OPS Day Shift Start

TITLE: 02/13 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 3mph Gusts, 1mph 5min avg
    Primary useism: 0.02 μm/s
    Secondary useism: 0.25 μm/s
QUICK SUMMARY:

 

Workstations updated

Workstations updated and rebooted.  This was an OS package update.  Conda packages were not updated.

2-12 vent vacuum diary

Today's activities:
- The Corner pumpdown has been started. After 5h50min pumping, we are at 250 Torr
- HAM6 / HAM5 common Annulus volume is now pumped also with the Ion pumps, they are at the mid-E-6 Torr range
- EX pumping status: 4.65E-8 Torr
- EX RGA bakeout has been ramped down; it is now ready for a post-vent RGA scan
- HAM8 RGA is being pumped. The HAM8 turbo pump has also been started up, they are now ready to be valved in and for a pre-vent RGA scan, although there are issues, see here: https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=75814

Field Cabling for SQZT8 Disconnected

WP 11689

The field cabling to the SQZT8 enclosure are now disconnected. Part of the safety interlock system was moved away from the table (Beckhoff 1908 field box). This required the door & panel status cable to be disconnected. Safety MEDM is showing SQZT8 in a fault (panels and doors open). FCES E-stop button is still active.

OPS Monday day shift summary

TITLE: 02/12 Day Shift: 16:00-00:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: The HAM7 doors are ready to be put back on, the CS pumpdown has begun, and EndX & HAM8 are being prepped to be vented.

• HAM7 closeout work
  • Beam diverted checked, irises removed alog75826
  • Grounding loops checked alog75827
  • ISI unlocked
  • transfers functions looked good in terms of SEI and SUS
• EX vent prep
  • RGA scans
  • BRS checks
• HAM8 vent prep work
  • SQZT8 table was prepped to be moved and then disconnected by SQZ and EE
  • RGA scans
• CS pumpdown has begun
• Crane inspections finished at the ends and CS

17:59UTC SUS ZM5 WD trip, LVEA RED pressure alarm 18:30UTC, a few PSL anteroom yellow dust alarms throughout the morning/early afternoon then several red alarms around 22-23UTC.

21:12UTC ISI HAM7 WD trip, maybe from Gerardo turning down the purge air? ISI HAM5 & 7 tripped a few minutes later 21:18UTC and the motion was too high to untrip for a bit (~ 4 minutes), probably from the VAC teams work, sudden changes in pressure? Tagging VE, SEI. They retripped 2 minutes after I reset them after the motion look like it had calmed down. I'm going to leave them tripped for now.

21:51UTC the CS pumpdown started!

LOG:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:30	FAC	Kim & Karen	LVEA	N	Tech clean	16:16
16:04	FAC	Contractors	EndY then X	N	Crane inspection	19:07
16:16	FAC	Ken	LVEA	N	Check pump	17:41
16:58	VAC	Travis	LVEA	N	Vac checks	17:17
17:15	SUS	Rahul	LVEA, HAM7	N	HAM7 checks	18:35
17:17	VAC	Travis	EndX	N	Check on RGA	17:50
17:28	EE	Fil	LVEA, mech rm	N	HAM7 grounding checks, SUS to SAFE HAM7	19:40
17:40		Camilla, Betsy	HAM7	N	Closeout work, Betsy out @ 17:51UTC	17:54
17:50	VAC	Gerardo	LVEA	N	Check viewports are covered, pumpdown prep	19:09
17:50	EE	Ken	EndX then LSB	N	Lights	23:23
17:53	FAC	Karen	LVEA	n	Tech clean	18:12
18:00	VAC	Jordan	LVEA	N	Join Gerardo	19:09
18:31	VAC	Travis	EndX	N	RGA	23:11
18:34	FAC	Karen	EndY	N	Tech clean	19:41
18:38	FAC	Richard	LVEA	N	Talk with Vac & Fil	19:38
18:43	SUS	Rahul	LVEA	N	Check with Fil	18:48
19:01	SUS	Rahul	LVEA, HAM7	N	Adjust BOSEM flag	19:15
19:17	SEI	Jim	LVEA, HAM7	N	unlock ISI	19:47
19:17	SQZ	Camilla	LVEA	N	Check beam diverter	19:49
19:47	FAC	Chris + contractors	LVEA	N	Crane inspection	19:57
19:48	FAC	Tyler	FCES	N	Check equipment	19:50
19:48	SEI	Jim	CR	N	HAM7 transfer functions	20:32
19:49	SQZ	Camilla & Julien	FCES	N	Check SQZT8	20:43
20:36	SUS	Rahul	CR	N	SUS H7 transfer functions	22:36
20:53	SEI	Jim	EX, EY	N	EX - check BRS, EY - wind fence	23:13
21:07	VAC	Jordan	LVEA	N	Prep for pumpdown	21:51
21:11	VAC	Gerardo	LVEA	N	Join Jordan	21:51
21:51	VAC	Garardo, Janos, Jordan	LVEA	N	Start CS pumpdown (excluding HAM7), Gerardo out 23:10UTC	Ongoing
23:23	EE	Ken	EndX	N	Move lift from EndX to EndY	Ongoing
23:26	EE	Fil	FCES	N	Disconnect SQZT8	Ongoing

SUS HAM7 close-out transfer function measurements are healthy

HAM7 doors can be now closed since all the suspensions in the chamber are healthy as per the latest measurements I took this afternoon.

Attached below are the results for ZM1-5, FC1 and OPO suspensions.

SQZT8 position marked and everything on table secured

Julian, Camilla 

Prior to the SQZT8 ISC table move, Julian and I marked the current position of the corners of the table with red crosses using a plumb-bob.

We attached loose optics and cables and cable tied a loose electronic box. We placed some filters and the camera covers in a small plastic bag and secured to the table. There is an accelerometer inside not yet plugged in.

HAM7 Ground Loop Checks

D2000202 A+ SUS HAM 7 System Wiring Diagram
T1200131 Grounding and Shielding at LIGO
D1900511 ISC/SQZ Wiring Diagram

Ground loop checks for HAM7 complete. No issues to report. Some cables previously modified per E2100504. Other don’t have Pin 13 and shield tied per T1200131. See alog 65129 for more details.

 A list of cable tested:

Description	Cable	Location
FC1 TOP	SUS_FC1_001	SUS-R4
FC1 TOP	SUS_FC1_002	SUS-R4
FC1 MIDDLE	SUS_FC1_003	SUS-R4
FC1 Bottom	SUS_FC1_004	SUS-R4
VOPO	SUS_OPO_001	SUS-R4
VOPO	SUS_OPO_002	SUS-R4
ZM1-M1	SUS_ZM1_001	SUS-R4
ZM1-M2 Dither	SUS_ZM1_006	SUS-M1
ZM2-M1	SUS_ZM2_001	SUS-R4
ZM2-M2 PSAMS	AWC_ZM2_006	SQZ-R1
ZM3-M1	SUS_ZM3_001	SUS-R4
ZM3 M2 Dither	SUS_ZM3_006	SUS-M1
ZM4-M1	SUS_ZM4_001	SUS-R4
ZM4-M2 PSAMS	AWC_ZM4_006	SQZ-R1
ZM5-M1	SUS_SQ_002	SUS-R4
ZM5-M2 PSAMS	AWC_ZM5_006	SQZ-R1
Oven Trans/Cav Piezo	ISC_SQ_303	SQZ-R2
SQZ Thermistor & TEC	ISC_SQ_304	SQZ-R2
SQZ DCPD & LENS Trans	ISC_SQ_305	SQZ-R2
Picomotor	ISC_SQ_470	ISCT7
Picomotor	ISC-SQ_471	ISCT7
SQZ-FC_QPD_A	ISC_SQ_479	SQZ-R1
SQZ-FC_QPD_B	ISC_SQ_480	SQZ-R1
OFI2	ISC_SQ_482	SQZ-R2
SF1	ISC_SQ_483	SQZ-R2
SF2	ISC_SQ_484	SQZ-R2

HAM7 ISI tfs look ok

HAM7 ISI is unlocked. Tfs look normal for this chamber, no rebalance was needed, so I think we are good to close.

OPS Monday day shift update

• HAM7 closeout work
  • EE grounding loop checks, finished
  • Beam diverted checked
  • Irises removed
  • SUS Transfer functions, will be run after SEI TFs finish
  • SEI ISI locking, finished
    • SEI transfer functions ongoing
• VAC EX RGA, ongoing
• Corner station is being prepped for the pumpdown by VAC team
• Site crane inspections, the ends have been inspected I believe and the LVEA has been done

HAM7 close-out exit check list

Given below are the list of things I did in HAM7 to prepare for the close out of the chamber.

- Took particle counts outside and inside the chamber and they were zero (inside chamber) and few tens (outside chamber).

- Removed the two irises from the chamber and handed it over to Camilla (wrapped and bagged).

- ZM4 & ZM5: checked their pitch adjuster is locked, checked their dog clamps, checked all the EQ stops, centered the BOSEMs and took transfer function measurements - they look good.

- Confirmed that all wiring appears properly secured and is free of the beam path.

- Placed a silicon wafer inside the chamber on the ISI table.

- Removed all tools from the chamber (checked it twice).

- Took pictures - attached below.

Currently Fil is performing ground loop checks and Jim is un-locking the ISI.

We will be ready to put the doors once SEI and SUS transfer function measurements comes out healthy.

HAM7 Beam diverter check, irises removed.

As part of the HAM7 close out procedure, Jim and I checked the HAM7 beam diverter opened and closed fine after Fil's ground loop checks. 

Rahul has removed the two irises from HAM7. 

H1 ISI CPS Noise Spectra Check - Weekly

Closes FAMIS 25978, last checked in alog75608

Script reports that ETMX_ST1_CPSINF_V2 is elevated, not too suprising since EX is being RGAed and pumped down.

The chambers are definetly noisier but thats expected as we're venting and doing the planned vent work

HAM6 Doors Installation

(Randy P., Jordan V., Janos C., Gerardo M.)

We installed two doors on HAM6.  +X door went on very smoothly, no problems. -X door we had a small issue with the inner o-ring, did not wanted to stay put, it took some convincing, no new issues to report.

We are currently pumping down the annulus system with two aux carts, thus far the vacuum pressure at the aux carts pumping the AIPs appears nominal.

BRS Remote Mass Adjuster Install

[Michael, Jim, Tony, Shoshana, Neil]

We've spent the week working on installing a remote mass adjusting/balancing system for the End-X BRS. Upon opening the End-X BRS we discovered that it is slightly different than the other BRSs (most likely because it was the first one built, photo 1 below) so we had to get a couple extra parts machined for the parts we brought from UW to fit properly. The hardware has finished being installed (photo 2), and we've run a quick test of the picomotor (Newport  8341-UHV) to make sure it has full range of motion. We've finished closing the BRS up and are now waiting for it to pump down before doing some additional in-vacuum tests. 

We are writing up some installation and balancing instructions as well as leaving another set of parts, so a remote balancing system can be installed on the other BRS. We assume the End-Y BRS should fit the drawings on the dcc (D1800045), so no additional parts should need to be machined. We are also leaving 16 flexures here with Jim.


The pico motor controller chassis was not working, so we are leaving our UW picomotor driver (Newport 8742) here so that the End-X BRS can be adjusted until the chassis is fixed. Once it is fixed the in-air wiring will need to be re-connected to get the motor to the chassis. For now adjusting will have to be done with a laptop at the End-X station, but once hooked up to the chassis, adjustments can be made from the control room.

HAM6 work Jan/29/2024: Alignment of the laser into the new OMC, day 4 (Camilla, Vicky, Julian, Rahul, Sheila, Betsy, Keita)

day 1 (alog 75548), day 2 (alog 75557), day 3 (alog 75575)

HAM7 irises were good

Sheila/Camilla checked the iris position on HAM7 and it was good.

ASC-AS_C whitening gain was increased by 18dB, dark offset was reset

I didn't like that the ASC-AS_C input was so small. Increased the whitening gain by 18dB (from nominal 18dB to 36dB) and reset the dark offset.

Recentered the beam on ASC-AS_C. One thing that was strange was that the ASC-AS_C_NSUM would become MUCH bigger (like a factor of 10) when SRM is misaligned. I was worried that I was looking at a ghost beam. Camilla measured the  beam power to be ~1mW out of HAM7 and ~0.7mW into HAM6. When ASC-AS_C was centered, ASC-AS_C_NSUM_OUT became ~0.008 give or take some. Taking the 16dB extra whitening (i.e. a factor of 8) into account, ASC-AS_C_NSUM~0.008 means about 1mW into HAM6, which was in a ballpark, so I convinced myself that the beam on AS_C was good.

HAM6 irises and beam height on OM, the beam was still very low on OM2

At this point OMC QPDs are reasonably centered, so Sheila and Camilla checked the beam position on irises in HAM6.

The beam was OK on the first iris but was a bit low (~2mm) on the iris closer to the OM1.

The beam position on OMs at this point as well as the slider values and max DAC output are listed below (see Camilla's pictures, too). Note that the YAW position in the table is the position of the incoming beam on the mirror measured at some (unknown) distance, it's not on the mirror.  

	OM1	OM2	OM3
Beam height (nominal 4")	1/8" too high	1/4" too low	1/16" too low
YAW position	1/8" to +X	1/32" to -X	Cannot measure
PIT slider	430	20	610
YAW slider	600	1300	-231
Max DAC output	11k	7k	9k

The beam was clearing the input and output hole on the shroud, was cleanly hitting the small OMCR steering mirror by the cage, and was already going to the OMCR diode.

They confirmed that the OMC trans video beam was visible on the viewer card when OMC flashes and it was hitting the steering mirror (but we need a viewport simulator to see if the beam will clear the viewport aperture).

Bringing the beam up higher on OM2

Unfortunately the beam was still very low (~1/4"), however I was able to use OM1 alignment slider to bring the beam up on OM2 and use OM2/3 alignment sliders to still center the OMC QPDs. After this was done, OM2 PIT offset became large but OM1/OM3 offsets became low-ish. This was a very good sign as it's infinitely easier to mechanically tilt OM2 than OM1/OM3 due to superior mechanical design.

Anyway, by doing this, the beam height on OM2 went up by about 1/8" (see Rahul's pictures). It's still too low by 1/8", but bringing the beam up more would mean that OM3 DAC output will become large w/o mechanically relieving, which I didn't want to do, so I decided to stay here.

	OM1	OM2	OM3
Beam height	1/8" too high (didn't measure, no reason to suspect that it changed)	1/8" too low	1/16" too low
PIT slider	20	2710	-590
YAW slider	650	660	60
Max DAC output	7.2k	21k	7.1k

Mechanically relieving the OM2 PIT offset

Julian set the OM2 PIT slider gain to 0.75 (from 1), Rahul turned the balance mass screw on the upper mass of OM2 to compensate. We repeated the same thing four times (slider gain 0.75->0.5->0.25->0, each step followed by Rahul's mechanical adjustment). We had to adjust OM2 Y slider in the process to bring the beam back to the center of the OMC QPDs, but overall, this was a really easy process (did I mention that tip-tilt adjustment is not an easy thing to do?).

We ended up with this (we haven't measured the beam height again as OM2 was the only thing that moved, so the height numbers are from the previous table just for convenience).

	OM1	OM2	OM3
Beam height (didn't measure, no reason to suspect that they changed)	1/8" high	1/8" low	1/16" low
PIT slider	20	0	-590
YAW slider	650	760	60
MAX DAC output	7.2k	5k	7.1k

I declared that this is a good place to stay. Rahul fixed the balance mass on OM2 upper mass.

Rahul also fixed the balance mass on OMCS.

Fast shutter path, WFS path, ASAIR path, OMCR path

We closed the fast shutter and the reflected beam goes to the high power beam dump.

We opened the fast shutter and checked the WFS path. The beam was already hitting one quadrant of WFSB but was entirely missing the WSFA. The beam was a bit low on the lens on the WFS sled, so I used two fixed 1" steering mirrors upstream of the WFS sled to move the beam up on the lens and keep the path reasonably level. See Rahul's pictures for the beam height. After this, both WFSs saw the light, and at this point we used pico to center both. We weren't able to see the beam reflected by the WFS but assume that it still hit the black glass.

We tried to see the ASAIR beam but couldn't. Since the beam is hitting the center of ASC-AS_C, we assume that the ASAIR beam will still hit the black glass.

OMCR beam was already hitting the OMCR photodiode, but the beam was REALLY close to the beam dump that's supposed to catch ghost beam. We temporarily moved the dump so the beam is about 5mm from the edge of the glass, but this might be too far. I'll find how close it's supposed to be from the past alog.

Couldn't check if PZT1 is working.

We tried to see if OMC length error signal makes sense when scanning the OMC length, but whenever the OMC is close to resonance there was a huge transient in the DCPD SUM as well as the length signal, probably the intensity noise (due to acoustics or jitter or something) is too much. We'll measure the capacitance of the PZT from outside.

Current status of LVEA

Laser hazard, HAM5 GV is closed, HAM6 and HAM7 curtains are closed.

Remaining tasks

• Laser is required: Move the irises on HAM6 to the current beam position.
• Laser is required: OMCR path (beam dump position).
• Laser is required: OMC trans video path. Use viewport simulator.
• Check OSEMs of OMCS and OMs, recenter if needed.
• Restore the shroud panels.
• Restore the OMC trans beamdump on the -Y side.
• PZT1 capacitance check, grounding check etc.

Possibly clipping at a beam dump.
In picture "beforemoving" it can be seen how the beam hits the outer left edge of the IR card and this side "touches" the beam dump.
We have moved the beam dump because the beam is centered on the lens.

EY wind fence needs repair again

For the record, late alog - a couple weeks ago the EY wind fence was found to be damaged, again from early JAN severe winds (50+mph gusts for a few days).

Plans are in place to repair it with an improved round of reinforcement.  A second snorkel lift is being delivered to aid in the repair scheduled for ~next week.  FRS ticket filed.

Unplugged and replugged HAM7 FC 532nm Fiber from Feedthorugh

For the VAC team to bag and leak check the HAM7 leaky fiber feedthorugh FRS30141, yesterday afternoon I unplugged the  HAM7 FC 532nm Fiber from the Feedthrough, covered with a plastic endcap and then replugged in when the VAC team was finished. 

Driving PR3 pitch and yaw at low frequency

Sina, Elenna, Kevin, Evan

Similar to Anamaria's measurements at Livingston last year (LLO:58623), we drove PR3 sinusoidally in pitch and yaw at low frequency to try to ascertain the amount of beam spot motion coupling into the arms. The following times are all 2023–04–12 UTC:

• 17:10:00 to 17:16:00 — quiet time
• 17:19:45 to 17:29:45 — PR3 pitch, 0.34 Hz, ~0.02 µrad
• 17:32:00 to 17:38:00 — PR3 pitch, 0.34 Hz, ~0.04 µrad
• 17:39:46 to 17:45:00 — PR3 yaw, 0.34 Hz, ~0.02 µrad
• 17:49:00 to 17:55:00 — PR3 yaw, 0.11 Hz, ~0.02 µrad
• 17:55:30 to 18:01:30 — PR3 pitch, 0.11 Hz, ~0.04 µrad