H1 OMs 1-3 EPIC Infrastructure Resinstalled; Not Yet Tested Because In-Air Cabling Not Yet in Place

J. Kissel, D. Barker, R. McCarthy

As was done with RMs last week (see LHO aLOG 38883) I've re-populated the EPICs records and foton filters for H1 SUS OM1, OM2, and OM3 after having moved them over from the old h1sushtts.mdl front end model to the h1susomc model. 

Having reminded myself of all that was needed with the RMs (including DAMP and COILOUTF gains), I believe I've covered all bases. 

Several Things of Note:
- I've gone back to the RM_OVERVIEW and HSSS_OVERVIEW screens because the GDS_TP screen was incorrectly still pointing to the H1SUSHTTS GDS TP screen of the OMs. So, I created a new macro variable MASTERMODEL (and lowercase mastermodel) in all of the HSSS macro files (rmall, omall, imall, and each individual file).

- We also have compiled and installed the new h1susauxh56 to pick up all the new SUS' coil driver monitoring.

- I have NOT yet updated / created a new safe.snap for the h1susomc model that includes the OMs.

- I have not bothered to restore alignment offsets. 

In-air cabling and electronics (re)install for OMs is not yet complete -- in addition to the front-end / IO chassis ADC and DAC card shuffle, which is complete -- the OMs' feedthrough exit out of HAM6 are getting re-arranged to make room for all the new SQZ elements in HAM6 and the former in-air cabling is just ~10 ft. too short. As such, we won't get the chance to confirm /test that all the digital infrastructure has been restored properly until that stuff gets finished.

WHAM6 -X Position Septum Window VP Installed

With GregG in chamber and JimW helping outside, the installation of the ViewPort onto the -X most Septum Window was pretty straight forward.  A new o-ring was used and the window/flange clocking mark was put at 9o'clock (-X) and was torqued in three steps to 16 ft-lbs.  Attached photo shows these men in action.

Add Water to PSL Crystal Chiller

   Added 250ml water to the PSL crystal chiller. Diode chiller water levers were OK. 
   Both filters look good as well. 

Monday 8:15am Vent Meeting Notes

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

PSL Weekly Report - 10 Day Trends FAMIS #6169

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

1800 - 1830 hrs. -> Kyle on site check

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

IO rough alignment in HAM2 done (Ed, Chreyl, Patrick, Keita)

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

LVEA is laser safe.

ITMx fiber welding complete

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.

SQZ: Add ADC card to h1susauxh56, install first version of model h1susopo on h1suh56, DAQ restart

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.

WHAM6 5-Way Cross Added to D4--ISI rerouted through

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.

Python code to transition SEI systems during very large earthquakes

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 .

Ops Day Shift Summary

Broken glass found in HAM6

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. 

Do you think you should write an incident report on this?

For further follow up on the broken beam dump -- identified as the OMC REFL Beam Diverter dump -- check out LHO aLOG 38998 and FRS Ticket 9196.

Regarding the dump which has a "glancing blow" burn mark, that's the dump catching the OM3 TRANS beam. Indeed, the burn mark appears on the *outside* of the functional part of the dump. So, I don't think there's a need for action there (and hence no need for an FRS ticket).

H1SUSITMX Fused-Silica Fibers Violin Mode In-Air Characterization which QUAD Fully Suspended

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.

Jeff - the transformation between "Angus Coordinates" and Global coordinates isn't correct here. The correct identifications are
FR  +X+Y
FL  +X-Y
BR  -X+Y
BL  -X-Y
so the two fibres that look like they have been swapped between measurements were just misidentified. So, the previous In-Air identification is actually:

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

FL         +X/-Y      502.2+/-0.25     

FR         +X/+Y      500.8+/-0.25     

BL         -X/-Y      501.2+/-0.25     

BR         -X/+Y      499.9+/-0.25     

I'll let you re-identify your results as there is a 50% chance I'll switch them the wrong way.