I added this shutter (shutter H1:SYS-MOTION_C_SHUTTER_M) to the main shutters screen at sitemap->LSC->Shutters. I also added a menu button that takes you to the control screen to the sitemap->IOO->JAC Overview screen, see pic.

We locked JAC with 1W input to find ghost beams. Details will come after we're done with the septum window reflection, but anyway here is the list:

1. EOM AR reflection. Properly dumped today.
2. L1 reflections (front and back surface) are reflected by JAC output coupler and go through L1. Properly dumped today.
3. L2 reflections (front and back). Properly dumped today.
4. L3 reflections (front and back). Properly dumped today.
5. EOM wrong pol forward going beam. Changed the beam dump position today. This was brighter than I thought, we will measure the power again.
6. JM2 transmission. Already dumped, confirmed it's still there.
7. JM3 transmission. Already dumped, confirmed it's still there.
8. Septum window reflection. This was coming back horizontally in -Y direction, was about half inch off from the main beam at the top periscope mirror, and hitting the metal part at the top edge of the bottom peri mirror. Not dumped yet. 
   • We'll have to improvise something so the beam is dumped at the top periscope position before entering into the periscope structure. Something like a variation of the beam dump behind the top mirror of the  JAC input periscope. 

None of the new beam dumps are interfering with the main beam and JAC refl/trans.

Jennie W, Ryan S

Summary: Ryan and I updated the JAC and IMC ASC models. We installed JM3 yesterday and so now the IMC cannot use the PSL PZT mirror as an alignment actuator. I have committed the changes to the svn but erik and dave will do some checks tomorrow before they commit to the revision locked version of the model and restart the DAQ. So changes are not 'live' yet.

The edits were made to h1ascimc.mdl which has top level blocks for IMC and JAC.

The JAC top level model sends signals directly to the PSL PZT mirror and these degrees of freedom are swapped as the PSL PZT basis P and Y are switched before input to the JAC due to the HAM1 input periscope.

I took out the feedback paths for PZT_P and PZT_Y that come out of the IMC block. The picture shows the old config and I have highlighted what I removed.

At the top level, IMC no longer sends signals to the PZT but instead to JM3. On the top level diagram, the signal JM3_P is sent via PCI cards to the channel "H1ASC-JM3_YAW_SUSHTTS" as pitch in the JAC basis is yaw in the IMC basis due to the HAM1 output periscope. The picture shows the old config and I have highlighted what I swapped.

The signal JM3_Y is sent via PCI cards to the channel "H1ASC-JM3_PIT_SUSHTTS" as yaw in the JAC basis is pitch in the IMC basis due to the HAM1 output periscope.

Within the IMC top names block I removed the output channels for the PZT from the WFS feedback path, we already had paths to feedback to JM3 within this path. The picture shows the new config.

I removed the PZT locking path from the LCKIN block and replaced it with one for JM3. The picture shows the new config. I am not sure we ever use this path (which is for dither asc control of the IMC) in the first place so maybe this was unneccessary.

I also removed the channels H1:IMC-PZT_YAW_OUT and H1:IMC-PZT_PIT_OUT from the DAQ channel list for the IMC model.

SUS JM3 (Tip Tilt) update - This afternoon I went into the HAM1 chamber (when no one was working with the beam) and re-touched the BOSEM flags to center it with the LED/PD for half light. I will re-take TF measurements later on.

TITLE: 02/19 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY: HAM1 work continued today
LOG:                                                                                                            

We refined the alignment from JAC to IMC by iterating small amount between JM2 and JM3. It was hard due to purge air and the suspended JM3, instead of relying on the IMC scan and minimize 1st order modes, we locked IMC and minimized the IMC REFL DC on average. After that the beam was still centered on JM3 well.

We closed the chamber and turned down the purge all the way and the alignment was indeed good. There was almost no 01 (PIT) mode power, 10 (YAW) mode power was less than 1% of 00 mode power, and the 20/02 mode power was 0.23 to 0.24%. See MM.png.

(To identify which mode is what, I intentionally misaligned JM3 in YAW (that causes PIT misalignment for IMC. See  mode_identification.png.)

J. Kissel

Executive Summary
Using 
   - the AxcelPhotonics butterfly diode laser,
   - the "beam splitter / near-field / bypass" measurement setup described in LHO:89123 to rapidly check the beam diameter at z = 0.991 [m] (near field) and z = 5.41 [m] (far field), 
   - elevating the beam height elevated to 5 [inches] to avoid any sort of clipping on other optomechanical setups on the table from other teams, and
   - loosening the lens position set screws only just barely, 
   - paired fiber collimators, in-vac feedthrus (with integrated patch cords), and ex-vac 7.5 m patch cables in-vac feedthrus 

      Beam Path   Char Date    Collimator   Feedthru (Pwr Transmission*)
      MEAS        2026-02-13   S0272503     S3228003 (100%)    
      REF         2026-02-17   S0272502     S3228002 (99%)    

      * Power transmission as reported from SWG:12296

I was "rapidly" tune the lens position, z_lens, for *both* the MEAS S0272503 and REF S0272502 fiber collimators to within 0.010998 (i.e. 11 [mm] - 2 [um]) with uncertainty of +/- 1 [um] , such that 

each fiber collimator sends out a free-space beam whose parameters meets SPI's requirements:
   - the desired waist radius (in both x/y dimensions) , w0 = 1.05 [mm], of within +/- 0.10 [mm], and
   - the desired waist position (in z), z0 = 0.0 [m] to within +/- 0.18 [m].

(where "rapidly" is in quotes: about 4 hours each from "install into measurement setup" and "I'm happy with a final full-position-vector scan). with no signs of strong astigmatism that I saw in the initial setup. (The later point confirms my suspicion that I was clipping on the EOM characterization setup, and there is *no* issue with the laser seed mode, polarization, or the beam splitters).

Support Media

The raw data from the beam profiles of each free-space beam are posted as
    2026-02-17_spi_fc_S0272502_ft_S3228002_7p5mPatchCord_AxcelPhotonicsLaser.txt
    2026-02-13_spi_fc_S0272503_ft_S3228003_7p5mPatchCord_AxcelPhotonicsLaser.txt

where the columns are jammt-friendly format of z Position [cm], Y waist radius [um], X waist radius [um]. 

Notes: 
    (1) as opposed to all previous data sets (e.g. LHO:89047, LHO:86350, LHO:84825) -- I added an additional measurement at z = 0.25 [m] to try to improve the accuracy of the fit beam.
    (2) X is "Axis 1" of the NanoScan parallel to the optical table, Y is "Axis 2," perpendicular to the table. As discussed in LHO:89099, jammt seems to import any three-column dataset such that the first column ends up fit as the "tangential w0," and the second column end up fit as the "w0." With a la mode, the data is typed in a matlab script manually, so X and Y data are modeled separately the entire time without rename, and thus kept consistent. Thus the intentional flip the X and Y axes in the text file such that a la mode and jammt are now both treating w0 = X = Axis 1 = parallel to table, and tangential w0 = Y = Axis 2 = perpendicular to the table.

I imported these beam profiles into both matlab (to run a la mode) and jammt to obtain waist radius, w0, and waist position, z0, fits to the AxcelPhotonics beam profiles, see attached plots:
    S0272502  a la mode  jammt
    S0272503  a la mode  jammt

Some pictures of the measurement setup with the NanoScan head at the new z = 0.25 [m] position (upstream of the beam splitter bypass):
    2026-02-13_FC_S0272503_S3228003_MeasSetup.jpg
    2026-02-17_FC_S0272502_S3228002_MeasSetup.jpg

Some pictures of the clean fiber collimator + vacuum feedthru systems packed up after measurement:
    2026-02-13_FC_S0272503_S3228003_PackedUp.jpg
    2026-02-17_FC_S0272502_S3228002_PackedUp.jpg

Detailed Analysis Results

Here's a table of the fit results from both a la mode and jammt. 


        

            

                
FC + FT S/N
Model
w0x [m]
z0x [m]
w0y [m]
z0y [m]
            
        
        

            

                
S0272502 + S3228002
a la mode
1.0392
-0.065196
1.0427
-0.020038
            
            

                
jammt
1.0392
-0.06521
1.0427
-0.02007
            
            

                
S0272503 + S3228003
a la mode
1.0396
+0.17704
1.0282
-0.030537
            
            

                
jammt
1.0396
+0.17702
1.0282
-0.03051
            
        
    
It's not a typo, the two fitting softwares agree to within the precision of the each display; +/- 10 [um] on both the waist radius and waist position.

From here on in this section, since I intentionally paired up fiber collimators and fiber feedthrus to match the last two digits of serial number, I'll refer to them as either "MEAS = S[...]03", or "REF = S[...]02".

From the table of fits, you see that the statement in the executive summary about the waist position, z0 = 0.0 +/- 0.18 [m], is defined expanded to cover the X axis waist position of MEAS = S[...]03 z0x = +0.177 [m]. But really, the other axis of the MEAS = S[...]03 FC+FT pair is at z0y = -0.031 [m], and the REF = S[...]02 FC+FT pair is within z0x = -0.065 [m], and the best z0y = -0.020 [m].
So the waist positions are really *quite* close to 0.0 [m]. 

Good. So let's use these numbers to do recast the fit (using jammt numbers only) into context:
    (1) Percent Difference between desired waist radius and final measured waist radius:

        REF, S[...]02 :: (w0x, w0y) = ([1.0392 1.0427] - 1.05) / 1.05
                                    = [-0.0102860  -0.0069524] 
                                    = [-1.0% -0.7%]
                    Within 1.050 +/- 0.1 [mm] = 1.050 [mm] +/- 9.5 [%] = [1.15 0.95] [mm]?
                    Both axes waist radius are a factor of 10x better than reqs.
        MEAS, S[...]03 :: (w0x, w0y) = ([1.0396 1.0282] - 1.05) / 1.05
                                     = [-0.0099048  -0.020762] 
                                     = [-1.0% -2.1%]
                    Within 1.050 +/- 0.1 [mm] = 1.050 [mm] +/- 9.5 [%] = [1.15 0.95] [mm]?
                    Both axes waist radius are a factor of 5x better than reqs.
        

     (2) Rayleigh Range:  

         (zR := pi * w0^2 / lambda)

         REF, S[...]02 :: (zRx,zRy) = (3.1886, 3.2102) [m]
         MEAS, S[...]03 :: (zRx,zRy) = (3.1911, 3.1215) [m]

         There's no requirement on where the Rayleigh range sits, but for a waist radius of w0 = 1.05 [mm], we would expect a Rayleigh Range of zR = 3.255 [m], and these values are at most z = -13 [cm] from that or 4% "short" of the target value. This doesn't really matter to SPI, as long as the Rayleigh Range is somewhere in between the ISIK breadboard and the ISIJ reflector 15.427 [m] away. The real requirement is the spot size at the ISIJ reflector, which we need to keep at the design value of 5 [mm] (whose value was determined with the original design waist radius of 1.05 [mm], and the acceptance that we didn't have enough room on the ISIK transceiver breadboard to install telescopic lens solutions to keep the spot size around 1 [mm] both within the transceiver *and* at the ISI reflector). 

      (3) Astigmatism: 

          A := (zRx - zRy) / (zRx + zRy)

          REF, S[...]02 = -0.003376 = -0.3%
          MEAS, S[...]03 = +0.011026 = +1.1% 

          Here, again, there's been no requirement on the astigmatism, but ~1% astigmatism doesn't smell too terrible. 

      (4) Spot size at 15.427 [m]: 

          w(z) = w0 * sqrt(1 + (z/zR)^2) 

          REF, S[...]02 :: (x,y) = (5124.569, 5155.038) [um]
          MEAS, S[...]03 :: (x,y) = (5194.496, 5075.909) [um]

          Recall the design value of waist radius at the ISIJ reflector, z = 15.427 [m], is w(z = 15.427) = 5 [mm]. As discussed in SWG:12273, that ADC noise with the large spot size is limiting the sensitivity of the pitch and yaw readout, as 

          dx/dTheta ~ sqrt(8/pi) L / w(z).
    
          But still, a 1.1% level of astigmatism -- which would result in a different sensitivity / noise performance between pitch and yaw, means that pitch is only ~2.1% worse than yaw.      

Great! We're good to go!

Or, rather, a better JM3 integration and PSL unintegration.

I made a temporary IMC_WFS_MASTER and IMC_WFS_OUTMATRIX_kk screen such that it's easy to route IMC WFS signal to JM3, not the PSL PZT, because I wanted something that works now.

However, right after I made what looks to be an OK screen, I realized that this doesn't work. PIT signal should be routed to JM3 YAW and vice versa. No fully-working IMC WFS until the next model update.

In addition, earlier today Daniel suggested to nuke PSL PZT from the IMC ASC (good idea).

If you want to revert back to the old medm, copy the backup

/opt/rtcds/userapps/trunk/asc/common/medm/imc/IMC_WFS_MASTER_BAK_20260218.adl 

to

/opt/rtcds/userapps/trunk/asc/common/medm/imc/IMC_WFS_MASTER.adl 

Wed Feb 18 10:12:42 2026 INFO: Fill completed in 12min 38secs

Gerardo confirmed a good fill curbside.

TITLE: 02/18 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: 0.02 μm/s
    Secondary useism: 0.44 μm/s 
QUICK SUMMARY:

More HAM1 work today

TITLE: 02/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: N/A
SHIFT SUMMARY: Busy day today! The HAM1 EOM was moved to it's final position this morning, JM3 was placed in position downstream of the JAC, and recovery of beam alignment into the IMC is ongoing. Cranes were worked on in the LVEA as well today.
LOG:

This morning we have pushed the JAC EOM by about 0.6mm (using ~25 thou thick washers) in -Y direction, following the finding of last Friday (alog 89158). 

After that the beam was good on the input side plate (the beam is offset in +Y direction by 0.1mm) and was OK on the output side plate (0.5mm offset in -Y direction).

The beam position on the crystal itself should be ~0.13mm in +Y direction on the input face and ~0.36mm in +Y direction on the output face. The angle between the nominal path and the actual path outside of the crystal is about 0.6 degrees. See pictures and cartoon.

Calculation depends on the refractive index, I assumed n~1+deflection/wedge=1+2.35/2.85~1.85, but using 1.85+-0.5 instead won't change anything in a meaningful manner.

This is acceptable, the beam is more than 1.5mm away from the side face of the crystal, cannot remember the beam radius but it should be smaller than 600um if FDR is still valid, so it might be 2.5 beam radius or maybe more.

FAMIS 39953

Starting about two weeks ago, the pressure at the EX station started getting more "noisy" for some reason. Not sure why this would happen or how significant it is, but noting it here just in case.

Jennie W, Ryan S, Keita K

Summary: MC suspensions back to good time from 10th of Feb, we should only lock the IMC length loop manually during this installation period to avoid the WFS engaging.

Today Ryan and I had the task of figuring out why the IMC suspensions seemed to be badly aligned on Friday.

We found a good reference time 16:48:29 UTC on Tuesday 10th Feb at the end of the period where Olli, Jenne and I set the IMC axis back to its nominal state before the vent using ASC loops for DOF 1 and 2 of the IMC plus manual moves of the JM3 mirror in chamber as this cannot be moved by an ASC loop as it is not a tip-tilt currently. See photo of the WFS and MC mirror top mass OSEMS here. Note it is important to choose a time when IMC is in the locked state as the MC2 mirror gets mis-aligned when the IMC guardian is offline.

We figured out that the alignment was changed about 19:33:17 UTC on 13th Feb probably by the IMC guardian as Elenna used it to lock the IMC for phase check measurements. See photo, where the vertical cursors are set at the good reference time and today.

After some investigation of the guardian we reminded ourselves that DOFs 3-5 are turned off in the IMC WFS MASTER filter banks. DOF4 and 5 are normally off and DOF3 is intentionally left off because of the replacement of PSL PZT actuator by JM3.

When the IMC guardian is used to lock it automatically triggers the WFS through some logic from the simulink model, and so when Elenna used the guardian to lock it turned on the feedback to DOFs 1 and 2.

Until we install the JM3 tip-tilt and are finsihed most commissioning of the HAM1 hardware we should only lock the IMC manually by engaging the MC-L servo using the common mode servo board controls.

Keita and I zeroed the M1 LOCK fiters for all 3 MC mirrors and I changed the alignment sliders so the M1 osems were back to their values from the reference time on the 10th. See photo of ndscope.

Dave, Oli, Marc, Fil, Rahul

This morning I switched PM1 (Tip Tilt suspension) in HAM1 chamber from safe state to damped state and immediately the DAC output was saturating. I suspected purge air (which Travis turned it down twice during the day) and later Masayuki also covered PM1 with foil. However, nothing stopped the suspension from saturating.

Then Oli, Dave and I did a model restart and later I power cycled the Satamps for PM1 in the LVEA - nothing helped.

Next, Marc, Fil and I went to the LVEA (checked the satsamp, which was fine) and CER and found the Coil Drivers to be faulty.

New Coil driver - E2400048 s/n 22001180

Old Coil Driver - E2100430 s/n S1106046

SUS PM1 is now not saturating. I will perform the heath checks later on.