Dave, Jim, Stefan

Stefan restarted the h1odcmaster model which has been running since Friday evening and it did two things: locked up the h1oaf0 machine and caused DAQ errors on both end station front end computers, plus LSC, ASC and SUSAUXB123. Running start-streamers on the affected front-ends did not fix the problem. We took h1oaf0 out of the dolphin fabric, its console was locked up so we power cycled the CPU. All the models started OK and the MX stream error resolved itself. A few minutes later the IOP IRIGB drifted upwards to 66 and then back down to 15.

I stopped the h1oafmaster model and then started it again. Once again it froze up the CPU but this time no MXSTREAM errors on other front ends.

We took h1oaf0 out of the fabric and power cycled, once again h1odcmaster started (with 0x2000 DAQ error due to INI file mismatch). 

We are now testing on the DTS.

The login machine has been updated today, including an updated authentication module.  This work required a reboot of the system.

The first power amplifier after the IFR function generator was saturation at an input of +13dBm.

- I reduced IFR from +13dBm to +10dBm to avoid saturation.
- I backed out all 3dB attenuators in the various feed lines.
- I added a 3-way power combiner in the the 9MHz line to the EOM.

This increased the drive to the 9MHz EOM by 10*log10(3)=4.77dB (compared to the original setting), or 1.77dB compared to yesterday's setting.

We now should have a 9MHz modulation index Gamma of about 0.17.

A new version of gds tools has been installed for the DAQ test stand computers running Ubuntu 12.04 or Mac OS X.  This will be effective with new logins or tools started from the command line of a new terminal window.  The changes include a fix for diaggui to allow it to display reference traces with the proper x-axis values (Bugzilla 254), and a fix for foton to increase the number of significant digits used in design strings.

A new version of gds tools has been installed for the control room computers running Ubuntu 12.04 or Mac OS X.  This will be effective with new logins or tools started from the command line of a new terminal window.  The changes include a fix for diaggui to allow it to display reference traces with the proper x-axis values (Bugzilla 254), and a fix for foton to increase the number of significant digits used in design strings.

Translating TMS on test stand.

Doug or Jason watching alignment.

Gerardo, Mitchell,
Yesterday the ACB was successfully balanced. Today I will work on getting the tooling and hardware needed for install kitted up. 

Yesterday we made some measurements for the noise model (end sation PDH spectra and open loop), and ALS COMM slow path, fast path and open loop). 

Then we moved on to trying to make some noise measurements.  We tuned the demod phase of RF A 9 to put the signal in the Q phase (we don't have enough range with the phase shifter to put it in the I phase).  The demod is now on local control (remote controls not working) with al switches down except for 8, 2, 1, and 1/2 (11.5 ns delay). 

We also tried to check the IR alingment into the arm cavity by locking at the transmitted PD.  We found the 00 mode with the COMM PLL offset at 1.23, and saw up to 90 counts in transmission.  We saw a misalingment mode (between pitch and yaw) at 6.48, with 17 counts in transmission.  We strugged to improve this, mostly because the transmitted power was fluctuating so much from the frequency noise. 

We engaged the boost on the PLL readback path, (adding more DC gain to ALS CARM).  This reduced the noise significantly, although we were still moving by mre than a linewidth, so we can't really make a linear measurement when locked with ALS COMM. 

Evan, Yuta, Stefan, Kiwamu,

As a preparation of ASC for PRMI, we briefly checked the WFS RF chains and then adjusted all the demodulation phases. We didn't attempt to close an ASC loop yet.

RF signal check:

When we checked the RF output from the WFSs, surprisingly we didn't find a reasonable signal at all. It eventually turned out that the REFL was not aligned on the WFSs due to some accidental servo on RM1 and RM2. Anyway, since we were already at the floor with an network analyzer, we went through all the segment by injecting an excitation at the RF test input and measuring the RF output for a sanity check. All the segment looked good and the measurement we got was consistent with what Rich did a long time ago (see alog 8022).

Also, we did the I-Q balance adjustment on a demodulator for REFL_B_RF9 by doing the same test as we did before (see alog 9100) because we haven't adjusted it due to a electronics malfunction. The resultant phase difference is:

H1:ASC-REFL_B_RF9_SEG4_PHASE_D = 88.27

The amplitude of I and Q were differ by 1% which is noticable, but we didn't correct it because in soem future we might change the whitening gain settings which messes up the amplitude balancing.

Adjustment of demod phases:

To have a pure in-phase signal, we excited the IMC length by injecting a 500 Hz sinusoidal signal into the IMC servo board. At the beginning, we had the PRMI locked and used it as a PM-to-AM convertor. However, for some reason, the PRMI doesn't stay locked for a long time at that time. Instead we simply used unintetionally-existing RFAM reflected off of PRM without any interferometer aligned. Of course, the RFAM was off from the true in-phase. Therefore we had to add a correction offset to all the demod phase at the end by using LSC_RF9 and LSC_RF45 since we knew that they were well adjusted for a in-phase signal.

The results are:

• H1:ASC-REFL_A_RF9_SEG1_PHASE_R 101.6
• H1:ASC-REFL_A_RF9_SEG2_PHASE_R 106.1
• H1:ASC-REFL_A_RF9_SEG3_PHASE_R 99.3
• H1:ASC-REFL_A_RF9_SEG4_PHASE_R 98.5
• H1:ASC-REFL_B_RF9_SEG1_PHASE_R 89
• H1:ASC-REFL_B_RF9_SEG2_PHASE_R 90
• H1:ASC-REFL_B_RF9_SEG3_PHASE_R 94
• H1:ASC-REFL_B_RF9_SEG4_PHASE_R 94
• H1:ASC-REFL_A_RF45_SEG1_PHASE_R -75.4
• H1:ASC-REFL_A_RF45_SEG2_PHASE_R -64.9
• H1:ASC-REFL_A_RF45_SEG3_PHASE_R -65.4
• H1:ASC-REFL_A_RF45_SEG4_PHASE_R -68.9
• H1:ASC-REFL_B_RF45_SEG1_PHASE_R -138.9
• H1:ASC-REFL_B_RF45_SEG2_PHASE_R -141.9
• H1:ASC-REFL_B_RF45_SEG3_PHASE_R -140.7
• H1:ASC-REFL_B_RF45_SEG4_PHASE_R -142.2

After the adjustment, we started shaking PR2 in pitch at 95 Hz. The signals mostly showed up in the Q signals everywhere. We are not certian what this indicates at this point.

Sheila, Kiwamu, Stefan

For the green team: The green beam needs to be realigned on ISCT1 because we had to move PR3.

We noticed that the maximum green arm transmitted light had dropped significantly (from 830 cts to about 500 cts) over the past day.

Also when we locked the PRMI on sidebands, we noticed that the POP18 buildup had dropped from 24000cts tp 4000cts. Looking at the in-vac POP QPDs we found that the actual build-up didn't drop significantly. Thus we suspected clipping, and indeed the green beam was on the edge of the first iris on the table. We moved PR3 to (P:-237.328, Y:-257.276) to center the beam on the iris. Indeed, when we locked up PRMI again we were back at 24000cts.

The old slider values were (P:-240.328, Y:-252.276), so we moved 3urad in pit, and 5urad in yaw.

[Yuta, Evan]

We have implemented a servo that uses the tip-tilts RM1 and RM2 to keep the REFL beam on the in-vacuum WFS.

By driving RM1 and RM2 in pitch with a sine (20 cts amplitude, ~2 Hz frequency) and monitoring the pitch signals from REFL_A_DC and REFL_B_DC, we were able to extract the following coupling matrix which takes RM1/RM2 pitch to REFL_A_DC/REFL_B_DC pitch:

From this we computed the following normalized inverse matrix:

We entered this matrix into ASC_INMATRIX_P_FULL as taking REFL_A_DC and REFL_B_DC to DC1 and DC2. We repeated the sine wave injections and found that the responses of DC1_P and DC2_P were largely orthogonal, indicating that this matrix gives good diagonalization.

We repeated the above for the yaw signals. The measured matrix is

and from this the appropriate normalized inverse is

We again verified that this gave good orthogonalization of DC1_Y and DC2_Y.

We then used the DC centering filter banks to make a loop. We use a pure integrator, constructed from a pole-zero stage at 0 and 0.05 Hz respectively, and a pole at 0.05 Hz. For DC1_P, we use a gain of 200; for DC1_Y, we use a gain of -200; and for DC2_P and DC2_Y, we use a gain of 4000. We measured the OLTFs of these loops and found that they had a UGF of 0.4 Hz, with at least 30 degrees of phase margin.

TMS Alignment Work

Our first alignment check by Doug showed that we were low ~1cm & to the right ~1cm (when looking from the front).  Since vertical adjustment is fairly easy, we went about correcting some of this vertical by re-hanging the TMS. 

The wires coming down from the Upper Structure have three vertical position holes to connect to; they are 6mm apart from each other vertically.  When we hung the Lower Structure last week, we could not recall which set of holes we used when we were in BSC6 so we screwed our clamps into the "middle" set of holes.  So, with us being low by 1cm we needed to attach the wires to the lowest set of holes and get everything to move up 6mm.  This requires using the Genie lift to come in and take the load of the TMS Lower Structure so we can disconnect the wires & re-connect to lower holes to raise the entire assembly.  This vertical move did the trick and we were right on the scribe = VERTICAL is GOOD.

Took another look at horizontal after the vertical change and for horizontal, we need to move the entire assembly 6.5mm to the "left".  Since this is a major endeavor, we're going to tackle this tomrrow with Doug.  We'll need to get Pushers & teflon-tipped dog clamps on deck.

Mirror Mount Dump Clips Installed

After a second iteration of modifying in the machine shop, these clips were finally able to slip on to the mirror mounts (these are so much more easier to install before optics are installed!).  We now have (8) of these Dump Clips installed on mirror mounts.

BOSEMs working & TMS Damped

We were not able to look at our TMS SUS signals last week.  Turns out the cable was not connected at the sattelite box/rack.  Once we were connected, we adjusted BOSEM positions to get their outputs zeroed.  Once the BOSEMs were positioned, the TMS was also damped (but the IOP Watchdog tripped quite a bit).

TMS EY Photos

Photos of our work will be posted here.

Brett S Arnaud P

This afternoon we measured the resonnance frequencies of the ETMY in two locking configurations in order for Brett to improve the parameters of the quad model. We used PUM/UIM osem signals as well as the "temporary" optical lever to measure them. We plugged the pd electronics to the three first channels of h1pemey ADC0 in order to read the op lev signal from dtt.

For the first measurement, the top mass was locked and PUM, UIM, test mass were free. At first we didn't have a really clear signal from the PD in Pitch and Yaw, and since the PUM flags seemed to be really low and touching the osems Brett had to adjust the earthquake stops of the reaction chain in order to get the lower masses freely suspended. After the few adjustements, measurement showed all the needed frequencies in the osems as well as in the op lev.

For the second measurement, the top mass and UIM were locked. This time, the reflected beam was moving too much due to excess pitch/yaw motion, and after waiting a long time for the suspension to settle down, we changed the plan, and pointed the beam to the right edge of the test mass (bottom edge of the ear) to measure only the bounce modes. The dtt spectra of the op lev sum looked somehow funny. Fortunately the PUM osem signals were sufficient and showed all the frequencies, even the ones of the bounce modes.

Brett will post the results when they will be processed

I was on a mission of figuring out what we need to get done for running the OAF (Online Adaptive Filtering) model. I started the mission from simply copying Livingston's model. It seems that there are many things to be done mainly on some other models e.g. HEPI, ISI and PEM models.

Here are the items we have to do to get the model fully compiled:

• A model, called h1pemcs, needs to be newly created.
• h1pemex and h1pemey need to have RFM blocks to send some signals to h1oaf
• All the ISI models need to have PCIe blocks to send the GS13 signals to h1oaf
• h1hpibs needs to have a couple of PICe blocks
• We need to copy some c-coded stuff from /isc/l1/src/

HAM3-ISI tripped recently and needed to be turned back on. Commissioners noticed that the command buttons were not working anymore.

It turns out that someone ran an SVN update on the following file: /opt/rtcds/userapps/release/isi/common/scripts/HAMISItool, which was to be updated along with new models, screens and scripts, after testing at MIT. Having a model/script mismatch, the command script would be looking for inexistent channels, and fail.

I reverted HAMISItool to -r5830. This script should not be updated from the SVN again, until the latest HAM-ISI update gets propagated.

HAM3-ISI was turned back on with Isolation Lv3 and 01_28 blend filters. Target values were not changed to ensure returning to previous alignment.

Modified black glass holders worked only for some Siskiyou mounts, not all.

Some screw heads are sticking out more than the others. I could have forced it really hard and probably it would have fit, but I didn't want to risk changing the alignment. Another round of clean milling job was done, parts will go to air bake again on Monday.

TMS was balanced nicely at the level good for IAS.

We put everything except the black glass holders on the table (we put black glasses themselves directly on the table at their approximate positions).

Added two 200 grams masses to compensate for the fact that we removed Hartman reference path mirrors and mounts (480 grams together). Combined with 8 pieces of black grasses, this should be close enough.

We changed the cable bracket position to prevent cable interference.

After these, we balanced both the top mass and the table by using slide masses.

No signal from TMS BOSEMs.

BOSEM cables were connected but I don't see anything in the digital world.

Ideally, we'd like IAS to work while TMS is damped.

Jeff B. & Kate G.

A horizontal 4" witness plate (wafer) and horizontal 1" optic (S/N 1247) were placed near the center of the SEI table on Feb 5th. A vertical 1" optic (S/N 1245) was mounted on the HR side of SR2. A vertical wafer still needs to be set near SR2. 

Important notes: Witness samples were not placed immediately after the chamber was opened. Jeff did some cleaning before SR2 was installed and the wafers and optics were placed. Also, the 1" optics were removed from their PET G containers, put in PEEK holders, double bagged, and stuck in a bag with other tools before going in chamber. I didn't see obvious scratches in the First Contact, so hopefully the samples weren't damaged.