Went over items on the White Board.  Monday is piled on because it both has items which carry on through the week and also tends to have items carrying on from previous week.  Below are some items I was able to jot down some notes for:

• Bugs in the LVEA!  There is an infestation of non-flying & slow bugs in the LVEA. Please be mindful of this when starting in-chamber work & remove/kill insects before opening up any chambers.
• IO Work continues:  Mainly mechanical work over next few days.  IO will only need LASER SAFE from Mon-Wed this week.
• HAM5 Opening:  Bubba noted there was an opening on a HAM5 door--cloth cover was not covering entire door.
• Vacuum System work:  Multiple ongoing activities noted.
• HAM6 Broken Glass:  Discussion of whether this needs to be recorded in a report.
• PSL Slow Water Leak:  This could take up to a full day & will take place on Wed.
• HVAC Controller Work:  Apollo continuing this work.  Will need to watch temperatures in the LVEA & Kissel put an LVEA temperature strip tool up nuc0 in the Control Room.
• Went Over Work Permits

Nothing unusual considering the work being done. There is a slow chiller leak that is being addressed.

VBOD bake and LVEA purge air (KOBELCO) - all good.  

IMC alignment was refined a bit as it changed. We used MC1 and MC3.

The beam with the correct polarization is clearing Faraday.

Used IM3 to center the beam on PRM iris, IM4 to center on PR2 iris, iterate.

• We ended up centering REALLY well on PRM iris but ~1mm too high on PR2 iris because IM4 DAC is already close to railing, and 1mm is nothing on PR2 (or on PRM for that matter). Since it doesn't matter much, we could have relieved IM4 by tilting IM3 down more (i.e. PRM iris too low) but I didn't bother.

The reflection from PRM was centered on the REFL baffle between HAM2 and HAM1 by tweaking PRM.

Misaligned PRM to steer the REFL beam on the high power beam dump through the viewport baffle on top of HAM2.  Pro tips:

• PRM PIT-YAW motion is NOT supposed to look orthogonal on the plane of the viewport baffle on the top, even if PIT/YAW are perfectly orthogonal at PRM. It's not a bad PIT-YAW coupling issue, it's just a poor projection plane issue.
• Use an IR viewer with long 75mm C-mount zoom to see the baffle. Don't lean into the chamber attempting to have a better view, just sit on the work platform and you'll have a good view and your upper body is far more stable . Move the beam by a big amount in PIT until you see the beam at the edge of the baffle hole, go in the opposite direction and do the same, take an average. Do the same for YAW. And you're roughly done. You don't have to do better than roughly.

Attached shows the alignment sliders for things as of now and good "misaligned" offset for PRM.

LVEA is laser safe. Tools and irises and such are still in HAM2 and HAM3.

LVEA is laser safe.

A. Bell, J. Oberling, T. Sadecki

ITMx has been successfully hung as a newly welded monolithic.  I'll leave it to Jason to post the actual numbers, but the PUM to TM differential pitch better than the old version of ITMx.  Now to put it back together in chamber next week.

WP7162. Jeff, Arnab, Dave:

Arnab and I installed a 6th ADC card into h1susauxh56's IO Chassis.  To maintain a physical ADC block or cards in the Chassis, we moved the 5th card from slot 1-8 one slot to the right to 1-7, and then installed the new 6th card into the vacated slot 1-8. The interface cards are in numerical order.

The h1iopsusauxh56 model was updated to read the 6th ADC.

We installed Jeff's new h1susopo model into the CDS system, following my instructions on the wiki page https://cdswiki.ligo-wa.caltech.edu/wiki/AddingNewFrontEndModel

We were planning on adding the SQZ beckhoff PLC (h1ecatc1plc4) to the DAQ as well, but I discovered 60 channels in the INI file which are not in the running system. I will work with Daniel and Patrick next week to resolve this.

The DAQ was restarted to sync up to the new h1iopsusauxh56 and the new h1susopo model. The second trend file at the time of the restart was hidden away for NDS1 trending purposes.

As-Built IO Chassis drawing changes are forthcoming.

The image attached shows the 5 way cross installed.  The Fiber feedthru (currently blanks) are visible below the cross.  The five ISI cables are rerouted to FTs on the cross but the in-air cables have not been reconnected.  I'll do that after Kyle gives it all a look and touch; fingers cross for leak checks down the road.  The facing 25p has no cables but it was readily available, that is why it isn't a blank.

I've added a button the ISI_CONFIG screen that transitions the seismic systems to a robust state to protect the suspensions during a verly large earhquake, like the infamous Montana earthquake or the recent Mexican earthquakes. It's the red button that says Very Large Earthquakes. This script requests the DAMPED state for all of the chambers with ISIs and switches the gains of the all the L4Cs and GS13s. This button is likely temporary, but is probably the state we want to leave the seismic systems in when no-one is on site in the future. The script lives at /opt/rtcds/userapps/release/isi/common/scripts, and is called SET_EQ.py .

On the 5th I opened the soft covers on HAM6 to lock the ISI and noticed that one of the black glass pieces was broken. I'm posting a couple of pictures here. Betsy, JeffK and others have looked to see if we noticed this during the last HAM6 vent, but none of the pictures in the alog show this glass in any detail. 

The completes WP# 7177. 

I forgot to open the new isolation valve and I see that the ATM setting on the existing PT120B electronics is WAY out of adjustment for the new sensor head so I'll have to correct at the next opportunity.  

In my quest to improve the stability and ease of using auxiliary lasers for the IO alignment in the HAM chambers, I designed a system that includes a platform attached to the ISI, that becomes the temporarily mount a laser to the ISI table.

This set up was necessary for aligning the MC2 Trans beam path, since the coating on MC2 allows very little light through at 0.2W of power.  At 0.2W, it's not possible to see the MC2 trans beam with the single shot beam from the PSL.

An ISC breadboard was attached to the edge of the HAM3 ISI table, a rail with a mount for a laser pointer was attached to the breadboard, and in this case two gold steering mirrors, and two irises, were used to align the MC2 Trans beam.  A picture is attached.

• The breadboard came from Corey's ISC inventory
• Mounts and rails were collected from the optics lab
• All parts that came into direct contact with the ISI were class-A and class-B
• Some parts are only cleanable to class-B-ish, like the gold steering mirrors, so were carefully mounted on class-B posts
• For future reference, the laser pointer beam was very oblong.  The beam orientation ended up at around a 45 deg angle, which was a bit more difficult to read on the irises, so in the future, I would adjust the beam orientation
• On the path to the QPD, we identified three beams, the main beam, the second internal reflection from MC2, and a reflection from the steering mirror black glass

The setup was very successful, which made it possible to align the MC2 Trans QPD.

- Cheryl, Corey, Ed, Keita

ROM RH2, which sits behind IM1, and steers the IMC Trans beam to IOT2L, was repositioned and realigned today.

As found, with a well aligned IMC that was flashing 0-0 and 1-0 modes, which has beams that are well centered on the IMC optics, the beam coming off of ROM RH2 encountered an OSEM cable on it's path off of HAM2.

The upper right IM1 OSEM cable was hanging down in front of the mirror, and clipped about 1/2 of the beam coming off of the table.

For a temporary fix, I used an aluminum strip that was not effectively holding the cable to a doc clamp, to hold the UR OSEM cable to the UL OSEM cable, in order to give the beam from ROM RH2 clear passage.

This was a temporary fix, and the long term fix is being worked on.

- Keita, Cheryl, Ed

J. Kissel, T. Sadecki

Attached are the results of the H1 SUS ITMX fiber characterization perform last week while the QUAD was (in-air) still fully suspended. After initially gathering data on the +X / +Y, Front Right (as viewed looking at the HR surface, a.k.a. the Angus Convention) without using a speaker array (see LHO aLOG 38743), we resumed the next day using the array, but with it not attached to the structure in any way, just resting on the chamber floor near the Left or Right side as needed. 

To complete Borja's table from LHO aLOG 38309,

Angus      Global      Prev.            Avg.           This 
Conv.      Coord.      In-Air          In-Vac         Result

FL         -X/+Y      502.2+/-0.25     502.68     499.656+/-0.015

FR         +X/+Y      500.8+/-0.25     501.15     500.797+/-0.015

BL         -X/-Y      501.2+/-0.25     501.35     500.922+/-0.015

BR         +X/-Y      499.9+/-0.25     500.13     502.219+/-0.015

Naturally, the confusing directions in which these change from in-air in in-vac makes me wonder whether the naming convention didn't get mix up somewhere along the way...

However, with these measurements, we've taken up to the 6th harmonic in air. There are a select few of these results which are highly questionable, if not down-right untrustworthy. They're marked with an asterisk. However, all results are determined by just finding the maxmimum frequency bin in the spectra. Having starred at all the data by eye, this works, but because the Q of the mode is so large in air, I inflate the uncertainty to include two bin-widths, assuming that the mode is perfectly bin-centered (which isn't true). In other words -- take this data with grains of salt and a few flecks of black pepper.

Here're those results in tabular form:
         FL(-X/+Y)    FR(+X/+Y)    BL(-X/-Y)    BR(+X/-Y)
Fund.    499.656      500.797      500.922      502.219
2nd      991.859      993.5781     996          995.2969
3rd      1455.5       1461.906     1461.891     1471.969*
4th      1923.953     1924.766     1923.594     1931.125
5th      2384.375     2396.813     2382.125     2460.813*
6th      2837.75      2845.063     2846.625     2830.813

Excitingly, at least in broad strokes, 3 of the 4 fibers show very similar in-harmonicity (and that which doesn't has the black pepper data points).

I'm not sure how, but it would be very interesting to compare these higher harmonic results against the in-vacuum higher harmonics. Do we have individual fiber identification for non-fundamental harmonics? It's not reported in the LHO Violin Mode Table, for instance.