Mechanical brushing started this morning and about half of the chamber was brushed by ~10am. The remainder of the chamber was finished shortly after lunch. Hand brushing the details was about 3/4 complete by the time the crew came out early for safety meeting. The drills did not do well today: 7+ for this chamber with 3-4 DOA (meaning they would not even turn).

Attached are plots of dust counts > .5 microns.

Uninstalled the transport safety restraint and installed the in-chamber restraint. 

TMS is now connected to the West wall of the chamber by the restraint bar. You can still go in and out of the chamber from the West door, but you need to duck.

We didn't care to balance things as the ISI is probably not level. Especially, the upper mass is still locked (but the telescope is not).

The new BSC-ISI model (isi2stagemaster.mdl) includes a DAQKill part. This part is used when one of the following condition is met:
- Rogue excitation (Voltage on the coil drivers readbacks when the masterswicth is turned off or the ISI watchdogs are tripped)
- Excessive motion on stage 1 CPS
- ISI ST1 watchdog tripped (If SUS watchdogs trip, ISI watchdogs trip too)

More details of the changes.

In the ISI models, there are 2 channels that cannot be turned off by the ISI watchdogs.

For the test I drove offsets on:
- HEPI outputs (valve drivers turned off)
- ISI outputs channels (cables unpplugged)
- The test channels of the ISI (not connected)

I tripped the stage 1 watchdog:
- The test channels of the ISI went to zero (DAQ_KILL part)
- The output of the ISI went to zero (Watchdogs + DAQKILL)
- The HEPI channels kept driving

The DAQKILL is working fine in the BSC-ISI model.

Removed existing viewports and replaced with blank flanges with the exception of (1) each 10" to 2.75" zero-length reducer which was needed to re-mount the gauge pair that was left over from the BSC6 removal.  I am pumping the Y-mid overnight and will leak test the new flange joints tomorrow.  

Expect pressures to rise in both the Y1 and Y2 beam-tube modules as neither have a means to pump hydrogen while in the current VE configuration

Got the Bench Mark Elevations from Scott(Apollo) and we can now put the numbers on the actual elevation.

Based on the end station zero datum being the middle of the B-nozzles on the BSC6 chamber, just as we've done in the LVEA (BSC2), the Optical Table is intended to be located at 1661.7mm (E1101071).  Our survey yesterday has the average elevation at 1661.8mm.  The reference bench marks we used were place at the end station last July when we rebuilt the External SEI, set the support tubes and installed the HEPI.

Very nice work Scott, Ed, Randy (Apollo); and GregG

Modified master file for daqd to include X1EDCU_ISIHAMX.ini and X1EDCU_IOPSEIBSC6.ini, restarted daqd process.

For some reason not known, the IOP process on the SEI test stand was taking too much CPU time, running continuously at 17us with peak at 18us.  The x1isihamx and x1iopseibsc6 processes were restarted, the CPU time is now reasonable at 4us.

This report is for 03 April 2012. Viton rim was installed on the second dust barrier. The condition of the chamber was documented and then the support tubes were inspected. Then, the tubes were picked and vacuumed. Support tube/bellows protection and dust barriers were installed. The chamber is ready for brushing.

Attached are plots of dust counts > .5 microns. I have included a plot of the mode of dust monitor 2 at end Y (H0:PEM-EY_DST2_MODE) to show when it lost communication.

Yesterday, Margot and Nicole worked on cleaning the ITMy.
While working with them I noticed divots under the metal prisms that were glued on last week by Gerardo and I, in 2 places.  We believe these are due to differential thermal expansion coefficients induced during the (what we believed to have been) low temp heating from a heat lamp.  Shown in the attached picture is one of the divots ~6mm in size under on of the 4 prism "legs".  The other divot is on the other prism (not show) and is much smaller at just under 1mm in diameter.  The prisms are not loose.

After consult with the larger SUS team, 
1) Gluing of all SUS optic/metal components is being evaluated to maintain the bonding strength and outgassing requirements of the glue joints, while minimizing the differential thermal expansion issue seen here.

2) We decided to reinforce the existing joints under the remaining legs with more glue and cure at room temp.  The VRB is being consulted vacuum compatibility of this since the outgassing step will not be complete.

These bonds were cured at room temp for ~24 hours, then the heat lamp was turned on for an additional ~24 hours.

Note that the other 2 metal/optic bonds here at LHO were performed on the TCP and the ERM and were successful.  However, we followed a slightly different procedure which called for immediate heat lamp heat for 16-24 hours.  As well, the configuration of these bonds was also different in that the prism "feet" ran the full length of the prism so the bond was much larger.  We are investigation what parameters factor into these failed bonds, and assessing the actual temperatures seen from heat lamp heating.

Scott(Apollo) & Jason

I don't have the absolute elevation worked out yet but the five shots we took on the Optical Table puts the level of the Optical Table to ±0.2mm.  If the In-Chamber leveling requirement is the same as that on the Test Stand (±100urad per E1101071); we are so very close.  The Optical Table is ~1955mm in diameter.

- SUS cartridge installed in BSC6 yesterday. SEI still has work to do (undressing cartridge, plumbing, cabling, HEPI dial indicator, assess level of support tubes)
- Installation of OMC MC tube
- CP1 and CP5 filled by PraxAir
- Sno Valley visits
- Stoneway Electric visits
- Dust monitors: #2 (EndY?) disconnected, unsure why
- Air handler at MY alarmed, possibly due to seasonal changes (no chilled water flowing at MY)
- CDS: Many reboots at BSC8 and BSC6
- OSB doors locked at 1600

The h2psl0 front end models were restarted by Michael, Jim and Vern.

The latest ISI model (and associated C code) were built using the latest trunk 2.5 by Dave and Vincent. This code was installed on h2seib8, and the original HEPI code was also started (test models from yesterday were removed).

Here are ResourceSpace links to four collections from yesterday's cartridge installation at EY.

** Part One -- Preparations
** Part Two -- Locking the Quad
** Part Three -- Flying the cartridge
** Part Four -- Landing the cartridge

You might need to sort the collections by date once or twice to see the contents in the proper order. Elsewhere in RS you might find better shots of the uncovered transmon than the video screen shots you'll see in the Part I of the collection above.

Attached are plots of dust counts > .5 microns for April 2, 2012. Note that the dust monitor at location 2 at end Y (H0:PEM-EY_DST2_5) has lost communication. I have included a plot of its mode (H0:PEM-EY_DST2_MODE) to show when.

First thing this morning, the Apollo crew headed down to Y-end to remove the man-lift that Dale used for filming the install. The engine hoist was moved from the northwest corner of the chamber cleanroom to a spot by the termination slab. 

In addition, the following items were agreed upon in a brief meeting:
-Remove jacks from chamber cleanroom (~03 April 2012, Apollo)
-Move SEI masses to E-module (~03 April 2012, Apollo)
-Remove loose vacuum line (~03 April 2012, Kyle)
-Move test stand to termination slab (~03 April 2012, Apollo)
-Assemble and customize cart for IAS (~06 April 2012, Jodi/Apollo)
-Remove CPStat from Test Stand cleanroom (At Bubba's discretion)
-Reinstall curtains on Work Space cleanroom (At Bubba's discretion)
-Move garbing/staging cleanroom to southeast corner of chamber cleanroom (At Bubba's discretion)
     *Note-This will clear the way for setting the ISCT table.
-Move TS and WS cleanrooms back into usable configuration (At Bubba's discretion)
-Re-clean cleanrooms (~05 April 2012, Tech Cleaning Crew)
-Remove appropriate port covers from south door (At Bubba's discretion)
     *Note-Need info from ISCT to make an informed decision.

- Preparing for the cartridge install at BSC6, led by Hugh R.
	- Suspensions Locking down
	- TMS being covered by a sock
	- EE guys modifying field connectors
	- Overall meeting to determine readiness
- Cartridge Landed
- PSL Table arriving today from Pacific Cascade Trucking.
- Carbon optical lever giraffe arrived from Aeroshear. 
- Sno Valley came to work on chillers (Ski)
- NorthCoast here for Ken
- DAQ cabling and hardware being rechecked at BSC8 by CDS and reboot of SEI and SUS

Unusual HF resonances/noise were observed on the transfer functions recently measured on HAM-ISI Unit #4.

Multiple configurations were tested:

1. Initial Configuration: Top Mass Sitting on 3x thin Washers, one of them was mistakenly set on an optical table track (we found the washer bent) - Balancing Masses (5kg and 10kg) stacked on thin washers too.
2. Top Mass Sitting on 3 Thicker washers instead of the thin ones. Same configuration (thicker washers) for the 5kg and 10kg balancing Masses.                        -> The unusual 126Hz and 160Hz resonances are pushed towards ~195Hz, where we saw them on the previous Units. 
3. A bolt, and its washer, that were sitting in a vertical hole of corner #3 GS13's door were removed                                                                                                -> No Noticeable Effect
4. A cable, which was possibly rubbing, was set in another position                                                                                                                                                    -> No Noticable Effect
5. The washers set under the balancing masses were removed                                                                                                                                                         -> This considerably reduced the unwanted HF resonances/noise

A presentation for the results of each step is attached.

Transfer function measurements are running overnight on the ISI in its latest configuraton.