The plan of the day was to set a cleanroom over BSC2 so that we could pull the dome at that chamber and de-populate both BSC2 and BSC3, including SEI stacks prior to cleaning either chamber. Unfortunately, reality got in the way: turns out it is impossible to set two regular BSC cleanrooms side by side and have both cleanrooms center over the domes. If the short-sided BSC cleanroom was available, the plan would work but "the special" cleanroom is tied up at BSC8! In addition, there is a limited soft roof supply soooo.... We went with de-install lite: pull the beamsplitter from BSC2 and then de-install at BSC3. 

After lunch, Cheryl and I went in to document the condition of the optics and chambers. Cheryl took lots of pictures. The highlight (or low light) of the initial inspection was the elliptical baffles in BSC3 and BSC1. The side of the black glass facing away from the optic has both a very fine layer of particulate and then an overlying of larger particulate. There seem to be features associated with gloved fingertips touching the glass: it looks like the oxide from the chamber interior may be differentially attracted to these spots. (I'm sure Cheryl will attach pix when she gets a chance.) On a brighter note, the side of the glass that faces the optic looked quite clean. We found the usual metal fines, a few fibers, etc. on the suspensions. Of the three chambers, BSC2 appeared to be the dirtiest. I took a wipe sample from the chamber bottom and collected two clumps of fibrous material there. We looked at bellows convolutions: BSC1 was atrocious as it contained a couple areas that looked like chunky mucus and some small shards of what looked like black glass. We saw the usual mess at gate valves with particulate accumulated onto rollers, large particulate gathered up in all the low spots and lots of smaller particulate on all flat surfaces. There is even a very long fiber (~2 inches) down in BSC1's gate valve. (I'll try and collect it when we chamber clean there.)

Once we were finished, Michael L, Chris S, and Kiwamu went in and retrieved the OSEMS and beamsplitter from BSC2. 

[Jeff B, Deepak K, Andres R and Gerardo M2]

Thursday 19th April 2012

 - The Upper mass was weighed and additional weighs were added to match the weight of 3115g.

 - The Intermediate mass was assembled and additional weights were added to match the weight of 2983g.

 - The Lower mass was assembled and weighed to be 2891g. The weight was 12g lower than the mass from Nebula (2903g).

 - The additional mass was added to the intermediate mass bringing its total weight to 2995g (2893g + 12g).

Attached are plots of dust counts > .5 microns. I have also included a plot of H0:PEM-LAB_DST3_MODE to show when it was invalid.

The airshower has been installed and is now working properly. We can get strong airflow inside, although the seams where the top and bottom join still need to be caulked. The laser and anterooms are being finished up, groove filler is installed and the wall panel gasket will be finished tomorrow. The certification process will finish tomorrow with dust and pressure readings.

Travis and I finished pay-loading the suspensions on the BSC8 ISI table (sleeve, cross braces, vibration absorbers).  We left the QUAD hanging free, no shields in place, so be careful if you must enter the chamber.  The reaction chain cabling is half undone due to some troubleshooting needed on the L2 OSEM signals (looks like a shorted cable somewhere - ugh).  So, don't look at the reaction chain alignment.  I believe Hugh is up next for HEPI work, followed by some more IAS X,Y,Z alignment.

EricA & Hugh

First we covered the ISI and sealed it to the Walking Plates so we could swap out the Cleanroom softroof.  The ISI remains with this softcover in place.

We then worked on the installing the remaining Electrical Feedthru Protection Shrouds.  There remains two SUS FTs that are not protected but we'll complete those in the morning.  We'll continue with putting the HEPI Actuator into run mode and complete the HEPI Pier Pod wiring for the Actuators and Sensors.

Also, the Dial Indicators are in place and we are ready to suspend the lot on the HEPI Springs.

Of note, I see one of the ICS Feedthrus is installed upside down and this is an issue as the inside of the 25pin feedthru allows one to attempt to install the cable incorrectly and possibly damage the feedthru.  This feedthru should probably be pulled and rotated like all others.

This morning Kyle and I were working on reducing air flow at FAN06 by changing the variable pitch setting. While we were at lunch (~12:58 local time) the fan apparently tripped at the motor control unit - possibly on a motor temperature as we noticed the fan housing was noticeably warmer than SF05.

Patrick noticed particle counts had risen in the OSB lab and alerted us. Flow has been restored to the original state.

Additionally two return air registers in the control room have been removed in an effort to reduce noise.

The attachment shows the modifications of the ISI dynamic due to the addition of the damping components on the ISI and the QUAD. It also shows a comparison of the two ISIs used for the single arm test in their final configurations (BSC8 with ITMY&FMY; BSC6 with ETMY&TMSY).

The damping components are working fine and the two units look pretty consistent.

Measured/adjusted the pitch and yaw of the ITMy this morning:

• Pitch: 46 µrad down
• Yaw: 1.1 mrad CCW

We guesstimated the CPy pitch/yaw by roughly measuring its lateral displacement at the total station and calculating the angle.  Pitch is now roughly equal to the ITMy, but yaw is approximately 1.8 mrad CW.  This gives a differental yaw between the ITMy and CPy of 2.9 mrad CW.  For comparison, the differential yaw between the ITMy and CPy from the original alignment was 2.3 mrad CW (test stand alignment on 5 Dec 2011 was last time CPy yaw was measured).  Currently discussing path forward.

[Stuart A, Gerardo M2 and Jeff B]

After making the final cabling connections to the optical bench ('vacuum' feedthroughs) from the triple test stand to the PR3 (HLTS) suspension all BOSEM channels could be observed to be present. Two harnesses to the M1 stage are laced at present (thanks to Betsy) with the lower stage harnesses only being required once magnets and AOSEMs are installed.

Using the new triple test stand + new iMac station in the staging building and extracting data with:- 
tdsavg 10 X1:SUS-HXTS_M1_OSEMINF_T1_IN1 (etc)

BOSEMs
------
s/n 311, open-light = 19528.6 (T1 to suspect container)
s/n 073, open-light = 26501.0 (T1) C connector

s/n 017, open-light = 19340.3 (T2 to suspect container)
s/n 061, open-light = 30538.6 (T2) B connector

s/n 019, open-light = 24897.1 (T3 to suspect container)
s/n 064, open-light = 29098.6 (T3)

s/n 577, open-light = 23854.4 (LF to suspect container)
s/n 069, open-light = 26619.2 (LF)

s/n 244, open-light = 24967.5 (RT to suspect container)
s/n 063, open-light = 27050.4 (RT)

s/n 698, open-light = 18031.3 (SD to suspect container)
s/n 700, open-light = 29138.9 (SD)

Identified a routing issue with T1 harness connected to T2 and vice versa. So these were swapped around, which did not require any re-routing of the harness as there was sufficient slack. After referring to the routing doc T1100612 it would appear that the connection to T1 is correct, but the connection to T2 should be connector D. This needs to be checked out to see if its a possible mislabelling or cabling issue.  

A new suspect BOSEM glass container has been established on the BOSEM storage shelf.

Blade stops have now been released and PR3 is re-suspended. Some alignment of BOSEMs and flags is still required as the LF flag can be seen to be rubbing.

I have installed a new front end h2peml0 model onto h2tcsl0 to test the band limited RMS system. For testing purposes only the X signal is being BLRMS'ed. The new system also has the 6-part name structure as requested by Robert.

Attached are plots of dust counts > .5 microns.

[Stuart A, Jeff G, Jeff K, Joe B, Dave B, Jim B , Jeff B and many others]

It has been a busy week so far, so please excuse the tardiness of this aLOG entry! I just wished to post an overview of the current status of the LHO triple test stand:-  

- Transferred the functional LLO x2sushxts27 model, which was renamed x1sushxts27 for the LHO teststand. The cds model parameters were finally revised to dcuid = 17, host = tripleteststand). (See LHO aLOG entry 2637).

- Thanks to Joe B at LLO, for rectifying the simulink model and master model linking issues we encountered, enabling it to be successfully compiled and installed on the LHO test stand. Sanity checks were also carried out ensuring the model ADC channels were consistent with the triple test stand wiring diagrams (D1101834-v1). In the near future we shall need to also provide LHO with the latest version of the x2sushxts05 model too.

- Thanks to Jeff G at LHO, who, once the model was up and running, has been working on the medm screens. Basic functionality is there, but some further refinement and additional functionality is to be added.

- Once the medm screens were up and running foton filters were installed. Renamed versions of the LLO filters have been installed for both models (X1SUSHXTS27.txt and X1SUSHXTS05.txt).

- Set medm watchdogs accordingly (see LHO aLog entry 2576).

- Populated Sensor Alignment matrices for M2 and M3 stages.

- Configured defaults for OSEM input filters for M1, M2 and M3 (offset = -15000, gain = 1).

- Set Damping filter parameters taken from LLO PR3 measurements (see LLO aLog entry 2921).

- Generated and populated OSEM2EUL and EUL2OSEM matrices for PR3 using "make_sus_hlts_projections.m" script.

- Taken a BURT snapshot "20120418_x1sushxts27_PR3.snap" of the current functional PR3 configuration, which has been relocated to the following path:- /opt/rtcds3/tst/x1/cds_user_apps/trunk/sus/x1/burtfiles. This snapshot has also been committed to the svn as of this entry. 

The LHO triple test stand now has sufficient functionality to allow open-light measurements to be made on OSEMs and for real-time visualisation of OSEM alignment. Hence the test stand was put to first use measuring PR3 M1 stage BOSEMS (see LHO aLog entry 2639). 

Still need to configure the coil output filters, check channel list, and check for correct sensor and actuator signs, which can be carried-out now that the BOSEMs can be aligned.

Thanks for everyone's support and effort in getting this far! There is still some more work to do, but ideally we would aim to be in a position to take M1-M1 transfer functions of PR3 within 24 hrs.

[Jeff B, Deepak K, Andres R]

Monday 16th April 2012

- Started with the build of MC1

- All the parts including the blades needed were separated and the serial numbers were noted down.

- Sub assemblies(Barrel EQ Stops, Face EQ Stops , Upper Blades) were assembled.

- The frame for MC1 (S/N 505) was setup on the table.

- Some of the EQ stops sub-assemblies were assembled on to the frame.

Tuesday 17th April 2012

- The remaining of the EQ stops sub-assemblies were assembled.

- The Upper Blades(S/N 605 & 609) were assembled on to the top of the frame with their appropriate clamps (0 deg).

- The Blade guards were partially assembled allowing the blades to be in their unloaded state.

- The AOSEM alignment assemblies were done and stored separately.

Wednes2day 18th April 201

 - The Upper mass was assembled.

- The Lower Blades (S/N 607, 616, 631 & 695) were assembled to the upper mass with their appropriate clamps (0.5 deg downwards).

- The remaining parts were assembled excluding the Magnets on to the main section.

- The wires and clamps are to be assembled.

The BSC6 ISI was unlocked just before 3pm.

Over the last few days, we re-cabled and re-suspended the (now wire looped) ITMy QUAD suspension.  Travis made a first pass at adjusting out some pitch gross error.  He and Thomas then replaced the ACB into it's nominal position.  Travis removed the optic face shield and then installed the IAS corner cube onto the suspension, and Jason and Doug are working at setting up and measuring height and distance of the ITMy from the spool.  We will wait to finish installing the rest of the payload (sleeve, vibration absorbers) until IAS tells us how much adjustment we will need to make on the suspension.

Witness plates were cleaned in preparation for replacement into chamber prior to the door going back on. They are in the staging cleanroom.

Cleanrooms were re-arranged to accommodate placing the ALS table on the south side of the chamber underneath the E-module.

Dome removed from BSC3. The decision was made to move the cleanroom from HAM7-8 to BSC2.