Ops Summary

- Thomas and Apollo crew, stagging of ETMX ACB components into BSC09.
- High dust counts @ X-End, called staff and notified them, >0.3u @ 4000.
- Kiwamu and Pablo, work in OSB optics lab while on laser hazard.
- Jeff, X-End station, ETMX preparation for installation.
- PEM crew, pulling cables in the CS-VEA and Y-End VEA.
- Dave and Hugo, DAQ reboot.
- Kyle, open GV2, part of WP#4148.
- Fire drill for LSB and OSB, 2:00 pm local time.

Disconnected aux. pump cart from BSC2 annulus

Prep ETM-X for Installation

Jodi F and Jeff B

   Rechecked and adjusted the stops on ETM-X in preparation for moving the cartridge into the BSC. Engaged the blade stops on the UI mass and three of the Top Stage blades (could not get to the fourth Top Stage blade stop) and tightened all EQ lock nuts that were accessible. 

   Installed the metal face covers over the optics and secured their locking nuts. Removed the wafer holder from the bottom of the Quad.

   With Jodi's help, covered both the Quad and the TMS suspensions with C3 Quad bags. 

ISC electronics work in R1, R4 and C4.

(Alexa, Daniel)

ISC electronics work in the corner:

• We installed an additional distribution amplifier into rack ISC-C4 slot 6 (79.2MHz).
• We installed an additional distribution amplifier into rack ISC-R1 slot 36 (71MHz).
• We reshuffled R1 to correspond to the most recent drawing D1001460-v11.
• We moved the no-longer needed D-sub breakout panel from R1 to R4 slot 18.

We are waiting for the 79.2MHz RF source in rack C4, the two additional frequency-difference dividers in R1, the summing node and SUS satellite amplifier in R4, as well as the corresponding cabling.

Angle adjustment of HWP1 for HAM1

[Pablo and Kiwamu]

 We adjusted the rotation angle of HWP1 which is an in-vac half wave plate in HAM1 to convert the polarization of the REFL beam from S to P.

We took HWP1 out of the HAM1 chamber and brought it to the optics lab because it is much easier to do it in a lab rather than in a chamber. Then we setup a 1064 nm fiber laser and some optics in the optics lab to adjust it. The first picture below shows the setup where we used two PBSs. We minimized the amount of S-polarizing beam by looking at the power of the rejected beam from the second PBS. At the PBS we got a rejected (S-pol) beam of 0.5 uW out of 10 mW incident (S-pol) beam on HWP1. The last picture shows the rotational angle of HWP1 after the adjustment. We locked the rotational part so that it won't rotate any more.

 

strange light

ETMX Install Prep

Randy craned the ACB Box over the beamtube and helped Thomas load it on a truck and they transported it to X End. Bubba and I helped them unload the box and take the outer layer of wrappings off the box, the suspension and the tooling. Next, we moved all those items to the middle bay where the layers of CPStat were removed. Once the CPStat was removed, we transported the C-3 covered structures into the VEA. Randy, Scott, Tyler and Thomas got fully garbed and went into the chamber cleanroom: Randy and Scott on the work platform and Tyler and Thomas in the chamber. Bubba used the newly-designed lifting plate to crane the box into the chamber through the dome opening. This seemed to work very smoothly and eliminated the need for man-handling the heaviest part of the ACB. Randy and Scott came down off the work platform and helped Bubba and I man-handle the ACB suspension and tooling into Thomas and Tyler.

Once all the ACB parts were in the beamtube, the Apollo crew started getting the chamber cleanroom ready for cartridge install. The handrails were removed from the work platform and handed out for storage on the E-module. The curtains were rearranged and the cleanroom position adjusted to allow freedom of movement. (Apparently, the wheels did not move very easily so there will be some vinyl repairs...)The cleanroom was half-way lowered by lunchtime and will be all the down by the end of the day.

Jeff and I worked on the Test Stand, Work Space and Staging cleanroom curtains so that they are ready for the moves associated with clearing the cartridge for the install pick.

BSC-ISI Models updated - ITMY, ETMY, ETMX

Dave, Hugo,

New channels were added to the science frame yesterday (LHO aLog #7849). Those channels are defined in a simmulink block called GND_STS. The GND_STS block was copied from gnd_sts_library.mdl and pasted in the BSC-ISI top level models of ITMY, ETMY, and ETMX, as intended. The gnd_sts_library.mdl contained one GND_STS block for ITMY, one for ETMX, and one for ETMY. Those three blocks carried the same name, with different content. Yesterday's work indicated that the RCG got confused by the multiplicity of names, and picked the wrong GND_STS block from the library, to generate the .ini file, which lists the channels to be recorded in the science frame.

Yesterday's solution was to rename each of these GND_STS block, within gnd-sts_library.mdl, so they would have distinct names. Doing so, impacted the names of the channes saved in the science frame:
   GND_STS blocks were renamed as follow:
        - GND_STS_IY, for the one to be pasted in h1isiitmy.mdl
        - GND_STS_EX, for the one to be pasted in h1isietmx.mdl
        - GND_STS_EY, for the one to be pasted in h1isietmy.mdl

GND_STS channels in the Science Frame were then (in red, the diffence whith what was intended by T1300742):

 

We found a workaround this morning, so the ground STS channels would be named correctly in the science frame:
    - We split gnd_sts_library.mdl into 3 distinct libraries:
        - gnd_sts_library_IY.mdl   (which contains the GND_STS block for ITMY)
        - gnd_sts_library_EX.mdl   (which contains the GND_STS block for ETMX)
        - gnd_sts_library_EY.mdl   (which contains the GND_STS block for ETMY)
    - The GND_STS blocks were copied, and connected, into the relevant models ( h1isiitmy.mdl, h1isietmx.mdl, h1isietmy.mdl)
    - We checked that the GND_STS blocks we pasted were linked to the correct simmulink libraties (gnd_sts_library_IY.mdl, gnd_sts_library_EX. mdl,gnd_sts_library_EY.mdl)
    - BSC-ISI models were recompiled for ITMY, ETMX and ETMY.
    - GND channel names were checked in the science frame. They are now correct (see below)

Bottom line:

1. One should not expect RCG to pick the right simuling block, if this block has clones (same name) within the library it comes from.

2. The Seismic GND_STS (Ground streckeisen seimometers) channels are now recorded with the correct name in the science frame.

BSC9 Report Posted

In the DCC E1100849.

ETMX ACB

Apollo, Jodi, Thomas

All large tooling and parts have been stored in the tube adjacent to BSC9, awaiting the cartridge install.

Valved out RGA from HAM3, valved-out YMB turbo, valved-in IP5, 1 and 2, opened GV2

Continuous RGA data collection 

h1lsc updates

After a third ADC card was added to the h1lsc0 I/O chassis (alog 7842), I edited the h1lsc model as follows:

• added a DAC part and a third ADC part
• a few ADC/DAC channels were added or rewired according to T1100472-v10
• and a few ALS parts were added or renamed accordingly
• ALS-C_REFL_DC_ERR is now summed into the LSC input matrix
• added Beckhoff communication link (grounded for now)
• added iscex IPCs
• updated IMC and PSL blocks to match LLO (the LSC block is still divergent)

The new model has been compiled, started, and checked into SVN.  Its MEDM overview, safe.snap and filter files will be updated and checked in tomorrow.

HAM1 in-vac work : installation on the west side

[Alexa, JoeG, Paul, Kiwamu]

 Today we mainly installed the optics on the west side (which is close to ISCT1) in HAM1 and placed all the optics in the west side except for the in-vac POP PD.

The REFL AIR path is aligned. We didn't align the POP/ALS path because we didn't have green light or bright POP beam at the moment. As for the in-vac REFL detector path we placed only M2. We will install the rest of them on the east side tomorrow.

 

Below are notes for some particular sections of the west side :

Beam Diverter 1 :

We had to rotate the beam diverter #1 (BVD1) by 180 deg. The beam diverter has a couple of small PEEK materials on the mirror holder and they were initially on the side where the REFL beam hits. So we wanted to avoid this. Since there is no PEEK materials on the other side of the holder we simply rotated the whole structure by 180 deg. Of course we also flipped the mirror itself such that its high reflection surface remains facing to the REFL beam. Note that the rotation of the actual BDV1 is now different from that in the layout drawing (LIGO-D1000313-v10) because of this modification.

REFL path :

Looking at M7, which we had installed before the HIFO started, we noticed that M7 was not at the place that the diagram showed (LIGO-D1000313-v10). It was too far from the west by 2" or so. But I remembered that the position of this mirror was adjusted to catch the REFL beam at its center. So we used this mirror as a reference to recover the good alignment of the IMs and PRM. After Paul untripped IM1-4, enabled the master switch of IM1-4 and set the alignment of PRM back to that in April, we got a decent alignment without a fine tuning.Checking the REFL beam on ISCT1 we confirmed the good alignment as the beam hit the REFL shutter trigger PD.

 We also checked the beam position on the view port on the HAM1/2 septum. It was well-centered. So regarding the REFL beam as a good reference we installed the relevant optics without touching the REFL beam pointing. So for the reason M7, M1, HW1 and M14 are off from the layout (LIGO-D1000313-v10) by about 2 inches or less toward the east. Finally M7 was repositioned because we added two beam splitters which can change the beam trace by non-negligible amount. Currently the REFL beam hits the center of the top periscope mirror on ISCT1. The beam is off somewhat on the bottom periscope mirror because we touched M7 but this is not a big deal because we can steer the top mirror.

 

M14 (a.k.a. pick off for high power beam dump):

M14, which had been a 50 % BS dedicated for HIFO (see LIGO-D1201390-v2), was replaced by a 90% S-pol BS (LIGO-E040512-B4 and also mentioned in Keita's alog #7844). The removed 50% BS is currently ln the clean booth nearby HAM1 in a bag labeled as "M14".

plots of dust counts

Attached are plots of dust counts requested from 4 PM September 23 to 4 PM September 24.

plots of dust counts

Attached are plots of dust counts requested from 4 PM September 22 to 4 PM September 23.

HAM1 feedthroughs

(Alexa, Daniel)

We checked the vacuum feedthrough flanges on HAM 1 and noticed that none of the double 5-way coax flanges were installed. The missing positions are D1-3, D4-2, D5-2, D6-2 and D6-3 (see D1002872). We are also missing a double D-sub feedthrough flange on position D1-3. With some help we were able to locate the missing flanges and they are awaiting installation.

We noticed that purge air port is located on D5-3 rather than D4-3 as the drawing would indicate. The easiest way to accommodate this difference is to simply route the TT signals through D4-3. It is already equipped with a double D-sub feedthrough flange.

We were able to find some of the in-air cables. The beam diverter cables were routed to the wrong side of the chamber. They were too short to reach the designated flange, so we had to reroute them. We are missing the cables for the LSC PD DC signals and still have to install the coax cables. We have cables for the picomotors, but will do a test first.

There is no SUS satellite amp in the ISC-R4 rack. All units are at LLO and are being shipped.