IR aligned to new OPO, working on alignment to irises and apertures

Sheila, Kar Meng, Elenna

Using the new dither lock settings from yesterday, 88686, we were able to see this morning that we were aligning to a higher order mode with two nodes displaced vertically from each other.  We had aligned one of the nodes to reach the IR PD on SQZT7 before the holidays, the other node and the location where you would expect the 00 mode to be were clipping on the way to the PD, which is why we were having a hard time alignnig IR to the OPO using that PD.  With the dither lock on the higher order mode, we adjusted the alignment between the OPO and SFI1 TPF using A:M1 and A:M2 (page 9), so that the mode was roughly centered on our irises and still reaching SQZT7.  

We were able to iteratively improve the alignment of the seed into the OPO by manually finding resonances to set the dither lock to, once we locked to a 10/01 mode we were able to improve the alignment to the IR PD on SQZT7, which then made it easier to improve the seed alignment into the OPO so that we could lock on the 00 mode, realign to the irises using A:M1 and A:M2.  Finally we fine adjusted the seed alignment into the OPO with the cavity scanning.  

Now we can easily dither lock the OPO on the 00 mode, it's quite stable, and with the cleanroom lights off we can easily see this beam on the irises in HAM7 (and SQZT7).  We attempted to align the sqz beam using only A:M1 and A:M2, but these are so degenerate that it seems rather difficult to do.  Betsy loaned us a class B knob small enough to reach the tricky yaw actuator on A:M2, but we still found this difficult.

We decided to set A:M1 and A:M2 so that the seed beam transmitted by the OPO hits our irises after ZM1 and ZM3 and returns through SFI1 toward the B path without clipping, which should set the AOI on SFI1's TFP close to what it was before the cavity swap.  Our plan is to then adjust B:M1 and B:M4 to hit the iris on ZM4 and SQZT7.  For some alignments we are clipping on the aperture attached to A:L2, for others we are clipping on SF2.  We stopped for the day after switching back and forth between these two a couple of times, we have reduced the amount of clipping but still see that we are not well aligned.  

OPS Tuesday Day shift summary

TITLE: 01/07 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAMs 7 and 1 work continued today, HAM1 crew is still out at the chamber as of 00:30UTC.
LOG:                                                                                                                                                                                                                                                                     

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
17:16	HAZ	LASER HAZARD	LVEA	Y	LVEA IS LASER HAZARD	01:35
15:38	FAC	Nellie	Optics lab	LOCAL	Tech clean	16:00
16:08	FAC	Kim, Nellie	LVEA	Y	Tech clean	17:36
16:41	SQZ	Sheila	LVEA	Y	HAM7 work	19:45
17:01	FAC	Chris+contractors	LVEA	Y	Pest controls	17:11
17:12	FAC	Chris+contractors	Ends, Y then X	N	Pest control	18:11
17:33	SQZ	Elenna	LVEA	Y	Join HAM7 work	19:44
17:36	VAC	Travis, Jordan	LVEA HAM1	Y	Add Septum viewport covers	18:11
17:40	PSL	Jason	PSL enc / LVEA	Y	Laser diode centering	19:57
17:43	sQZ	Karmeng	SQZt0	yes	Helping Sheila on the SQZr table	19:44
17:58	FAC	Nellie	EndY	N	Tech clean, garb restock	18:52
17:58	FAC	Kim	EndX	N	Tech clean, garb restock	18:25
18:12	FAC	Chris	LVEA	Y	FAMIS tasks	18:32
18:14	ISC	Betsy, Jennie, Masayuki	LVEA	Y	HAM1, Betsy out 18:26 UTC	20:02
18:20	PSL	RyanS	LVEA	Y	Lock PSL rotation stage	18:27
18:24	VAC	Travis	HAM1	Y	Grab phone	18:27
18:25	FAC	Kim	FCES / HAM SHAQ	N	Tech clean	18:53
18:33	FAC	Chris	Out buildings	N	Checks	20:45
18:58	ISC	Betsy	LVEA	HAM1	Join JAC crew	19:59
19:58	CAL	Tony	PCAL lab	LOCAL	Open apeture and start a meas	20:15
21:10	SQZ	Sheila, Kar Meng, Elenna	LVEA	Y	HAM7 chamber work	00:08
21:25	SEI	Jim	LVEA	Y	Move hardware around HAM1	21:32
21:29	ISC	Rahul, Masayuki, Jennie, Jason	LVEA	Y	HAM1 JAC work, pop into optics lab as well	Ongoing
22:02	VAC	Jordan	LVEA	Y	Help strap down a compressed gas cylinder by HAM1	22:21
22:38	CAL	Tony	LVEA/Optics lab	Y/LOCAL	Get optics case and lens wipes for HAM1 crew	23:04
23:11	ISC	Betsy	LVEA	Y	Join HAM1 crew	23:18
23:54	ISC	Betsy	LVEA	Y	Bring parts	00:27
00:10	VAC	Travis	LVEA	Y	Take a look around HAM1	00:17

17:47 UTC HAM1 ISI WD trip (left tripped)

Dust Monitor Trends - Monthly

FAMIS 37260, last checked in alog88278

Couple of peaks over the past few days which might correspond to high winds, but otherwise these look good for the duration including the holiday break and vent work.

PSL 10-Day (+7) Trends

FAMIS 31119

Pulling these trends for an additional week back to capture the duration of the holiday break. Main changes over this time were the PMC and RefCav transmission dropping while PMC reflected power increased, but not sure exactly why at this point. The periodic temperature spiking we've been seeing in the diode and chiller rooms appears to have mostly stopped as of the start of the break. We think this was due to the mini-split turning on, so I'll check with facilities if a setting was changed that could have caused this.

There has been work in the enclosure starting as of yesterday, which explains the change in many trends starting then.

FYI - Picket Fence data server comment - all good

Brian, Edgard, TJ Shaffer,

I got a group email from the USGS letting people know about an update to their data services. We checked and this does not impact the picket fence. I'm putting some email here for documentation

-Brian

 ---

 

From: Edgard Luis Bonilla <edgard@stanford.edu>
Subject: Re: [Data Announcements] EarthScope fdsnws-dataselect service has moved to service.earthscope.org
Date: January 5, 2026 at 5:01:56 PM PST
To: Brian Thomas Lantz <blantz@stanford.edu>
Cc: TJ Shaffer <thomas.shaffer@LIGO.ORG>, "michael.thomas@ligo.org" <michael.thomas@ligo.org>

Confirmed. The picket fences work. 

Please let me know if anyone sees any issues and we will address them.

(... and ...) 

I don't think this will be an issue. We don't use any restricted data for the Picket Fence. 

I will go down to the lab before end of day to confirm we can still run it. 

Best,
Edgard Bonilla

From: Brian Thomas Lantz <blantz@stanford.edu>
Sent: Monday, January 5, 2026 4:11 PM
To: Edgard Luis Bonilla <edgard@stanford.edu>
Cc: TJ Shaffer <thomas.shaffer@LIGO.ORG>; michael.thomas@ligo.org <michael.thomas@ligo.org>
Subject: Fwd: [Data Announcements] EarthScope fdsnws-dataselect service has moved to service.earthscope.org
 
Edgard - 
I got this notice about the seismic network over the break. Do we need to do anything about this?
-Brian

Begin forwarded message:

From: Chad Trabant <chad.trabant@earthscope.org>
Subject: [Data Announcements] EarthScope fdsnws-dataselect service has moved to service.earthscope.org
Date: January 1, 2026 at 11:47:37 AM PST
To: data-announcements@earthscope.org
Reply-To: data-announcements+managers@earthscope.org

Happy new year!

EarthScope's fdsnws-dataselect web service, the primary source of miniSEED data from our seismological repository, has moved from service.iris.edu to service.earthscope.org as part of our cloud transition.

Details are below and documented on the service documentation page:
https://service.earthscope.org/fdsnws/dataselect/1 

We've worked to make this transition seamless, but if you encounter issues please contact help@earthscope.org.

Action required for restricted data users: You will need new credentials. Visit https://www.earthscope.org/user, create an account (if you do not already have one), then:

navigate to the
 Credentials tab

click "REVEAL MY
 CREDENTIALS," and then "CREATE FDSNWS CREDENTIALS" if none exist.  These credentials are specific to you and should be kept private.

Redirects from the old service to the new

The old service location (at service.iris.edu) continues to operate, but instead of providing data redirects to the new location.  The vast majority of web software follow these redirects automatically or can be configured to do so.

New HTTPS (TLS v1.2+) requirement

The service now requires secure HTTPS, specifically TLS 1.2 or later. Requests to the un-secure HTTP endpoint will be redirected to the HTTPS endpoint according to current best practices.

Some older software may not follow redirects from unsecure HTTP to secure HTTPS.  Configure the software, if possible, to use the direct URL to the service https://service.earthscope.org/fdsnws/dataselect/1

Some older software may not support TLS 1.2+.  As this standard was defined in 2008 and became default on most client and server software by 2016, we do not anticipate this causing many problems.

More details for client developers and power users
Changes in the new service:

Some output formats are not yet supported: SAC and text. These will be added later.

The
 following parameters are being permanently retired: quality,
minimumlength,
longestonly,
repository,
szsrecs.

With the removal
 of the szsrecs
 parameter the service will no longer remove zero-sample records (as was the previous default), which matches the behavior of all other data center implementations.

There are limits
 on the volume of data that will be returned. We recommend limiting requests to one station for a 24-hour period at the most.

Some HTTP response codes for errors have changed to be more precise, but they remain
 broadly recognized codes.

Please reach out to help@earthscope.org if you have any questions or run into trouble with this new service.

Thanks,
The EarthScope Data Services team

 

-- 
More info on EarthScope mailing lists: https://www.earthscope.org/news/mailing-lists/
--- 
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To unsubscribe from this group and stop receiving emails from it, send an email to data-announcements+unsubscribe@earthscope.org.
To view this discussion visit https://groups.google.com/a/earthscope.org/d/msgid/data-announcements/CAGJXgS5UnSPZOAt5fw8YUOTTSfHJbMJoS6SDC_LgW4ZVjv91PA%40mail.gmail.com.

Tue CP1 Fill

Tue Jan 06 10:01:38 2026 INFO: Fill completed in 1min 37secs

Short fill because discharge line pressure had been bumping up since last fill.

PSL mode match lens replacement

[Jason, Jennie, Masayuki]

• We swapped and installed three new lenses—IO_MB_L1 (Rc = 250 mm), L2 (Rc = −150 mm), and L3 (Rc = 750 mm)—replacing the existing lenses with the same notation. The former two are 1″ diameter lenses, and the latter is a 2″ lens. All lenses were mounted in Newport lens mounts, with posts and post holders installed on Thorlabs BA2 bases.
• Set the power stage to 2 W with 100 W of PMC output. The power along the path where the new lenses were installed was then reduced as much as possible using IO_MB_HWP1.
• Before swapping the lenses, two irises were placed to provide alignment references. The final reference is the set of irises in HAM1; however, the in-PSL iris allowed alignment without external communication and made the process easier. These irises were placed downstream of the existing IO_MB_L2.
• After removing the old lenses, the new IO_MB_L1 was installed such that the distance from IO_MB_M2 to L1 was 0.22 m. The beam was centered on the iris by adjusting the lens position. Subsequently, L2 was installed 6 cm downstream of L1 using the same procedure.
• After alignment, we verified that the beam path around the beam adjustment stage was not clipped by any optics. All beam positions appeared nearly identical to those before the work began.
• The third lens was then installed between IO_MB_M4 and M5 (the bottom mirror of the periscope) with a separation of 9 cm. To ensure the lens was centered on the beam, we centered the iris on the beam reflected from IO_AB_BS1 before and after installation. To observe the transmitted beam from M4, higher power was required; therefore, IO_MB_HWP1 was rotated to increase the EOM output power to 4–5 W.
• The first and second pictures document the original lens positions, in case recovery of the mode matching directly to the IMC is required.
• After completing the work, all power levels were restored. During this period, the new lenses were inspected with an IR viewer to confirm the absence of unusual stray light or unintended beam exposure.
• Remaining work: alignment of the photodiodes monitoring the EOM output and PSL output. Since the overall beam profile has changed, it may be necessary to reposition the lenses to properly focus the beam onto the PDs.
• During the work we found the beam is almost clipped on the beam dump capturing the mispolarized beam difracted by the EOM. So, we move the beam dump. The third picture shows this beam dump.

OPS Tuesday Day shift start

TITLE: 01/06 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 5mph Gusts, 2mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.31 μm/s 
QUICK SUMMARY:

• JAC (HAM1, potentially more PSL enclosure), HAM7 work continues
• NUC5 was dead and I restarted it

Workstations updated

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

OMC HV Power Supply

WP 12953

I was notified of a buzzing/whistling sound coming from the CER mezzanine. The HV power supply for the OMC PZT was found with audible alarm on and LCD screen not displaying correctly. Power supply was power cycled. Unit tripped immediately. With unit off, the field cabling going to LVEA was disconnected. Unit tripped when powered on. Unit was replaced with spare.

F. Clara, R. McCarthy, M. Pirello

Changes to IR dither lock setting

[Sheila, Karmeng]

To align OPO IR beam, we try to lock the IR dither lock at fundamental, but we were unable to see the error signal and dither. CLK_gain were changed from 0.1 to 1000, and the demodulation phase from 245 to 225. The resulting error signal as attached. A 200Hz wide bandpass filter added to the PD input dither around 3kHz, LSC_servo_gain changed from -10 to -300 to lock the OPO.

We also adjusted the beamsplitter (position before the IR camera) to center the IR beam on SQZT7 IR camera.

OPS Monday Day shift summary

TITLE: 01/05 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM7 and JAC work continued today.                                    

Start Time	System	Name	Location	Lazer_Haz	Task	Time End
15:57	SAF	LASER SAFE	LVEA	NO	LVEA is Upgrade Phase Laser SAFE	17:16
16:46	FAC	Nellie, Kim	LVEA	N -> Y	Tech clean	17:29
17:00	OPS	Oli	LVEA	N -> Y	Transition to HAZARD	17:16
17:15	ISC	Jennie	Optics lab	LOCAL	Gather JAC parts	17:32
17:16	HAZ	LASER HAZARD	LVEA	Y	LVEA IS LASER HAZARD	01:35
17:26	SQZ	Sheila	LVEA	Y	Turn on SQZ laser, maybe take a look at the table	17:55
17:29	FAC	Nellie	MidY	N	Tech clean	18:26
17:32	FAC	Kim	EndX	N	Get garb	18:38
18:06	ISC	Jennie, Rick	PCAL lab	LOCAL	Get parts for JAC	18:20
19:01	ISC	Betsy	LVEA	Y	Check on headsets	19:14
19:20	EE	Marc, Fil	CER	Y	Investigate failing PS, HV HAM6 pzt	20:26
21:26	ISC	Jason, Jennie, Masayuki	PSL enc	Y	JAC work	Ongoing

19:32 UTC HAM1 ISI WD tripped

21:32 UTC DAQ restart

h1ascimc model change and DAQ restart

Jennie, Erik, Dave:

Jennie's new h1ascimc model was installed at 13:30 Mon 05Jan2026. This required a DAQ restart to add 2 slow channels.

At 13:32 we restarted the 1-leg, followed by the 0-leg at 13:37. GDS1 did not need a restart.

Following this DAQ restart we had 3 sponaneous restarts of FW1 after it had ran for 27:48, 8:02 and 6:22 minutes respectively. At the time of writing it has been running with no further restarts for an hour.

 

 

Mon CP1 Fill

Mon Jan 05 10:04:11 2026 INFO: Fill completed in 4min 8secs

I increased the setting for thermocouple nominal max from 20C to 30C to match current values and remove a VAC-SDF diff.

Ground Seismometer Mass Position Check - Monthly

Closes FAMIS38887 , last checked in alog88362

HAMs 1-4, 7 and BSC2 are in non nominal SEI states due to the vent work.

2026-01-05 08:58:15.266231
There are 14 T240 proof masses out of range ( > 0.3 [V] )!
ETMX T240 2 DOF X/U = -1.625 [V]
ETMX T240 2 DOF Y/V = -1.709 [V]
ETMX T240 2 DOF Z/W = -0.94 [V]
ITMX T240 1 DOF X/U = -2.28 [V]
ITMX T240 1 DOF Y/V = 0.313 [V]
ITMX T240 1 DOF Z/W = 0.485 [V]
ITMX T240 3 DOF X/U = -2.433 [V]
ITMY T240 3 DOF X/U = -1.065 [V]
ITMY T240 3 DOF Z/W = -2.971 [V]
BS T240 1 DOF Y/V = -0.372 [V]
BS T240 3 DOF Z/W = -0.449 [V]
HAM8 1 DOF X/U = -0.316 [V]
HAM8 1 DOF Y/V = -0.444 [V]
HAM8 1 DOF Z/W = -0.755 [V]

All other proof masses are within range ( < 0.3 [V] ):
ETMX T240 1 DOF X/U = -0.007 [V]
ETMX T240 1 DOF Y/V = -0.041 [V]
ETMX T240 1 DOF Z/W = -0.024 [V]
ETMX T240 3 DOF X/U = -0.016 [V]
ETMX T240 3 DOF Y/V = -0.069 [V]
ETMX T240 3 DOF Z/W = -0.045 [V]
ETMY T240 1 DOF X/U = 0.066 [V]
ETMY T240 1 DOF Y/V = 0.208 [V]
ETMY T240 1 DOF Z/W = 0.266 [V]
ETMY T240 2 DOF X/U = -0.075 [V]
ETMY T240 2 DOF Y/V = 0.226 [V]
ETMY T240 2 DOF Z/W = 0.049 [V]
ETMY T240 3 DOF X/U = 0.282 [V]
ETMY T240 3 DOF Y/V = 0.096 [V]
ETMY T240 3 DOF Z/W = 0.149 [V]
ITMX T240 2 DOF X/U = 0.158 [V]
ITMX T240 2 DOF Y/V = 0.283 [V]
ITMX T240 2 DOF Z/W = 0.263 [V]
ITMX T240 3 DOF Y/V = 0.139 [V]
ITMX T240 3 DOF Z/W = 0.086 [V]
ITMY T240 1 DOF X/U = 0.07 [V]
ITMY T240 1 DOF Y/V = 0.147 [V]
ITMY T240 1 DOF Z/W = 0.021 [V]
ITMY T240 2 DOF X/U = 0.021 [V]
ITMY T240 2 DOF Y/V = 0.239 [V]
ITMY T240 2 DOF Z/W = 0.152 [V]
ITMY T240 3 DOF Y/V = 0.085 [V]
BS T240 1 DOF X/U = -0.107 [V]
BS T240 1 DOF Z/W = 0.123 [V]
BS T240 2 DOF X/U = -0.031 [V]
BS T240 2 DOF Y/V = 0.038 [V]
BS T240 2 DOF Z/W = -0.052 [V]
BS T240 3 DOF X/U = -0.222 [V]
BS T240 3 DOF Y/V = -0.289 [V]

Assessment complete.
Averaging Mass Centering channels for 10 [sec] ...

2026-01-05 08:58:27.267417
There are 2 STS proof masses out of range ( > 2.0 [V] )!
STS EY DOF X/U = -4.63 [V]
STS EY DOF Z/W = 2.377 [V]

All other proof masses are within range ( < 2.0 [V] ):
STS A DOF X/U = -0.492 [V]
STS A DOF Y/V = -0.851 [V]
STS A DOF Z/W = -0.499 [V]
STS B DOF X/U = 0.153 [V]
STS B DOF Y/V = 0.944 [V]
STS B DOF Z/W = -0.303 [V]
STS C DOF X/U = -0.867 [V]
STS C DOF Y/V = 0.801 [V]
STS C DOF Z/W = 0.594 [V]
STS EX DOF X/U = -0.218 [V]
STS EX DOF Y/V = -0.16 [V]
STS EX DOF Z/W = 0.036 [V]
STS EY DOF Y/V = 1.254 [V]
STS FC DOF X/U = 0.161 [V]
STS FC DOF Y/V = -1.157 [V]
STS FC DOF Z/W = 0.625 [V]
 

Need model restart in week of Jan 5th to correct JAC/IMC models

Jennie W, Dave B,

 

Jeff and I put in a bypass in the h1ascimc model (see alog #88465) so we could put in the simulink infrastructure to switch between using the PSL periscope PZT as part of the IMC control or as part of the JAC control.

At the moment the switch 'H1:ASC-IMCJAC_PZTOUTSW' is set to ON which should let the IMC servo use the PZT.

However the logic I put in will not switch the feedback to take inputs from the JAC servo if I turn the switch off.

This is because Choice 2 and 3 in the picture are set to pass their first input if the switch output is '>= 0', so whichever state it is in the IMC PZT output will be sent to the DAC.

I have changed these choices to >0 so that the top input (IMC PZT output signal) will be sent to the DAC if the switch is 1 and the bottom input (JAC PZT output signal) will be sent to the periscope otherwise.

I committed the changed /opt/rtcds/userapps/release/asc/h1/models/h1ascimc.mdl to the svn.

Wind fence patched for the end of the year

Last week we found that some of the hardware on the EY wind fence had broken, which meant some of the main support wires for the fence were dangling free, weakening the fence and possibly further damaging the scrim in any future storms. The main failures were in the all thread that goes through the posts and attach the wire anchor points to the post. We had a limited window today to go and try to patch the fence this morning, so that's what Randy, Mitch and I did. Forecast promised us some sun, but that never really materialized, so it was pretty chilly. Fence is patched up now, Randy and Mitch will return the lift to LEXC this afternoon, after everybody thaws out.