J. Kissel, B. Weaver

Betsy and I took standard top-to-top mass transfer functions of H1 SUS SRM and H1 SUS SR3 to ensure after the heat of first contact removal and door re-application they're still free. They are. Great!

Results attached.
(Suspensions are undamped, with alignment offsets ON)

Data and updated processing scripts have been committed to the repo.
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/SAGM1/Data/
    2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_L_0p01to50Hz.xml
    2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_P_0p01to50Hz.xml
    2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_R_0p01to50Hz.xml
    2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_T_0p01to50Hz.xml
    2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_V_0p01to50Hz.xml
    2017-12-14_1729_H1SUSSRM_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HLTS/H1/SR3/SAGM1/Data
    2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_L_0p01to50Hz.xml
    2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_P_0p01to50Hz.xml
    2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_R_0p01to50Hz.xml
    2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_T_0p01to50Hz.xml
    2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_V_0p01to50Hz.xml
    2017-12-14_1743_H1SUSSR3_M1_WhiteNoise_Y_0p01to50Hz.xml

Attached are a few pictures of the newly added baffles around the West (+Y) side of the HAM5 table, shielding the table, and SRM and SR3 optics.

Here are a few pix of the new OFI baffle and AWC mirrors on HAM5, installed over the last couple of weeks.

Although Kissel has been posting mass records of B&K results on lots of in-vacuum items, I'll show the full whiteboard list of what he has measured and been analyzing in the attached photo.  All B&K measurements for this vent have been complete!  Well done!

I'm posting the BnK measurements of the HAM2 & HAM5 table baffles. I've split the plots up into similar structures (Plus/Minus X/Y beard baffles, Middle beard Baffles, HAM2 table top baffles, HAM5 table top baffles) and equivalent excitations/accelerometer orientation relative to "beamline" (X for HAM2, Y for HAM5). I'm using Jeff's names for the baffles, so Table baffles are the beard baffles. Table Top baffles are the table baffles that typically lie flat on the ISI optics table in front of the suspensions. It looks like I grabbed the wrong data for the MC1 Table Top baffle, so I need to look into that some more.

Most of the well resolved stuff seems to be well damped, I don't think I saw any of the low frequency (50-60 hz stuff) on the first plot in the HAM5 or HAM2 ISI tfs. The sharp 120 hz feature on the HAM5 MinusX table baffle is worrying, but there was probably a lot of loose mass on the table at the time. The HAM5 measurements are from Dec 6, before Hugh and Brijesh balanced that table.

I've put the txt BnK exports in the Seismic SVN at:

 /ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/Common/Data/HAMBnK_measurements/HAM2/

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/Common/Data/HAMBnK_measurements/HAM2/

The script I made the plots with is at:

/ligo/svncommon/SeiSVN/seismic/HAM-ISI/H1/Common/Data/HAMBnK_measurements/HAM2_table_baffles.m

HAM2: align intensity stabilization photodiode
align beam coming off HAM2 table

Betsy, Travis done with BSCs, leaving first contact on due to delay in HAM2 work

IP4 is removed, next step is to install NEG pumps, first is ready to go on

Chandra out next week, Kyle in charge of pump down
Gerardo testing HAM5 viewport

TMDS installed
Cryopump decomissioning at mid Y scheduled for mid January

Hugh: feedthrus ready to go on HAM6

Jason asked to start bringing optical levers back online over next couple of days

TJ and Sheila starting to populate table

Volunteers sought for onsite inspections during holidays

Kyle and Chandra may run leak checks over holidays

The LVEA has transitioned to LASER HAZARD

We have been observing was seems to be flow restrictions in purge air so today as means of trouble shooting we replaced filters at the skid. Three of the four filters were replaced (could not replace the third one because its threads seem to be galled, but it visually looks ok and has been replaced in the past). The first filter had burn marks. The second filter was heavily loaded with rust dust. The fourth filter looked ok.

We disconnected all seven purge air points of use in LVEA  to flush system with new filters. After several minutes we measured zero particle counts and -28degC dew point.

Closed WP 7247.

I'm running TF's oin SRM and SR3 SUSes.

At around 5:30 am several text alarms for CP7 rolled in all at once. MEDM screen looks normal. Will be in soon for visual inspection. Alarms are LN2 level error and discharge pressure error. Also got alarms for EY Y2 pressure and RO water system. 

The LVEA has been transitioned to LASER SAFE.

• PSL beam aligned to the MC1 and MC2 irises
• IMC flashed, good 0-0 modes
• 0-0 modes were used to align MC2 Trans
• this means that we have a known good IMC alignment that centers the beam on MC2 Trans
• strong 0-0 modes flashed in each MC2 Trans QPD quadrant at around 700 (raw signal)
• variations in the height of the flashes in all quadrants was 20-30 counts, which is around 5%
• beam from the PSL was monitored, and checked on MC1 iris more than once today, and it appears that later in the day something happened, because my last check of the beam showed that it was off in yaw
• IM3 required a pitch adjustment, and this was accomplished without removing the baffle, because the locking collar on the pitch adjustment screw wasn't tight
• tightening the collar required removing the IM3 SiC baffle
• the Viton remained stuck to the SiC when the baffle was removed, which made reinstalling the baffle easier, however
• the weight of the SiC baffle further adjusted the IM3 pitch, so there is a pitch slider actuation
• the locking collar could be put on the back side of the adjustment screw, which would potentially make pitch adjustable without removing the SiC baffle
• each time it's required that we remove and handle a SiC baffle the risk of having one shatter increases
• IM4 is in the same situation as IM3, the pitch adjustment screw and collar are not currently adjustable with the SiC baffle installed on the IM4 cage
• the flashing beam from the IMC is aligned to the PRM Trans and PR2 irises

(Kyle R, Gerardo M)
Right before lunch both feedthroughs were removed and replaced while all door covers were on.  We removed the old style feedthroughs and installed the new type (Accuglass PN100520) on BSC1 and BSC3 (flange F2, subflange 3 for both BSCs).  Both need to be leak checked.

WP7245

To complete the transition of the ISI Cartesian bias setting scripts from Perl to Python, today I edited all the MEDM files which call these scripts. In all cases the scripts are called indirectly via an xterm running a wrapper bash script. I changed the dimensions, font and colors of the xterm to make it more readable. Again I used ISI ITMY ST1 as my test system, returning the settings after I had finished.

J. Kissel

I've process several sets of data to show results of B&K measurements which characterize the new scraper baffles in HAM3 / HAM4, the MC2 scraper baffle (), the PR2 scraper baffle (), and the SR2 scrapper baffle (), all of which are assembled with viton built into the structure, so we expect very little high-Q features.

Attached are results from all three LHO baffles, in addition to comparing the same DOFs measured at LLO (though, LLO used a laser vibrometer, and only measured the response to 2D excitation in one direction).

It's difficult to make any broad sweeping statements about any of these baffles.
I would have naively expected that the PR2 and SR2 baffles from both sites would have similar resonant features in the comparable excitation + response directions, but they're all different. Similarly, the MC2 scraper baffle shows a different response. I could easily imagine the response being different because of the differing hit locations -- from the looks of pictures, Arnaud / Stuart hit the centers of big surfaces on each baffle (think excitation of drumhead modes of those panels), where Siddhesh and I were hitting the top corners of structures (think excitation of flag-pole modes of the entire structure). Also, the response sites were different between observatories: the laser vibrometer can directly measure (at least one) surface of each baffle, where as the accelerometer bolted to the table picks up ISI table resonances (i.e. the high Q features around 10-15 Hz which are the locked / HEPI cross-beam resonances).

If we're really looking to confirm that these are built identically, and have confirm that *all* resonances are damped to a sufficiently low Q, then we're going to need to standardize our measurements.

For now, all we can do is acknowledge what frequencies we see where, and hope the don't show up in the IFO's sensitivity!

For those who need more detailed information, I attach the data (zipped up in an archive that you'll need to decompress), and the script to process the data to make these plots.
 
Details of the measurements can be found in the following aLOGs:
H1 MC2 / PR2 LHO aLOG 39590
H1 SR2 LHO aLOG 39288

L1 MC2 / PR2 LLO aLOG 36908
L1 SR2 LLO aLOG 37020

After another marathon day in chambers, Fil, Richard, Travis, and I finally finished connecting the newly fabricated ITM ESD feedthru connections in-chamber and their subsequent testing (FRS Ticket 5033).  The testing, of course, was not straight forward and we walked around troubleshoot a few things here and there.  We struggled with the ITMX BIAS intermittently failing the HIPOT testing and continuity checks (see issues with this reported last year 27562).  We tracked down the issue to the pin at the other end of the cable we reterminated (and have not touched during this vent) which led to me disassembling the connector a bit and looking for shorting mechanisms.  I didn't find any, but upon reassembling the connector, things seemed to test fine.  Sigh.

Fil will likely post the full numbers above or below this alog for both ITMX and ITMY testing (which included HIPOT).

Meanwhile, the ground checks of the SUS cables that were checked on ITMX, ITMY, and the BS which failed a few days ago were fixed via a variety of reseating the connection fasteners at the feedthru end of the cable, remedying pinch points of cables in-vacuum, or resolving to have EE fix it somewhere on the outside.  Most of the cables had not been touched during this vent, with the exception of the ITMX PUM one which had migrated out of it's viton pad seat during the ITMX rebuild last month.

So, really, really we could do the BSC 1, 2, 3 closeout tomorrow.