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Reports until 15:41, Tuesday 09 August 2011
H2 INS
michael.rodruck@LIGO.ORG - posted 15:41, Tuesday 09 August 2011 (1180)
H2 PSL installation

More finishing work today on the chiller and diode rooms, and will continue on tomorrow. Thursday and Friday should be painting.

Images attached to this report
H2 General
jeffrey.kissel@LIGO.ORG - posted 13:07, Tuesday 09 August 2011 (1179)
H2SUSITMY -- Reaction Chain Better, but Still not Good
J. Kissel, P. Fritschel

After the assembly team discovered a poorly clamped blade spring tip, I've run and processed another suite of TOP to TOP measurements. Attached are the results. I notice the following:
- The frequency of the second Pitch Mode (see page 5 of "allquads") has been successfully moved up, to be near where the rest of the known QUADs resonances are. GREEN FLAG.
- The Longitudinal, Transverse, and Yaw degrees of freedom appear free and clear, very similar to the rest of the QUADs (see pages 1 2 and 6 of "allquads"). GREEN FLAG.
- The DC magnitude of the Vertical, Roll, and Pitch transfer functions is about a factor of two to low compare with the other measurements, calibrated in a consistent manner (see pages 3 4 and 5 of "allquads"). YELLOW FLAG
- Where the vertical transfer function should only show three resonances at (0.55, 2.2, and 3.5 Hz), there's a whopping 4th one at high frequency at a cross-coupled roll frequency (5 Hz) (see pages 3 of "allquads", in addition to pg 4 of "h2susitmy"). RED FLAG
- In the Roll Drive to LF and RT response transfer function (see pg 15 of "h2susitmy"), RT is about a factor of lower in DC magnitude, and the shape of the response is completely different from LF, where they should be measuring the same thing. RED FLAG

Since Betsy and Jeff's work was on the RT blade spring tip clamp, I conclude there's still something screwy going on there. Given that the pitch frequency has moved up, something must have been corrected. However, I conclude there are two possibilities: mechanical and electrical, and likely *not* a rubbing problem. Here are our ideas:
 - the dynamics of the suspension are effected by the blade tip being strangely clamped (either not totally fixed, or fixed to some bad state)
 - the differential roll that's present at the top stage is causing the RT OSEM coil to drive dissimilarly hard (most probably less hard) as LF, causing a "vertical" drive to induce roll
 - the RT coil driver electronics have been messed up in the reassembly process

I'll have the assembly team go in for the final, final-final, final, final; just before final, final investigation and change before the finally cabling up the reaction chain.
Non-image files attached to this report
H2 General
keita.kawabe@LIGO.ORG - posted 10:51, Tuesday 09 August 2011 - last comment - 11:31, Friday 12 August 2011(1178)
aLIGO VCO test in H1 MC: It's OK
This is a follow-up entry of this one in ilog. The only difference is I'm injecting 20W instead of 2W into MC.

While students were adjusting squeezing table, I quickly swapped the VCO of H1 from the old one to the aLIGO test unit and measured the MC feed back signal going to the VCO.

New VCO has a smaller range, and I needed to increase VCO gain by 8dB.

Green and blue traces in the attached are the VCO feedback signal (H1:IOO-MC_F) with the old VCO from two different lock stretches, and the red is the same thing with the new VCO but scaled down by -8dB. With this setting, OLG of the MC servo with new VCO was only about 0.4dB smaller than the old one.

The new VCO is not doing any harm. In kHz range it is clearly better than the old one.

Considering the fact that the previous test with 2W into MC showed a smaller improvement, it's also clear that the measurement is limited by the sensing noise of MC.

For a better test you need to wait for the full H1 IFO to come back, but this is already good enough in that nothing seems to be wrong.
Images attached to this report
Comments related to this report
keita.kawabe@LIGO.ORG - 11:31, Friday 12 August 2011 (1202)
Relevant links were missing from the original entry:

2011 Jul 25 ilog  (after aLIGO VCO was fixed, lower power).
Last summer ilog (before the fix, sad excess noise).
H2 INS
hugh.radkins@LIGO.ORG - posted 10:03, Tuesday 09 August 2011 (1176)
Pressure Test of LVEA HEPI Plumbing--Mezzinine to BSC8
Attached is the Apollo Pressure Test Certification.  It's all set!
Non-image files attached to this report
X1 SUS
betsy.weaver@LIGO.ORG - posted 17:55, Monday 08 August 2011 (1175)
ITMy work
Bland, Bartlett

In our continued hunt to find a rubbing source on the reaction chain (R0) of the ITMy QUAD, we discovered that the right Top Mass Blade clamp was not fully seated on the blade tip.  It's funny how this sort of thing can stare us right in the face, and yet we all miss it with the numerous sets of eyes on it!  This explains why the misplaced pitch frequency was not improved when we adjusted the blade tip heights last week - we correctly set the blade tip height, but the wire break-off point was completely in the wrong place due to the mis-seating.  

We fussed it back into place, which corrected for some of the strange roll we observed late last week.  Yet another round of OSEM alignment (undoing the table cloth adjustment I had to make last week) followed by diagonalizations of both R0 and M0 which looked much cleaner this time.  It had a thorough pass for touching EQ stops, and a careful shrouding.  We're go for TFs, ...again.

One outstanding strange thing I found today (amongst the aforementioned!): the M0 F2 OSEM seemed to need it's offset disabled in order to track appropriately on the speed dials.  SO, it seems we have not reset all of our values/buttons correctly from last weeks power outage.  I did not investigate further beyond switching the offset so I could continue with my OSEM alignment.  Can someone (ehem, Kissel) please check medm, please?

Note, Robert S. was contemplating making some mag measurements tonight, so check for damping enabled, etc.
H2 General
jonathan.berliner@LIGO.ORG - posted 16:43, Monday 08 August 2011 (1174)
Monday Ops Log
- DougC and JasonO taking shots in LVEA...done by ~1425
- ICC staging at BSC8, Kyle cranes pump cart over YBM and plans on commencing pump down soon
- Welcome MichaelS from ANU
- Reibold finishes dry wall by H2 PSL Diode Room, finishing touches remain
- Pipe welding at EX
- Alignment of BSC5 continues at EX
- RichardM investigates H2 overhead camera's signal which is flickering terribly on all displays.  Problem seems to be upstream from MSR
- BetsyB, JeffB, AndresR, EricA working in West Bay test-stand area
0918 - Hanford Fire Department arrives to check outbuildings
1300 - Diamond Freight arriving for pick-up
1400 - MikeL visits outbuildings
1440 - Laser Hazard in LVEA
1600 - DanM running cable from Computer Users' Room (LDAS tape library) to MSR under raised floor in Control Room
X1 SEI
corey.gray@LIGO.ORG - posted 16:26, Monday 08 August 2011 (1173)
BSC ISI Assembly Status

(Corey, Eric, Jeff, Jim, Vincent)

Assy#3

Continued with helicoiling the (bottom-facing) Optics Table---and made quite a bit of progress. 

Received (5) GS13's from LLO.

Assy#2

Had class-B allen wrenches to secure clean in-vac cables to mock feedthru and to the sensors.

H2 INS
michael.rodruck@LIGO.ORG - posted 16:17, Monday 08 August 2011 (1172)
H2 PSL installation

Drywall work was finished up today, and the finishing work was started. Joints are being taped and drywall is being mudded.

Images attached to this report
H2 SUS
jeffrey.kissel@LIGO.ORG - posted 14:30, Monday 08 August 2011 (1171)
H2SUSITMY Progress
B. Bland, R. Lane, J. Kissel, (B. Shapiro)

The chronology up to today (starting last Monday, 8/1) is:
2011-08-01 Rob measures R0 transfer functions which indicate second pitch mode is low, pointing toward blade spring tip heights being off from nominal

2011-08-02 Blade spring tips are adjusted, which require removal of entire top table cloth on BOTH M0 and R0 Chains

2011-08-03 Blade tips are adjusred, OSEMs are re-installed, and re-diagonalized

2011-08-04 
    - Rob re-measures R0 transfer functions, and finds pitch dynamics have not changed much, and now transverse transfer function looks like garbage.
    - LHO Sitewide Power Outage

2011-08-05 
    - Betsy plays with suspension, looks at range of motion, locking M0 and R0 penultimate stage
    - QUAD computer is brought back up, but epics values not restored

2011-08-08 
    - Jeff and Brett suggest that, since TOP to TOP diagonal transfer functions are so clean (other than transverse), perhaps SD OSEM is busted, or watchdog tripped during measurement, etc. etc.
    - Jeff restores epics values using
     /ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ITMY/Common/MatlabTools/Prepare_ITMY_20110729.m
     This script did not include the test enable binary I/O switches, which prevent drive signals from exiting the coil driver chassis. These were restored with the following:
caput H2:SUS-ITMY_TEST_BOUT_0_L32A 0xaaaa
caput H2:SUS-ITMY_TEST_BOUT_0_L32A 0xaa
     - Jeff attempts to reproduce Rob's Transverse TOP to TOP diagonal TF on R0, gets no coherence, as with Robs measurement on 2011-08-04.
     - Betsy discovers she's left the PUM stages earthquake stops slightly engaged, and removes them
     - Quick measurement of Transverse reveals medium success
     - We're reminded that the R0 chain has differential roll between TOP and UIM stage, which necessitates lowering/rotating the SD OSEM to a "clocked" position, but because of the OSEM mounting plate's motion is restricted by a pin, (see pictures attached)
     - Betsy also discovers inter-chain PUM earthquake stops have been rubbing, removes the interference BUT now notices a total pitch in the main chain. This is supported by excessively large signals signals on F1 F2 and F3 OSEMs
     - With fine pitch adjusters out of range (of course), the decision is made to correct the overall pitch in the Main chain using the coarse adjusters, regain the range of the fine adjusters, re-diagonalize OSEMs, and measure all in the morning.

Images attached to this report
H2 SEI
vincent.lhuillier@LIGO.ORG - posted 17:06, Saturday 06 August 2011 (1170)
Isolation loops - ISI - BSC8 - LVEA

This week, isolation loops have been closed on the ISI – BSC8 in the LVEA. The 12 isolation filters have been designed using one set of measurements (ISI undamped) and respecting the following criteria (Phase margin>45deg – Gain margin>20dB - Blend frequency (.75Hz) - UUG:15Hz). Blend filters used for this test are really basic (low order). Some work is ongoing on these filters.

 I have attached some powerspectra (Stage 2 GS13 in the Cartesian basis) with and without control.

Images attached to this report
LHO FMCS
kyle.ryan@LIGO.ORG - posted 18:14, Friday 05 August 2011 (1169)
Vacuum system recovery following morning power outage
Restarted Vertex MTP and resumed pumping of Vertex.  Restarted YBM MTP (not valved-in).  X-mid volume buttoned-up now (spools replaced BSC) -> left purge air running but closed purge valve at VE manifold. 

Site bake ovens not impacted-outage not long enough 
H2 INS
michael.rodruck@LIGO.ORG - posted 16:45, Friday 05 August 2011 (1168)
H2 PSL installation

Interior drywall was finished today, except for the floating layer in the chiller room. The chimney also has its drywall on. FYI, the chiller room is the one with the chimney on it, directly next to the egress door. The diode room is bigger and is next to the chiller room.

Images attached to this report
X1 SUS
betsy.weaver@LIGO.ORG - posted 15:02, Friday 05 August 2011 (1167)
ITMy (Q2) lower OSEM alignment
While I forgot to look closer for mechanical grounding higher up the chain (will do Monday morning), today I checked the range of the AOSEMs on the PenRe and the BOSEMs on the UIM.  After some rearranging of the AOSEM mounts for ease of adjustment, I was able to line up all 4 AOSEMs by eye seemingly well.  No electronics are hooked up, so I cannot tell better than by eye for now.  I also centered up 2 of the 4 UIM BOSEMs (which were a bear, but do-able).  Being that I can install and roughly align these OSEM stages, the differential roll between the Top Mass and UIM does not appear to be doing major harm further down the chain.

(It's hard to see the magnet centering from the attached pix, but you can see where the CAMs are sitting in the AOSEM adjustment plates for range.)

...to be continued.
Images attached to this report
H2 DAQ
david.barker@LIGO.ORG - posted 11:59, Friday 05 August 2011 (1166)
Site Power Outage

The Site had a power outage at 07:50 this morning. We have recovered the H2 system and the H1 system is close to being done.

H2 INS
hugh.radkins@LIGO.ORG - posted 10:34, Friday 05 August 2011 (1165)
Stage0 and Optical Table Level of ISI#1 on LVEA MTS
On July 26 Corey and I shot Optical levels of the ISI on MTS2 in the LVEA.

Attached is my logbook page.

Bottom line, the top of the Stage0, at the Alignment/Assembly Posts is level <.2mrad and,

the Optical Table is level to 1/8mrad as well. The level requirement given to me by IAS (Doug & Jason) is 0.4mrad so we are comfortably under that. So no fussing with the MTS with the ISI on top.

Additionally, with this info we can report the relative height of the Optical Table wrt the top of Stage0, basically giving us an idea of manufacturing/assembly variations from nominal:

Sam Barnum give me a 2.913" between the bottom of the down facing Optical Table and the up facing surface in the bottom of the pocket where the alignment/tooling posts position the Optical Table to Stage0.  Our optical survey distance is 2.924 putting us within .011" of nominal design.  I think all concerned would be happy with this small difference from nominal.
Non-image files attached to this report
X1 SEI
corey.gray@LIGO.ORG - posted 08:49, Friday 05 August 2011 (1150)
BSCISI#2 Status

(this is for work on Wed)

[Corey, Fabrice, Jim]

CPS Sensors hooked up

We don't have triax connectors for our mock feed-thru, so we are using Class-A-ed flange feedthrus (ones which will actually be installed on BSC chambers).  We wired the in-vacuum, cables from Sensor to Feedthru  --->  and dirty/in-air cable from Feedthru to CPS Mini Racks on floor.  The mini-racks were then cabled together via 9-pin cables.

Bad Anti-Alias Box

While making initial checks for signals, noticed non-zero values for Corner1 Sensors.  This was traced to the Corner1 Anti-Alias Box (D1002693 s/ns1102693); toggled power, and switched its power supply cable and exhibited same issue.  It was removed, and Richard's crew found that we had a fried power regulator.  This was repaired and re-installed on the rack....BUT.... Richard mentioned that these anti-alias boxes were of a Rev where there could be heating issues.  To prevent overheating, electronics boxes were re-arranged in the rack to give the Anti-Alias boxes more space/air between them to prevent overheating.

Checked Signals For Sensors

After the Anti-Alias box was repaired, confirmed that all the Trilliums, GS13s, L4Cs, and CPSs are wired up correctly (this was confirmed by watching signals on an medm window).

Images attached to this report
H2 INS
lisa.barsotti@LIGO.ORG - posted 18:45, Thursday 04 August 2011 (1164)
More TRANSMON optics cleaning
 PRIMARY mirror 

After taking with the vendor, Ken suggested to using swabs and alcohol on the big spots that we could see on the surface. I did that, and I was quite successful, except in one case, in which I only managed to spread the spot (see first picture). I tried hard to remove it, but no way, I only make it bigger (second picture). I stopped when I saw a black point appearing in the middle, as I was damaging the coating.  It is not a big deal, I think, because the "big spot" is on the edge of the surface. The rest of the surface looks better than before.


 Big folding mirror 

This one had a sticker on the barrel of the optic (see third picture). I scrub with liquinox + water forever, to try to remove the glue. Results in the forth picture. This might need another FTIR. As far as the surface is concerned, I had pretty much the same issues as for the primary mirror: some of the spots can be removed, some just spread and they damage the coating once you try hard to remove them. Again, I did that on the edge, it should be ok. 

 Secondary mirror 

The 5th picture shows the mirror before I started cleaning. It has a damage on the edge, and you can see the usual spots, but overall it seems better than the others. I scrub with liquinox on the barrel, and wipe down with methanol the surface. I didn't try to remove the spots.

 Small folding mirror 

Picture 6 shows the other folding mirror as it was before cleaning. As for the secondary, I didn't try to improve the surface.


 Conclusions  

With a couple of additional FTIR we should establish if these mirrors can go in vacuum. I don't think it is worth to try to improve the surfaces more, it is very easy to damage the coating. 
Images attached to this report
LHO FMCS
jodi.fauver@LIGO.ORG - posted 18:26, Thursday 04 August 2011 (1163)
FMP
Bubba and I spent some time down at Y-end with Fabrice looking at the cramped conditions in the VEA with the BSC ISI in mind. Fabrice is drafting a brief report to post to the DCC regarding our observations. The gist of the report: space is very tight and detailed communication/coordination will be required for install to go relatively smoothly.
LHO FMCS
jodi.fauver@LIGO.ORG - posted 18:08, Thursday 04 August 2011 (1162)
ICC
Cleanroom removed from BSC-7 to clear sight-lines for IAS survey work. Staging around BSC-8 continued. 
H2 General
jonathan.berliner@LIGO.ORG - posted 16:25, Thursday 04 August 2011 (1161)
Thursday Ops Log
- Spool installed at MX
- Clean room removed from BSC7
- Welding at EY
- DougC and JasonO surveying in the LVEA, out by 1600
0900 - Oracle arrives for GregM and DanM to install new tape library
0930 - Locksmith arrives for Ski
1400 - Gil Hibbs arrives to inspect roofs of buildings with RichardM
1625 - LVEA in Laser Hazard
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