HAM2, RZ = -246urad

HAM3, RZ = -166urad

WHile the lower stage AOSEMs were pulled back over the last few days on SRM, I did a quick look at the dark offsets.  Of course, the "pretty" OSEM offset script wouldn't work due to many years of CDS software tool upgrades since it's last uese (thanks Jim for tyring), so I just ran them by hand, and plugged them into the associated MEDM screens:

   M2

The OSEM strengths look to be decaying a bit.

Also, I set the pitch and yaw alignment sliders both to 0 since it is getting a fresh start.  (Bias sliders were P=-666.3, Y = 927.4)

Today Travis and I used the ergo arm to install the new ITMx optic (ITM07) into the QUAD lower structure parked in the biergarten.  Thanks in advance to Jeff K for the photo shoot session he performed during this (see attached).  We put a few more laser barrier walls in place and firmed up the layout of the space so that Jason can start loading in and setting up IAS survey equipment needed for the fiber welding.  We also added the temporary "back stops" tooling fixture to the AR side of the ITM optic since the "real" stops are on the reaction chain structure across the room.

Note - prior to installing the new test mass, Travis tidied up the PUM horns, and I wiped the PUM and the entire structure to remove particulate likely generated from the disassembly of the suspension (mostly metal flakes observed in the wipes and on surfaces).  First Contact is still on the HR and AR optic surfaces of ITM07.

Thanks to Bubba and Mark for craning the ergo arm and the engine hoist out of the biergarten in order to help us with some tight real estate issues.  Also thanks to Christina and crew for cleaning all of those black laser panels yesterday.

Gerardo, Arnab, Chandra

Today we installed the TMDS flanges & mini gate valves on BSC 1,3 chambers. Installation on BSC 1 was straight forward, per drawing D1500174. Installation on BSC 3 is rotated down 7.5 deg from the designed clocked orientation due to existing fixed bolt pattern on door port. Calum and Eddie verified in SolidWorks that the angle of attack is still effective in this orientation.

Robert pointed out that remote access ssh sessions were still showing the text that operator intervention is needed to log into LHO CDS. This is not the case outside of observation runs and I have corrected the text accordingly.

The ASC, SUS and ISI model changes required a DAQ restart, which I did in two stages.

The first DAC restart at 10:34 followed restarts of the models h1asc, h1ascimc, h1isiham2. The ASC restarts were to resync the models with the modified H1.ipc file for the SHMEM IPC channels between h1ascimc (sender) and h1asc (receiver).

I took the opportunity during this restart to reboot h1tw1 which had been running in excess of its 208.5 day limit.

The second DAC restart at 11:33 followed the restarts of the models h1isiham[3,4,5], h1sus[mc2, srm].

I renamed the partial second trend files for both restarts to correct the NDS1 second trend plots which span this time region. For those interested, the attached plot shows a two hour second trend of a model's cpu usage before, during and after this frame file correction. The left plot shows the data dropping out after 30 minutes as an incorrect channel is substituted. The middle plot shows the 30min mark fixed (replaced with a 10 min gap) but a data drop at the 90 min mark. The right plot shows contiguous data excpet for the two 10 minute gaps.

J. Kissel, D. Barker
ECR: E1700123
FRS: 7844

As one of the last steps to decommission the HAM ISI optical levers, Dave and I have removed the top-level ADC calls and IPC communication between 
    h1susim > h1isiham2
    h1susmc2 > h1isiham3, h1isiham4
    h1sussrm > h1isiham5

We have not yet made the final change, removing the inputs and corresponding processing guts from the isihammaster.mdl. We'll coordinate that removal with LLO.

(No screenshots to show, since this only involved the removal of parts.)

Attached are the VPW desiccant plots with this month's added data.  Nothing out of the ordinary shown.

   Ran check script to verify all dust monitors in the LVEA are running. Plot below are the particle counts for the past 7 days. All cleanroom counts look good. The big spike in HAM6 is associated with the door removal. The counts quickly drop back down to near zero shortly after the door removal is finished. 

   ** The monitor at HAM5 appears to have taken a tumble and shows signs of damage. I am going to swap it out as the counts from the 0.5um particles are a bit suspect. 

This morning I completed the weekly PSL FAMIS tasks.

HPO Pump Diode Current Adjust (FAMIS 8442)

With the ISS OFF, all operating currents of the HPO pump diode boxes were increased by 0.1 A; the changes are summarized in the below table.  A screenshot of the PSL Beckhoff main screen is attached for future reference.

The operating temperatures of the diode boxes were not adjusted.  With the ISS back ON, the HPO is outputting 153.7 W.  This completes FAMIS 8442.

PSL Power Watchdog Reset (FAMIS 3670)

I reset both PSL power watchdogs at 16:19 UTC (9:19 PDT).  This completes FAMIS 3670.

Bubba G., Mark D., Kyle R. and Rakesh K.  

"Bumbped" non-suspended component of NE HEPI when N. door separated from HAM6 

Both the crystal and diode chiller filters in the Chiller Room (e.g. not under the table in the PSL enclosure) look good. No discoloration or notable debris observed. Closing FAMIS #8301. 

   Added 300ml water to Crystal chiller. Diode chiller water level light is not on; therefore did not add additional water. Both filters look good.

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.

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.