HAM3 is now locked. Went smoothly, but I noticed that the soft covers on both sides are very tight, like they are undersized, and hit the corners of the ISI. I'm not sure exactly when the west door was removed in relation to MC alignment activities, so it would probably be worth if for those teams to take another look at their alignments. With the ISI unlocked, a dragging cover is more than enough to pull the ISI out of position. Covers were pulled completely clear of the ISI before locking, so it should be back to its nominal position, now.

Chamber cleanroom moved from BSC9 to BSC5 so that leak hunt at the dome could begin as soon as a soft roof is available. (Clean garb shipment due tomorrow.)Special care was taken with GV20 (hard closed) and GV19 (soft closed by Kyle).

East door removed.

X2 accumulation from Friday.

I had to go home in the afternoon, so we couldn't do any alignment work, which should be done on Monday. EY is in laser hazard.

We did check the beam diverter. (This one should be replaced anyway, but not before moving the entire EY to H1 position. https://services.ligo-wa.caltech.edu/integrationissues/show_bug.cgi?id=83)

Beam diverter is connected to F2-2C2 feedthrough on BSC6. From outside, pin1-14 is the coil, pin2-15 is one of the reed switches (SW1), and pin3-16 is the other (SW2).

When pin1 is positive and pin14 negative, the beam diverter moves from "open" position where the mirror is tipped toward EY to "closed" position where it is tipped away from EY.

However, we've found that pin1 is short-circuited to the chamber and the building ground. This means that you need a floating supply to drive it (which is not a problem for a proper driver but is a problem when you're using a power supply with one of the pins grounded). If for example the negative is grounded and if you try to "close" it by supplying positive to pin 1, all current goes to the ground via short circuit, not the coil.

Anyway, the problem is somewhere in the chamber. This should be checked when EY is moved to the H1 position, most likely an offending cable should be replaced.

One of the reed switches is still stuck, despite a previous report that it was somehow magically unstuck: https://services.ligo-wa.caltech.edu/integrationissues/show_bug.cgi?id=2

When in "open" position both of the switches are closed. When "closed" one of the switch opens.

M. Barton, D. Bridges, J. Kissel

These are the beginnings of the aLIGO Production Matlab Dynamical Model of the Output Mode Cleaner Suspension (OMCS). The last (known) attempt at this was during the Final Design Review: T080138, but the OMC breadboard suspension design has changed dramatically since (see the aWiki for details). Mark has brushed off the dust and greased the wheels of the core model components, 
${SusSVN}/sus/trunk/Common/MatlabTools/DoubleModel_Production/ssmake2MBf.m
${SusSVN}/sus/trunk/Common/MatlabTools/DoubleModel_Production/symbexport2full.m,
and Derek and I have gathered enough information from his SolidWorks Assembly (D0900295) for me to create new parameter files:
${SusSVN}/sus/trunk/Common/MatlabTools/DoubleModel_Production/omcsopt_metal.m
${SusSVN}/sus/trunk/Common/MatlabTools/DoubleModel_Production/omcsopt_glass.m

With the usual-style wrapper function,
${SusSVN}/sus/trunk/Common/MatlabTools/DoubleModel_Production/generate_Double_Model_Production.m,
I've compared all three parameter sets (where omcsopt_doublep.m is the FDR version from T080138), and attached the TOP to TOP transfer functions. Details of the differences in parameters are listed below, but the major differences are
(1) Bug fix with moments of inertia (a mix up between SolidWorks and Euler Suspension coordinate systems that's now resolved)
(2) M1 to M2 wire length is shorter by 3 [cm]
(3) The suspension break-off point (the "d2") of the breadboard increased from 3 [mm] to 40 [mm]
(4) We're now correctly accounting for the imperfect flexing of the wires (i.e. turned on the flexure correction)
With these differences, the rotational dynamics are totally different (modes frequencies are all shuffled around), but not nearly as bad as I thought it would be because of the shorter wires and larger d2 (with which I would expect *higher* mode frequencies). I'll be interested to see these parameters plugged back into the full Mathematica model to check out the mode shapes.

ANYWAYS, 
Step 2 is to get some data once we've built up one of these suckers, and compare. Then we'll do the usual compare and contrast to see if the model's in any way accurate*.
Step 3 is to develop the whole suite of software that we have for the other suspensions, i.e. transfer function comparisons, actuation range calculations, residual ground estimates, etc. 
Step 4 is to design damping loops (though not much thought is needed, just a little gain tuning on the basic loops should be fine for now).

... but at least we're done with Step 1 finally!

-----------------

* Note that there's very little difference in dynamics between the glass and metal parameter set, but I didn't know that before getting started, so I created both. Once we get a few measurements under our belt, if we see that the assembly variance outweighs the dynamical variance, we can toss one of the sets in the trash and move on.

Detailed breakdown of parameter differences:

    'Fields'     'omcsopt_doublep'    'omcsopt_metal'    'Abs. Difference'    'Rel. Difference [%]'
    'm2'        [          6.895]    [        6.971]    [          0.076]    '1.1%'               
    'I2x'       [          0.139]    [       0.0152]    [        -0.1238]    '-89.1%'             
    'I2y'       [         0.0164]    [        0.148]    [         0.1316]    '802%'               
    'I2z'       [           0.15]    [        0.136]    [         -0.014]    '-9.33%'             
    'l1'        [           0.25]    [       0.2496]    [        -0.0004]    '-0.16%'             
    'l2'        [           0.25]    [         0.22]    [          -0.03]    '-12%'               
    'r2'        [       0.000102]    [    0.0001005]    [       -1.5e-06]    '-1.47%'             
    'Y1'        [       2.12e+11]    [    2.119e+11]    [     -100000000]    '-0.0472%'           
    'Y2'        [       2.12e+11]    [    2.119e+11]    [     -100000000]    '-0.0472%'           
    'ufc1'      [           2.38]    [         2.34]    [          -0.04]    '-1.68%'             
    'stage2'    [              0]    [            1]    [              1]    'Inf%'               
    'd0'        [         0.0018]    [        0.001]    [        -0.0008]    '-44.4%'             
    'd1'        [         0.0015]    [        0.001]    [        -0.0005]    '-33.3%'             
    'd2'        [          0.003]    [       0.0402]    [         0.0372]    '1.24e+03%'   


    'Parameter'                      'omcsopt_metal'    'omcsopt_glass'    'Abs. Difference'    'Rel. Difference [%]'
    'm2'                             [        6.971]    [        6.916]    [         -0.055]    '-0.789%'            
    'I2x'                            [       0.0152]    [       0.0142]    [         -0.001]    '-6.58%'             
    'I2y'                            [        0.148]    [        0.132]    [         -0.016]    '-10.8%'             
    'I2z'                            [        0.136]    [        0.122]    [         -0.014]    '-10.3%'             
    'd2'                             [       0.0402]    [       0.0391]    [        -0.0011]    '-2.74%'             
    'flex1'                          [    0.0018715]    [    0.0018768]    [     5.3147e-06]    '0.284%'             
    'flex2'                          [   0.00099653]    [    0.0010005]    [     3.9546e-06]    '0.397%'             
    'kc2'                            [       624.29]    [       619.36]    [        -4.9255]    '-0.789%'            
    'tl2'                            [       0.2612]    [       0.2601]    [        -0.0011]    '-0.421%'            
    'l_suspoint_to_centreofoptic'    [       0.5118]    [       0.5107]    [        -0.0011]    '-0.215%'


Also scripts and functions are committed to 
${SusSVN}/sus/trunk/Common/MatlabTools/DoubleModel_Production/
as of this entry. Svn up and away!

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM March 7 to 5 PM March 8. Also attached are plots of the modes to show when they were running/acquiring data.

Data was taken from h1nds1.
13-03-08-06-01-47T0=13-03-08-01-00-00; Length=86400 (s)
1800 seconds worth of data was unavailable on this server
1439.0 minutes of trend displayed

For .3 and .5 micron plots:
1800 seconds worth of data was unavailable on this server
1439.0 minutes of trend displayed
read(); errno=9
read(); errno=9
T0=13-03-08-01-00-00; Length=86400 (s)
No data output.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM March 6 to 5 PM March 7. Also attached are plots of the modes to show when they were running/acquiring data.

Data was taken from h1nds1.
T0=13-03-07-01-00-00; Length=86400 (s)
480 seconds worth of data was unavailable on this server
1397.0 minutes of trend displayed

Some of today's activity:

• Gerardo closed GV15 at 8:45 AM and opened it at 3:30 PM.  Nothing unusual appeared on nearby gauges.
• Apollo removed the HAM 3 door this morning.  Robert inspected the chamber before yielding to IAS.
• Guido and Joe installed a PSL - HAM1 light pipe.  RIchard put a lock and tag on it.
• Richard transitioned the LVEA to laser safe at 11:15 AM.  The LVEA remains laser safe.
• Pablo stored the PCal aliagnment laser in the LVEA near the H2 PSL.
• CDS rebooted the H1 DAQ after removing the slow channels associated with an unstable PSL ENV Windows machine.
• Dust monitor 4 has displayed a "low battery" warning all day, and dust monitor 1 has displayed "calibrate failure" all day.
• Work permits signed by ops today: HAM 3 clean room cleaning (completed early this morning). 

After Jeff K created the front end model for OMC (see alog entry 5717) the blank epics values and filters have been filled in for :

-ISI sensor input filters (copied from MC1)

-Offload ouput filters (copied from MC1)

-Osem input filters (copied from MC1)

-OSEM2EUL and EUL2OSEM matrices (calculated with the newly created make_susomcs_projections.m living in /ligo/svncommon/SusSVN/sus/trunk/OMCS/Common/MatlabTools). The lever arms/distances between OSEMS to calculate the matrices have been taken from the drawings attached.

-Coil output filters (copied from MC1)

-Watchdog DC/AC/actuator Band limiters (copied from MC1)

-ISC input filters (copied from MC1)

A new safe.snap (/opt/rtcds/lho/h1/target/h1susomc/h1susomcepics/burt) has been created pointing to the saved snapshot h1susomc_safe.snap (/opt/rtcds/userapps/trunk/sus/h1/burtfiles)

The filter file, the burtsafe file, and the make_susomcsprojection script have been commited on the svn

Still to do : CART2EUL, EUL2CART matrices, and damping filters

Finally got enough fluid pumped in and enough air out of the lines to hold a steady level at the Mezzinine Reservoir.  Currently all four pumps are running in servo mode at 19psi; this drives the output to the motor at a little less than 3/4 of the max.  This has been the state for a little over an hour.  I just checked the Mezzinine and the level remains constant and a thorough check of the LVEA reveals no leaks.  The system will throttle back if a block occurs and should not see any pressure spikes; it will shut down if fluid levels drop too low.

The polarization into HAM 2 is changed inside the PSL table using an additional wave plate. 
After aligning the IMC yesterday back to flashes, today we checked the beam on the periscope mirrors in the PSL and on IMC2. It is reasonably well centered on the periscope mirrors (within 2-3mm) and as far as we can tell within 2mm centered on IMC2 in Yaw and within 1mm in Pitch. 

We removed the wave plate after the IMC from its Siskiyou mount and bolted it on the table next to the mount. This turns the polarization back to the polarization we want in the Faraday and the beam clears the Faraday w/o a problem. 

One issue: IM3 is misaligned by a lot in yaw and some on pitch, barely clearing the elliptical baffle. This is consistent with the changes we saw in OSEM readings of 18mrad in yaw and 4 mrad in pitch between December and now. It is not clear where this is coming from. 
Other mirrors on HAM2 don't show these large changes but we also had to tweak IMC1 and 3 by a few mrad to close the beam path. 
Something to keep an eye on. 

We left the polarization in this state; Chris and Rodica will continue alignment and power measurements next week in this stage.

Joe Gleason, Deepak Kumar, GM

Joe Gleason, Guido Mueller, Deepak Kumar

We've installed the ALS light pipe. Richard has installed the lock and tag #2097, key# 3123. Much like the Main beam pipe the ALS one shows a horizontal offset from the upper periscope mirror and is fully offset in the PVC pipe in order to pass through. This may require re-positioning the upper ALS periscope mirror if it is found the beam cannot pass to HAM1 safely.

I went out first thing this morning and took a few particle counts at HAM3 west door (all particle sizes read zero at both 6 ft and 1 ft from floor), near the electronics rack near HAM3 (hits above 150 on all particle sizes at both 6 ft and 1 ft from floor), and in the gap between BSC2 and HAM3 (hits above 25 at all particle sizes 6 ft and 1 ft from floor with cleaning going on at HAM3 east door). I wrapped the electronics rack/cable trays in CPStat and took additional particle counts (all particle sizes read zero at both 6 ft and 1 ft from floor). The cleaning crew was working on second cleaning while I finished up the rack. Mick and Ed closed the gap in the HAM3 cleanroom by running a sheet of CPStat underneath the beam tube. 

The anticipated order of events for the rest of the morning is as follows:
1. Remove west door from HAM3/replace with soft cover (Randy and crew)
2. Remove hard cover from HAM3/replace with soft cover (Randy and crew)
3. Remove and gently lower BSC2 curtains (Randy and crew)
4. Let dust settle (20-30 minutes)
5. Damp mop floors with special attention at HAM3 west door and at the border between cleanrooms (Karen)
6. Check particle counts (Mark L.)
7. If counts good, proceed. If not, remediate. (Randy and crew)
8. Cleanroom and contamination check and photos in HAM3 (Robert S.)
9. IAS set-up (Jason)
10.Prep for HAM3 east door removal (Randy and crew)

Dale is operator: he has this list and will serve as point of contact.

This morning I turned on the CPSes at BSC2 to see if they all survived, and it looks like one didn't make it. The horizontal St1 sensor on corner 1 is reading 32k counts, which probably means a broken in-vacuum cable. I went out to the chamber and checked all of the in air connections,  which looked good. I then swapped the horizontal and vertical cables at the box to rule out the board, but the problem followed the probe. At this point it could be the in-air cable (they rarely fail), the feed-thru (seems unlikely), the in-vacuum connection (which can't be accessed right now, there's a hard cover on the chamber) and the probe. I'll try to swap the in-air cable later today, but the rest will have to wait until we can get back into the lower part of BSC2. We can still float the ISI and HEPI, but no post-flight transfer functions until this is resolved. I am a little surprised that this particular sensor broke, because the horizontal sensors are better protected than the verticals, and this corner had a better routing scheme than the other two.

This time without any IOCs running.

• The LVEA currently sits in laser hazard
• H0:PEM-LVEA_DUST_LOC1_STATUS went into alarm overnight.  The expert screen for that monitor reads "Calibrate failure"
• A number of PSL ENV channels are white in the alarm handler
• Yellow:  H1SEIH23, H1SUSB123, H1SUSB6, H!SUSQUADTST, ITMY OSEM6

Some flashing was seen on REFL, but without the MC servo, no locking. 

The IMC alignment did not survive the recent vent, swap of dummy mass from HAM2, and installation of PRM and PR3, and bellows removal from HAM3.   Changes to the PSL have changed the input pointing into the vacuum system.  HAM3, while in theory seems to be OK, has not been fully vetted at this point, and there are some changes in the way MC2 is hanging in it's cage.

Changes to HAM2 include:
- a rotation of ISI by 19um
- an elevation change of ISI by 30um
- a shift of HEPI by 4um East (so small, likely thermal)
- an elevation change 1-4um in HEPI (miniscule)

MC1
- length -9um
- pitch +549urad
- yaw  +307urad
- MC1 also had a side OSEM flag that was touching but is centered now

MC3
- length -42um
- pitch +199rad
- yaw  +95urad


HAM3
- bellows removed.

MC2
- length -11um
- pitch +89urad
- yaw  -12urad


PSL
- beam from PMC is a bit high on it's alignment iris, and significantly better centered after the room temperature was lowered by MichaelR, and the laser is again thermally stable.

- alignment shift on my second alignment iris on the leakage beam from the bottom periscope is now attributed to a mix of changes made to the pickoff beam splitter for that iris made while I was out with the flu, and the beam shift seen coming from the PMC.

- the current beam coming from the PSL doesn't hit either set of marks we used for our previous alignments.  The PSL beams marked on the wall have two locations marked - one in-air that we used to do the original alignment of the IMC, and one under-vacuum when the IMC was locking well.  The PSL beams are now splitting those marks.


While some of these change seem small, I have concerns that a stuck or damaged sensor could be relaying false information about the state of a system.  I believe it's possible that the tilt and rotation of the HAM2 table, when combined, is having a greater effect than just looking at the one set of sensors for each degree of freedom.

[Keita and Kiwamu]

Details are coming soon.

EY stays laser hazard tonight. Alignment of the red beam path will be performed tomorrow.