J. Kissel, C. Gray, M. Nakano, G. Billingsley

We're getting started with cleaning our 1" and 2" optics for SPI. Corey uploaded *all* of our optics (50:50 BSs, 85:15 BSs, TFPs, HR mirrors, Lenses etc.) to ICS in prep, and I reviewed the work double checking that the ICS record information makes sense. For the HR mirrors, which were part of the 2025 large custom purchase order (C2500044) from FiveNine Optics (to be used by JAC, SQZ, the LLO TNT Lab, and SPI), he entered them into ICS with a key that used the DCC number that's physically etched into the barrel of the optic.

HOWEVER -- the DCC number etched on the barrel of the optic is E1900393 -- E1900393. See attached picture. 

That drawing number is for the coating spec of 0-25 deg AOI HR mirrors.

The physical coating spec we want, was provided, and bought was for 45 deg AOI, i.e. E1900392 -- E1900392 (one DCC number lower).

So these HR optics, coated with E1900392 spec, bought with C2500044, which have vendor run numbers 1895 and 1897, have the incorrect DCC number for the spec etched on the barrel.

If you head to the purchase order, C2500044, and look at the FNO_4787-1.pdf attachment, it clearly states (twice!)
    "[...] per drawing E1900392-V2. Serialization per E1900392-V2."

However, if you then *read* E1900392-v2, section 8 states equally clearly
    "Each optic should be serialized and marked with the following code/description:
        1" optics: E1900393-v2-01 S/N:01 HR1064+532
            with incremental S/N: 01, 02, 03, ...
        2" optics: E1900393-v2-02 S/N:01 HR1064+532
            with incremental S/N: 01, 02, 03, ..."

Thankfully we know the coating is the correct E1900392 coating --
(1) The PCAL team confirms via measurement at 45 deg AOI, that these have transmission at the level of ~5e-5 W/W, so these will serve excellently as HR mirrors at 45 deg AOI. See LHO:86699
(2) The vendor's data, posted to C2500186, (Even though the run numbers listed on the first page of the data for the First Batch are quoted as "V2-2895" and "V2-1897" we know the run numbers are V2-1895 and 1897 from what's written on the containers the optics came in; see attached picture) show figures with captions indicating the data is from AoIs of 38, 45, and 50 deg, a reasonable range of AoI's to test for a 45 deg AoI mirror; and conversely no measurement of anything at AoIs less than 25 deg, which would be what one would report for a coating that's spec'd with the *actual* E1900393 spec.
(3) The E1900392 spec specificies a 45 deg AoI.

So, now we just have to figure out how to keep track of this information when we're in the lab / in the chamber, 5 years later, and the optics are no where near their cases and a brand new person is using the optics. C'est le vie!

One recommendation from the June 6-9 CDS Face-2-Face meeting was that the teststands need their own alog as work get geared up for post-O2 upgrades. Keith and Dwayne have created the new alog at LLO:

Test Stand ALOG

You should not see any more X1 alogs in this alog from now onwards.

The optical timing distribution system in the staging building is no longer in sync with the master timing in the MSR.  Because of this, the GPS time of the models running on the test stands is off by a second or two.  This should be fixed at some point when it is convenient to shut down the models and troubleshoot the system.  Until then, the system should work so this repair is not urgent.

This affects both seismic and suspension test stands in the staging building.

I have restarted the DTS, triple test stand, quad test stand, and seismic test stand.  The test stands in the staging building have only the IOP model and daqd processes running, so the users will need to start the appropriate models for their tests.

Remove oldest frame files from tripleteststand and seiteststand2 to reduce file system usage to safe level. (general maintenance)

The GDS software (diaggui, awggui, foton, ezca*, etc) has been updated on the suspension and seismic test stands to include modifications for the June 30 leap second.  Also, the diaggui and awggui channel selection menus have changed to include 6 levels of hierarchy in the channel selection.  This should make selecting channels easier as the very long menu with the tiny scroll bar has been replaced with hierarchy.

Manually removed oldest frame files to reduce /frames disk usage on tripleteststand, bscteststand2, and seiteststand2. (Routine maintenance)

Both X1 test stand computers have been restarted in the staging building following a timing system interruption to move AC power for the timing master.  All previously running models have been restarted.

Due to a timing system interruption at the master fanout, the suspension and seismic test stands needed to be restarted.  Models were restarted, but no BURT restore was performed. 

(Mark & Slim from Apollo)

Just to give an update on the Staging Bldg Cleanroom issues noted last month.  Last week, the flimsy castors (actually, it was just poorly designed cleanrooms---weak castors not installed securely in thin boxbeam legs) were replaced with much beefier replacements (after seeing cross-section of legs, still wish they were thicker/stronger like the VEA cleanrooms).  Photos are attached.  These were replaced on the two (of four) cleanrooms we move the most down there.

(obviously both of the attached photos should be rotated clockwise 90deg, seems like the alog doesn't like my photos!)

The suspension and seismic test stands have been started after the power failure of this morning.

Tuesday Jan 10 between 17:45 and 18:30 PST, bscsteststand2 and seiteststand2 in the staging building were rebooted and the models that had been running were restarted to correct timing.  This was done as a result of moving equipment that supply timing in the MSR, which interrupted the 1PPS timing to the staging building.  The timing signal is now supplied directly from the master fan out in the MSR.