Ibrahim, Randy, Betsy, Rahul

Today, we:

• Prepared the BSFM for test stand removal which involved taking off some wire baffles, loosening dog clamps and wiping down the BSFM platform (LSAT).
• Set a perimeter for BBSS to go up (in same position) using dog clamps.
• Installed and fit-check the 45 deg. lifting bars - the screws seemed to be too long so we used 2 nuts to back them out.
• Brought the aluma lift in to pick up the suspension and lifted it out of the test stand smoothly. 
• Rested it in the cleanroom on the LSAT with some dunnage blocks.

See pictures

I've gone through and filled in most of the infrastructure for the BBSS (found under BS/ITM on sitemap as BBSS temp). Values and filter settings have been saved to sdf and filters added have been committed in H1SUSLO12.txt as r35219. For the majority of the filters banks, I turned any filters that are shown as being on in whatever I referenced them from, but all filter banks have INP and/or OUT OFF, so no signal can pass through.

Infrastucture filled in:

All stages
OSEM2EUL / SENSALIGN / EUL2OSEM Matrices
Filled out according to matrices calculated in /ligo/svncommon/SusSVN/sus/trunk/BBSS/Common/MatlabTools/make_susbbss_projections.m. The Y direction matrix elements for M1 OSEM2EUL have been left blank for now

M1
OSEMINF Filter Banks
- _{F1,F2,F3,LF,RT,SD}_{X_RAW,Y_RAW,SUM} have satamp compensation filter of zpk([0.145],[720e-6],1) installed in FM1, called 0.15:7e-4
- _{F1,F2,F3,LF,RT,SD}_{X,Y} have a conversion from counts to um with a gain(250) in FM5, called to_um. This value was found by using the conversion from Tom of 4000 counts / meter, and then converting meters to um.
- Tom said that we will not need any offsets, and the QOSEMs are calibrated so we don't need any special gains in the filter banks, so I've set the filter banks to gains of 1.
WATCHDOG Filters
BANDLIM Filter Banks
- Same filters as in OSEMINF, plus acBandLimiter
RMSLP Filter Banks
- 10 second LP added into FM1
LOCK Filter Banks
- Copied over from BSFM M1 for now
DAMP Filter Banks
- Copied the damping filters from BSFM M1 over for now
COILOUTF Filter Banks
- Copied over from BSFM M1 for now

M2
OSEMINF Filter Banks
- Satamp precise compensation filters inserted into FM1 according to the installed satamp for M2, plus conversion to_um in FM5
- Offsets and gains need to be re-done for BBSS M2
WATCHDOG Filters
BANDLIM Filter Banks
- Same filters as in OSEMINF, plus acBandLimiter
RMSLP Filter Bank
- 10 second LP added into FM1
LOCK Filter Banks
- Copied over from BSFM M2 for now
OLDAMP Filter Banks
- Copied over from BSFM M2 for now
VRDAMP Filter Banks
- Copied over from BSFM M2 for now
COILOUTF Filter Banks
- Copied over from BSFM M2 for now

M3
OSEMINF Filter Banks
- Satamp precise compensation filters inserted into FM1 according to the installed satamp for M3, plus conversion to_um in FM5
- Offsets and gains need to be done for BBSS M3
WATCHDOG Filters
BANDLIM Filter Banks
- Same filters as in OSEMINF, plus acBandLimiter
RMSLP Filter Bank
- 10 second LP added into FM1
OPLEVINF Filter Banks
- Copied over from BSFM M3 for now
LOCK Filter Banks
- Copied over from BSFM M3 for now
COILOUTF Filter Banks
- Copied over from PR3 M3 since they have the same electronics for M3

TITLE: 05/12 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
CURRENT ENVIRONMENT:
    SEI_ENV state: MAINTENANCE
    Wind: 4mph Gusts, 1mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.09 μm/s 
QUICK SUMMARY: IPC errors on h1susMC2 and h1seiproc, dackill on h1iopseib2. All sus aligned and damped except PR2 which is in safe (looking into this), SEI in state captured by the whiteboard. Temps look good and dust counts look good in the LVEA. More laser hazard work planned for the day in the LVEA.

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

I went to HAM3 to see that the MC2 beam position wasn't crazy. See the first photo, the beam is to the left (+Y direction) relative to the baffle on the HR side but the baffle itself is offset in -Y direction relative to the cage.  Green lines are extension of the EQ stop screws to guide your eyes.

I also opened the ISCT1 and moved the mirror in front of the REFL BBPD out of the way and directed the beam to IFO REFL camera (because I couldn't see the beam at all without moting the mirror).

While manually aligning the IMC, we found that somehow things are in such a bad state that the MC2 TRANS SUM decreases when IM4 TRANS SUM increases, and vice versa. Improving the IMC alignment using IM4 TRANS as well as IFO REFL camera made the flashes stronger to the point that we can see 00 mode once in a while. I was also able to see the beam in the ISS path. But MC2 TRANS was nowhere near centered. Attempts to resolve this by incremental changes failed.

We wondered if something behind MC2 was bumped and changed the alignment into MC2 trans. I looked at the path and didn't see anything obvious. The beam transmitted through MC2 was visible using a card and a viewer, it was not clipped by the baffle behind MC2 nor the BS for the beam dump. I could not see the transmission of the BS, though, it was too weak, so I cannot confirm if the steering mirror in front of the QPD was bumped or not.

Elenna started making big changes for JM3 in PIT (to make big YAW changes in the beam injected into IMC, remember that YAW and PIT are flipped between JAC and IMC, IMC WFS takes care of this but that won't help when you're manually aligning JM3) and moving MC2 and MC1 so that the IMC follows the input beam. Repeating this in YAW anShe successfully centered the beam on MC2 trans. 

At this point I looked at the MC2 beam position again, see the second picture. Apparently the beam moved in YAW by a few mm to the right (i.e. -Y direction).

Elenna will post which optic was moved by how much in which direction.

Jenne is now trying to put IM4_TRANS and ISS QPD beam position back where they used to be using IM2 and 3.

Ibrahim, Betsy, Rahul

Today we glued two of the four AOSEM flag standoffs onto S2 of BBS01.

After gluing, we wanted to make sure we were contacted evenly so an hour and a half later, we used magnets to remove the flags from the glued-on mounts.

We discovered that some glue was touching the bottom of the magnet bushings, so we elected to use some foil as shims to create more space between S2 and the bottom interface of the bushings.

Otherwise, the mounts were flat on the surface. We put the bushings back on for the overnight cure. See pictures below.

TITLE: 05/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
SHIFT SUMMARY: The LVEA is still in laser hazard and will be for a few more days. The IMC alignment continues to prove difficult to get right. ITMY IAS finished up today. BBS work continues, CP1 regen, and more!
LOG:

• 1629 light pipe open                                                             

FAMIS 63898 (I think. With the new system there are duplicate tickets, so I picked the one that has a schedule assigned.)

No major events of note this week.

Micheal Ross showed up in the control room, so we spun up the NCAL.

It wouldn't spin at first because there was a current Latch reset button that needed to be pushed. Michael pushed System Reset and Latch Reset in rapid succession.
More documentation can be found here: LIGO iNCal Operating Procedures.pdf T2600149-v1. 

We ran it for 4 minutes 30 seconds starting at 21:25  UTC. 
H1:CAL-NCALX_MOVE_VELOCITY_VELOCITY_REQ was set to:  104 which translates to ~ 0.991 hz.
H1:CAL-NCALX_VELOCITY_KP_REQ: 0.0100 Mn/rad/s 
H1:CAL-NCALX_VELOCITY_FILTER_REQ: 5 ms

NCAL ran. 
Beckhoff I/O H1:CAL-NCALX_AXIS_ERROR_ID now has an Error status. 

Pressing the system reset button cleared this Beckhoff I/O error status indicator. 

Jenne reminded us that with the installation of the JAC, the process we use to offload the IMC WFS should be updated to use JM3's alignment instead of the PSL PZT since it's now the alignment mirror directly upstream of the IMC. I've done this in the IMC_LOCK Guardian node's code by essentially just doing a "find and replace" for the term "PZT" with "JM3" (and double-checking the result, of course), all of which happened in the OFFLOAD_MCWFS state. We'll test this state's functionality at a later date.

Changes have been committed to svn and loaded.

TITLE: 05/11 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: 10mph Gusts, 6mph 3min avg
    Primary useism: 0.01 μm/s
    Secondary useism: 0.12 μm/s 
QUICK SUMMARY: IPC errors on h1susMC2 and h1seiproc, dackill on h1iopseib2. All sus aligned and damped, SEI in state captured by the whiteboard. Temps look good and dust counts look good in the LVEA, the ends saw counts up into the 2000s during the last bout of wind 12 hours ago.

Laser hazard work in the LVEA continues today.

[Tom R, Oli]

Summary: QOSEM testing on the BSFM will require the tablecloth to be shifted OR SUSP to be raised, probably not worth the effort to do so given the BBSS will be ready for QOSEMs shortly.

Last Friday Oli and I attempted to install the QOSEMs onto the now removed from chamber and on test stand BSFM suspension, now that the IAS work was completed. The purpose of this test is to run and compare TFs taken with QOSEMs, providing a final functionality test before installation on the BBSS (which is not yet ready to accept QOSEMs). The full test and integration plan for the QOSEMs / BBSS can be found here T2600169.

We began by removing the SD BOSEM from M1 of the BSFM, and swapping the flag out for the QOSEM variety. We installed the QOSEM onto the cage, and used the existing DB25 in vac extensions and in air cables to run the QOSEM to its sat amp in SUS-R2. The QOSEM and its entire signal chain was functional, with readouts from this SD QOSEM appearing as expected in CDS. 

Unfortunately upon unlocking the suspension, to align this SD QOSEM, we found that its y axis could not be brought into range with the cams (at its best was ~1mm off). This is a similar issues we faced when setting up the BBSS at LLO. As the SD BOSEM does not have a readout in this 'y' or vertical direction, misplacement of the tablecloth by ~1mm is unnoticeable, and does not impede function of the BOSEMs, but as we are activity trying to readout this axis it does matter for the QOSEM.

As such, to setup the QOSEMs on the BSFM, we would need to raise the tablecloth, or SUSP via the blade spring angle. While this certainly could be done, at the moment this feels like an unnecessary amount of work to do for a quick test of the QOSEMs, given the BBSS will be ready shortly. For now we have abandoned this test, and removed the SD QOSEM from the BSFM, reinstalling the original BOSEM.

In order to search for retroreflections of scattered light that might recombine and cause scattered light noise, I take pictures from the point of view of the beam spot on important optics. The flash on the camera is right next to its aperture so, when the camera is held close to the location of the beam spot, the path of the light from the flash is similar to that of light scattered from the beam spot during observation, and glints in the photograph are indicative of potentiial retroreflections of scattered light. The distribution of light from the flash is, by design, more uniform than that of most scattered light, so more off-axis retroreflections in the photos tend to be less important.

An old photo taken from near the beam spot on PR3 showed a glint from an optic on the POP path so I re-took beam spot photos last week since we are baffling HAM3. The figure shows that I did not find a retroreflection in beam spot photos from PR3, but I did in photos from MC1 and from close to the center of PRM. I took beam spot photos with both my IR camera and cell phone – the figure shows cell phone photos as they are eaisier to interpret, but photos from both cameras show the same issues. I could verify these retroreflections and track them to their source by eye using a head lamp near my eyes. The PRM retroreflection is from the last optic on the POP path and the MC1 retroreflection is from the second to the last optic on the POP path (see diagram on the second page of the figure).

Im a little surprised that there are two of these random alignments, but I guess it is due to how small the angular differences between the paths from HAM3 to HAM2 are and the number of mirrors on the tables. I am also concerned that my beam spot photo technique only picks up retroreflections and not reflections of scattered light from one optic to a different optic. I would also like to make us more aware of these cross talk issues in planning optic paths and suggest that it might be worthwhile to develop code that checked for this.

I don’t know how bad these retroreflections are, but, in my photos, they are brighter than the reflections from ballast masses and the table that we are trying to baffle, so I may try to baffle the PRM retroreflection when we return to baffling. Im not sure how I could baffle the MC1 retroreflection without blocking the POP path.

Ryan Short, Tony Sanchez, Sheila

We took beam profiles of the sqz beam in the homodyne path using the Thorlabs M2Ms beamprofiler extension.  It made collecting data for a variety of psams settings much faster than using a scanning slit profiler alone.  

Tips for using this very nice extender kit:

• The visible alignment laser made alignment easy.
• We used the lens LA1461-C for 1064nm, the list of lenses and wavelengths is here: lens list
• make sure that the unit is plugged in, powered on with the power button, and connected to the laptop before you start the software.  Close and re-open the software if "translation stage control" and "M2 set" don't show up for you at the bottom of the "beam settings" window.  Once they show up you just have to go to the M^2 button and hit play to make a measurement.  
• You can get the fit beam parameters by saving a pdf by clicking the button that says "Save test Protokol", you have to hit save twice on the screen where you type a file name and again on the next screen.  "Save Measurement Data and results" gives you all the data, but not the fit beam parameters.  You again have to hit save twice.  
• Sivananda Reddy contacted Thorlabs and posted a diagram of where the reference plane is in the dcc: T2500077

We spent some time refinding the IR beam on the SQZT7 IR PD, documented this in it's own alog so it's easy to search: 90183

We set the profiler as shown in the attached photo.   The flipper mirror is 50.75" from the bottom persicope mirror, a steering mirror is 225mm from that, and the reference plane is 260mm from the steering mirror, so the reference plane is 1.774 meters from the bottom periscope mirror.  Leo Schrader has a helpful list of distances in the google document linked to T2500228.

• In 85282 Leo measured the beam distance from the top to bottom periscope mirrors to be 574mm. 
• The distance from the top of the persicope to the beam diverter was measured to be 84.5" in 61755.   
• In 75749 the distance from the beam diverter to ZM5 is listed as 1183.54mm based on a CAD drawing from Don Griffith. 
• This means the total distance from the reference plane to ZM5 is 5.678 meters.  We have left the profiler and temporary mirrors in place so that we can use them during the upcoming HAM7 vent.  

J. Kissel, J. Warner
ECR: E2400026
WPs: 13237, LHO:13238
Final Design Doc: T2400145
Relevant Systems Level Drawings:
    . Mechanical Assemblies
        :: ISIJ Reflector D2400102
        :: HAM Table Baffles D1700335
        :: HAM2 Systems Layout D0901083 (not yet-inclusive-of-SPI)
    . Electronics Wiring Diagram 
    . Cable Routing In-vac Cable Routing Plan from G2401479 (pages )
    . Flange Layout D1002873-v11

Executive summary:
    - Removed ISIJ +X-side, center, HAM2 ISI table baffle from D1700265-v4 Type 2 
        :: Bracket mounting bolts left screwed into ISI optical table for this will eventually become a D1700265-v4 Type 3 and remounted.
    - Installed ISIJ Reflector + QPD Assembly D2400102 on +X ISI side wall (D071057-v2), with its shroud (D2500030) in place
        :: We didn't weigh it, but the SW Assembly predicts a mass of 1.96 [kg], which we can likely round up to 2.0 [kg] with the shroud installed.
    - Routed and connected QPD read-out cable system to D3 flange, F10 spigot.
    - Routed and connected picomotor cable system to existing D1101515 quadrupus leg Cable #3, J4 
        :: Cable #4, J5 is connected to IO PM5 mirror, Cables #2 J3 and #1 J2 were reset in neat coil with connectors floating to avoid electrical grounding as before.
    - Nudged make-shift baffle system using D1700261 ballast mass baffle mounted vertically on the +X / +Y / Beam Height corner of the chamber wall upon entry into beamtube.
        :: the will DEFINITELY need a technically-minded reset.

In at 10:30a PT and out by 12:30a PT. It's so lovely when everything goes to plan!

Pictures and further info to follow in the comments below.

Camille (CIT), Austin , Rahul

This morning we went to HAM7 chamber and changed the preload on ZM4 (P-SAMS) suspension as per the document E2300463_V1. This changed the RoC of ZM4 mirror without the PZT actuation. Given below are the details of our work - Camille will add pictures later on.

- After setting ZM4 into SAFE state we locked all three stages of the suspension. We had already taken healthy TF measurements before starting our work.

- The bottom mass cable was disconnected and carefully re-routed so that it stays away from the fixture plate.

- four add-on masses (basically 1/4-20 screws with washers) attached to the bottom mass was then removed.

- bottom mass Fixture plate (D2100121) was attached to the structure using six 8-32 screws.

- The bottom mass (already locked using EQ stops) was then further clamped using four 1/4-20 screws through the fixture plate. We had to adjust the height of the bottom mass to the align the threads with the holes on the fixture plate.

- Once the bottom mass was securely clamped, we removed the three set screws on the preloader.

- Using a torque wrench we increased the preload on the bottom mass by ~29 in.lb. (Total preload from torque after increase was 75 in.lb).

- We then followed all the above steps backwards (i.e set screws, add on mass put back, fixture plate removed, cable re-connected and the suspension set free).

- Once all done, we started damping the suspension and checked for any BOSEM flag changes - looked all fine.

- We took the transfer function measurements and ZM4 looked healthy.

Hence we took all the tools out and put the curtains back on HAM7 chamber.

Next, we will go into laser hazard with SQZ team and check for any changes in beam alignment and make adjustments as required.