TITLE: 06/10 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
OUTGOING OPERATOR: None
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 8mph Gusts, 4mph 3min avg
    Primary useism: 0.10 μm/s
    Secondary useism: 0.13 μm/s 
QUICK SUMMARY:
Some of the work that may be attempted today.:
Corner Station vacuum chamber is still open. 
Beam splitter team is still working on First contacting the Beam splitter.
Faro team is still faroing near HAM3 and BSC2.
Ground loop checks will happen.

SPI team is still working on their install and may request Laz Haz in the afternoon.

CDS overview screen has red indicators:
H1EDC is red and has the following channels with errors: 
H1:HPI-PUMP_CS_DIFF_PRESS_PUMP_CTRL_SETPT_HIGH
H1:HPI-PUMP_CS_DIFF_PRESS_PUMP_CTRL_SETPT_LOW
H1:HPI-PUMP_CS_DIFF_PRESS_PUMP_CTRL_SETPT_OOR
This may be due to Jim and crew not being done with SEI  adjustments.

GRB-SHORT  E639712

Summary

Whatever happened to IM1, Rahul did make it better again. Reasons for improvement is unknown but we proceeded with the alignment and we're mostly done.

There is a mystery scattering or maybe clipping somewhere close to the IFI output but not on the output baffle nor DKDP baffle. It could be a scatter from the CWP surface, or a ghost beam somewhere, or something else. It will take a LONG time to diagnose this, and quite likely this existed for a long time. I'm tempted to leave it at this time. But I'll try to take some more pictures.

There's also something weird about the 1st pico mirror PIT actuator for ISS array.

We'd still like to take pictures/measurements here and there on Tuesday.

Done: ASC REFL centering

Following the morning work (alog 90525), REFL ASC censors were centered using RM1 and RM2. About ~30% of DAC range was used for RM2 (RMs_happy_again.png). FYI, using flash peak, [P,Y]=[-0.003, 0.015] for REFL_A and [-0.020, 0.001] for REFL_B. (Doesn't matter how close these are to zero as far as they're within +-0.1 or so and the SUM is decent, but it feels better to be able to get close to zero.)

Done: ISS array centering

Then we looked at the ISS array and the QPD was not centered. A quick adjustment of the second pico that is closer to the array was all it needed (keita_ISS_happy1.png). [P, Y]=[-0.03, 0.05].

Done: IFO REFL baffle (HA13) adjustment

We looked at the IFO REFL baffle (HA13) in front of the HAM2-HAM3 septum window and it was too high even though it was not clipping, so we lowered it by a couple mm. Before: lower edge height = 105.5mm; upper edge = 206.8mm. After: lower edge = 103.6mm; upper edge = 204.5mm.

This baffle was already moved by a couple mm in +Y direction last week (because the beam was closer to +Y edge). See  IFOREFL_baffle_before_relocation.jpg and IFOREFL_baffle_after_relocation.jpg though it might be difficult to see the difference from this picture.

IFO REFL beam looked like IFOREFL_HA13_baffle_after.mov after the height adjustment.

Mystery flashes seen inside IFI output baffle aperture

We proceeded to check the IFI output baffle and I was bothered to find that something that looked like clipping was visible close to the left edge of the baffle using the IR camera. See IFI_OUT_clipped_720p.mov, this is a view from +Y door. But this was less frequent than the flashing itself. In a retrospect, this was probably the reflection from the PRM when the beam was swinging to the left of the video, but anyway we did various things:   

• We got suspicious about PRM somehow misaligned, checked it on the retroreflection check iris but it was fine in YAW (it was off in PIT so changed PIT offset from -1185 to -1115, not sure if it was PRM that changed or something else, but the important thing was that it wasn't off in YAW and that this is not something that I worry about now that we have a decent headroom for RM2 DAC).
• We closed the HAM3 door cover (which did quiet down the beam motion a lot) as well as the HAM2 -Y door cover. I used IR viewer and thought that nothing changed at the time. The bright thing didn't disappear after blocking the beam between PRM and IM4, again using the IR viewer, I thought.
• However, revieweing videos shot later, I haven't found anything to the left of the output baffle after the beam motion was reduced by closing unnecessary open door covers. But that revealed the next issue.

See IFI_out_another_view.mov, this is after the beam quieted down enough and after PRM PIT was changed. The bright thing at the left side of the baffle hole is not visible any more, but you can still see bright-ish scattering of some sort inside the baffle aperture which was there even when Rahul blocked the beam between PRM and IM4. IFI_out_another_view.jpg shows the same thing but with more useful exposure. This is concerning.

DKDP baffle behind the IFI output cwp baffle looked OK (IFI_DKDP_baffle.mp4). BTW, as was reported before, it looked to us that the IFI output baffle has an offset in -X+Y direction relative to DKDP. In the video, the beam on DKDP is slightly biased to the right on average because we tried to split the difference between two baffles.

We moved IM1 in YAW by +-200urad while observing the IFI output by IR viewer to see if there is a better beam position on IFI output. It seemed to me that actually we don't have much space here.

Look at IFI.png to see how the beam is routed through DKDP, output CWP and then passes by the parking beam dump pick-off.   

• If we give negative 200urad for IM1 YAW, the forward-going beam starts to interfere with the parking beam dump pick-off once in a while and the frosted barrel of that pick-off becomes bright. This is despite that the beam looks perfectly fine when IM1 is at the now-nominal position (see parkingBD_pickoff.mov, negative 200urad IM1 rotation would mean that the beam will be like 1mm to the right in this video).
• If we give positive 200urad for IM1 YAW, I thought that +X side of the IFI output cwp baffle starts to get brighter once in a while (my theory is that this is the same thing as shown in IFI_OUT_clipped_720p.mov where the edge of the baffle clips the back-propagating beam when the beam moves too much).

We'll be better once we're in vacuum because things will be quieter and the MC alignment will be better, so no beam motion and no HOM transmission, but I have to say that the clearance here looks to be unnecessarily narrow. I will NOT touch IFI itself so the only option for mitigation will be to move the parking BD pickoff, but it will be tedious to align that pickoff to steer the beam into the beam dump on top of HAM2. Given the limited time available I'll leave it as is.

We don't know what this scattering is, maybe it's the AR reflection of CWP or DKDP hitting something, maybe it's the surface scatter of CWP. I'll try to take the video from the back of the IFI output beamdump/CWP using a big inspection mirror.

Done: IM4 TRANS centering.

Rahul used pico mirror to roughly center IM4 TRANS while I was monitoring individual segments. IM4TRANS_ROUGHLY_BALANCED.png

Done: IM4 baffle (HA12) moved

As planned. The beam originally was offset in +X direction (IM4_HA12_before.jpeg shows the original location, IM4_baffle_HA12_before.mov shows the beam position), IM4 baffle was moved a bit in -X direction (IM4_HA12_after.jpg, IM4_baffle_HA12_after.mov).

Done but not really: Picturing the picos, one concern for the first ISS pico actuator.

J. Freed, J. Kissel, J. Wright, T. Sadecki

Today was the first day of ISIK Install. ISIK IS NOW IN CHAMBER!!!! Detailed notes for the install are located here

Removed the last cable clamp of the old feedthrough from the -x -y corner. Feedthrough hole covered with foil in prep to install new feedthrough tomorrow which will include the fibre routing and existing ISI cabling.

In order we did:

• Removed ISI ballast mass
• Install installation cylinders
• Install ISIK transceiver 
• Remove ISIK Handles
• Remove installation cylinders.
• Install ISIK shroud brackets.
• Routed picomotor and photodiode cables to +y -x corner in prep to connect to that feedthrough.

NB we might have to realign M_B1 and R_B2 as these mounts were bumped in install

We tried to diagnose the scattering or clipping or whatever that is visible inside the IFI output baffle aperture (alog 90536, especiall this video from that alog). It's not subtle, is always there even when the beam is blocked between PRM and IM4, and it's not just once in a while, it looks to be as frequent as strong flashes from IMC.

This is not the clipping of the forward propagating beam on the baffle as the beam height is pretty good (beamheight_dkdp_baffle.mp4) and YAW is also OK on dkdp baffle as well as IFI output baffle (dkdp_baffle_yaw.mp4, IFI_output_yaw.mp4).

We took a video of the back (i.e. -Y) side of the IFI output baffle through the output CWP by inserting a big dentist mirror between DKDP baffle and CWP and shooting from the +Y side. Video will be posted later (the raw video from IR sensitive camera exceeds 15Mb limit of alog and I don't have a good editor on my laptop).

Anyway, it seems like something is maybe hitting the bottom edge of the baffle from the back, Disha and Rahul think that there's something at the top too but I'm not sure.

We don't know what it is but we've done everything that could be done in situ without resorting to drastic measures (like temporarily removing all suspension baffles that block our view, which takes time despite that we don't know if that helps or not, or moving IFI to the lab which I won't do at this point in time). Since I'm pretty sure that this is NOT the clipping of the main beam as was noted above, my recommendation is to give it up at this point and move on, knowing that this thing does exist.

Together with alog 90536, we're done with HAM1/2/3 alignment today. Let's hope that the IM1 mystery motion won't return.

Fil already started ground check of suspensions, we'll do the ISS unit and the QPDs in HAM2/3 tomorrow.

Sheila, Camilla, Begum, Ryan Short

Summary: Beam is aligned to filter cavity, and through SFI1 + SFI2, with only a couple of % loss.  We are clipping on B:L2 apperture, which we plan to remove tomorow.  

This morning Camilla and I worked on the alignment from the VIP to the filter cavity.  We started by looking at the centering on the A:L2 aperture, which Begum and Camilla adjusted yesterday using a power meter downstream (90528).  To me the beam looked a bit high on this aperture, but we have seen in the past that looking at the aperture isn't a good way to judge the centering and it is best to rely on the power meter, so we've left A:M1 and A:M2 as they were we plan to leave them this way. 

We adjusted A:M3 to center the beam on FC1, then walked ZM3 sliders to get the beam retro reflected in return off ZM1.  Camilla moved ZM3 off in pitch so we could better judge yaw, then off in yaw so we could better judge pitch.  This gave us a beam in transmission of SFI1, we adjusted  B:M1 to clear the aperture attached to B:L2, and to bring us close to centered on the SFI2 aperture.  The beam looks good in pitch on the B:L2 aperture but slightly to the -X side of the aperture, not enough to be concerned about clipping.  We also adjusted B:M2 and B:M4 to get the beam transmitted through SFI2 and the ZM4 iris, but it is clipping on the B:L2 aperture.  (Labeled cartoon)  We can see that the beam makes it through the SQZT7 iris and to the SQZT7 IR PD, but it is quite low on the first iris.   This afternoon we reset the positions of the irises in front of ZM3 and ZM1 to center on this new alignment which we believe is correctly retro-reflecting off the filter cavity, screenshot of these slider positions is attached.  

We made an attempt to use a non-magnetic allen key to remove the retaining ring for the apperture on B:L2, but ring is too tight for us to remove it from the akward angle.  We think that we will have to pull it out of the chamber so we have space to use the correct tool for the retaining ring.  

This afternoon, Ryan Short, Begum and I went back and tried to make some beam profile measurements of the beam returning off FC1 by inserting a beam splitter.  We ultimately weren't able to find a spot to place the beam splitter and phasics camera where the beam was the right size without blocking either the OPO reflected beam or the path to FC1.  

We did take 6 measurements with the phasics camera of the beam reflected off ZM1 towards the filter cavity, with the translation stage lens in 3 different positions at two different camera locations.

With most of the payload placed on the cartridge now (Betsy and Travis added stays inside yesterday, Mitch, Randy and I added keel masses around the same time) we were able to put load on BSC2 HEPI springs, unlock and float the cartridge. We started with putting 90% of the original load (numbers I recorded before disconnecting actuators) then adding load to the springs on each pier until dial indicators showed vertical movement and vertical stops could be retracted without disturbing the Z position at the dial indicator. We then tried to move to correct the error Jason and Ryan measured with the Faro yesterday, using the dial indicators. Ran into a few hiccups, stops on the backs of the piers got missed when unlocking and were quite difficult to reach, the front stop plate on one of the piers started colliding with the foot and had to be repositioned. I think we are close to the position idicated by IAS, about +2.5mm X and +.5mm Y from our starting position this morning but dial indicators can be fickle and easily disturbed. Next step is to see what the Faro says tomorrow morning, and we will probably also try to assess the level using an auto level on the keel, but I'm a little skeptical of that measurement.

TITLE: 06/09 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: None
SHIFT SUMMARY:

With ISS alignment progress, able to let SPI work start, transition the LVEA to SAFE to allow BSC2 HEPI spring work to start.  HAM7 in-chamber work continued (in a bifurcated laser hazard state).  CRS work in the optics lab and CRS Lab.

LOG:

• Before1430-1547 Technical cleaning and supply checks in the lvea (kim)
  • 1626-1749 Back to LVEA (kim)
• 1501- ~1630 LN2 truck (Pacific CA Systems) arrives & goes to CP2 Dewar
• 1518 Testing out new Reservation System on nuc30--to help prevent crashes (tj)
  • ~1605 Crashed & had permission issues; tj notified.
  • ~1715 About when ReservationSystem returned to service
• 1530 Pest control person had issues with gate, so I opended for them
• 1532-1927 First Contact pour begins (ibrahim.anamaria)
  • 1555-1751 Betsy joining,
  • 1636 ryanS joining
  • 1744 anamaria out for a break & went back in
• 1539-1836 Taking photos out at HAM2 (keita.rahul); 1632 disha joins
  • 1836 out; seeing flashing from Faraday and would like to talk to sheila about it.
• 1641-1750 Sitewide FAMIS maintenance (chris)
  • 1750-1819 LVEA FAMIS checks (chris)
• 1647-1707 Moving a box in West Bay (randy)
• 1657-1925 HAM7 in-chamber (camilla.sheila)
• 1659-1940 Setting up FARO @HAM3 for BSC2 (jason.ryanC)
• 1725-1740 Grabbing wrench from CRS lab (jim)
• 1726 checking HEPI at Mechanical Room + MY for parts (fil)
• 1735-1914 lvea tour (thomasR)
• 1740-1801 turning off turbo @EY (jordan)
• 1745-1929 CRS work (alexandra)
• 1748-1940 Set-up for BSC2 HEPI (jim,mitch)
• 1748 3ifo checks at LVEA + mids (tyler)
• 1805 LSB then quick Staging stop & then off to MY (kim)
• 1805-1929 CRS work (Shoshonna)
• 1815-1927 Back to ITMy First Contact pour (anamaria)
• 1825-1907 Corner HEPI Pump Station work (patrick, fil)
• 1915 OAF DAC (used by PEM) getting checked out (dave, erik)
  • 2315 Marc joining erik @cer
• 1955 SPI Install at HAM3 (jeff.jennie.josh)
• 2008-2025 Transition LVEA to SAFE (richard.betsy.keita)
• 2031 cleaning CRS optics in optics lab (alexandra.shoshonna)
• 2032 showing randy work in lvea (jim)
• 2033-2323 BSC2 HEPI + FARO work (jim.mitch. jason.ryanC)
  • 2135-2253 tony joining
  • 2252 ibrahim joining
• 2036-2116 HAM3 feedthru check (travis)
• 2045 HAM2 clean-up (keita)
• 2054 HAM7 in-chamber work (sheila.ryanS.begum)
• 2100-2225 clean-up for BSC1 first contact (anamaria.ibrahim)
• 2121-2155 Visitor from APS getting a tour from Jenne+Mike
• 2144-2159 handing part off to jim in lvea (randy)
• 2214-2224 Checking on teams in lvea (betsy)
• 2312 ground loop checks for HAM2 at the rack (fil)
  • 2313 HAM2 SUS were taken to SAFE (from ALIGNED)

I wrap/bagged/tagged all of the stuff still out in the West Bay Cartridge cleanroom and we turned it off.  I also unplugged the garb room.

No more need to stock that area.  

We will move the bags and finish cleanup after the vent.

Ibrahim, Ryan, Betsy, Anamaria

This morning we poured the first contact onto ITMY. All went well. We had 3 minor drops at the bottom, but they dried fast and didn't continue leaking. We finished pouring about 09:35, took some 10 min. We then kept pushing the pico motors until the level stopped changing and the picos started to bottom out. 

It took us a bit to get the camera setup with reasonable lighting, so for next time: we should turn off the illuminator from the getgo and set up a tripod just for light, next to the camera. (Because of the CP, we are looking through 3 surfaces to see the HR of the test mass so it's quite hard to not have all the reflections cover what we really want to monitor.)

J. Kissel

Upon carefully reviewing the results of the BnK hammering (LHO:90493) of the SPI Pathfinder's HAM2 ISIJ Reflector's Shroud (D2500030 on the assembly D240010-v6) I've decided to remove the ISIJ shroud from the assembly for now. (Honestly, I made the decision to remove it right after hearing it; LHO:90544, but my desicion was supported by the BnK results).

Here's why:
    - The resonances are high-Q and below the required 150 Hz. Thus, if left as is, its frequency response would likely impact the force-to-displacement transfer function of the ISI, and limit the band-width of the ISI feedback control loops.
    - The argument the SPI team came up with for this shroud serving any "prevent scattered light into / from the SPI" purpose is weak, given that the very small solid-angle of possible reflection of 1064 [nm] light into/out the SPI system or the main IFO system (we guess that the tube would need to be ~meters long; but we haven't done any quantitative calculation).
    - The SLIC team has already looked at the HAM2 and HAM3 system enough to decide that carving out some portion of a circle on the existing, middle ISI table panel above the ISIJ reflector works for them. Similarly on the other end in HAM3 over the ISIK transceiver, the panel collection is enough. I hope they've done a what quantitative estimate they can; it's likely way more that the SPI team was capable of.
    - The arguments for this should as an "in-chamber work" protection mechanism is weak: Rarely (as in once every 5-to-10 years) do any humans find themselves *in* the mode-cleaner beam tube, +X of the HAM2 ISI, and it's with great intent. In addition, the ISIJ reflector assembly doesn't protrude that much that one's appendage would "get caught" on it. Finally, even if contacted, it's a very robust assembly. You'd need to soccer-punt it to move anything, and it's more likely you'd destroy your foot/shin than even cause an alignment shift in the components.
    - At least upon first attempt at path-finding, we want to minimize any use of damping material like viton to prevent any unwanted drift. But even if we damped the resonance, there would still remain a resonance, just lower Q, thus it might still be bad for the HAM2 ISI loops. 

Eventually, we want to re-design this shroud to, say, add an end-cap. And eventually we can easily can hose-clamp a bit of viton like we've done for the, say, the ISI's GS13 vacuum cans.
We'll do that ... next time, if at all.

The EndX BRS was stuck in a damping loop (I'm assuming caused by the power outage). Usually when this happens increasing the damping thresholds temperately fixes the issue, so we went ahead and did that.
It seems to only be effecting the ETMX BRS, so we left the ETMY one alone
Jim and I increased the damping thresholds from:
H1:ISI-GND_BRS_ETMX_HIGHTHRESHOLD: 2000-->4000
H1:ISI-GND_BRS_ETMX_LOWTHRESHOLD: 800-->2000

It also looks like the ETMX BRS drifted out of range (maybe due to the heater losing power and not returning to the original level?) so I've increased the voltage going to the heating plates and will check back in tomorrow to see if it's been restored

J. Kissel

In prep for the eminent install and alignment of the SPI pathfinder, I've added and turned on calibration to convert all PD signals (which come off the ADC as [ADC counts]) into ADC input voltage, like we've been using on the o-scopes in the optics lab.

The "filter," really just a gain is
    Module    Name     Design String     Units
    FM1       cts2V    gain(0.0061035)   [(ADC V) / (ADC ct)]
as the ADC has a 40 [V_pp] (differential) range, spread over 2^16 [ADC ct], hence 40 / 2^16 = 0.00061035156, which I've rounded to 4 significant digits as is typical (see T1100538). 

This FM1 module has been copied and loaded into every relevant PD input filter bank, the module is turned ON, and the gain of the bank has been set to +1.0 such that the output of the bank is calibrated. Those calibrated channels (in the order they appear off of the ADC; LHO:89775) are: 
    IFO REF A      ::   H1:SPI-H23_IFO_REF_A_DEMOD_SIG_OUT_DQ    ::  2^15 (32768, or "32k")
    IFO REF B      ::   H1:SPI-H23_IFO_REF_B_DEMOD_SIG_OUT_DQ    ::  2^15 (32768, or "32k")
    IFO MEAS A     ::   H1:SPI-H23_IFO_MEAS_A_DEMOD_SIG_OUT_DQ   ::  2^15 (32768, or "32k")
    IFO MEAS B     ::   H1:SPI-H23_IFO_MEAS_B_DEMOD_SIG_OUT_DQ   ::  2^15 (32768, or "32k")
    
    QPD B SEG 1    ::   H1:SPI-H23_OL_QPD_B_SEG1_OUT_DQ          ::  2^11 (2048, or "2k")
    QPD B SEG 2    ::   H1:SPI-H23_OL_QPD_B_SEG2_OUT_DQ          ::  2^11 (2048, or "2k")
    QPD B SEG 3    ::   H1:SPI-H23_OL_QPD_B_SEG3_OUT_DQ          ::  2^11 (2048, or "2k")
    QPD B SEG 4    ::   H1:SPI-H23_OL_QPD_B_SEG4_OUT_DQ          ::  2^11 (2048, or "2k")

    FBR PWRIN REF  ::   H1:SPI-H23_FBR_PWRIN_REF_OUT_DQ          ::  2^11 (2048, or "2k")
    FBR PWRIN MEAS ::   H1:SPI-H23_MEAS_PWRIN_REF_OUT_DQ         ::  2^11 (2048, or "2k")

    QPD A SEG 1    ::   H1:SPI-H23_OL_QPD_A_SEG1_OUT_DQ          ::  2^11 (2048, or "2k")
    QPD A SEG 2    ::   H1:SPI-H23_OL_QPD_A_SEG1_OUT_DQ          ::  2^11 (2048, or "2k")
    QPD A SEG 3    ::   H1:SPI-H23_OL_QPD_A_SEG1_OUT_DQ          ::  2^11 (2048, or "2k")
    QPD A SEG 4    ::   H1:SPI-H23_OL_QPD_A_SEG1_OUT_DQ          ::  2^11 (2048, or "2k")

I've made ndscope templates for these channels, which live in (hopefully self-explanatory names):
    /opt/rtcds/userapps/release/spi/h1/ndscope/
        FBR_PWRIN.yaml
        IFOs_Raw_Ts.yaml
        QPDA.yaml
        QPDB.yaml

The settings have been saved to the SDF system and committed to the userapps repo under
    /opt/rtcds/userapps/release/spi/h1/burtfiles/ 
        h1spih23_safe.snap

Also, for the record, Erik just helped me convert the target area .snap files to be softlinks to this one userapps file for now,
    /opt/rtcds/lho/h1/target/h1spih23/h1spih23epics/burt/
        safe.snap -> /opt/rtcds/userapps/release/spi/h1/burtfiles/h1spih23_safe.snap
        OBSERVE.snap -> /opt/rtcds/userapps/release/spi/h1/burtfiles/h1spih23_safe.snap

Checked the baffles for the CRS on the constructed unit, everything fit fine. 

Spent time doing alignment for the other two constructed HoQIs. 01-SN008 aligned with 87% fringe visibility, this required the retroreflector on the baseplate to be rotated a bit as it wasn't quite in the correct position. 
01-SN007 spent a long time trying to align (this was also worked on the other day with limited success), couldn't get above 60% FV so we decided to take it apart and redo it with the dowel pins in place. After taking it apart we found that the QWP was damaged by the metal screw, honestly quite impressive that it was still seeing 60% FV! See photos. The sin PD cable is also damaged and will need to be fixed before we use this HoQI. 

Assembled the remaining HoQIs including the dowel pins. Need to clean the final HWPs to finish this assembly. Additionally, 01-SN006 has no PDs as it is using the faulty assembly from before, 02-SN006 connector needs to be flipped.

Current HoQI status: 2 aligned on CRS, 1 aligned, 2 with faults, 3 (mostly) constructed waiting to be aligned. 

pic 1 - broken sin pd
pic 2 - broken QWP
pic 3 - serial number for broken sin pd assembly 

Ibrahim, Anamaria

This morning we:
-  set up the FC fabric on the drum;
- lowered the ITMX ACB to take its wedge, and then used it to swing the ITMY ACB out of the way;
- inserted the peek "Kurt fingers" between ITMY and its CP in preparation for installing the FC jig this afternoon.

This afternoon we:
- set up the jig around the test mass;
- tightened the drum with the fabric onto the test mass while watching the fibers on camera;
- added the grid+mesh for pressing, as well as picos on the ring of the drum;
- added the funnel and hose setup, connected to the spigot.

We will add more details and photos later. For now we are dumping photos in the common FC google drive. Folders named by date and activity.

First attachment shows that the ISS array PDs suddenly lost the beam (bottom left) right after the IM1 LL OSEM jumped (top left) on Friday, meaning that the problem was not just the OSEM sensing, somehow the alignment was affected by this.

This morning Rahul physically inspected IM1 and checked  cables and electronics but nothing was wrong. He pulled the LL OSEM and nothing was wrong either. He put it back on, centered the OSEM depth (only for LL) and everything looked normal.

We locked JAC and suddenly we got the flashes on ISS array back, see the second attachment.

Though this is good, it's also frustrating that we don't understand what happened. My theory is that somehow something (OSEM bobbin thing?) was charged and pulled the closest metal electrostatically, changing the DC alignment.

We'll  see if we can center REFL ASC sensors as well as ISS QPD. If we can, we'll proceed to close out.

FYI, following is the IM1 OSEMINF before the jump, right after the jump and now. UR experienced 500 counts jump and clearly got back after Rahul's job. Changes for UL and LR were much smaller but they got closer to the pre-jump position, too. Don't pay much attention to the 1000 counts difference for  LL now VS pre-jump because it was reset. 

When I hammered the below table "beard" baffle on May 26 (alog90335), something wasn't correct with the way I saved the data or my configuration or something else. Either way, Jeff and went in today and hit that as well as the SPI ISIJ assembly with and without the cylindrical shroud (D2500030). Preliminary results are looking much better, so I'll clean those up and post them soon with a whole writeup.

Before starting the cage baffle install we took a reference of the optical levers (with ISI locked) such that later when we unlock the quad we can tell if there was a significant shift. NB there were small shifts at LLO when we installed these baffles and we are still baffled as to why. Since they attach to the cage, which is connected to the ISI and the ISI gets rebalanced, it's unclear why they'd shift more than some 20-30 urad. 

I took one reference pre-vent, circa Nov 28, when we were still locking full ifo. The second reference is recent, at air, with the ISI locked.