We've connected all of the cables on the ITMx QUAD and all 20 OSEMs have some sort of signal coming out to medm.  Thanks Richard for some power and rack troubleshooting on QUADTST.  There is some strangeness on the medm so Arnaud is looking into what model version is loaded on the QUADTST testbed.  The main chain does not damp so we likely have crossed signals or a sign flip somewhere...?  More from him to come.

The Continued Story of CB3

On Wed, there were unresolved issues with cabling for the TMS.  The main issue was a cable bracket (CB3) which, on a drawing, is supposed to be on the east side of the table (i.e. -Y side of TMS), but having it here has limited access, and it would be even worse after we box it in when the Table/Telescope was installed.  

Now the cables (TMS OSEMs) which use CB3 eventually run to a feedthru which is quite on the other side of the TMS (i.e. the +Y side of it); on this side of the TMS there is lots of open space & getting to the feedthru is trivial.  So, after consulting with Cheryl/Mike/Calum, Jeff & I decided to move CB3 from it's "called out" location on the "edge" of the table to roughly the center of the table.  So, the "quadrapuss" OSEM cable D1000234 was run to this feedthru (and excess bundled near bracket), then D1000225 was run straight "north" on the table and out to a spot where Jim W suggested---then he'd be able to dress it on the ISI and on to the feedthru.  The beauty of this cable run is that we have elegant access to the cables & cable bracket.

This leaves us ready at the Cartridge to bring in the Table/Telescope.  

Table/Telescope Installed On Test Stand:  Promise!

Throughout the day, I also prepped the Table/Telescope for the trip form the TMS Lab to the Test Stand.  I blew off the Telescope Mirrors, installed the TMS Cover (to protect Table optics), and arranged the Genie and Table/Telescope for the move first thing tomorrow morning.

Attached are photos of how Jeff B. ran the cabling and where he positioned CB3 (the D1000225 has about 14' of cable and it is coiled on the table ready to be grabbed by SEI for final dressing to feedthru).

Attached are plots of dust counts requested from 4 PM August 28 to 4 PM August 29.

Attached are plots of dust counts requested from 4 PM August 27 to 4 PM August 28.

To tie up some loose ends, I went back to the EY drift event of 07/19/2013 00:00 UTC (elog 7146), which was triggered by turning off the clean room.

The attached plot 1 shows 20 days around the event. Marked in dark blue is the turn-off event, marked in bright clue is the turning on of the same clean room a day after. I am not sure where exactly the two temperature sensors are located, but I amsure the actual temperature jump at the BSC was bigger (From John's elog 7149 is was >2degF).

According to the OSEMS the TMSY drifted by about 5 urad in pitch and yaw (ignore sharp steps due to realignments) - I don't think that can be responsible for us falling off the photodiode. so something else must have moved.

The ETMY is even less: ~2urad in pitch and nothing significant in yaw (plot 2).

The PZT actuators (under QPD control, slaving the beam to the TMS) show some shift, but nothing that would be very unusual.

So the bottom line is: I still don't understand why we fell of the diodes on ISCTEY that day.

'

I have been trying to familiarize myself with Rai's "hydrocarbon" RGA (software and apparatus) which is mounted on the East door of HAM3 and have included some preliminary scans taken today.  These aren't intended to contribute to the eventual analysis but are interesting nonetheless.  It looks to me like the lack of distinct hydrocarbon peaks will necessitate an accumulation on the RGA's 80K "cryo finger".  We may need to compare scans with and without CP2.  

Rai has already used this same setup to quantify the hydrocarbon partial pressures at the Y-end and has commented on the expected impact on aLIGO mirrors (see T1100561, T1100642, T1200021 and T1200395). 

Note: these .pdfs contain "sticky notes" without which these scans won't have much meaning

- Apollo crew working on the floor of End-Y.
- Apollo installed HAM door in LVEA.
- Arnaud was taking TF of the BS.
- Dust monitors location updated (I guess Patrick did it).
- Richard went to mid-X to check equipment.
- Dave installed firefox on left operator's computer for camera views.
- Dave copy firefox's folder after crash (lost bookmarks) on main operator computer.
- Rick and Christina (her last day) working on PSL.

pablo

Last night, I left the two ISIs at the corner station with the aggressive feedback isolation filters and the feedfoward engaged. HEPIs are just controlled in position (100mHz UGF). Configurations were almost identical (cf item 5) on both ISI (low blend on translations and high blend on rotations to limit noise injection).

I have attached spectra of the stage 2 motion in the Y direction.
Note that:
1- ISIs didn't trip during a long stretch of time. The control is very robust (the ITMY feedback filters were even designed with the HEPI locked)
2- The stage 2 motion in the Y direction meet the requirements for both ISIs
3- The performance are similar for both ISIs
4- The feedforward control allows squashing the HEPI pier resonance on ITMY (feedforward filters clearly need to be reworked on BS)
5- ITMY performs slightly better than BS at low frequency. I noticed that the sensor correction was engaged on stage 2 in the Y direction. It might explain the difference

I have removed the lock and tag on the ALS light pipe entering HAM 1 and opened the shutter.

Ham 6 doors are on with 4 bolts each. Flange joints on hams 4,5,&6 are taped all around, started sealing vacant bolt holes on same flanges.
Relocated clean room that was over ham 4 to area in front of hi bay.
Tyler in machine shop, talked with Betsy regarding a longer tap, still working on SUS parts.
Flooring guys at end y will finish this afternoon, with the exception of approximately 14' of trim. This trim had to be oredered and is 2 weeks out. This trim is where the seams come together and does not pose any contamination isssue.

Following previous aLog (7568) on PR2 top mass transfer functions, lower masses phase 3b transfer functions have been taken and measurements data have been processed. Plots attached are showing comparison with model and other hsts measurements

(1) H1 PR2 M2 to M2 undamped TF (July 2013 in pink) against L1 PRM M2 to M2 undamped TF (July 2013 in orange) against hsts model

(2) H1 PR2 M3 to M3 undamped TF (July 2013 in pink) against L1 PRM M3 to M3 undamped TF (July 2013 in orange) against hsts model

Looking at M2-M2 TF, the two highest resonnances of pitch (3.094 Hz and 3.641Hz) are shifted down compared with the model and LLO's measurement (3.216Hz and 3.778Hz). 

Those measurements have been taken with DTT and the xml templates are located on the svn under sus/trunk/HSTS/H1/PR2/{SAGM2 or SAGM3}/Data/2013-07-15_1900_H1SUSPR2_M2_WhiteNoise_{L or P or Y}_0p01to50Hz.xml

Data, plots and scripts have been commited to the svn

The legacy web pages from iligo (e.g. blue, ilog) are down at the moment. LDAS is looking into the problem.

Jeff B moved Dust monitor 15 from HAM5/6 cleanroom to small cleanroom just north of HAM 4 where suspensions are loitering. I have changed the wiki to reflect this.

Twenty days since last fill (8/9/13)---added 375mL distilled water this morning.

Last Friday Travis and I finished hanging the metal ITMx QUAD and adjusting out coarse alignment errors.

On Monday, I disassembled the lower metal masses and dummy wire segments from the ITMx QUAD.  The RH guys attached the RH (see their alog below).

On Tuesday, Gerardo, Travis and I moved the ITMx and CP optics from the LSB bonding lab to the LVEA.  The ergo arm was transported from Ex to the LVEA and recleaned.  Using the arm, we stuffed both optics into the ITMx QUAD currently hanging from the ISI on the LVEA test stand after first peeling the CP-HR and the ITMx-AR First Contact sheets (using N2).  Note, I had to fold the FC sheet on the CP-AR in all the way around it's edge since it's diameter was too large and the ergo arm could not get good suction on it to pick it up.  The suspension also had a coarse cleaning to blow off particulate prior to installing the optics - cleaning these suspensions is very difficult however since the equipment cannot reach the trapped areas and working real estate is so limited.

Yesterday, Travis and I attached the new loop wire segments to the main and reaction chains and fully suspended them.  No gross alignment errors observed, so prism placements and loop lengths are good!  We then proceded to lace the reaction chain cables.  We need to make some height adjustments and also plumb in the 12 top BOSEMs to get damping control before we can start taking IAS measurements, but we hope that will come together today/tomorrow.

- Jeff, Corey, Andres, Cheryl

Upper Structure:
- OSEM cables dressed on the upper mass
- cables that go through the upper mass are loosely bundled and tied to the ISI
- dog clamps that were adjusted yesterday were torqued to spec.
- telescope safety support beams were attached to the upper structure cube

TO DO:
- look at CB-3 cable bracket placement in D1300007-v2.  I put in a separate alog.
- redress upper mass cables after hanging the telescope.  The upper mass is sitting high, so cables attached to it need to be adjusted after it's back in position.  I worked on the cables coming through the upper mass in an attempt to have them not touch the upper mass and not rub against each other.  Many attempts failed and Jeff's idea to tie them together is our only option for having them not touch the upper mass.


ISC Table / Telescope:
- Corey cleaned all the ISC table optics with Top Gun
- he and I looked at a couple optics early in the day, and we both saw that the large particulate does come off pretty well, and the smaller particulate doesn't really budge - a familiar scene
- threaded rods that hold the protective cover for the ISC optics are in C&B overnight - they are a good 4" longer than necessary, and the extra threaded rod gets scraped as the protective cover is installed and removed, so I asked to have the extra length removed and the parts recleaned class-B


TO DO:
- revisit the telescope optics with Top Gun to remove any particulate that might have fallen from the ISC table

In D1300007 CB-3 is placed on the -Y side of the TMSX upper structure.  Betsy had moved the bracket, but after looking at the test stand today, I asked Jeff to install it in the original location.

When I look up D1300007, Betsy has a redline drawing, and placed the bracket on the +X side of the TMS upper structure, but this is not accessible from below the upper structure once the ISC table/telescope is in place.  Betsy's redline only claimed interference with the test stand, and there is no test stand interference for CB-3's original location.  Maybe Betsy's redline drawing didn't fully explain her thinking.  I sent her a text but didn't hear back.

Late today, after installing the safety support beams on TMS, it's clear that the real issue with the original placement of CB-3 is that there is only about 6" to access the bracket  from below, and access is between the telescope safety support beams (only 18" apart) - difficult and a risk to TMS.  

If the bracket must stay on the -Y side of the upper structure, my only suggestion is that moving CB-3 toward the QUAD cable brackets might allow slightly better access.  Alternatively, maybe the +X side of the upper structure can be accessed through the structure, so would work?  Either way, an alternative placement should be considered before bringing the TMS telescope under the ISI.

Kiwamu, Stefan

We brought the IMC back to test the new FSS code. It seems to work as advertised - in Kiwamu's words: "fantastic".

First we verified that we can manually lock the FSS, and then engage the autolocker without dropping lock.

Next we verified that that if the temperature is close enough, but the FSS is not locked, the autolocker immediately tries state 2. This trick also seems to work often under normal operations.

Next we locked the MC and kicked it as hard as we could (inverting the fast gain). This triggered the FSS autolocker to drop back to state 2 (with the temperature output frozen), but it came back up to state 4 after 1 sec.
The simple IMC autolocker also seems to work reliably - 10sec after inverting the fast gain, we were back up.

For the temp loop we also verified that the integrator hold in state 2 & 3, as well as the integrator clearing in state 0 works.

I checked in all relevant files to svn - revision 5533:
/opt/rtcds/userapps/release/psl/common/medm/PSL_FSS.adl
/opt/rtcds/userapps/release/psl/common/models/pslfss.mdl
/opt/rtcds/userapps/release/psl/common/src/fss/FSS_AUTOLOCKV2.c

At 2pm we transitioned the LAE to commisioning mode again. As Rick recommended we increased the temperature inside the room to match with the temperature in science mode operation. 

We reduced the power send to the PMc to the same level available in Low-Power-Mode (14W) and adjusted the PMC, ISS and FSS loop to that power level. We have not turned the high power oscillator off, yet, to perform a set of DBB measurements tomorrow morning. 

The DBB had to be realigned because of wrong settings in the snap file which was loaded after the power outage this weekend. 

I also adjusted the half-wave plate downstream of the PMC to send 1.5W in the IO path and checked that the power in front of the lower periscope mirror was only 0.94W. 

At 5pm I switched back to science mode operation of the LAE.

Before lunch I got the sign off on the Optical Table position from IAS (Jason;) I expect you'll see an entry from him shortly.  This was preceded by an elevation survey performed by myself and GregG:

Our initial level had an 11mil runout about 4mils low per target (D1100398/E1000403).  We did a couple small large Spring adjustments and finished at <8mils runout at -220.1mm average elevation Gz (0 error from spec.)

After IAS was done, I activated the CPS, recorded locked positions and then unlocked the IAS.  I repeated the lock and unlock recording the CPS all around.  The largest change observed was <1200cts or 0.04mm, comfortably under our <1600 cts max lock/unlock change.

WHAM6 has dummy payload on viton suitable for testing and is ready for doors.

One final thing--conferring with Bubba/Apollo: I will lock the HEPI this afternoon and will not install HEPI electronics.  Will keep the Dial Indicators in place to monitor HEPI position--please respect these.