Before starting work just after lunch yesterday, the particle counts were 0 in both HAM 2 and 3!
model restarts logged for Wed 16/Jul/2014
2014_07_16 10:54 h1susetmy
2014_07_16 11:17 h1broadcast0
2014_07_16 11:17 h1dc0
2014_07_16 11:17 h1fw0
2014_07_16 11:17 h1fw1
2014_07_16 11:17 h1nds0
2014_07_16 11:17 h1nds1
2014_07_16 11:20 h1fw0
2014_07_16 11:20 h1fw1
2014_07_16 11:27 h1iopsusey
2014_07_16 11:28 h1iopsusey
2014_07_16 11:30 h1iopsusey
2014_07_16 11:30 h1susetmy
2014_07_16 11:40 h1sustmsy
2014_07_16 11:43 h1broadcast0
2014_07_16 11:43 h1dc0
2014_07_16 11:43 h1fw0
2014_07_16 11:43 h1fw1
2014_07_16 11:43 h1nds0
2014_07_16 11:43 h1nds1
no unexpected restarts. DAQ restarts to support rcg2.9 upgrades at EY.
Two things that were important:
We still need to fix the ground loop problem of TMSX BOSEM, and we still need to look at the IR beam position on the viewport path, but we're basically done with the alignment.
M. Heintze, K. Izumi, T. Sadecki, J. Kissel After a harrowing few days playing the alignment game, we've accomplished Michelson fringing with the ITM alignments, as measured by a centered beam through the SRM -- and moved the OFI into position such that this fringing is seen through the OFI. The only remaining IFO alignment task is to flash the DRMI with the IMC bypass, and alleviate IM4 bias which is now closer to saturation. Today was a good day. Blow-by-blow below. Picking up where we left off at lunch (see LHO aLOG 12779), we - Restored BS alignment to pre-vent value because it's the only optic whose alignment has been preserved from HIFO-XY. (P = +180, Y = -266) - Re-checked PR3 and PR2 centering, and saw it mis-centered on PR2 (not because anything changed, just we didn't get it perfect before lunch) - Walked IM2 & IM3 to bring input beam UP in pitch on PR2 - Tweaked IM4 in Yaw -- which is now *very close* to saturation, or will be after pump-down (LL = -93630 [ct] (71% range), UR = +95966 (73% range)) - Once we hit the center of PR2, we needed no further tweaks to PR2 or PR3 or BS -- the beam was centered on ITMX and ITMY and both X-ARM and Y-ARM paths hit SR3 and SR2. - Blocked ITMY beam, centered X-ARM beam on SR2 and SRM (only small moves needed for SR3 and SR2) - Unblocked ITMY, steered ITMY a little to get Michelson fringing at and behind SRM. GOOD! - Saw beam missing OFI by ~300 [urad] of Yaw at SR2 - While gathering OFI pusher materials, tried to get flashing of SRC with SRM alignment; got close but we were ready to move before we saw flashing. During this exploration, we increased the damping gains on SR3 and SRM to try and reduce motion. They remain high, but no need to keep them that way permanently. - Moved OFI using pushers -- Front (closest to SRM) ~3/4 [in] (~20 [mm]) in +X, back ~ 3 [mm] in +X (so a slight translation in +X and a twist in -yaw) - Moved SRM AR Baffle ~1 [in] (~25 [mm]) in +X direction to center beam through aperture - Reinstalled SR3 AR Baffle, setting dog-clamps to locations as defined by D1201315. - As we left the chamber, beam is centered on SRM, at the input to OFI, and into HAM6 septum hole, with fringing visible all the way into HAM6. WIN.
And just to show that sometimes 1 computer is never enough when doing alignment work
Fantastic!
I restarted the DAQ to clear the 0x2000 status of h1susetmy due to INI file change (2.9 upgrade). This was not a clean DAQ restart. About 50% of the FE models went into a 0xbad DAQ status, which was cleared by restarting the mx streamers. This was complicated by an incorrect start_streamers.sh being in controls search path. The incorrect one is configured for LLO.
A second problem was that both framewriters restarted themselves 5 minutes into the new run, a problem which was not repeated.
The third problem is that h1susetmy had constant CRC errors from h1dc0.
Thinking that perhaps a mismatch of 2.8.4 and 2.9 models at EY was a possible cause of the CRC problem, I recompiled h1iopsusey and h1sustmsy against 2.9. Now both ETMY and TMSY had CRC errors.
The problem was tracked to the ODC channel in the SUS models using the new UINT32 data type. Until we get permission to upgrade the DAQ tp 2.9 we hand edited H1SUSETMY.ini and H1SUSTMSY.ini and changed the one instance of "datatype=7" to "datatype=2". Both models and DAQ were restarted and all are now happy campers.
HAM5 Closeout reading Particle Size Count [um] [ct] 0.3 320 0.5 120 0.7 60 1.0 60 2.0 40 5.0 10 HAM4 Closeout reading Particle Size Count [um] [ct] 0.3 50 0.5 40 0.7 30 1.0 20 2.0 20 5.0 0
And counts inside HAM5 just before starting the afternoon work yesterday:
0.3um 210
0.5um 140
1.0um 100
9:00 MattH, JeffK, Kiwamu to LVEA to work on alignments. Out at 12:00, up to PR3 9:15 Nathan to Optics lab 9:15 Betsy to BSC1/LVEA 11:00 JeffB to LVEA 13:30 MattH, JeffK, Betsy, Travis to lvea to work on alignments 14:00 RickS to H2 PSL looking for targets 14:30 Gerardo to LVEA for viewport survey, out at 15:30 16:00 RickS, MikeV, and students heading to EX
The x1work workstation underwent a package upgrade to allow compiling code with the same packages as the LHO build machine. This should allow better testing of control room tools on the test stand. Formerly, the tools would need to be compiled on the LHO build machine and copied to the test stand, now tools should be able to be built directly on the test stand.
You may need to edit your known_hosts file on the login machine to log in to x1work. The line number to delete will be given in the message if you can't log in. Sorry about that.
Particle Size Count [um] [ct] 0.3 260 0.5 110 0.7 90 1.0 40 2.0 30 5.0 10 Pretty Dirty.
Betsy took a picture of the particle counts for HAM5 entering. They were of similar order to those seeing in HAM4 from memory
Particle counts after B&K yesterday at ~6pm : in HAM5 : 0 in HAM4 : 10 < 0.3um
The Hanford summary pages (which archive useful trends for most subsystems, some GW search results, and growing) are now linked on the Advanced LIGO Hanford Observatory CDS website: https://lhocds.ligo-wa.caltech.edu/
These will serve to replace the old S6 automated FOMs.
Suggestions, questions, and feedback welcome! Please send to Duncan Macleod (duncan.macleod@ligo.org) and CC detchar (detchar@ligo.org).
J. Kissel, K. Izumi, M. Heinzte
Half-way progress report. In summary, after ditching the Jun 26th wall-spot as a reference, we've re-aligned the bypass beam to a slightly modified IMC alignment. We now see beams on the ISS QPD array, as well as the IM4 TRANS QPD, with good SUM values. We've moved the over all beam UP going into the PRC, as expected was needed (though still for an unknown reason). With this alignment, we have a beam centered on PR2 and PR3. We now move on to check the centering on the ITMs, and continue to output arm for OFI alignment check.
Blow-by-blow of this morning's activity:
- Set up temporary IMC TRANS camera, found IMC flashes weren't awesome
- Tweaked MC3 pitch/yaw to get good flashing (P = from -550 to -700 [urad], Y = from -2557 to -2550 [urad])
- Re-aligned bypass beam to IMC trans flashing
- Beam looks good on 2014-06-26 wall spot, but
- too low on IM4 TRANS QPD,
- doesn't show up on ISS array
- still too low on PR2 with IM4 P alignment close to its limit
similar to where things were left yesterday.
- Decided to give up on 2014-06-26 wall spot since its the only figure of merit "correct,"
- Also guess that its not MC3 that's causing bad flashing, but MC1
- Added copy of LP filter from IM4 TRANS QPD SUM to ISS QPD SUM filter bank to better track amount of light on ISS QPD
- Restored MC3 alignment
- Tweaked MC1 alignment to get good flashing on temp. (P = from 1254 to 1100 ; Y = from -2366 to -2400)
- Re-aligned bypass path to IMC TRANS path, found beams on both arriving IM4 TRANS QPD and ISS QPD. Spot now high ~7 [mm] from 2014-06-26 wall spot.
- Walked beam up between IM2 and IM3 (subtracting pitch in IM2, adding pitch to IM3), beam still looks OK going through the IFI
(New alignments IM2 and IM3 P = +18000 and +18000; Y = 5154.7 and -2500)
- Now beam is centered on IM4 TRANS QPD and ISS QPD, and shows ~ 30 [ct] and ~ -370 [ct] on their sums, respectively.
- Wall spot is now ~7 [mm] high, but beam is centered on PR2.
- Block MC1 and MC3 with metal shields to prevent IMC flashing
- Increase laser power to 1 [w], sum on IM4 TRANS QPD and ISS QPD is 100 [ct] and -2000 [ct].
- Draw new spot on wall, marked ast 2014/Jul/16, 7 [mm] above previous spot.
- Checked centering on PR3, looks OK. Break for lunch.
Given that with wall-spot is the only figure of merit out, we deem this new alignment of the mode cleaner and subsequent. Good!
Particle counts for in the chamber for HAM2 and HAM3 were 0's for the morning "start" work.
Didnt take them (sorry) for the closeout at the end of the morning session
ISS was unable to relock by itself this morning. So I changed the offset from -1.91 to -1.82 V. This fixed the issue. The diffraction now stays at 9% and auto-locker works fine.
"Fixing" the crappy cable.
Though we were able to see our IR beam on both of the QPDs, at first I was never able to center QPDB while QPDA was fine. After much trial and error, we used a flash light on QPDB and found out that the output from segment 4 was at least 100 times bigger than the other segments.
We swapped the in-air IR QPD cable with the green QPD cable, and suddenly things look more reasonable.
I looked at the whitening chassis of the IR QPDB, and the DB25 cable for BIO looked crooked on the front panel. I seated it properly, but the two screws that attach the connector to the chassis (let's call these the connector screws) were loose, it was sort of difficult to tighten both at the same time. The connector screws themselves looked crooked relative to the connector shell.
Then I disconnected it again, had a look, and found that the shell was half broken (attached, this is as discovered, but after disconeccting from the chassis).
Two halves of the connector shell are put together by two screws that go into tapped holes inside the shell (let's call these the shell screws), but the thread of one of the tapped holes is stripped off. The other hole was fine, but the screw was loose, therefore the connector shell was open on one side, making the connector and the connector screws misaligned with each other.
Anyway, crooked connector meant that only the whitening gain of segment 4 was controlled by the Beckhoff binary IO module while other segments were fixed to some low gain (probably zero dB). We needed to use the highest whitening gain during the HIFO test as well as today, so there should have been a huge gain imbalance there. This is likely the reason why people couldn't "center" the IR beam on the QPD sled.
My dirty "fix" was to simply tighten the working shell connector until everything is held together, and then connect the thing back to the chassis. With nothing crooked, the connector screws went in without much fuss.
But this is not really a fix, I think the shell should be replaced.
I don't remember seeing a huge imbalance on QPDB segments when we initially checked out the electronics for HIFO-X. Maybe the connector was seated properly but the connector screws were not fully screwed in because it was difficult, and later the strain on the cable eventually made the connector crooked.
We checked particle counts in the middle of the work, we had
90 0. 3 micron.
30 0.5 micron