain  still very low. But this time I could step it up from 3 to 300 as needed and the higher gain made the buildups look a little better.
• Since the gain was back to nominal, I scaled to the lownoise gain and engaged the lownoise filters.
• The gain scaling is saved in the guardian.

Lots of the of the usual wobbly stuff in the ASC and buildups at high power, but the overall alignment and control looks good: PRG is still around 50 at full power.

We then ran through lownoise coil drivers and the ETMX ESD transition. We had one guardian error at the end of TRANSITION FROM ETMX due to divide by zero error since the convergence checker looks for something that is like [ADS error signal / ADS CLKGAIN] and the ADS CLKGAINs were zero. Georgia and I fooled the guardian by setting the CLKGAINs to 1 momentarily, and then undoing them once the state completed.

We ran all the way through LOWNOISE LENGTH CONTROL, although the LSC feedforward is no longer well-tuned, so I turned it off momentarily so we could check OLGs.

The LSC feedforward is currently so bad that we should go from-scratch when we retune it instead of the iterative method.

We had a fast unknown lockloss while sitting in this state- no one was doing anything and we don't see an obvious cause.

We think we have properly SDFed and guardianized all changes from today.

My only worry: we were not able to raise the CHARD Y gain until we reached maximum power, but obviously we are having ADS stability issues since this gain is too low. Currently I have set the guardian to have what I think is the "correct" CHARD Y gain (300 once all loops are closed), but if it's too high, drop it back to 3.

Recommended to do list:

• check PRCL OLG
• Check PRCL/SRCL/MICH sensing at high power
• consider turning off some LSC notches, many seem unnecessary
• Run MICH/SRCL (PRCL?) LSC feedforward measurements, tune, etc
• determine if we want to run camera servos sooner during power up/locking process
• Check SRCL offset

M. Todd, E. Capote, C. Cahillane

We ran an OLG measurement for LSC-MICH1 loop, once we were in LOWNOISE_LENGTH_CONTROL.

At first we saw that the guardian had not turned off some strange notch filters we did not expect to see.

Craig spotted these as BounceRoll filters, which we turned off and reran the measurement.

Soon after the measurement was done, we lost lock so we are wondering if these notches were responsible or if we need to watch out in other LSC loops.

Now that we're at 60 W of input power, I double checked the ISS secondloop array pointing after the vent.
We're missing slightly, seemingly pitched off the ISS QPD.

The ndscope has Y1 dashed white lines at where the ISS PD values are now.
The ISS secondloop PD values from March 12 are the actual traces.

We're still locking, and so I leave ISS picoing undone for now.  
We'll have to leave the ISS secondloop open and pico back onto the array at some point. 

Based on the attached PSD, this could be responsible for our huge peak at 29 Hz in DARM. 

TITLE: 06/02 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

Much of today was work in ASC land with H1 locked most of the day at 10W (but started powering up at the end of the shift) and also had the arrival of even more members of the Syracuse LSC Team!  But there was also work on the Squeezer toward the end of the day.  The plan for tomorrow's Maintenance Day is to continue with Vent Recovery locking work.

Rahul addressed rung up violin modes from this morning and he requested the Oli (EVE operator) to apply these settings new settings (noted in alog 84720).

The day started out with the drama of a fire out beyond End-Y (Fire Dept phoned the Control Room notifying us that they were fighting a fire on SR240 (see attached photo from the roof of the Corner Station).
LOG:

• 1441-1510 Manual Initial Alignment (w/ only PRX Touch up)
  • ALS_YARM had 1 STALLED episode---->Due to MANUAL ALIGNMENT!!
  • ALIGN_IFO had 2-3 STALLED episodes while I was trying to get to "PRX_LOCKED" (but this was during DOWN and the IMC was not locking)---->Due to MANUAL ALIGNMENT!!
  • SRC ALIGN OFFLOADED ran fine and no SR2 tweaks needed!
• 1455-1512 Optics Lab clean (kim)
• 1456-1701 Forklifting and unloading of trailer outside of Hi-Bay--if too loud, send a text! (randy)
  • Could certainly see him start this work on SEI's ITMY 10-30 BLRMS (loudest on Z) on nuc28 and also on the 3-30Hz seismometer plots
• 1510 Locking: 
  • LOCK #1:  DRMI locked up in 10min;  LOCKLOSS at PREP ASC
  • LOCK #2:  Held at OFFLOAD DRMI ASC (while checking on fire and due to lockloss above, had PR GAIN glitches---I believe Sheila said it was SRC mode hops...tried touching up PRM/SRM to improve POP18, but then there was a lockloss).
  • LOCK #3:  This is when lots of commissioners started arriving.  Eventually made it to CHECK VIOLINS (and Rahul started damping because they were off the screen on nuc30!)
• 1520 Kim notified us of Fire on SR0-240 (beyond EY, see attached photo); ~2 acres on Mile Post 16 of 240
  • 1529 Fire Dept phoned Control Room with status call:  mentioned about 2acres had burned, was around Mile Post 16 of SR-240 and it was only at the fence line of the road (would notify us if it jumped the fence (it did not).
  • 1552 Smoke no longer noticeable via Corner Station roof cam
• 1530-1705 Violin Damping by Rahul (1705 Gave the go-ahead to Power Up)
• 1555-1622 Checking arms for tumbleweeds (chris.eric)
• 1600-1631 MX cleaning (kim)
• 1605-2211 Running pipe for Air Dryer for the Air Compressor under the mezzanine in the Mechanical Room (ken)
• 1830 Tuesday Coordination Mtg
• 1948-2018 Snorkel lift move from EX to MX (randy, eric)
• 1954 Replace GC Switch (nyath, jonathan)
• 2000-2025 TCS Chiller check/fill/FAMIS (corey)
• 2038-2255 fiber collimator laser work in optics lab (jeff)
• 2130 Tour for Wenatchee Valley College (maggie)
•  

Control Room (Corey, Sheila, Elenna, Oli, Georgia, Craig, Julia, Matt, Keita, Ryan S, Camilla

Notes of what's been done so far today, we've spent the majority of the day locked at POWER_10W, adjusting the ASC sensing matrix and gains:

• After Initial Alignment, DRMI tends to lock on it's own after ~2minutes.
• Take ISC_LOCK in DRMI_LOCKED_CHECK_ASC and touch up SRM and PRM to increase RF18 (and decrease RF90.
  • ndscopes needed: LSC > LOCKING > ! Locking scopes > "Scopes: Buildups (slow)"
• [optional, only do if needed] Can pause at CARM_5_PICOMETERS if loosing lok at PREP_ASC_FOR_FULL_IFO and  then touch up SRM and PRM to increase RF18 (and decrease RF90).
• Then can go all the way to PREP_ASC_FOR_FULL_IFO. Stop here and move any ASC signals that are not on zero to zero. Maybe to move optics or use the usesrapps/../asc/h1/scripts/move_arm_dev.py script e.g. 'python3 move_ARM_dev.py CH P 0.01' for CHARD P. At the same time, watch that the RF90 stays low and RF18 and circulating power stays high. 
  • ndscopes needed: LSC > LOCKING > ! Locking scopes > "Scopes: Buildups (slow)" and "Scopes: ASC signals"
  • If error signals are saturated, turn off the soft limiters via the ASC screen e.g. H1:ASC-INP1_P_SMOOTH_ENABLE.
  • For this lock, we:
    • Touched SRM to improve SRC2
    • Turned off limiters IMP1 PIT YAW and touched IM4 to improve IMP1.
    • Touched PRM to improve PRC2
    • Used move arm dev script for CHARD e.g. python3 move_ARM_dev.py CH P 0.01 (zoom in to check if they are away from zero)
• Take ISC_LOCK in CHECK_VIOLINS_BEFORE_POWERUP
  • Today we needed to wait here while Rahul damped IY mode 6 84720
  • Elenna noticed that the gain in CHARD was ~ 30dB less than she remembered.
• Went to POWER_10W
  • Checked HWS data here
  • Elenna ran dither sensing matrix checks to make the phaser plots and designed ASC input sensing matrix for INP and CHARD 84726:
    • CHARD P: -1 A_RF45 + 0.6 B_RF45
    • CHARD Y: -1 A_RF45 + 0.8 B_RF45
    • INP1 P: 1.5 A_RF45 + 1 B_RF45
    • INP1 Y: 2 A_RF45 + 1  B_RF45
    • Sheila put these in the guardian
  • Georgia and Julia added offsets into the ASC loops to check the sensing of them 84724.
  • Sheila checked Elenna's suggested matrix made sense with Georgia's phase change measurements.
  • During this time at 10W, the circulating power / LSC-REFL_A started oscillating at 0.02Hz, Craig remembered they found this yesterday (84702) was due to the ADS PIT 4 and 5 loops. We turned these off and oscillation stopped, plot attached. We expect they are just over-compensating for the CHARD gain being too low.
  • Keita, Craig and I slowly turned on the matrix one at a time; INP1 Y, P, CHARD Y, P. By turning off gain, putting new matrix in, for INP1 we then brought error signal to zero by stepping IM4 and slowly brought the gains back to nominal.
  • Matt and Keita then ran CHARD_P_olg_shaped_exc.xml. When Elenna ran this while we were at 2W in, the gain was -30dB, now it's at -15dB.
  • Sheila, Julia and I turned H1:ASC-CHARD_P_GAIN up from 20 to 80 (+12dB) while watching the ASC output and input signals stayed fine, and then Elenna and Keita reran the CHARD_P_olg, found it was close to 0dB, leaving gain here.
  • Elenna and Keita ran CHARD_Y_olg_shaped_exc.xml, it started at -20dB, they raised the H1:ASC-CHARD_Y_GAIN up from 3 to 10, 30, and 300 we started seeing that CHARDY and/or INP1Y were now unstable buzzing around 0.8Hz, took back to 3. Even with gain of 10 the buzzing came back.
  • We turned ADS PIT 4 and 5 loops back on, hoping that with the CHARD P gain increase it would be fine now. 

TITLE: 06/02 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 11mph Gusts, 5mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.31 μm/s
QUICK SUMMARY:

We are sitting in POWER_10W, and have been here for the past several hours. Currently commissioners are still working on the CHARD, INP1, and PRC2 loops, kind of having to swap between all three as they slowly get them better (84711, 84724).

Julia, Georgia, Sheila, Camilla, Elenna

This might be out of date already as some ASC input matrices have already been updated.

On Sunday we had some locklosses as we powered up from a 0.02Hz oscillation. One known issue is we have taken out some gain out of our CHARD loops. We wanted to check our sensing (input) matrices CHARD, INP1 (which both use the refl wfs) and PRC2 (which uses new in vac pop_x).

We sat at 10W, with the input matrix Sheila found last week:

While Elenna measured the phasing using an 8 Hz line, Julia and I added offsets into the loops and looked at the responses in the different sensors.

• When we stepped INP1_P, we saw a differential response in REFL_A and REFL_B RF45 (first screenshot)
• When we stepped INP1_Y, we saw a small common response in REFL_A and REFL_B RF45 (second screenshot), and maybe a small response in RF9 (which is what was in loop)
• When we stepped CHARD_P, we saw a differential response in REFL_A and REFL_B RF45, same as INP1_P (third screenshot) and a small response in REFL_A and REFL_B RF9 in the Q quadrature (sad)
• When we stepped CHARD_Y, we saw a small differential response in REFL_A and REFL_B RF45 and perhaps also in RF9 (fourth screenshot)
• When we stepped PRC2_P, we saw a differential response in REFL_A and REFL_B RF45, RF9, and a step in POP_X (a bit weak?) (fifth screenshot)
• When we stepped PRC2_Y, saw saw a strong response in REFL_A and REFL_B RF9, and POP_X (fifth screenshot)

Some of this is a bit different to what Sheila saw last week, but our ifo alignment has changed. We want to find intrixes that are sensitive to each DOF and ideally are insensitive to the other DOFs.

• It seems like RF9 is not a good sensor of INP1
• For some reason our steps showed a similar repsonse in A and B RF45 to INP1 and CHARD in P, which was the opposite of what Elenna saw in her radar plots?
• POP_X is good at only sensing PRC2, but PRC2 yaw shows up in other sensors...

While writing this another input matrix for INP and CHARD has been put in - https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=84711 - and seems to be working so stay tuned.

We plan to work on our gain heirarchy and hopefully power up further soon!

Addressed TCS Chillers (Mon [Jun2] 100-125am local) & CLOSED FAMIS #27816:

• TCSx Chiller:  Had level of 29.6 cm.  Added 300mL for 30.4cm.
• TCSy Chiller:  Had level of 9.6 cm.  Added 280mL for 10.3cm.  
• There was no water in the small cup under the slow leak.

This morning while Corey and the commissioning team were trying to lock and power up the interferometer, the violin modes were pretty rung up. For most of the modes, I was able to damp them down using nominal settings except three of them which are listed below along with the settings which seems to be working for now. 

• ITMx mode 3 - FM1+FM9+FM10 Gain = -20 (+60 deg phase)
• ETMY mode 1 - FM1+FM6+FM8+FM10 Gain= -0.1
• ITMY mode 05 and 06 - FM6+FM7+FM10 Gain = +0.01 (-30 deg phase)

FAMIS 31088

No major events of note. The slow changes in PMC TRANS and REFL power seem to follow AMP2 output power.

TJ, Camilla, Checking as Sheila was concerned about this as Georgia/Craig need to move the ITMX SPOT GAIN "CENTER" 84702.

Attached are the HWS Live plots comparing when we get to 10W and 120s later for ITMX and ITMY now. And also for ITMX and ITMY at our last 10W power up before the vent (note that then we don't pause at 10W and continue increasing power during the 120s). 

Can see no obvious new point absorbers, ITMY looks perfect and ITMX has the same point absorbers as before, it;s possible there's a new point absorber on the right of the optics (orange arrow in attached) but it doesn't look scary. We will continue to check this but it's possible that our alignment has just changed (has since 66198) so that we can now see this point.

HAM1 annulus system appears to have issues pumping down, currently its annulus ion pump is railed 10 mA, and the pump cart pumping on this system is sitting at 6.04x10^-05 Torr, see attached photo.

Process thus far:

• Last Thursday I managed to go and visit some of the -Y door bolts, found out that most of the bolts from 3 to 7 O'clock were not tigth, I was able to get 90 degrees turn, one bolt was actually loose, I was able to turn it by hand, but those were the only one that I was able to work on, since I was asked to stop work at HAM1.
• Another test done was to check for leaks on the aux cart pumping line, so the cart was isolated via the annulus system isolation valve, the pressure dropped at the aux cart down to 4x10^-06 Torr, meaning that no leak is on the pumping side, the isolation valve was opened again to continue pumping.

I plan to visit HAM1 to check the rest of the bolts on -Y door and +Y door.

M. Todd, C. Cahillane

Yesterday we were interested in some noise we were seeing around 6Hz in various ASC signals (mostly CHARD pitch). This motivated us to look at the RMs, so I took a PSD of each DOF for both RMs.  We are not sure why there are such differences in all the dofs, and if there are unintended side-effects to this.

I'm specifically wondering why RM2 has larger peaks around 6.25 Hz in all dofs...

For chamber closeout finalization, this morning I 

* placed a 3" contam control wafer on the center of the HAM1 table today
* took a few last pics, removed the stowed 3x septum covers (missed removing the 4th one from the septum, thanks vac good eye, pic 4)
* looked around for left behind tools
* retraced the beam path to look for errand in-the-way cables (none observed)
* inspected under and around lower area of table for left goods (none found)
* cleaned up last tool pans to get ready for doors
* particle counts were <50 all sizes, zero most often
* purposefully coiled the to-be-used in post O4 next vent cable with the peek connector not grounding to anything - it sits in the PSL side door well below the table

* all subsytems have signed for doors, so we are putting doors on.

Keita, Elenna, Oli, Rahul, Camilla

Summary: Majority of REFL path optics are aligned. Need to beam profile and finish LSC and ASC REFL diode placement on this path and place/check all beam dumps.

This morning, Keita opened the light pipe, locked the IMC  but couldn't see the beam as nicely as he did on AS_AIR yesterday. Since that time he had restored PR2 and PR3 to a time we were last locked. He reverted those changes as we could see the beam back at AS_AIR. Checked again IM4 trans QPD was the same as yesterday.

• The beam coming out of the spectrum port was not centered on the REFL optics that had been placed as per D1000313-v19. We checked Corey's photos to compare REFL optics position relative to periscope and the D10002313 drawing and convince ourselves the beam in correct just the drawing of it is incorrect.
• Firstly checked the incoming beam was centered on M14 and the reflected beam off this was dumped on the HiPWR beam dump which was moved to it's final position.
• Beam centered on HW1
• Beam centered on M17 and the reflected beam off this was dumped on the HiPWR beam dump
• Beam centered on M1 and headed towards M2
• Beam centered on M7, following the correct beam path off the table and dumped but a temporary dump (before we put in BDV1)
• Beam centered on M2 and headed towards center of RM1.
  • Transmitted M2 beam dumped by BD8
• Rahul got RM1 and RM2 damping loops working so they are now in DAMPED nominally (changed OPS whiteboard) Rahul set sliders to zero.
• Beam centered on RM1 and headed towards center of RM2 (we had to turn RM1 in YAW)
  • BD16 placed behind RM1 but beam can't be seen to align to.
• Placed M5 in roughly correct place
• Beam centered on RM2 and headed towards center of M5 (we had to turn RM2 in YAW)
• Beam centered on M5 and headed towards the SLED
  • There was a fair bit of iteration of M2 and M5 here to get the beam to be aligned and centered on all optics through the SLED, still needed to adjust SLED mirror to get it centered on the final mirror.
• Adjusted the SLED steering mirror (in the position +X -Y) on the SLED to center the beam on the ASC REFL B diode steering mirror.
• Adjusted ASC REFL B diode steering mirror so that picomotors had some range left.
• Beam centered on M6 and headed towards L1/M18
• Beam centered on L1
• Beam centered on M18 and headed towards LSC REFL A and LSC REFL B
  • We stopped here before fully aligning these too diodes
  • LSC REFL A is aligned by eye and 22cm from L1 (+222mm FL)
  • LSC REFL B is 20cm from L1 and will be moved to match LSC REFL A tomorrow.

Additionally M16 was placed roughly in the correct position, all optics are now on HAM1 (apart from PM1) and the class-B pans are empty and packed up.

Left IMC locked.