TITLE: 05/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

Straightforward shift with about half of it for Commissioning, Calibration measurement, and a relock.  The relock was mostly automated but ALSx did start with low power (0.45) again.
LOG:

• 1427 H1 locking & PRMI had just been locked
  • 1507 NLN
  • 1507 PI-31 ringing up for agbout 45 sec before being damped
  • 1509 OBSERVING
• 1445 Technical cleaning @Optics Lab (karen)
• 1511 Snorkel emergency:  HVAC issue at LExC which requires access to the roof and the snorkel lift is the only option for that.  It is at EY.  ON our Acceptable/Not Acceptable list I do not see mention of this special case, so I let them go. (We just got to Observing, L1 went down for commissioning a few minutes ago for commissioning.  
  • 1533-1544 Arrival at EY & drove snorkel to trailer.  1548 @MY.  1554 trailer drives by CP1 & LVEA (other cars in way at VPW).  1558 Trailer is away from Corner & at LExC.  H1 remained locked the whole time (perhaps a glitch which coincides with them at EY)
• 1530 Ops Note:  did not receive Calibration reminder for 830amLocal.
• 1543-1907 COMMISSIONING begins
  • 1618 commissioning lockloss
• 1619 nuc33's dtt crashed, so ran launch script
• 1618 Locking notes:  ALSx was really low at 0.45.  I tweaked to get flashes up to 0.8, but then INCREASE Flashes took over for 8min to do the same thing.
  • DRMI locked on 1st attempt
  • 1709 NLN
• 1803 SHG/Laser Hazard work in Optics Lab (Terry, Kar Meng)---out to lunch@1905
  • 2030 Heading back in
• 1815-1848 PCal Labwork (francisco)
• 1907 Back to OBSERVING
• 1956 EverBridge Quarterly Test sent out to LIGOWA group
• 2110-2137 Calibration measurement coordinated wtih L1 (& gave heads up to Virgo).
• 2137-2203 Squeezed in some extra commissioning time immediately after the calibration measurement.  (sheila)

TITLE: 05/15 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 156Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 17mph Gusts, 12mph 5min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.09 μm/s
QUICK SUMMARY: Locked for 6 hours, calm environment at the moment.

After coordinating with LLO & notifying Virgo, went with running the Wednesday Calibration Measurements (broadband [~5min] + simullines [~23min]) at ~ 21:10UTC. 

Logistical Notes In Intersite Coordinating:  At 2007utc (107pmPDT) contacted LLO Control Room via Teamspeak and JoeB/Anamaria wanted another hour so they could also have atleast 3hrs of thermalization.  So will connect with LLO at 2110utc to coordinate our down time for our Wednesday calibration measurement.  Then contacted the Virgo control room via teamspeak to give them a heads up for possible down time at 2110utc.

Measurement NOTES:

• Following instructions (link)
• H1 will be thermalized at around 2000 UTC, but will wait for L1 to thermalilze & start at 2110utc.
• 21:10:06 ISC LOCK to NLN_CAL_MEAS
  • Calibration_Monitor medm screenshot is attached
• 2110 - 2106 Broadband measurement run
  • Measurement at:  /ligo/groups/cal/H1/measurements/PCALY2DARM_BB/
• 2114 - 2137 Simullines measurement
  • gps START time:  GPS:  1399842963.971634
  • gps END time:  GPS:  1399844255.440947
  • Files writtten to subfolders here:  /ligo/groups/cal/H1/measurements
• Not sure how long it takes for the pydarm report to post from the H1 Calibration webpage, but will try attach a pdf of the pydarm report if it loads before my shift ends.

[Sheila, Jenne]

We did a first quick test of moving the spot on PR2 during our commssioning time this morning.  Our biggest conclusion is that 'wow, we need to move a lot if we're going to center on PR2'.  Since it was late in the commissioning window, and I had already broken lock once today when shaking HAM3 (alog 77851), we didn't shake HAM3 while doing these moves.  That's something that we'd like to do at some point, to hopefully see that the effect in DARM is lower when the spot on PR2 is closer to center.

Sheila manual-ed the ISC_LOCK guardian to the PR2_spot_move state.  This state watches how much PR3's slider moves, and moves the PRM and PR2 sliders to compensate that move.  In the first attachment of the slider values for the 3 PRC optics, you can see that PRM and PR2 sliders are following along when Sheila moves the PR3 slider.  We didn't see very much response in the ASC loops when we made a step, which means that these 'following along' scales for the PRM and PR2 sliders are still quite good, even though we haven't used this guardian state in several years.  First we went a small amount one way, then we went a larger amount the other direction in yaw.

The second attachment is the top mass OSEM witness of the moves, and the third attachment is our cabity buildups.  The x-axes of all these plots / screenshots are set to be the same. The bigger yaw movement (almost 3.6 urad in PR3 yaw) a little after -1h clearly shows a bump up in arm circulating power, that then goes away when PR3 is moved back to its nominal position. This bump is clear in the arm circulating powers, even though the IFO was still thermalizing.  Interestingly, I don't see a similar bump in POP_LF, the amount of power circulating in the PRC.

While PR3 was at it's extremal yaw position for today, I did a rough Y2L optimization for PR2 with step sizes of 0.05, and found that a Y2L value of -7.40 was about the best I could do to minimize the peak (30 Hz, 1 ct using the ADS oscillator) in PRCL_OUT.  After Sheila put PR3 back to its nominal position, I re-checked, and found a Y2L value of -7.50 was the best.  This means that we moved the spot on PR2 by about 0.2 mm (out of the 15 mm we think we need to move) closer to center, when we changed the PR3 yaw alignment by 3.5 urad. I'll note that I did not have the 30 Hz notches in the quads' ISCINF pit and yaw filter banks engaged, but I'm not fully sure that those are helpful here (if they are important, we should add them to all of the other optics, not just the quads).

Just as a double check of whether we really should need to move PR3 that far: If I assume the distance between PR2 and PR3 is 1/3 of the PRC length 55m, my lever arm for a very naiive spot movement calculation is about 18m.  At 18 meters away, a 3.5 urad angle change will move a beam 6.3e-5 m, or 0.06 mm.  So, this very naiive estimate gives a smaller beam spot motion on PR2 for a given PR3 move than we measure using A2L, but it confirms that indeed we probably didn't make a very dramatic move on PR2 today. 

H1 just completed a block of Commissioning time and is back to Observing.  H1 is currently about 2hrs into thermalizing, so may try to coordinate a Calibration break with LLO (& give a heads up to Virgo).

Wed May 15 10:14:42 2024 INFO: Fill completed in 14min 38secs

Gerardo confirmed a good fill curbside.

I was working on shaking the HAM3 ISI to see the effect of potential clipping on the PR2 scraper baffle (with the idea that we were then going to move the spot on PR2 and see how DARM changed), but I was saturating the H3 actuator and the ISI's watchdog timed out and tripped off. 

I had just increased the excitation by a factor of 2, to 10 counts going to H1:ISI-HAM3_ISO_Y_EXC, and that last factor of 2 is what started saturating the actuator.  Since we were able to see some subtle effects in DARM with 5 counts, we'll try using that when we next get locked.  We may be interested in a conversation with SEI folks about whether it is safe to override the actuator saturation watchdog during this type of test, in order to more clearly see the effect in DARM, but we'll save that for another day.

Sheila pointed out that it would be useful if verbal alarms would tell us when we are saturating a seismic actuator (similar to how it tells us if we are saturating a suspension).

Attached are screenshots of the amount of motion above ambient, as well as that this last factor of 2 increase in actuation is what caused the saturation monitor to start accumulating, as well as of the excitation settings.  This DTT template is a copy of what was in the Noise Budget git space for HAM5, with the exception that the noise budget excitation value is 0.6 counts, and I wasn't really seeing an effect in DARM until I got to 5 counts.

TITLE: 05/15 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 9mph Gusts, 6mph 5min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.10 μm/s
QUICK SUMMARY:

Walked in to h1 locking PRMI (there was a lockloss 25min earlier (at 1405utc).

I believe Commissioning is in the morning today (along with a calibration measurement), but H1 will be thermalizing the next few hours.

Green arm x power is looking back to normal-ish with power closer to 1.0.
(Also there was  box with a bat in it outside the entry to the Control Room.)

TITLE: 05/15 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: Ibrahim
SHIFT SUMMARY: One lock loss with an easy relock. On the first lock I had to step out of Observing to do a sqz scan, this helped our range. Currently locked for 2.5 hours.
LOG:

• 0151-0155 Dropped observing for Squeezer to relocking
• 0313-0321 Dropped observing to scan and adjust sqz angle
• 0419 Lock loss
• 0528 Observing

1399782005

Seemed very sudden, there was only a very minor wiggle in DARM msec before the lockloss.

RickS, FranciscoL

On Tuesday, May 14, we moved the pcal inner beam by 5 mm on the Rx sensor at X-End. This is the start of an investigation on potential sources of systematic variations to the pcal system.

Our procedure and notes are the following:

1. Connected voltmeter to 'Rx Mon PD' of pcal interface chassis (D1400153) front panel to monitor the signal from Rx when moving the beam.
   • Forgot to write down a value for Rx voltage, ndscope shows a value of 0.5165 W for 'H1:CAL-PCALX_RX_PD_WATTS_OUTMON' before making any changes (PCALX_RX_PD_WATTS_BEFORE).
2. Removed the Rx enclosure and closed shutter.
3. Placed and aligned target on integrating sphere input port (RxX_TargetAlignment). Opened shutter once the target was aligned.
   • Rx voltage of 2.87 V with both beams into the middle of the target.
   • Rx voltage of 1.49 V after blocking the outer beam.
4. Moved beam 5mm towards the right - facing the target (RxX_InnerBeamMoved), the left beam is the "centered", outer beam, the right beam is the "moved", inner beam.
   • This movement was done, instead of moving left, to avoid the out of vacuum coating edge. The equivalent of "moving to the right" at the target is adjusting counter clock-wise on yaw of the mirror mount. There was some adjustment to the pitch as well.
   • Rx voltage reached a peak at 1.447 V
5. Removed beam block to have both beams. Rx voltage of 2.844 V
6. Removed target.
   • Rx voltage was of 3.383 V
   • Ndscope shows a value of 0.5164 W after making changes (PCALX_RX_PD_WATTS_AFTER)

We expect this procedure to reflect the calculations done in T2400032 which depend on the position of the IFO beam and the pcal beams on the ETM. With this movement, and following the parameters from the technical note, we are expecting to see a change in the XY ratio of +19 HOPs (after - before). This procedure will be iterating in the following weeks, making a series of movements of the inner beam, with reports on the value obtained after making a beam movement.

0313-0321 UTC

Our range was around 135Mpc after the squeezer relocked itself at 0151UTC, and the SQZ FOM didn't look great. I stepped out of Observing to run SCAN_ALIGNMENT_FDS  and  SCAN_SQZANG before returning to Observing. We are currently at ~151Mpc, so it seemed well worth the 8 minutes.

FAMIS28353

ITMs look consistent in April, but ETMY looks to have changed since the April 30th measurement. I'd guess that this is due to Robert and Anamaria's changes to the ESD bias on May 5&7th (alog77633).

TITLE: 05/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Calibration
INCOMING OPERATOR: TJ
SHIFT SUMMARY:

A light Mainteance day made for a nice & fairly quick return to observing (but our low range of 150Mpc continues---Sheila has a new tool to check on low range in this wiki LINK).

X-arm for ALS had low powers (0.65) after an alignment (which is low), but we made all the way back to NLN.  (this was observed last night by Oli & Ibrahim, btw)

LOG:

• 1443-1955 cable tray install in lvea/filter cavity for VAC ion pumps (ken)
• 1445-1514 EY receiving snorkel lift (chris, eric, tyler)
• 1458 LOCKLOSS
• 1459 MAINTENANCE
• 1501-1633 3IFO iss checks (betsy, mitch)
• 1504-1550 Technical cleaning at EX (kim)
  • 1505-1550 FCES cleaning (karen)
  • 1550-1625 EY (karen)
  • 1551-1704 EX (kim)
  • 1715-1855 LVEA (karen,kim)
• 1509-1725 turbo pump tests at MY+EY (jordan)
• 1515-1808 VPW Heat pump swap/grabbing toyota forklift (chris, eric)
• 1516-1536 SR3 oplev (jason)
• 1519-1605 Pcal lab (francisco)
• 1524-1533 checking cable trays (gerardo)
• 1533-1650 FC cable tray checks (gerardo)
• 1549-1838 FARO + crane (jason, tyler, ryanC)
• 1559-1747 UPS checks on site (fil)
• 1600-1834 etmY+X Charge measurements (rahul)
• 1601-1622 HAM6 viewport checks (jordan, janos)
• 1605-1718 PCal At EX (rick, francisco)
• 1609-1805 SHG in optics lab (terry)
  • 1634 Kar Meng joining
• 1611-1746 CP2 ln2
• 1625-1738 FC cable checks (janos)
• 1616-1636 lvea checks (richard)
• 1635-1653 power supply checks (marc)
• 1636-1752 single-bounce SR2 (sheila.jenne)
• 1738-1827 More ion pump cable checks (janos)
• 1754-1822 HAM3 shaking (jenne)
• 1757 ey checks (mitch, betsy)
• 1814-1827 lvea photos (mike)
• 1840-1910 LVEA sweep (corey)
• 1843-1927 Initial Alignment started by Jenne
  • Sheila mentioned Jenne had to assist X-arm due to being in Increase Flashes for a while.
  • X-arm power started at 0.73 and ended up at 0.65 after alignment.  (Y-arm was at 0.91.)
• 1959 PCal Lab work (Francisco)
  • 2057-2222 More PCal Lab work
• 2011 Back To OBSERVING
• 2040-2050 TCS chiller top-off (corey)
• 2055 SHG work (terry.kar meng)
• 2108-2125 Pitchforking tumbleweeds out of "The Valley" in between FC & Y-arm (tyler)

After Maintenance Day today, I did my first LVEA Sweep of O4 (at about 1140PDT).  There were a few items which came up as I swept:

"Confirm no mechanical shorts onto HEPI."

• Noticed a few shorts as I walked the around various chambers.  
• Main culprit was a cable or bundle of cables contacting the Crossbeams (the big blue metal boxbeams on top of the HEPI stations and which are connected to the Support Tubes that go into the chamber).  Noticed this mainly for HAM1/2/3 (some were obvious, others looked like shorts, but still had a tiny air gap), but there was a single cable on HAM6 which contacts the east crossbeam.  
  • See examples of these "shorts" in photos 1-7.
• HAM5/6 had some much better handling of bundles of cables which were intentionally suspended up and away from the Crossbeams.
  • See photo #8.

"Cranes in their "parking spots"

• Noticed some cranes a couple feet off from the "parking spots" signs, but maybe it's close enough?

"Unplug unused power supplies/extension cords"

• Found one for the FARO near the Roll-Up doors;  I thought they might have forgotten this, but he said they did this when the FARO was near the Y-Beam manifold and asked me to keep it plugged in.

At any rate, these were items noticed during my LVEA sweep.  I did not change ANYTHING (above) mainly because I had not done a sweep in ages, and perhaps these are things we are "OK" with.  At any rate, just wanted to share observations from an old operator.  :)

TITLE: 05/14 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Ibrahim
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 10mph Gusts, 6mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.11 μm/s
QUICK SUMMARY: Locked for 3 hours, low ALSX arm power for the last day has caused some locking issues. I'll be on the lookout for this.

Addressed TCS Chillers (Tues [May14] 1340-1350pm local) & CLOSED FAMIS #27789:

• TCSx Chiller:  Had level of 29.3 cm.  Added 245mL for 30.0cm.
• TCSy Chiller:  Had level of 10.7 cm.  Added 0mL.  
• There was no water in the small cup under the slow leak.