Hugh - Working on external cabling at HAM5 and possibly HAM6 Dave - Working on the TCSX table and prepping for ring heater test Richard - Working on end stations ESD Kyle - Moving RGA cart to BSC7 area Lisa & Sheila - Setting fiducials at HAM2
no restarts reported.
David / Greg / Thomas TCSX: - QPDs tested and appear to be working correctly. Need to locate different translation stage to calibrate. - laser will be running overnight. (TCSY laser, power supplies and chiller are all OFF). - FLIR camera mount drawing added to DCC ( https://dcc.ligo.org/LIGO-D1400168 ) HWS End-X: - mounts and optics have been staged Corner HWS clamping plate: modifications to be made by Apollo Polarisers: - guys at Caltech looking at a way to bond these so that nylon screw not required to secure to the mount.
The idea is to wrap up commissioning by Saturday night. The ring heater stress test can proceed on Sunday. The vent can start Monday.
I asked EE to make/fix the whitening cables and/or install temporary new cables that are shorter than nominal, whichever is quicker. The shorter ones are to be replaced in the future.
Two cables were fixed, and the two new short ones were put in place. After this, I still saw that one of the two fixed cables (H1:ISC-Y-65, this is the first cable for WFSB) still had a short circuit for one pin. Since they didn't have enough short new ones, and since the broken bit was only for one of the whitening stages which I can leave off, I decided to keep the defective cable for now and live with it.
I also asked them to swap both of the whitening chassis, as the whitening gain was all over the place even though the BIO readback looked good, which didn't make sense, and we were getting suspicious about the whitening. The new ones were put in place.
I measured the dark noise, and both of WFSs had some problem.
For WFSA, one of the 8 channels (WFSA-Q4) would suddenly rail when the whitening gain is 24dB or larger. Up to 21dB it looks completely normal, DC output increases as I increase the gain, but when the gain reaches 24dB it suddenly jumps from a few hundred counts to 32k. Disconnected the analog, repeated it, the same result. Swapped the BIO cable, the same result. Since this seemed like a problem of the whitening chassis itself, I put one of the old whitening chassis (S1101600, which is one of the two units pulled out this morning) back and it behaved good. The problematic one is S1101636.
For WFSB, one of the channels (WFSB-I2) had much larger low frequency noise (f<1Hz) than everything else. You can kind of see that in the plot I posted yesterday, but today the noise looked larger. Disconnecting the demod didn't do anything as far as the low frequency noise is concerned, disconnecting the analog out DB9 on the whitening chassis didn't do anything, but when I went to the remote rack I immediately noiticed that the DB9 cable connector on the AA chassis was loose. I disconnected it and the noise was gone. I reseated everything, and things look good.
To summarize,
doors being craned for HAM5 and rigged such that closing the gate valve is not required 08:40 Kyle to start pump for RGA on BSC8 (WP 4647) 08:46 Aaron and Filiberto to end Y to fix short in WFS cables 08:47 Jeff B. to HAM5 to take PET swipe 09:07 Hugh to HAM5 to move equipment out of the way for door installation 09:08 Arnaud to HAM5 to take hammer measurements 09:22 Richard to end Y to drop components off for Aaron and Filiberto 09:30 Travis to LVEA test stand area to retrieve documents 10:05 Praxair driver approximately 15 minutes away 10:31 Luis Z. to end Y to install grounding wrist strap connectors on the electronics racks 10:50 Jeff B. and Andres done at HAM5 11:27 Corey to LVEA to put away equipment 12:13 Praxair truck leaving 13:11 Jodi, Travis and Betsy to the LVEA west bay 13:22 Kingsoft water to take water samples 13:27 Hugh to LVEA test stand to work on sub-assemblies for 3rd IFO ISIs 15:21 Keita to end Y to work on WFS 15:48 The septum has been installed between HAM5 and HAM6. The doors are tacked on HAM5. Sheila is transitioning the LVEA to laser hazard.
The doors are tacked on (4 bolts ea.) at ham 5. The septum is installed between ham 5 & 6 and bolts torqued.
Dan H. completed setting up of the HAM6 QPD sled yesterday. With he & Keita both happy with the Dan's mode matching measurements, the Sled wrapped up and bagged. Before doing this, positions of optics were measured (with a ruler +/- 1mm). Here are distances measured:
Photos of the HAM6 QPD Sled are located here.
The WFS Sled, QPD Sled, Fast Shutter Beam Dump, and a bag of hardware/dog clamps are all in totes in the Optics Lab and ready to be payloaded on HAM6 (most likely early next week?).
NOTE: Still missing the Fast Shutter! Still being designed/manufactured??
A document describing the mode-matching procedure is in the DCC: T1400370.
From a trend of the wind speed it appears to have gone invalid around 4:45 PM yesterday. A log of the error messages on the IOC is attached. I restarted the IOC and set the alarm limits on the wind speed.
SLED work held off doors to be installed on HAM5 after confirmation from SEI septum to be installed between HAM5 and HAM6 HEPI is locked Thomas V. installing software for HWS camera Richard fixing cables for WFS at end Y Peter NOT working in H2 PSL enclosure, waiting on missing screws Field trip expected in control room around 11:00
model restarts logged for Wed 28/May/2014
2014_05_28 08:19 h1pemmx
2014_05_28 23:53 h1nds1
pemmx was not actually restarted, I was testing the reporting system. h1nds1 is a mysterious restart.
Sheila, Lisa Since we had lost good alignment references, and the sub-optimal IR alignment was what limited the build up in the last full lock attempts , we decided to invest sometime working on the initial alignment procedure. As already known, achieving a good alignment for both IR and green is easy for the X arm, but kind of tricky for the Y arm. So, after Sheila aligned both green and IR to the X arm, we decided to commission the IR lock to the Y arm (feeding back the REFL IR signal to the MC length) with the idea that this step will become part of a future automatic alignment procedure to ensure the IR is well aligned to Y. As observed for the X arm, because of the 27 Hz and 41 Hz MC2 resonances , achieving a stable IR lock feeding back to the MC is indeed painful. We eventually succeeded by re-designing the loop so that we could keep the 41 Hz notch in the MC path always on. Phase and gain margins are not great, but this worked well enough that we could keep the cavity stably locked while optimizing BS, ITMY and ETMY so as to reach maximum build-up for IR (1 in LSC-TRY). At that point we used TMSY and the green QPDs offsets to recover some green build up, and we could relock the cavity on green; with both cavities locked at the same time we could find a way to keep maximum build-up for IR, and achieve 0.7 for green. Not fantastic, but probably not too bad; Keita's green WFSs will hopefully make the green alignment better. Happy with the IR in the arms we went back to PRMI. The PRM alignment was totally off (about 15 urad both PIT and YAW); Sheila patiently brought it back, and we could relock the PRMI stably on 1f sidebands. We leave the IFO with the green arms locked for Keita tomorrow.
Lisa, Sheila
we used Refl 9 to lock the PSL directly to the Yarm this afternoon. We rougly followed the procedure in alog 9644.
We disengaged the notch for the MC2 roll mode (ISCINF FM6), but leave FM7 on to help avoid ringing up the vertical mode at 41 Hz.
We used Refl A 9 I, with the first two whitening filters on and a whilething gain of 27 dB. This gives us a gain of roughly 1 Hz/ count.
We send Refl9 I to the Y arm filter bank. We copied the filters that were used in alog 9644, but added an additional boost with a zero at 3 Hz . The boosts and the feedback are triggered on TRY. (FM3 nd 4 are engaged, FM1 and 2 are triggered.) We are curently using a gain of 0.15.
First, yesterday we had a WFS interface cable that would short circuit -100V bias to the ground. A new cable was put in (or maybe the old one was fixed), and today I restarted WFSY-ing.
I immediately noticed that WFS whitening binary IO readback doesn't agree with the output I intended to send, for all four BIO cables.
Upon looking at the whitening chassis, I've noticed that +15V power indicator LED was really dim for WFSA whitening (first picture), but when I removed the second BIO cable from the WFSA whitening chassis the LED got bright again (second picture). But that didn't solve the readback problem for that specific cable.
I and Daniel started disconnecting cables from the binary IO output chassis, and immediately the readback got sane again, and we confirmed that BIO chassis is working fine by connecting a BIO tester. As soon as we connected the cables (that connect the BIO chassis to the field rack whitening interfaces) back to the BIO chassis (the othe end of the cable is still disconnected) the readback got mad again, and the madness is somehow dependent on how we strained and wiggled the cables.
We opened the shell of the cables, and were disappointed to find that it seemed to be really easy for the exposed conductor of the flat cable to be pressed against the shell to cause short circuit (third picture).
By removing all 8 shells (four cables both ends), and then connecting the cable back to the BIO output chassis and the whitening chassis, we were able to eliminate the readback problems for most (but not all) of the requested states. This means that most of the short circuits were gone but there are still some that is not related to the short circuiting to the shell.
And the +15V LED of WFSA whitening isn't dim any more.
Anyway, for the moment, short-circuiting between high and low is a problem but not for high-high and low-low, so we decided to find a seemingly good state where the readback don't complain. For both of the WFSs, this is +33dB whitening gain, first two filters on, third filter off.
And then I connected H1:LSC-Y_EXTRA_AO_1_EXC output to the B input of the PDH CM board, locked Y arm on green, injected a sine wave to the CM board and started measuring the demod phase of WFSs. And I noticed that there are huge differences in signal levels for quadrants, and for some quadrants I couldn't make a decent job of minimizing the injected signal in one demod quadrature.
I got suspicious about whitening and measured the dark noise coming into the ADC (4th attachment, bottom), and sure enough, whitening gains seem to be all over the place, and it seems like two channels for WFSB have only one stage of whitening filter engaged. I then found that the readback wouldn't complain at 45dB too, so I repeated the same thing with 45dB whitening gain (top), and it got better for WFSA but not for WFSB. Maybe there's still some cable-related problem though I don't know how, or maybe this is the whitening chassis problem.
The next step would be to go to the floor and look at the whitening chassis. It would also make sense to see if the whitening gain for X arm is OK.
We need some quality control for these home-made cables. End of the flat cable should be cut flush to the connector, we need some insulation between the shell and the conductors, and most importantly, the cable should be tested before installation. Not just continuity test between the pins that are supposed to be connected together, we need to check the short circuiting.
The cables are tested for shorts and continuity. They should be trimmed better.
Reading before turning it off, 1.75X10-05 torr. CC remained on the entire day.
It is off now.
Took a PET swipe of HAM6 today. This is after the alignment and balance of the suspensions in HAM4 and HAM5 and before the final installation and alignment work in HAM6.
Examined the ISI and the OMC under flashlight array for particles. There were no visible concentrations of contaminates on the horizontal or vertical surfaces. I wiped down the top of the ISI and the OMC.
Took several particle counts while working in and around the chamber.
Highest particle count in cleanroom before cover off: 16 0.3µm, 0 0.5µm, and 0 1.0µm
Highest particle count in chamber before cover off: 0 for all sizes
Highest particle count in chamber just after cover off: 203 0.3µm all other counts in the mid teens
Highest particle counts in chamber just after wipe down with cover on: 790 0.3µm, 420 0.5µm, 200 1.0µm
Highest particle counts in chamber after 5 minutes with cover on: 80 0.3µm, 30 0.5µm, 20 1.0µm
After some response from the the Cogs, I finalized the balance, cleaned up some of the SRS cables and other spode. The covers are on and pulled away from the ISI. HEPI remains locked. Purge is turned way down. TFs are underway.
Asbuilt redline added to D1001139-v2 reflecting the change of added balance Mass.
From the logged in controls account on opsws8, because I haven't been able to figure out how to get everything working nicely on my own ops account. No touching, as usual.
