We'll be using the BSC8 cables/controls/models to test BSFM02, so the FMy MEDM settings will be changed for this testing phase.
Mark Barton and Betsy Bland We created a directory, ^/trunk/BSFM/X1/BSFM02 , in the SUS SVN for the BSFM suspension about to be tested on the solid stack in the LVEA. Because it's Phase 1 testing, we declare it honorary X1, despite the facts that: * It was originally intended as H1:BS. * It is now slated to be repurposed as I1:BS. * It will be tested with H2:ITMy cabling and channels.
Travis, Betsy
The BS which had been built for H1 on the solid stack/test stand in the LVEA is now destined for India. (The FMy from BSC8 is due to become the new H1 BS.) Travis has resumed work on the BS in order to finish it and stow it for India, thus making space for the BSC8 rework for H1. In line with the standard way we had been naming suspensions, this BS is now being dubbed "BSFM02" as it will be built and tested only to Phase 1 prior to storage. BSFM02 has been coarsely aligned.
Attached are plots of dust counts > .5 microns approximately from 6 AM to 6 PM in particles per cubic foot.
We tuned the QPD sled Gouy telescope using the modemaster and a fiber coupled source. Basically copied LLO, however the difference in source parameter means that some of the things are different. Details about the source and the tuning parameters etc. will be detailed in T1200433, which is yet to be written.
Then we have centered the QPDs using hand held QPD LCD readout box (D1102092). QPD cables were clamped down on the sled.
(Turned out that the hand held box had a pin compatibility issue. I, Richard McCarthy and Rich Abbott talked, and Richard made a patch job so I can go on. Rich is going to modify the rest of the units at Caltech.)
We've wrapped it in a foil and put it in a big ameristat bag.
One caveat, though, is that it turned out that we don't have a suitable black glasses that fits the J-clamp for 1-inch optics (at least in the lab). Also, rectangular black glasses that are supposed to be installed just outside of the sled were too thick and didn't fit the V holders.
We will be able to install them when we go in to HAM3 for real alignment in the future, not this time.
Attached are a few photos from the build. ALL photos from work are in ResourceSpace, here.
[Stuart A, Jeff B] Following previous M1-M1 TF measurements taken for PRM (HSTS) which exhibited signs of environmental noise coupling into the Role and Pitch DOFs (see LHO aLOG entry 4232), TFs have now been re-taken during a quieter period. The first plot (2012-09-20_1215_X1SUSPRM_M1_ALL_TFs.pdf) shows a comparison between PRM and the HSTS model. The second plot (allhstss_2012-09-20_1445_All_Phase1b_HSTSs_ALL_ZOOMED_TFs.pdf) shows a comparison between PRM and every other HSTS suspension that has completed Phase 1b testing for both sites. The TFs obtained for PRM are in good agreement with the model, and fall within the scatter of modal peaks observed for other suspensions. Therefore, this should now finally complete Phase 1b testing of this suspension. All data, plots, results and scripts have been committed to the SusSVN as of this entry.
JimW GregG & Hugh & the fantastic Cleaning Crew Karen & Christina! The cleanroom was spotless and the can was polished. We pulled the lid and drove the ISI on the container base into the cleanroom. It will start getting podded tomorrow
EricA JimP Keith Filiberto & Hugh We continued emptying the last of the fluid in the lines. Eric disconnected the BSC8 chamber tubing from the 4-way valves and plugged the tubing. Then he removed the Accumulators from the Manifolds. Jim & Keith then took the tubing out from the BSC. The supply mains were then pulled east and cut to extract them from the OMC area. THere are a few hangers etc on the chamber but those will be pulled in the AM. All the cable pulling is compete, CPS racks are removed as are the Dial Indicator trees. Do we have to pull the Cable trays to put in the Walking Plates? Do we need the Walking Plates?
The old Balzers RGA mounted at YEND was powered down and valved out today to facilitate electrical work. This RGA was valved into the system ~June 8 by Kyle and I.
NOTE - this is NOT Rai's RGA - it was not disturbed.
Attached are plots of dust counts > .5 microns in particles per cubic foot.
I have uploaded a brief report on efforts to understand and diagonalize the OSEM sensor readouts on the two quadruple suspensions at LHO. The BSC8 chamber containing ITMY is now out of vacuum and so further testing on it will not be possible for the near future. The ETMY will still be under vacuum and is amenable to more testing that should help us understand how to fix the responses of the lower stages of the quad suspension OSEMs.
https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?.submit=Number&docid=t1200442&version=
EricA Hugh & Apollo JimP & Keith We throttled down the Pump Station operating press to 30psi, then move the BSC8 4-way valves to bypass isolating the Actuators at the Chamber. We then put the Pump Station System up on the Mechanical Room Mezzanine into recirculate mode. Then the 1-1/2" supply lines in the LVEA were closed. With pans and pitchers in place, we started opening up the drain and vent ports. With a little additional help from some bottled gas in the vent port we have pretty much emptied the system. All the port are closed for the night. We'll let the fluid pool overnight--there is a lot of shallow sloped tube. In the morning we'll dump the final bit that accumulates overnight and then start taking out the temporary lines.
Started assembling BSC#4's lockers today and encountered a rather annoying issue, which, I vaguely recall, we may have run into before. When inserting the Stage 1-2 locker sleeves (D1000875) into the locker housing (D1000908) I could thread the sleeve down into the housing, but couldn't get it down the last 1/4 inch. I suspect that there is some manufacturing issue with the sleeve, because I had no such difficulties with the Stage 0-1 parts, which use the same housing. The sleeve does have very tight tolerances to the housing, so a small error in concentricity would totally screw this up. There are a couple of pretty easy fixes for this (lathe the interfering part down, or electropolish a couple tenths off) but the sleeve is coated with a anti-friction treatment, which will need to be re-applied and thus slow down re-processing after the fix. I was able to find enough sleeves that happened to work (3 out of 7 tried) to keep BSC#4 moving, but this job took 3 times as long as it should have. Otherwise BSC#4 is going well, the superstructure is assembled and is now waiting to be populated with sensors, springs, lockers, etc. We are also slowly working towards getting the other staging building test stand converted so we can start on #5, whose Stage 0 plates are currently waiting on the floor for some free table space.
Wipe down started this morning.
We moved the green iLIGO cleanroom from the HAM6 Laser Bay so that we could use it on the E Module at BSC8. I also worked on the cleanroom curtains.
This morning, Bubba and I moved three optic table enclosures from the LEA to the LVEA. One went to the HAM6 Laser Bay and two will be craned over into the West Bay for dis-assembly and storage since they are destined for LIGO India. This afternoon, Bubba fired up Big Red and moved the BSC ISI from Y-mid to the LEA.
There was a transverse to yaw cross coupling noted in the TFs for H1-PRM (orange trace). To isolate the problem we moved the side BOSEM to the other side of the suspension and re-tested. With the BOSEM on the opposite side, the cross coupling disappeared (black trace). Before moving the BOSEM back to its correct side position, I found the magnet/flag base to be misaligned. This was corrected and the BOSEM was re-centered to 50% light. Subsequent testing shows the cross coupling has been removed (purple trace). H1-MC3 and H1-PR2 also show the same cross coupling. We will check the side magnet/flag base alignment on these two suspensions and re-align as necessary.
[Stuart A, Jeff K and Jeff B] Adjustment of the PRM (HSTS) side flag mounts rectified the Y to T cross coupling observed in previous measurements. But something else appears to have cropped up. The plots below (allhstss_2012-09-19_0940_All_Phase1b_PRMs_ALL_ZOOMED_TFs.pdf) show a comparison between the latest two complete data sets of un-damped M1-M1 TFs, with the most recent being the orange trace. It can be seen that these recent TFs exhibit signs off:- - Roll (slide 4) looks to show stronger vertical mode coupling at ~0.85Hz - Pitch (slide 5) looks to show stronger vertical mode coupling at ~0.85Hz Most likely, these are sensor-related cross couplings -- as in the usual imperfect subtraction of common mode signal (Vertical) in the differential signals (Roll and Pitch). But they were not so apparent in the 2012−09−06_2000 data, and we wish to be sure that they are not related to the re-alignment carried out on PRM to rectify the Y to T cross coupling. To demonstrate the significane of these Pitch and Roll cross couplings, we provide a plot showing similar couplings for ALL HSTSs from both sites (allhstss_2012-09-19_1040_All_Phase1b_HSTSs_ALL_ZOOMED_TFs.pdf). This demonstrates that compared to other HSTSs the feature in pitch (again the orange trace) is less of a concern. However, the feature in roll could be considered egregious. It should be noted that the most recent PRM TFs were taken during the middle of an active day. Therefore, the next data will be taken at a quieter time, when the common mode (Vertical) signal is reduced (or by just turning on the Vertical damping loops while taking the Pitch and Roll measurements with loops open). All plots and scripts have been committed to the sus SVN as of this entry.
Attached are the new INMON settings for BSFM02 based on the OLVs measured this morning.