I've finished terminating and testing the Cat6A runs at EX and EY for the cameras and the field rack. The vacuum rack side of the runs is also terminated, but I am waiting for the appropriate shielded/grounded patch panel to finalize what's installed. In the meantime, exercise some caution around these cables if working in the vacuum rack.
IMC was bypassed.
Right now the IMC is aligned and is flashing with a wrong polarization, and the rerouted MC_REFL beam is on top of the MC transmission but with different polarization. MC transmission is all rejected by Faraday, and only a part of rerouted MC_REFL beam comes out of Faraday, but that beam is strong enough we can see the IM4 transmission all the way down to the ISS diode array.
Details to follow, but anyway conclusion is that HAM2 is ready for ISS diode array work.
JimW GregG Hugh
All the Actuators are reconnected. All the IPSs are ~zero'd. The loop targets have been reset to the ~zero position and the lvl1 isolation loop has been closed.
Based on the dial indicators, we should still be very close or even closer to alignment objective--waiting on safe conditions for Jason to confirm. We (SEI) need to shoot the level of the Optical Table but again, based on DIs, I think we are fine. A slight tweak with the DSCW springs is still doable.
I haven't retailored the loops but the L4Cs on the HEPI and the IPS themselves shows a noisier state when the position loops are closed. We may neeed to remeasure the plant TFs. I just did a dof by dof look and it looks like the Y is the main problem.
I've started a Linearity Test on opsws3--Please let it go.
New Targets for position are -1200 1700 1000 -400 -400 300 -300 -200 for X Y Z RX RY RZ HP VP
Arnaud, Rolf, Jim, Dave
At 15:10PDT we ran a 1Hz Sine excitation of ETMY to test the HWWD. Prior to the test we reduced the trip level on the HWWD to its minimum value of 60mV. Arnaud brought the excitation amplitude up slowly until the PD error condition was triggered on the HWWD. At that point the RMS read back from the HWWD was about 600 counts (on a PEM ADC channel with the 10xgain AA) and the SWWD was recording about 88mV. Arnaud was happy leaving the ETMY in this state for several minutes, so we let the HWWD run through its two 2 minute count downs. All worked correctly.
The next test is to excite ETMY using the ISI system on BSC10.
Today, Travis, Robert and I installed the temp dams in the tub sections between BSC3 and 2 and between BSC1 and 2. This will provide laser safety for IAS at the X-spool while there is laser work taking place in HAM2/3.
similarly as for TMSx few weeks ago, some of SRM and SR3 osem signals were suspiciously noisy (have been for few days), and were showing ~1700Hz oscillations. As Richard suspected, power recycling the AA chassis of those osems fixed the pb. attached is a spectra of one of the osem for SR3 and SRM before (blue/red) and after (brown/green) rebooting the chassis.
Morning's Activities (covering Justin's Morning 8:30am - 12:45pm)
Today's Maintenance Day, but some CDS maintenance work will be postponed to Thurs due to NSF Meeting.
The ISIs ODC bits were reporting ST1/ST2 isolation to be off for ETMX/ETMY whereas the isolation was on. This was due to the "Correct Gain" setting to be wrong for all DOFs in the ISO filter bank. They were corrected for ETMy and ETMx. At the same time ETMX and ETMY suspensions M0 and R0 ODC damp state were also updated.
A safe.snap should be done on ETMx/ETMy ISI/SUS before next model restart.
sus/isi snap files were saved and commited under the svn.
model restarts logged for Mon 23/Jun/2014
2014_06_23 11:15 h1susetmy
2014_06_23 11:16 h1susetmy
2014_06_23 12:11 h1susetmy
2014_06_23 12:30 h1susetmy
2014_06_23 12:58 h1susetmy
2014_06_23 13:12 h1susetmy
2014_06_23 13:16 h1susetmy
2014_06_23 15:05 h1sustmsy
2014_06_23 15:11 h1broadcast0
2014_06_23 15:11 h1dc0
2014_06_23 15:11 h1fw0
2014_06_23 15:11 h1fw1
2014_06_23 15:11 h1nds0
2014_06_23 15:11 h1nds1
no unexpected restarts. HWWD work at ETMY followed by supporting DAQ restart.
model restarts logged for Fri 20/Jun/2014
2014_06_20 13:18 h1broadcast0
2014_06_20 13:18 h1dc0
2014_06_20 13:18 h1fw0
2014_06_20 13:18 h1fw1
2014_06_20 13:18 h1nds0
2014_06_20 13:18 h1nds1
Saturday and Sunday, no restarts reported. No unexpected restarts.
Nowhere near bypassing yet.
PSL power was set to 200mW, and the polarization was set to low finess.
Position of the PSL beam reflected off of the HAM1 PSL input viewport was marked on the wall of the PSL enclosure. It was off by about 2mm to the right. The beam motion is smaller than previous vent.
Good MC mirror biases were put back.
MC didn't flash though there were already multiple bounces.
Installed irises for MC1, MC2 and MC3. There are dog clamps on the ISI as a part of permanent installation that are meant to work as stops for the base of these irises. We just picked the irises with right height, pressed them against the fixed dogs, and fixed them down using temporary dogs.
On MC2 the beam is somewhat too high and maybe about 3 or 4mm to the east. We will fix this by touching PSL.
Om MC3, it seems like the iris position is wrong for whatever reason. Maybe this is intentional, but as is, the iris should move about half inches to the west. In the attached picture, MC3 and the baffle are positioned correctly, but the iris has a big offset from the center line of the baffle. See also T1300327-V2, Figure 1.
I'd like to move the MC3 iris to where it's supposed to be and realign MC tomorrow. I will not proceed without IO's consent.
Found that MC2 intermediate mass EQ stops are VERY close (gap much smaller than 1mm, some gaps are paper thin).
Why? Is it OK to back them off a bit?
Sloppy lock just for the Septum pull. That is, not at alignment at the moment. As soon as Septum work is done we'll unlock again.
Made the moves per IAS/Jason, reattaching Actuators now using DIs for position monitoring. The two West side Verticals are complete; will continue Tuesday.
JimW GregG Hugh
Day Shift Summary LVEA Laser Safe 09:00 Gerardo & Joe – Inspect viewports at HAM2 and HAM3 09:00 Hugh – Disconnect BSC3 HEPI 09:20 Mike L – SURF tour through LVEA 09:30 Jason – Alignment work at ITMX 09:35 Jeff – Adding dust monitors at HAM2 and HAM3 09:45 Apollo & Jeff – Removing doors on HAM2 and HAM3 13:10 Hugh – Working on ITMX move 13:15 Jeff – Remove witness optics & 4” wafer from HAM2 13:45 Calum & Kate - Remove witness optic and 4" wafre from HAM3 13:52 KingSoft on site working on RO filter 15:00 Travis – General SUS cleanup in the LVEA 15:05 Dave – Reboot SUS-TMSY for hardware watch dogs 15:00 Dave – Restart the DAC
Installed new dust monitors in HAM2 and HAM3. Removed the dust monitor from the HAM assembly/staging cleanroom between HAM4 and HAM5. The dust monitor in HAM6 is showing battery/power problems. Filiberto found no problems with the power supply circuit. I am going to put this monitor on a local power supply to see if the problem is in the batteries.
PSL and IMC alignment:
At first we couldn't use PZT mirror on the PSL periscope for YAW at all. It turns out that the cables were disconnected and then a wrong cable was connected a few weeks ago. The correct cable was connected back and it was fine.
We followed Cheryl's instruction to install IMC irises to the correct location (see attached for MC1, MC2 and MC3).
Used PZT mirror to direct the beam to the center of MC2 iris, and MC1 iris was fine without doing anything.
Tweaked MC2 to bring the beam to the center of MC3 iris, and IMC started flashing immediately with occational 00 mode without touching MC1.
There was no point spending too much time on tweaking the alignment as this is in-air, so we tweaked only MC3 and stopped when the flashing became mainly of 00, 01 and 02 mode (in YAW).
The flashing light was going into Faraday, and all light was immediately rejected by Faraday (because we were injecting a wrong polarization).
Bypassing IMC:
We installed two temporary mirrors (dirty mounts wiped as good as can be done, iLIGO H2 POP periscope optics, on top of class A base plates) in the MC_REFL path, and directed that beam to MC3 such that the direct reflection off of the MC3 becomes colinear with the flashing. This is Chris-Rodica method in T1300327.
IM1, 2, 3 and 4 were all damped and the offset values were put back.
One person looks at the beams right after MC3, and the other person looks at the beams in front of IM2, and we iterated until we weren't sure if we were making things any better.
Both the MC transmission and rerouted MC REFL went into the Faraday input aperture, only the latter came out (because of the crappy polarization of the latter due to geometric rotation, which works for us in this case).
At this point, we were already able to see the IM4 transmission. Compared with the mark on the wall that Sheila made back in May, YAW was almost good, PIT was not. A small YAW adjustment was made using IM3.
Then we went back to IM1 to center on IM2 (did nothing because it was good), IM2 to center on Faraday output baffle (only adjusted PIT, YAW looked a bit off but OK), then IM to bring the IM4 transmission on the wall back to where it used to be, and after that the beam looked quite well centered on IM4.
We damped PRM, put back the old offset and the IFO REFL beam was on the REFL beam baffle. Since this depends on IM4 angle and PRM angle and since it's a big job to check the angle of IM4, we decided that at this point it was good enough to confirm that the REFL beam clears the REFL baffle hole cleanly with a minor PRM tweaking.
IM4 transmission was going to IM4 trans QPD, however the signal was so small that all we could do is to confirm that the SUM changed when we blocked the beam.
Then we confirmed that the IM4 transmission goes to the pico mirror for the ISS array, reflected and goes to the ISS array.
We need to check the PSL beam mark on the wall, because when the mark was made yesterday by Sheila and Volker, the PZT was not working for YAW.