(Jax, Volker, Sheila, Chris)

After reconnecting the PSL periscope PZT, we have recovered the IMC alignment.

The initial coarse alignment was done by opening the top of the PSL shutter box, so that a beam reflected off the input viewport could be compared to Volker's reference marks on the PSL enclosure wall.  We actually had to do this step twice.  The first time, after we started working with the piezo, we found out that its X and Y axes were almost 45 degrees away from horizontal and vertical.  So Volker went into the PSL and rotated the piezo/mirror assembly in its mount.  We also took the opportunity to relieve some PZT bias onto the mount.

Then the IMC was realigned and locked.  We used both some PZT bias and some movement of the MC mirrors to accomplish this.  So the input pointing is not identical to what we had before connecting the PZT.  We plan to review the input pointing later on, but for now we are ready to continue with setting up the WFS.

After Chris, Jax and Volker worked on PZT, we moved to WFS.

The first trouble we noticed was the issue with MC1 and MC3 model mentioned in the earlier alog.

The second trouble was that we didn't get any sensible signal from segment 2 of WFSB.

It turned out that the RF cable for that segment on ISCT2L was broken at the connector on the WFS head. The metal sleeve thing was loose and would rattle when touched, and it was really easy to gently pull the cable out of the connector jacket.

We left the broken cable on the table and put a temporary cable in, and the segment started behaving. After this, we set the demod phase of WFSA and WFSB correctly by wiggling MC3 PIT.

HAMs 1-6 and BSCs 1-3 are now all in bleed mode. The reservoir level dropped when the pressure went up and tripped the level switch. I lowered the level switch some to accomodate. The pressure was able to easily reach 80 psi with all the bypasses switched to operation. All the pressure gauges look good as well. Tuesday will show how much air we caught.

It seemed as if the MC1 and MC3 suspension are receiving constants from LSC and ASCIMC, i.e. L=1, P=3 and Y=5, no matter what we did for IMC WFS (first screenshot).

Eventually we found that the model is old and corresponding inter-computer communication parts were just padded with 1, 3 and 5 in the model (second screenshot).

Without updating the model WFS wouldn't work.

Jeff Kissel is being contacted.

The gradual increase leading up to the most recent "bump" was the result of manually changing the HV of IP2 from 7000V (the nominal voltage for this pressure) to 5000V (not optimal).  The remaining perturbations are the reaction to us opening/closing pump isolation valves etc...  

It looks like I'll have time to do some leak hunting on this volume next week.  Also, I assume that we will be mounting Rai's "hydrocarbon" RGA to this volume soon.

   08:42 Thomas V. working on Opt Lever around PR3/HAM3
   08:50 Overhead Door on site to work on LVEA receiving roll-up door
   09:00 Arnaud running transfer functions on ETMY
   09:02 Michael R. and Pablo working in the H2-PSL enclosure
   09:18 LVEA transition to laser hazard
   11:10 LVEA transition to laser safe
   11:55 Temperature alarm in LVEA; Ski ordered repair part and will install it on Tuesday 
  
   

The pre-aligned H1 Xarm Pcal periscope structure was wrapped (thank you JoeD), transported from the H2 Laser Area Enclosure to the Large Item Access Area, crated, and transported by Apollo to the Xarm receiving area.

On Tuesday, we plan to uncrate it, move it into the VEA, and install it in the A7 adapter.

The cabling and fiber converters were installed and verified to work today so we can get views of the Trans and Refl beams on the IO table.
The switch has been set to so these signals on the from CRT monitors and two of the LCD monitors by the operator station.

Terminated the input to the AA chassis on the first 3 channels all associated with the Tilt meters.  This is to facilitate some noise measurements by Keith Riles.  The Tilt meters were unplugged so no data will be lost.

I left the ALS pll running overnight and this morning, using a 20 hour strip tool with a 1 second sample time it looks like the loop dropped lock 3 times, once for less than a second so that the autolocker did not respond, and the other two times the auotlocker had it relocked with the full gain after 62 seconds and 33 seconds.  Most of the time not in the locked at full gain is spent ramping the gain up from the acquire gain to the locked gain, we could speed up the ramp if this is too slow.  

It was locked according to the locked bit 99.97% of the time, and locked in the full gain state 99.86% of the time.  

I set the limits fairly loosly, to try to make sure the locking conditions were met overnight, and there were no times when the locking conditions were not met. 

I also recorded the fiber launch power, fiber trans, and fiber transmitted power in the right polarization overnight.  There was about a 30% drift in the amount of power in the right polarization overnight, most of the drift does not seem to be due to a shift in polarization but in the transmission of the fiber itself.  A plot of the values I monitored overnight is attached, each one of these is normalized to its mean so that we can compare the trends.  

The gnuplot package has been added to the Ubuntu 12.04 workstations in the control room.  It is also available on Ubuntu 10.04 and 11.04 workstations.

h1fw0 goes into period of instability, restarted every two hours or so. We are investigating the problem. Provided h1fw1 continues to be stable, no data is lost.

Attached are plots of dust counts requested from 5 PM May 22 to 5 PM May 23.

The ezcademod program has been replaced with a new copy to temporarily fix a problem that prevented it from reading a complete channel list.  

Starting another set of M0/R0 TFs on ETMx, this time with the new M0F1 OSEM and with damped TFs as well.

(Sheila, Chris)

Recently the input alignment to the IMC was disturbed slightly by a test of the PZT on the PSL periscope.  After the test, the PZT was returned to its original state (unplugged), but it did not come back exactly to its original position.  This misalignment was interfering with our efforts to lock and align the mode cleaner, so Sheila consulted with Rick and Michael, and we got permission to enter the PSL enclosure and reconnect the PZT.

We did exactly that, and then went to IOT2L to search for the MC reflected beam.  However, the beam seems to be missing the table altogether, so we were not able to recover the alignment as easily as we hoped.  We gave up for tonight, left the PZT plugged in and closed the PSL shutter.  Tomorrow we'll have to start by recovering the alignment coarsely (e.g. by using a viewport reflected spot as a reference).

ETMY R0 damped transfer functions will be running for 4 hours starting at midnight.

Betsy reported that the ITMx ETMx assembly team in the staging building were near the point of needing the X1 quad test stand but that it had lost its settings, so I took a look. It turned out that there was no safe.snap file in /opt/rtcds/tst/x1/target/x1susquad/x1susquadepics/burt , so I created a symlink to /opt/rtcds/userapps/trunk/sus/x1/burtfiles/x1susquad_safe.snap which existed from 11/18/11. It also turned out that /opt/rtcds/tst/x1/userapps/release/cds/x1/medm/X1SITEMAP.adl , was pointing to .../userapps/release/sus/common/medm/quad/SUS_CUST_QUAD_OVERVIEW.adl , which was way too new, so I redirected it to .../userapps/release/sus/x1/medm/quad/SUS_CUST_QUAD_OVERVIEW.adl/SUS_CUST_QUAD_OVERVIEW.adl . The preferred commands for getting the sitemap are now sitemap1 for the quad (login as controls) and sitemap2 for the triple (login as controls3).