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

Looking at Squeezer FC ASC ADS

Camilla Sheila Mayank

Currently QPD Trans A is used for sensing the "INJ ANG" DOF, however we want to use ADS for this DOF.

Getting up the ADS  

1. We dithered FC1 and FC2 in Pitch and Yaw

   	Optics	Freq	Amp
   Pitch 1	FC1	10	10
   Pitch 2	FC2	12	10
   Yaw 1	FC1	6	10
   Yaw 2	FC2	8	10

2. Obeserved these frequency peaks on WFS signal ( H1:SQZ-FC_WFS_A_I_SUM_OUT_DQ   H1:SQZ-FC_WFS_B_I_SUM_OUT_DQ)
3. Demodulate Signal (Modified the ADS inmatrix to choose H1:SQZ-FC_WFS_A_I_SUM_OUT_DQ for dmodulation)
4. Fixing the right demod phase : At the right demod phase one of the demod quadratures (Q) will go to zero while the other quadrature (I) will respond to the beam spot movement.
   • This is done by continuoulsy changing the beam spot location* and monitoring the change in I and Q signal. From this change we estimated the phase offset required to bring the phase to right value.
     • If both I and Q move in same direction by approximately same amount the are off by 45/135 degree.
     • if only one of the quadratures move while the other remians constant the we are closer to the righr phase.
   • *Note: We changed the P2L/Y2L coefficient of FC1/FC2 , which amounts to changing relative position between the beam and the center of optics motion.

The ADS was running and we had the error signals. However we ran out of time and hence could not close the loop. We reverted everything to the previous state. We will try to repeat this during next commissioning time.

         

Ops Day Shift End

TITLE: 02/27 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:  Currrently Observing and have been locked for 5.5 hours. Easy day today, relocking when I came in was hands off, and relocking after the next lockloss was hands off besides requesting an initial alignment and TJ lowering the SRC2 P gain during OFFLOAD_DRMI.
LOG:

15:30UTC Relocking
16:14 NOMINAL_LOW_NOISE    
16:15 Observing

16:31 Commissioning

16:36 Lockloss
    - ran initial alignment
    - glitching during DRMI_LOCKED_CHECK_ASC/OFFLOAD_DRMI - SRC2 P gain lowered from 60 to 40 in script
17:42 NOMINAL_LOW_NOISE
    - Going between NLN and NLN_CAL_MEAS for commissioning activities
20:18 Back to Observing

                                                                                                                                                                                                                                                                                                                                                                                                                        

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:41	FAC	Nellie	OpticsLab	n	Tech clean	16:21
16:34	ISC	Sheila, Matt	LVEA	y(local)	Measuring POPAIR	16:43
17:42	FAC	Eric	EX (outside)	n	Replace chiller pump seal	21:53
21:01	FAC	Chris	XARM	n	Tumbling weeds	22:01
22:06	FAC	Eric	EX (outside)	n	Chiller pump work	22:35

OPS Thursday EVE shift start

TITLE: 02/27 Eve Shift: 0030-0600 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Observing at 150Mpc
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 9mph Gusts, 5mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.57 μm/s
QUICK SUMMARY:

• We've been locked for 5.5 hours
• The wind is low but the secondary microseism is high

Ran A2L script again

We ran the a2l_min_multi_pretty.py script again today since we made changes to the OMC offsets (alog83087). There were minimal gain changes, the only one I updated in lscparams.py was ETMY P from 5.49 -> 5.52.

The range coherence template we normally use was giving odd results during the quiet commissioning times after the OMC reverting, no coherence above 20Hz is seen. Sheila mentions that this is something she has seen before and isn't physical. We ran the script expecting changes but didn't see much change in gains or to the range.

RESULTS

|      |   | Initial | Final |  Diff |
| ETMX | P |   3.23  |  3.24 |  0.01 |
| ETMX | Y |    4.9  |   4.9 |   0.0 |
| ETMY | P |   5.49  |  5.52 |  0.03 |
| ETMY | Y |   1.35  |  1.34 | -0.01 |
| ITMX | P |  -0.53  | -0.54 | -0.01 |
| ITMX | Y |   3.21  |  3.22 |  0.01 |
| ITMY | P |   0.06  |  0.05 | -0.01 |
| ITMY | Y |  -2.74  | -2.75 | -0.01 |
 

Opened a new ISS PD array

Jennie Siva Keita Mayank

Following our previous attempt  here .  We opened a new ISS PD array (S.N. 1202965).
This unit is in great condition. i.e. 

1) No sign of contamination.
2) All the optics are intact (No chipping)

We tried interfacing the QPD-cable S1203257 with the QPD but it turned out that they are not compatible.
We will look for the updated version of the QPD cable.   

Partially disassembled ISS array

Jennie W, Rick S, Mayank C, Keita K

 

We went into the optics lab today with the intent for Rick to review the ISS array assembly we unboxed the other day (LHO alog #82731) on which we found some particulate contaminsation and some detached parts.. Rick and Keita are unsure how the support rods (first picture) were bent during transit and they appear to have bent at the top and deformed the cover piece (D1300717) they were attached to as they came unfixed at the other end and so were just resting on the top of the QPD mount plate (D1300719). They appear to have moved around and scored the surface of this platform. Maybe this happened in transit or storage but it seems like it would have had to be a large force and Rick says the storage containers were packed in form during transit.

 

1st package: Base piece (D1101074-v2 S/N 004) is double-bagged in my office and I have put in a clean and bake order as this spacer is site specific in height and some of our ISS spares will have a spacer set to the L1 beam height instead so we may need to swap it out.

2nd package: Cover piece D1300717 with the spacing posts attached is not bagged properly as we probably do not want to reuse this and so it is in Keita's office.

3rd package: Array and mirror assembly with PDs still attached was wrapped in foil with dry sealed clean room wipes protecting top optic in periscope, then double-bagged. Shown in center left of this image. This will need re-cleaned if we want ot scavenge parts form it.

4th package: All the other parts from assembl y shown in this image ( apart from PD assembly, baseplate, tool pan and top cover) have been packaged up in foil and double bagged in one package. These will also need recleaned if reused.

These last two packages are stored in the cabinet that the spare ISS array units are in, situated in the vacuum bake prep area next to the PCal lab. The shipping cover and base plate for the array are also back in this cupboard.

For reference the assembly drawing can be found here.

The assembly we worked on has the dcc ref S12020967

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