WHAM2--This platform had not been unlocked for some time, ~Nov 6 when Jim did TFs.

After unlocking, balanced the tilt as close as possible to the locked position of the last few days.  Limited mass choice and position only allows getting so close.

After Jim ran TFs today, the free hanging positions are 41, 7, & 96 urads for RX, RY, & RZ.  The positions while locked the last few days have been 43, 8, & 82 urads.  So the Tilt are very close but the RZ difference is some 14 urads. Sadly, we can't do anything about the RZ now.  The solution should be that when we first vent, give SEI some time to adjust the lockers to minimize this--probably a day or two at least.  And, as the payload changes and the platform is climbed on, this free hanging/locked position difference will change further.  We can do two things now going forward, servo RZ to the locked position which might make the ISI Isolation loops turn-on a bit touchy, or, as SEI would prefer, servo to the free hanging position and we'll see if IO notices/cares.  Alternatively, if the ISI is touchy and IO does care, we can twist the platform with HEPI--which we are perfectly happy to do.  For what it is worth, when Jim had the platform unlocked for the TFs in early November, the RZ position was similar to now.

For WHAM3--Comparing the locked position over the last couple days to the last couple months, the tilts and RZ are consistent: -6, -6, & -5 urads for RX, RY, & RZ.  The current now free hanging positions are -9, -8, & 5 urads.  So, similar to HAM2, the RX & RYs are within a few urads but the RZ has an ~10 urads twist when unlocked.  Like HAM2, will let IO decide if this twist is too much and if so, SEI will decide if we can tolerate it on the ISI or if it needs to be offloaded to HEPI.

Attached photos show a couple of bundles of cables on the +X-Y and -X+Y corners of the ISI Stage0 of HAM2 heading to the chamber feedthrus.  HEPI won't have any difficulty dealing with it now but may be an issue if we attempt any real isolation--could complicate the TFs.  Maybe these cable bundles could be done differently if it seems to be a problem.

Carlos, Dave:

Carlos patched and restarted cdslogin this morning. I restarted the cell phone notification system at 13:09 PST.

The DAQ was restarted today to install several changes:

new h1asc code (see alog 39868)

latest H0EDCU_SAFETY.ini

new nds configurations

The NDS reconfigurations are:

h1nds0: New daqdrc file to serve h1ldasgw0's archived raw minute trends from its SATABOY RAID.

h1nds1 (the default nds): now NFS mounts h1ldaswg1's /frames-1 and /trend-1 exports (was temporarily serving h1ldasgw0 while the E18 upgrade was progressing). Also new daqdrc file to serve h1ldasgw1's archived raw minute trends from its SATABOY RAID.

After the restart the EDCU did not connect to many of h1ecaty1's EPICS channels. Remember that the hourly autoburt machine started having connection issues to h1ecaty1 over the weekend. The autoburt machine was rebooted today, which did not fix its connection problems. This coupled with the EDCU issues leads us to think a restart of the IOCs on h1ecaty1plc[1,2,3] is needed. We will see if this can be scheduled pre-holidays.

Continuing from yesterday's afternoon closeout festivities, this morning Travis and I finished pulling the rest of the HAM2/HAM3 HSTS/HLTS First Contact and spot cleaning the optic edges.  We did the usual N2 top gun blow during and after the pulls.  We double checked tables for extra parts and tools, and finished laying the 3" and 1" witness optics and wafers.  We wiped tables in lots of places.  There are still a few particle-looking spots on some of the HR surfaces but they do not want to move so we had to leave them behind.

While looking at TFs we re-discovered that the PR3 Pitch Transfer Function looked a bit odd, peaks were in the correct place but the signal was steeper in places than expected.  This was due to a broken relay on the BIO chassis.  Fil swapped the unit and things looked better.

Meanwhile, the PR2 Pitch TF also exhibited this and was tracked down to a "stuck" BIO state which was fixed by unplugging and reseating the cable somewhere in the external chain. 

Kissel and Travis are finishing up the suite of TFs for all 6 of these suspensions (IMs were done yesterday 39845), to be posted in a bit.

Jim and Hugh finished ISI floating, balance tweeks, and TFs, logs pending.

Sign-off sheets were completed.  Vern will file to the DCC after the holiday.

Bubba and crew are starting top put doors on, beginning with HAM3 then to HAM2.

Pump down will likely happen early next week after we let the purge air dry things over the holiday weekend.

WP7230

Richard, Sheila,  Marc, Dave:

The ADC inputs to h1asc were remapped following the addition of the first ADC.

The PSL Bulls Eye photo-diode channels were remapped as-per E1600381 drawings. The 9pin DSUB cable for this PD was moved on the 6th AA chassis from the last 4 channels to the next-to-last 4 channels. The model's four segments were remapped to be in segment order and not ADC channel order (see attachment)

After the h1asc model was restarted:

the DAQ was restarted

the Bullseye Input Matrix was modified to switch SEG1 and SEG3 settings. We think the SEG2,4 settings are still correct.

the ISC_CUST_BULLSEYE.adl medm file was modified to correct the segment drawing (see attachment)

While CER work was ongoing to SUS coil driver repair, the front end systems h1sush2a and h1sush2b were glitched. On h1sush2b all models stopped running. On h1sush2a the IOP model continually ran long, with ADC and TIM errors which would not clear. All models on both FECs were restarted.

Hugh unlocked HAM3 this morning after SUS people finished in there this morning. I've taken dtt tfs and they look ok. Hugh reported purge is high, so tfs look a little ratty, but resonances seem clear. 

• Crystal Chiller topped off with 250mL of water.
• Diode Chiller OK
• Checked Filters and they were OK.
• Closing Out FAMIS # 6554

At approximately 12:33 UTC (4:33 PST), the 35W FE power watchdog tripped, causing the HPO power watchdog to trip ~6 seconds later (see 1st attachment).  Looking at the laser power for the 35W FE shows the MOPA and the NPRO lose power at the same time, thereby causing the watchdog trip (2nd attachment; the little bump in H1:PSL-OSC_PD_AMP_DC_OUTPUT is simply residual light from the still operating HPO hitting the PD, it goes away once the HPO power watchdog trips).  It is unclear what caused the FE to lose output power in this way.  Putting all the signals from the 2nd attachment on one plot and zooming in, it appears the watchdog tripped before the FE lost output power (3rd attachment).  Possibly a glitch in the PSL Beckhoff software?

The PSL was restarted without issue.

Nutsinee, Terry, Daniel

We installed all the in-air coax cables for the squeezer that were on hand. Six weeks after the promised delivery date, it still seems ~20% are missing due to being back ordered...

Fil et al. started laying down the long D-sub cables.

Today, in HAM2/3 we:

• Painted FC on MC1, MC2, MC3, PRM, PR2, and PR3
• Pulled FC on PRM, PR2, and PR3
• Unlocked PRM, PR2, PR3
• TBC

While installing the north door on BSC 1 this morning, as we were inspecting the flange,  I saw what appeared to be a rust spot on the flange in the sealing area of the inner O-ring at roughly the 5 o clock position (facing the BSC from inside the biergarten). 

I wiped, rubbed, and wiped again. I repeated this several times.  There was no drag felt on the alcohol wipe, or on my clean gloves, no "rust residue" or any other foreign material came off on the wipe or glove. 

I put a piece of tape on the bolt head located near this position and showed Kyle the picture. Kyle said he would make a comment on this post.

R. Savage, J. Oberling, J. Driggers, S. Dwyer, P. King (via phone), R. McCarthy, F. Clara

This morning we completed the initial in-air alignment of the ISS 2nd loop PD array.  Recall from yesterday afternoon, we did not make much progress in the alignment.  This was due to the signals out of the PD array dropping for apparently no reason.  After some intial investigation it was decided to re-convene this morning, this time with Rick helping out (as he has worked with the ISS PD arrays extensively).

Some notes from this morning's work:

• The ISS 2nd loop transimpedence amplifier chassis was OFF, thereby preventing us from seeing any signals from the 8 PDs in the array.
  • After talking with Peter, it is unclear if this chassis was ever turned back ON during the vent.
  • This does not explain the issues we were having seeing the beam yesterday afternoon, as the QPD in the ISS 2nd loop array enclosure is read out via a different chassis (per P. King).
  • This chassis, which was a prototype installed before O2, was swapped with a tested and approved production version.  The swap was performed by R. McCarthy and F. Clara.
• We discovered that to really see the beam entering the array, we needed to re-install the temporary HWP after IM1 that Sheila removed yesterday afternoon.
  • We talked to both Ed and Cheryl and were told that this was necessary due to a temporary HWP placed at the base of the PSL periscope.  This HWP was placed in order the purposefully send the wrong polarization into the IMC, I believe to make the IMC flashes easier to see (I may be mis-remembering what I heard, if this is incorrect please correct me in the comments).  This temporary HWP in the PSL enclosure will be removed.
  • This does explain the issues we were having in seeing the beam yesterday afternoon.  As soon as the temp HWP was re-installed in front of IM1 the beam was once again obviously visible on an IR card and the ISS 2nd loop signals were greatly elevated.
• To increase the rate of IMC flashing, we injected a small sine wave (via awggui; f=0.1 Hz, amplitude=1, gain=30) into the L path of MC2.  This made seeing the flashes on an IR card and via the PD array signals much easier.

This taken care of, the beam was then centered on the PD array enclosure input aperture using the first steering mirror (located on the -Y side of the table), and then the signals maximized (to the best we could achieve with a flashing IMC) using the second steering mirror (located on the +Y side of the table).  This was iterated several times until we had a strong signal on all of the PDs and the array enclosure QPD, and the beam was centered on the entrance aperture of the array enclosure.  This is more than sufficient for the in-air alignment; the PD signals will be maximized when the IMC is once again locked (after the corner station is pumped down).

WP7252:

During today's CDS meeting Rolf reported that moving the fast front-end computer's IRIG-B card away from slot-1 resolved timing issues on his test system. To try this out on a production system, this afternoon I moved h1susey's IRIG-B card.

Recall (alog 39361) that on 09nov2017 I had moved h1susey's OneStop from slot-2 to slot-5 as part of this investigation. Today I returned the OneStop back to slot-2, and moved the IRIG-B card from slot-1 to the newly vacated slot-5.

It was a messy restart of h1susey. After taking it out of the Dolphin fabric and issuing the poweroff command, the OS got stuck trying to umount NFS after apparently disabling its network ports. I had to power down using the front panel button, knowing that this would most probably cause a Dolphin glitch. Sure enough, on restoration of power the EY dolphin fabric glitched, requiring a restart of models on h1seiey and h1iscey. EY is now back in operation.