TITLE: 02/25 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: N/A
SHIFT SUMMARY: Another productive day working towards closing out HAM1.
LOG:

Alignment into HAM2

Locked JAC with RF at 1W. IMC WFS was centered in IOT2L and IMC started working. As we steered JM3 MC2 TRANS responded as expected (i.e. JM3 PIT -> MC2 YAW and vice versa though there's a significant cross coupling). Sheila had to recenter the WFS once again at some point as the WFS started to get off-centered as we turned JM3, but as far as the WFSs were centered, things worked.

In the end, MC2 TRANS was centered reasonably well (right before the cursor in the attached), JM3 DAC output was O(1e7) while a 28 bit DAC's range is +-134e6.

Apparently we made the last step of JM3 PIT adjustment in the wrong direction at the time (we didn't notice because the WFS is very slow) and overshot. I steered it back later, now H1:SUS-JM3_M1_OPTICALIGN_P_OFFSET is -39 instead of -19 (second screen shot).

Anyway, this means that the alignment into HAM2 is good with more than a comfortable range left for JM3. No need to further refine.

One caveat is that the IM4 trans is totally off in PIT. But that's a downstream problem which we'll have to deal with later in HAM2. That should not prevent us from moving forward to close down the chamber.

The tasks listed below are described in different alogs.

JAC TRANS PD calibration

Last beam dump (alog 89249)

ALS beam path check

It seems that whitening gains of some corner station QPDs were somehow set to zero on Friday Feb/20 17:22 UTC (09:22 PST).

Not sure why this happened, this seems to be earlier than the failed effort to update h1imcasc model (alog 89208). ALS QPDs, end station QPDs and all WFS RFs are good. Was something done to Beckhoff that day? 

I first noticed this for MC2 trans yesterday because it was interfering with IMC locking and WFS triggering. I checked all QPDs and WFS today and found that the following channels were affected. I restored them all to the value right before it was set to zero. 

Tue Feb 24 10:14:58 2026 INFO: Fill completed in 14min 54secs

Bypass will expire:
Tue Feb 24 11:57:58 AM PST 2026
For channel(s):
    H0:FMC-CS_FIRE_PUMP_1
    H0:FMC-CS_FIRE_PUMP_2
 

TITLE: 02/24 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: 3mph Gusts, 1mph 3min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.29 μm/s 
QUICK SUMMARY: In the homestretch on HAM1 alignment activities and JAC commissioning, which continues on this rainy morning.

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

02/23 S. Muusse, C. Compton, G. Vajente, S.Goswami, B. Wu 

The electronics chassis was brought into the lab today (thanks Phil and Dave) and we began testing the integration of the optomechanics with the CDS. An ethernet cable was run into the JOAT CHETA lab to connect to the server.  A variable power supply was brought into the lab to power the chassis at the required 24V along with a linear power supply required for the rotation stage and translation stages. 
The flipper I/O input and output had to be configured for Beckhoff communications using this guide.
The current status of our testing is as follows:
Working:

• Flipper
• PD
• Power meter

Not working:

• Rotation mount 

Untested:

• Translation stage

We have realised during this process that the flipper isn't powered by the SMA connectors and requires a seperate power source. This was not considered in the initial panel design and is not currently supplied by the chassis. There is a spare blank connector input/output slot which can be used. 

We have begun making the medm display for the CHETA system based on the current CO2 medm which shares many optomechanical systems. CHETA isn't currently on the TCS screen so to run the medm display currently the following command must be run to access the work in progress. 

medm -x -macro 'USERAPPS=/opt/rtcds/userapps/release/,SITE=LHO,site=lho,IFO=H1,ifo=h1,OPTIC=X,OPTICF=ITMX,name=AWCITMX,RT_MEDM=/opt/rtcds/lho/h1/medm' TCS_CHETA.adl 

To open the medm in a configurable format:
 medm TCS_CHETA.adl 
Alternatively to edit the code files:
code medm TCS_CHETA.adl 

Further alignment on the ITMY table was completed with almost all optics now mounted on the table. 

We installed JM1, balanced it and aligned it. A beam dump was placed behind it though we could not see the transmission with 1W input.

After this, JAC locked with RF without any problem though the input was wobbly when the purge was up.

We searched for unexpected ghost beams (also with 1W input) and didn't find any.

We uninstalled many (but not all) temporary dog clamps and irises.

We revisited the IMC alignment because it's been off in PIT since Thursday or Friday. We locked JAC using dither (because we wanted to turn down the purge air). We enabled the IMC WFS just for MC optics and steered JM3, but weren't able to center the MC2 trans. Steering JM3 just made the IMC transmission worse while making not much impact on the desired degree of freedon (JM3 PIT -> MC2 trans YAW, JAM3 YAW -> MC2 trans PIT).

Tomorrow, we'll revisit the IMC alignment. We'll also measure the power coming into JAC TRANS PD as well as the actual transmission of JAC while locking it with RF so we can use JAC trans PD as the measure of the power into HAM1.

Today, Gerardo replaced the annulus ion pump body for the GV6 annulus system.  He then handed off to me to hook up the turbo/aux. cart.  The pressure at the cart was ~3e-5 after 4 hours of pumping.  

There will be a pump cart running at GV6, at the Y-arm termination slab, until the ion pump transition pressure.

TITLE: 02/24 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: N/A
SHIFT SUMMARY: Another productive day with work continuing in HAM1; JM1 is in place and more alignment ongoing.
LOG:

WP13034

Fil, Dave, Daniel, Jonathan, Patrick, Sophie, Camilla,

Last week Fil and Daniel powered up the Cheta slow controls Beckhoff chassis in the MSR. It was sitting on a cart behind MSR02, connected to the MSR Chassis AUX-1 ethernet port with a short cat6 cable. Daniel added the AWS system to the SYS ECAT TCS CS PLC.

Today we moved the Cheta chassis into the Vacuum Prep Lab. It ethernt connection to the MSR chassis is now quite convoluted, a drawing can be found in D2600049

From the Cheta chassis the path is: cat6 cable to the wall RJ45 jack, building wiring connects this to the RJ45 patch panel in Room 163. Fil ran a cat6 cable from the patch, under the 163 floor, through a wall penetration to the CUR underfloor, then up to the wall mounted CUR CDS switch. This switch is connected to the MSR core switch, which in turn is connected to the FE switch in MSR04. A cat6 cable from this switch over to the Beckhoff chassis completes the link.

The link was tested in two stages. After Jonathan configured the core switch and the two edge switches to create a private VLAN connecting the switches, Fil moved the chassis into the CUR and connected it to the sw-cur-aux-stk port 1/1/7. I ran the above rack cat6 in the MSR from sw-msr-h1fe-stk 2/1/2 to the MSR chassis.

When powered down in the MSR DEV0 system went into a bad state. The H1:SYS_ETHERCAT_DEVICE_0_LOSTQUEUEDFRAMES channel (normally zero) accrued thousands of frames. The LOSTFRAMES (normally zero) became 13, the SLAVECOUNTACTUAL (normally 19) became zero.

When powered back up in the CUR, DEV0 status went green, the slave count went back to 19. The frame countered latched at their non-zero values. After Patrick reset them they stayed at zero.

Next Fil moved the chassis into the Vacuum Prep Lab, everything went green again and the frame counters stayed zero after reset.

FAMIS 31126

Not much to report this week. FSS has been on and off due to JAC installation and commissioning.

Picket Fence earthquake early warning system can't connect to station "UO_TOOM:HHZ", so we're only monitoring on four out of five stations.

Mon Feb 23 10:12:14 2026 INFO: Fill completed in 12min 10secs

Jennie W, Keita K, Rahul K, Ryan S,

This morning Keita turned the power up to 1 W and the purge air down in order to scan the OMC and measure the modulation index.

We had some work to do to lock the JAC, the cavity wouldn't scan properly when managed by the guardian code.

Ryan and I have looked back at it and think there may be something wrong with the feedback to the PZT. It can't be the PZT itself though, because Keita and I were able to lock on the TRANS PD signal with the dither locking done manually by tuning the PZT offset to find the resonance and then turning on the feedback.

I have enclosed a picture to aid problem solving next week.

We then had problems keeping the IMC locked so Keita had to change the threshold used to check if the cavity is locked down to 2. This was changed at line 133 in ISC_library.py at userapps/h1/isc/guardian/.

trans_pd_lock_threshold = 2

We then managed to do three scans,

one with 45 MHz off, one with both on, and one with 9 MHz off. Detailed analysis in progress.

After turning the power back down Keita and Rahul swapped the mirror we currently have in front of the TRANS PD, with the uncoated laser window that is meant to be there (JACT_BS1).

They had to top gun and swab it to remove two dust particles first.

This replacement means the power to the PD is lower and so we needed to power up to 1W to check this alignment.

I have left the mirror we took out on the table on the -Y side labelled as 'HR mirror taken out of JACT-BS1'. Need to check which exact mirror this is with Masayuki on Monday.

Keita locked the cavity manually with the REFL PD and optimised the amount of light falling onto the TRANS PD.

I powered down to 100mW and de-energised the rotation stage and closed the light pipe at the end of the day. We also had the rotation stage de-energised and locked out when we were working in chamber.

Modulation index measurement for 45M and 9M, they're healthy.

1W into JAC, no WFS for IMC, ITMY single bounce. Scanned OMC with both 45MHz minimal power (~4dBm) and 9MHz full (~27dBm), then both in full power, then only 45MHz in full (see screen shot).

Jennie will post the modulation index later, but the peaks look healthy to me.

The alignment into IMC was rather off in PIT and the guardian had a hard time locking IMC (I changed the lock threshold in the guardian). We didn't move MC, didn't bother to do any thorough investigation, but either JAC or MC mirrors moved. Maybe we have to lock IMC, use WFS for MC, and steer JM3 and see if the MC mirrors will be driven far from where they are. If they are we might have to touch up in-chamber alignment again.

JAC TRANS BS was swapped with the real one (laser window with AR only on one surface).

We replaced the JAC TRANS BS (which was a temporary high reflector until today) with the real one that is just a bare glass (the reflectivity is 7% or so depending on AOI). 

We locked JAC with RF, was able to see the beam coming to the TRANS PD but wasn't able to see the reflection of PD, so we raised the power to 1W.

Initially the beam was missing the PD because the new optic is thinner than the temporary one. We realigned the optic to steer the beam back to PD. Since we could not directly see the PD surface, we just steered the beam up and down, left and right until the PD output starts to drop, and put the beam roughly in the middle.

We were able to see the PD reflection using an IR card and an IR viewer. There were two reflection blobs (which was the case before, too),  and I moved the JAC TRANS BD in +X direction by 1/4~3/8" to catch both.