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.

Greg, Thomas, Fil

In order for Greg to do some rework on the viewport enclosure assembly (D1101627), we moved the tables back about one foot after Fil disconnected all the cables.  We've removed the housing and placed a yellow cover on the viewport.  We then taped the hole of the table enclosure with ameristat.   Both tables are ready to be moved to get the discharging equiptment installed.

FAMIS #7458

Laser Status:
SysStat is good
Front End Power is 35.91W (should be around 30 W)
HPO Output Power is 153.5W
Front End Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 2 days, 12 hr 33 minutes (should be days/weeks)
Reflected power = 23.31Watts
Transmitted power = 49.63Watts
PowerSum = 72.95Watts.

FSS:
It has been locked for 0 days 8 hr and 10 min (should be days/weeks)
TPD[V] = 3.246V (min 0.9V)

ISS:
The diffracted power is around 2.2% (should be 3-5%)
Last saturation event was 0 days 8 hours and 10 minutes ago (should be days/weeks)

Possible Issues:
PMC reflected power is high

Summary:  After the July 5th earthquake, we had excess noise, some of which can be explained by charging of the optics possibly by hitting earthquake stops, in particular couplings from the ISI to Darm which could be explained by electrostatic forces between the cage (earthquake stops or image charges in the conductors of the cage), and a 1/f^3 noise which was reduced by discharging.

There is nothing really new in this alog, but things which have not been ploted and posted together.  In all of the plots I am posting here, I have removed jitter as witnessed by the PSL bullseye and the IMC WFS DC signals by selecting the jitter channel with the highest coherence at each frequency, estimating that DARM noise due to jitter at that frequency to be sqrt(coherence)*DARM ASD, and subtracting that in quadrature from the DARM ASD.  This doesn't perfectly get rid of the jitter, which varied between different times in these plots.

The first attached plot shows DARM spectra before and after the EQ, with the additional noise shown in yellow.  Also shown are the noise projections for the new ISI to DARM couplings which were introduced most likely by charging of the EQ stops which happened during the earthquake, which is about an order of too small to explain the amagnitude dditional noise. 

The second plot shows a comparison of the noise before and after discharging (at both end stations), with some lines with different slopes drawn.  Using Rai's charge hopping model (G1401153) you can roughly estimate that the surface charge density removed by discharging both test masses was 4.4e-13 C/cm^2, however, the charge was likely localized and if it came from contacting an EQ stop the EQ stop would also be charged. The coupling from ETMX ISI to DARM was also removed by the discharging, which can explain the noise improvements around 70Hz in this plot.  ITMY was not discharged.

The last plot is meant to show that there is still a lot of noise from 30-60 Hz which was added at the time of the earthquake, which has a slope shallower than the 1/f^3 predicted for charge hopping but cannot be explained by the coupling to ISI motion.

Field cabling to the TCS tables have been documented and disconnected. The following items were powered off prior to disconnecting cables:

1. Power to the TCS racks - DC Supply Sequencer
2. High voltage power supplies in CER mezzanine
3. High voltage power supply in Mechanical Room mezzanine
4. TCS chillers

The GDS broadcaster had frozen up Saturday morning, it required a front panel RESET button switch to reboot it.

This is a gentoo machine which had been up for 211+ days, and so froze due to the 208.5day-bug.

Reviewing the other 2.6.35 DAQ machines, h1tw1 has been running for 266days, so could crash at any time. I'm scheduling a reboot of this machine for tomorrow's maintenance. All other machines are well within the 208.5 limit.

IM OSEM values, zero alignment offsets, urad and counts, and IM_ALL screen, also IMC current alignment (not yet flashed)

Vent work for week of 10/02/17 to 10/06/17

There is evidence of some Beckhoff glitch that is visible. Oscillations in environmental plots are attributed to environmental controls being on for long periods of time with multiple incursions due to ongoing IO work. Chiller plots look a bit odd and have been brought to the attention of Jason O.

Amidst other in-chamber preps for next week and beyond, Travis and I were able to get into the biergarten cleanroom to separate the main and reaction lower chains of the ITMx.  Both are sitting on their trolly stands.  The ITM03 (old ITMx) was removed from the structure with the ergo arm and secured in it's "cake tin" fro transport back to CIT for forensics studies.  We've prepped the space and equipment in prep to build the laser enclosure.  Next week we'll load the new ITM07 and start setting up IAS equpiment to set the masses up for fiber welding later in the weld.

For the record, we also inspected the reaction chain top mass blade that had the wire broken off yesterday and found it to be in great shape, no visible marks and all other attachment points and clamps in proper order.

J. Kissel

After SRM's surrogate optic was replaced by the real thing yesterday (see LHO aLOG 38833), it was rebalanced and leveled this morning. With it's lower stage OSEMs still completely backed off, I ran a set of health-check transfer functions to confirm that the new mass is suspended well and that the dynamics are currently free and haven't changed much from the surrogate. I'm happy to report, the transfer functions look wonderful. I attach plots of its Top to Top (M1 to M1) transfer functions by itself (with more DOFs shown in detail) and a before vs. comparison between the composite and monolithic masses for both L1 and H1.

Nice work install team!!

All data and changes to transfer function plotting scripts have been committed to the SusSVN:
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/SAGM1/Data/
    2017-09-29_2216_H1SUSSRM_M1_WhiteNoise_L_0p01to50Hz.xml
    2017-09-29_2216_H1SUSSRM_M1_WhiteNoise_P_0p01to50Hz.xml
    2017-09-29_2216_H1SUSSRM_M1_WhiteNoise_R_0p01to50Hz.xml
    2017-09-29_2216_H1SUSSRM_M1_WhiteNoise_T_0p01to50Hz.xml
    2017-09-29_2216_H1SUSSRM_M1_WhiteNoise_V_0p01to50Hz.xml
    2017-09-29_2216_H1SUSSRM_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/MatlabTools/
    plotHSTS_dtttfs_M1.m

/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/SAGM1/Results/
    2017-09-29_2216_H1SUSSRM_M1_ALL_TFs.pdf
    2017-09-29_2216_H1SUSSRM_M1.mat

/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/MatlabTools/
    plotallhsts_tfs_M1.m

/ligo/svncommon/SusSVN/sus/trunk/HSTS/Common/Data/
    allhstss_2017-09-29_Phase3a_H1SUSSRM_NoDamping_ALL_TFs.pdf
    allhstss_2017-09-29_Phase3a_H1SUSSRM_NoDamping_ALL_ZOOMED_TFs.pdf

I installed the FLIR Atlas For MATLAB IR camera interface SDK on the H1TCSFLIR computer. I've not been able to successfully use it to connect to a camera. However, so far it doesn't prevent the ResearchIR software from connecting to the camera - so that's a good start.

TITLE: 09/29 Partial Day Shift: 17:30-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Planned Engineering
LOG:

Covered from 17:30 - 23:00 UTC

17:56 UTC Corey out. Keita can transition LVEA to laser hazard.
17:59 UTC Ed out.
18:09 UTC Keita done transitioning LVEA to laser hazard.
18:32 UTC Alastair starting run along X arm.
19:07 UTC Greg G. to LVEA.
19:20 UTC Cheryl, Keita, Ed, Corey: align beam in PSL enclosure to HAM2 and IO work on HAM2 and HAM3.
20:36 UTC Travis to HAM5 and HAM6 area. Rearrange cleanrooms. Radius of curvature actuator. Not in chamber.
21:28 UTC Travis done.
22:10 UTC Filiberto and Peter to mid Y to pick up power supply.
22:22 UTC Cheryl, Keita, Ed, Corey back to HAM3.
22:44 UTC Aidan to LVEA to check if the X arm CO2 thermal imaging camera is on.
22:50 UTC Aidan back.
22:59 UTC Kyle taking visitors around LVEA.

I've set Guardian to DOWN for the two TCS lasers.  They can now be keyed off at the controller, and the tables can now be moved out of position for the TMDS install work.

As I reported in 38821, the valved out section of the corner station plumbing showed a curious pressure trend.  And this behavior continues.

The attached plots shows 50 hours where you see the output pressure of pump station 1, the supply pressure on the main trunk line (mainsupply) and the two sensors on the distribution manifold beneath BSC2 SUP & RET.

At the start of the plot just before the start-up pressure spikes, the valving to the LVEA was changed to put the Pump Station Array into recirculation mode. This is when the BSC2 pressure sensors started their trend up.  On Wednesday towards the end of the day, the pump stations were stopped but the BSC2 sensors continued their trend.  Yesterday, the pump stations were restarted to continue the recirculation.  One can see that the behavior of the BSC2 sensors was the same as the night before when there was no pressure at the pump stations.  The PSs are again shut off now and the BSC2 sensors continue  unabated.  I predict this cycling will continue until the valving is changed back to the operations configuration.

FYI, all the actuators in the LVEA are valved out (or bypassed) so the entire LVEA plumbing is one big U, complicated at the bottom end with lots of branches and loops up to the BSC actuator bypass valves.  While there are a few top point air bleed out ports, I believe these are all closed and not leaking.

We guess it has to do with siphoning around in the closed system but 20+ psi seems too large to be explained by the height of some of the plumbing above the pressure sensors at BSC2.

Now done with the local recirculation and will start filter changing next week.

J. Kissel

H1 ISI HAM5's tuned mass dampers have been retuned to match the first bending mode of HAM ISI blade springs post spring-tip-damper install (~139 Hz). Attached are the results for all three TMDs (pg. 1: before and after tuning; pg. 2: after tuning, compared against the blades).

The retuned TMDs will be installed at the earliest convenience of Jim and Hugh.

Details of the measurement setup are as described in LHO aLOG 38741.

This afternoon, Travis and I finished the necessary part removal to drop the Lower structure and it's 6 masses from the ITMx suspension in BSC3.  Mark D helped us run the arm and the elevator controls to bring the unit out.  We had one small hiccup where we accidentally yanked a wire off the reaction chain top mass which was snagged on UIM hardware.  We'll have reinspect the this top mass and then hit the lab to rebuild the wire segment.  Win one for poor lighting, not have an infinite supply of eyeballs and snaggletooth UIM structure hardware sticking up during this procedure.  Thanks in advance for Jeff K's pictures likely coming to the alog.

In other news:

Jeff B and I were able to successfully* swap the SRM surrogate mass for the full SRM optic SRM-06.  I first contacted the HR surface prior to installing it.   We measured weights prior to install:

SRM-06   2885g  (2886g with the FC sheet)

Surrogate   2905g

Jeff added 20g to the middle mass in order to compensate for the loss of weight to the SRM optic stage.  Jeff and Hugh are currently working on setting pitch and roll.

*Successfully:  the optic was not damaged, the wires of the suspension were not broken, the optical lever we were attempting to use was only mostly compromised.  While trying to sight the far side wires around the prisms during the install, I rolled a shoulder into the temp oplev beam staged on the table - even though it was placed as far out of the way as possible.  Darn cramped spaces!  Oh well, the pitch info from it is still useful and we have other ways to course align P/Y.  Final alignment will happen early NOV with PSL beam.

IO has continued efforts in HAM2/3, still at it now...

Hugh finish install of needed feedthrus on HAM5.