Sat DAY Ops Summary

TITLE: 03/01 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

It's a been a rough day on the locking front.

Microseism is high (the 2hrs when H1 was OBSERVING, you could definitely see alot of 0.12 - 0.15 Hz oscillations in many LSC, ASC, & SUS signals ndscopes).  

DRMI has not looked great (even after fresh alignments).  Not seeing many triggers for it and the flashes are as high as they have been.  Hoping this is also microseism-related.

Also had a return of the SRC noise during OFFLOAD DRMI ASC earlier in the day, but then it went away.
LOG:

• ISC LOCK stalled, ran INIT on H1 Manager to clear up
• 1547-1607 Initial Alignment
  • DRMI & PRMI looked bad; tried CHECK MICH FRINGES (if this looks bad will run another alignment).
  • C_Mich_Fringes did the trick with PRMI locking in seconds
  • 1652 (& lockloos) & 1732 Had return of SRC noise during Offload_DRMI_ASC
• 1815 OBSERVING
• 2000 Lockloss
  • 2003-2027 Initial Alignment
  • No SRC noise seen at OFFLOAD_DRMI_ASC
  • 2053 LOCKLOSS at ENGAGE ASC FOR FULL IFO :(
• 2155-2337 PCal sensor measurements in PCal lab (tony)
• 2227 OBSERVING
• 2248 Lockloss
  • 2250-2312 Alignment
  • DRMI looked bad (no triggers) even after recent alignment
  • PRMI looked bad (although it had lots of triggers), but could see a pitch misalignment, and eventually found that the BS was misaligned--so tweaked BS pitch in the positive direction a few clicks and this improved flashing and PRMI locking.
  • Kept having trouble with a misaligned DRMI.
  • 0009 2nd Alignment started

Mid-Shift Status: Rough Waters Continue

Managed to get 1.75hrs of OBSERVING this morning, but then had a lockloss.  Acquisition is no easy either. DRMI & PRMI have not looked great after Initial Alignments (like they usually had been).  BUT, there is high secondary AND primary microseism for H1.  Will keep battling.  Did not get to run the Saturday Calibration, because H1 was not thermalized this morning (in the last 13hrs we have not had a thermalized H1).

Have had some PRMI offloading which has taken as long as 4-5min (don't recall it taking that long...with that said, this current lock offloaded PRMI in under 2min).

H1 Status: Struggles Continue And SRC Noise During OFFLOAD_DRMI_ASC Returns

H1 struggled last night/this morning--H1 was down close to 6hrs (NOTE:  µseism is elevated). 

Since there hadn't been an alignment, thought this would do the trick since one hadn't been run a few hours into relocking.  Unfortunately, DRMI & PRMI didn't look great post-IA.  CHECK MICH FRINGES helped.  Then continued with locking with various locklosses.  During locking I happened to notice a RETURN of the SRC noise during OFFLOAD_DRMI_ASC (noted: alog83080, alog82997).  This is post-SRC2_Pitch gain reduction a couple days ago (alog83092, alog83078).

This noise issue definitely looks ugly and continues to exhibit SRM/SR2 Saturations heard via Verbal and for the one for this current lock it eventually calmed down on its own after a few minutes (this was around 1732utc).  While waiting for H1 to get to OBSERVING, looked to see if we if there were other instances of this noise returning (atleast for the last 1.5 days).  Here were the times when it occurred with the lower SRC2_P gain of 40 for ISC_LOCK state -111 (w/ notes for each one; also see attachments):

• 1732utc:  About 90-sec, LARGE noise, no action taken, and H1 survived and made it to NLN
• 1652utc:   About 40-sec, LARGE noise, caused a LOCKLOSS
• 902utc:  About 40-sec, small noise
• feb28 1413utc:  About 30-sec, very small, but observable
• feb28 725utc:  About 30-sec, very small, but observable

Perhaps it's getting worse?  Also only had the one lockloss from looking at these for the last 1.5 days.

Sat CP1 Fill

Sat Mar 01 10:12:29 2025 INFO: Fill completed in 12min 26secs

Delta time channels now continue post-fill showing the max-delta values attained, which for today is about 85C with the trip set to 50C. The Delta values are absolute, so the rise in TC temps appears as a second hump in the 30S lookback channels.

Sat DAY Ops Transition

TITLE: 03/01 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 5mph Gusts, 3mph 3min avg
    Primary useism: 0.11 μm/s
    Secondary useism: 0.81 μm/s
QUICK SUMMARY:

Walked in to see H1 down, after figuring out what was going on (ISC_LOCK was stalled due to H1 Manager), and seeing that H1 hasn't had an alignment for a few hours, started an alignment a few minuts ago (feels like H1 has been requiring an alignment after locklosses the last few weeks).  Alignment is almost done.

Primary microseism took a small quick stepup betwen 21-1utc, and secondary microseism returned to being above the 95th percentile since about 7utc.  Winds are calm.

Ops Owl Update

H1 is trying to lock but things seem shaky. The primary useism has grown quite a bit in the last 12 hours and the secondary is peaking above1um/s. We've had a few higher state lock losses, not in the same place, and we've made it to NLN recently, so I think I'll just let it keep trying for now.

Friday Eve Shift Report.

TITLE: 03/01 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 151Mpc
INCOMING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 9mph Gusts, 5mph 3min avg
    Primary useism: 0.12 μm/s
    Secondary useism: 0.52 μm/s
SHIFT SUMMARY:
H1 has been locked for 8 hours and 14 minutes and Observing all shift.  I expect the Owl shift should be peaceful.
Everything seems to be running smoothly.

LOG:
                                                                                                                                                                                                                                    

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
22:14	isc	keita.siva	optics.lab	-	iss pd array	01:03
22:24	ISC	Matt, Mayank	OpticsLab	n	ISS array	01:03

 

Fri Ops DAY Shift Summary

TITLE: 02/28 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 143Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

Decent shift with only one lockloss (whose recovery was straightforward but an initial alignment was needed due to usual ALSy shenanigans).  Also had a tour from a group from the VIT plant.
LOG:

• 1609 Contractor (MacDonald Miller) working near H2 Room and VPW for HVAC (tyler)
  • 2119 Let them back in through the gate
• 1617 Optics Lab cleaning (kim)
• 1627 Incoming EQ from Russia on verbal;  M5.2 and did not see any effects
• 1753 SEI_ENV returns to CALM (after being at USEISM for about the last 32hrs).
• 2026 VACSTAT alarm caught & cleared by dave
• 2029 Lockloss
  • 2039-2058 Initial Alignment
  • 2151 OBSERVING
• 2113 ISS Array cable inventory work (keita)
  • 2136-2143 Mock Feedthru to ISS team (rahul)
  • 2213 Siva joining
  • 2223 Matt, Myank, Kieta heading back in the optics lab.

Added critical camera marker on DIGIVIDEO Overview, expanded INFO to include switch port information

The digital camera MEDM main window now indicates which cameras are copied by the CDS_CA_COPY Guardian node and written to front end models. These are denoted by a blue tick at the left edge.

The camera.yaml file has been expanded to add how the camera is powered and which network-switch and switch-port the camera is connected to.

Friday Eve Shift Start

TITLE: 03/01 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Corey
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 7mph Gusts, 3mph 3min avg
    Primary useism: 0.08 μm/s
    Secondary useism: 0.37 μm/s
QUICK SUMMARY:

LHO H1 has been locked for 2.5 hours.
The IFO seems to be running smoothly, with decent range.
The plan is to continue to Observe for the rest of the Evening & night,

 

VACSTAT detected BSC3 sensor glitch, restarted VACSTAT to clear

At 12:17:36 PST we had a sensor glitch on the BSC3 gauge, causing a VACSTAT alarm. This was another of the periodic glitches, the pressure stepped up from 3.2e-08 to 4.9e-08 for 4 seconds and then immediately stepped back.

vacstat_ioc.service was restarted at 12:26.

End X chiller pump repair

I replaced the bad pump seal on the one of the chiller pumps at the End X chiller yard on 2/27. 

Fri CP1 Fill

Fri Feb 28 10:06:02 2025 INFO: Fill completed in 5min 59secs

New code did not post-fill the ROC channels, I tracked this to a "calculated ROCs but didn't write to PVs" bug. Will test again tomorrow.

PSL Status Report (FAMIS #26366)

This is for FAMIS #26366.

Laser Status:
    NPRO output power is 1.85W
    AMP1 output power is 70.39W
    AMP2 output power is 140.0W
    NPRO watchdog is GREEN
    AMP1 watchdog is GREEN
    AMP2 watchdog is GREEN
    PDWD watchdog is GREEN

PMC:
    It has been locked 23 days, 19 hr 46 minutes
    Reflected power = 22.42W
    Transmitted power = 106.6W
    PowerSum = 129.0W

FSS:
    It has been locked for 0 days 1 hr and 21 min
    TPD[V] = 0.8066V

ISS:
    The diffracted power is around 3.4%
    Last saturation event was 0 days 3 hours and 1 minutes ago

Possible Issues: None reported

Fri Ops Day Transition

TITLE: 02/28 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 144Mpc
OUTGOING OPERATOR: TJ
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 6mph Gusts, 4mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.47 μm/s
QUICK SUMMARY:

H1 just recovered from a lockloss and has been in OBSERVING 10min.  Secondary microseism continues to come down, the last 24hrs, from peaking above the 95th percentile & winds are calm.

At 1533utc there was a Verbal for Wifi on in the LVEA, but see that it has been OFF the last hour.

ALSO:  Continue to have a note about limiting activity in the Optics Lab near the Fume Hood which had a termite nest--this is a message from the exterminator.

OPS Thursday EVE shift summary

TITLE: 02/28 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 149Mpc
INCOMING OPERATOR: TJ
SHIFT SUMMARY: 1 lockloss with an automated recovery with an IA. We've been locked for 2.5 hours.
LOG: No log

The SQZ PMC PZT voltage is reporting as low and has been dropping over the past 8 hours

• 01:53 UTC lockloss there was an increase in ground motion in the 0.03 - 0.1 EY and CS axis at the time
• 02:33 Initial alignment
• 03:36 UTC Observing

 

01:53 UTC lockloss

01:53 UTC lockloss

HAM1 work on Friday (Ryan1, Craig, Georgia, Keita)

For mirror identification, see attached.

ASC-REFL_A replacement.

The new one is D1102004-V6 S/N 005 S1301248 (ICS ASSY-D1102002-001), the old one is S/N 012, S1301242.

With the old one, one of the differential output for DC4 segment failed and we've been using H1:ASC-REFL_A_DC_SEG4_GAIN=2 to compensate. With the new one, this didn't seem to be the case and we changed the digital gain to 1.

Daniel used the external RF injection ports to confirm that RF circuits are connected.

DC centering loops worked.

Beam dump relocation.

POP_air BDV reflection was hitting the corner of the V of the V-shaped beam dump.

ASC_REFL_A and ASC_REFL_B reflection were hitting the corner of the V of the V-shaped beam dump.

We moved these beam dumps so the beam hits one of the panels, not the corner.

We weren't able to see the LSC POP_A reflection. We might want to increase the power to 10W or so after everything is done so we can at least see the flashes.

We forgot to check the LSC REFL_A and REFL_B beam dumps.
Swapping the optic in M2.

This is one of the corner mirrors in the REFL in-vac path, and we swapped the HR with the 50:50. We made sure that the wedge orientation is correct (thinner edge is close to [+X, +Y]) For the 50:50 using the laser pointer. Since HR doesn't have any wedge, we had to manually adjust M2 to restore the REFL path.

The AOI of that optic is not accurately known but I eyeballed it to be 50 degrees, and based on that I measured the reflectivity of the 50:50 in the lab before installation (alog 63404). It was about 43% reflection at 50degrees, 35.6% at 55 degrees.

In situ, we got 41.1%, so AOI is probably a bit larger than 50 degrees.

We put a beam dump to catch the ghost beam of the new optic.

Power measurements, continued.

We're done. If we can carrier-lock PRMI we could do more, but we couldn't.

Looking at the direct reflection of PRM when IMC_PWR_IN=1.001W, the power between M5 (2" HR at [-X,-Y] corner downstream of RM2) and M6 (REFL LSC-ASC splitter) is 5.96mW after we swapped the optic.

At See Craig/Ryan's comments.

Clipping check in REFL path.

Nothing was clipping in the REFL path, but the beam was pretty high on M5 (that's the 2" HR at [-X, -Y] corner), M6 (ASC-LSC splitter), L1 (1" lens in front of LSC REFL sensors) and 2" lens on the WFS sled.

The beam height was ~105mm in front of M6 (see Georgia's picture), that's ~3.4mm higher than nominal, and the beam looks uncomfortably high on L1 because of the smaller aperture but it's not clipping.

We're leaving it as is because we don't want to touch the WFS sled and the only quick solution is to make the lens higher using a shim, then use M6 so steer the beam down on the LSC sensors.

Searching for the ghost beam of the main septum viewport.

The main PSL beam is reflected by the AR of the HAM1-HAM2 septum viewport and land inside the nozzle of the PSL-HAM1 viewport at around 4 or 5 o'clock position viewed from inside the chamber. See Georgia's pictures. We haven't done anything yet, we need help from people to assemble and install nozzle baffle.

Catching a snake.

That was big.

 

 

Tagging EPO -- look at that SNAKE!!

In-lab test of spare 9-45MHz WFS (Jordan, Rich, Keita)

We tested a replacement in-vac WFS for 9MHz/45MHz (ICS ASSY load D1102002-001, S1301248) in preparation for the upcoming HAM1 vent (E2200228).

Rich will write about the details, but in short we have tested that the DC power supply current was good, DC responded as expected, and RF outputs made sense for 9MHz and 45MHz. We used screw-on type ISC AM laser head for this test.

Attached show the LOW (9MHz) and HIGH (45MHz) results measured using the network analyzer. In these pictures, reference trace (green) is Q3 and the live (yellow) is either Q2, Q1 or Q4. All in all these look good in that there's no reason to suspect that they aren't working as intended.

Minor detail is that there are differences not just in overall level because the beam is not centered on the diode and the beam is not circular either, but sometimes in the shape of the traces (for example look at the Q2 HIGH at around the shoulder of 45MHz peak). We've confirmed that both the level and the shape changed when Rich rotated the AM laser head. Don't know why the shape changes but Rich mentioned that the modulation might not uniform across the beam, or maybe we're somehow saturating something (but it didn't change much when we reduced the modulation current by 10dB w/o rotating the head).

Summary of WFS spec

I am working on the Noisebudget Model these days and made a summary of the WFS in use with calibrations:

WFS	Serial No.	RF Trans. [Ω = V/A]						Responsivity [A/W]	Demod. Gain [dB]	Whit. Gain [dB] (40W)	ADC [cts/V]	Digital Gain	Cal [cts/W]
		Freq.	Q1	Q2	Q3	Q4	AVE
REFL_A	S1301242	9 MHz	894	894	1069	974	958	0.85	21	21	1638	1	1.7E8
		45 MHz	642	662	657	634	649			21		1	1.14E8
REFL_B	S1301243	9 MHz	822	873	742	861	824.5	0.85	21	21	1638	1	1.44E8
		45 MHz	678	644	635	648	651			21		1	1.14E8
AS_A	S1300635	36 MHz	810	828	872	891	850	0.85	21	12	1638	1	5.3E7
		45 MHz	707	718	732	766	731			3		1	1.6E7
AS_B	S1300634	36 MHz	846	904	826	832	852	0.85	21	15	1638	1	7.5E7
		45 MHz	644	711	719	691	691			3		1	1.5E7

 

Calibration (from W to cts) = RF Trans. * ADC * Responsivity * Digital Gain * 10^(Demod. Gain + Whit. Gain)/20