(from Betsy on behalf of Keita, Cheryl, Travis, Gerardo, Jason)

This afternoon:

• the ring heater was closed and tightened in place (new tools worked fine on the nuts)
• the TMS alignment was checked to be good
• the ETMy optical lever beams were identified
• the IAS horizontal periscope was removed
• the flooring was tightened down (added the remainder of the bolts)
• tools, stools, etc were removed from chamber
• 7 witness plates were placed in the chamber and manifold area
• EQ was removed from outside of chamber door areas to facilitate door replacement

Attached are plots of dust counts > .5 microns.

I performed the last checks (Spectra, static tests, pressure sensors checks, CPS offsets) on the ISI before the chamber closeout at BSC6. I started a last set of transfer functions for the night on ISI-BSC6 while Jeff.G is measuring L2 transfer functions on ITMY.
 

See report 2979, it happened again.

we took the opportunity to ingest the ITMY optical lever signals into the ITMY SUS model.

D070081 S1102755, the e-traveler of which is available here: https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=58957. 

Cheryl posted morning activities (below).

This afternoon's work:

• David B:  ITMy Model rebuild (to include Oplev)
• Cheryl:  Ring Heater work
• Keita:  Taking EY to Laser Hazard (after Ring Heater work) for TMS work
• FMy died for a second time today (due to noisy LVEA?).  Dave will power-cycle FMy after ITMy work (since restarting FMy will kill ITMy).

(corey, eric, greg, hugh,  jim w, mitch)

#5

Last couple of days, we have prepped this ISI to put it in a box.  This afternoon, this ISI should be canned for your enjoyment.

#6

Not much going on with this assembly since we are waiting for hardware for the Actuators and CP Sensors.  I installed the CPS Sensor Heads on their mounting hardware (the mini-racks are on floor under the ISI).

#7

Optics Table has been de-tanged & now removing broken tangs.  Stage-0 can be put on Assembly Stand as soon as #5 is boxed.

The entire HAM (minus the fins) was brushed today. One drill was used. The crew shut down early to head to safety meeting.

Robert Schofield asked for a controlled experiment to document the behavior of chamber cleaning wipes when exposed to air. Random samples of three types were pulled from various sections of BSC2: last wipe (isopropanol soaked), glove wipe, and dry wipe. The wet "last wipes" are hung up in the OSB Optics lab on a wire strung across a flow bench. Please do not disturb the wipes.

Morning:
Betsy and Travis at EY
Dave/Jeff software issues fixed to allow ITMY to damp
Huge at BSC8 changing protection for the cables (trips ISI but not SUS)
Some spikes in dust, but all recovered quickly

The H2 FMY front end computer (h2susb78) sent IPC Dolphin error glitches which IOP tripped the SEI for BSC8 in several separate occasions between 9am and 09:30 this morning local time. At 10:10 the front end locked out, no ping, no ssh, console stuck at last log message. All lights looked good on the front end, but the only recovery was to power cycle the computer. This in turn crashed h2susb478 (ITMY front end) because of the Dolphin drop out. We took the opportunity to recompile the SUS ITMY model since it had not been built since Apr 11th and was missing the DACKILL part (RCG branch 2.5 build).

I took the opportunity to rebuild the temporary optlev model to make it generic. A H2 DAQ restart was also performed, the master file was changed and the OVERVIEW medm regenerated.

The cause of h2susb78 problems is not known, but there is some work progressing around BSC8 at the times in question.

HEPI:
Last week, the L4C gain of the pier modules were increased from 22 to 333. The transfer functions measured over the week end showed that this new gain is appropriate. No saturations on the L4Cs during the measurements.
I will start to work on controllers for the HEPI pretty soon.

ISI:
This morning, I fixed the isi2stagemaster.mdl and recompiled ISI-BSC6 and ISI-BSC8 due to an error mentioned in a previous aLOG.
I installed the new aLIGO BSC-ISI matrices freshly computed. I posted them in the SVN at /BSC-ISI/Common/Basis_Change_BSC_ISI/aLIGO/Matrices/Y/aLIGO_BSC_ISI_Matrices_Direction_Y.mat
I installed using one measurement:
- Symmetrization filters (actuators, geophones)
- Damping filters (stage 1 and 2)
- Blend filters (basic filters with a blend at 750mHz).
- Isolation filters. I haven't spent time on tuning. The goal is just to make sure the scripts and the model are ready. (UUG=15Hz, comfortable gain and phase margin).

I have attached spectra of the ISI undamped and controlled:

• LHO_ISI_BSC8_ASD_m_CART_ST1_L4C_Undamped_vs_Isolated_2012_05_29_172914.fig
• LHO_ISI_BSC8_ASD_m_CART_ST1_L4C_Undamped_vs_Isolated_2012_05_29_172914.pdf
• LHO_ISI_BSC8_ASD_m_CART_ST2_GS13_Undamped_vs_Isolated_2012_05_29_172914.fig
• LHO_ISI_BSC8_ASD_m_CART_ST2_GS13_Undamped_vs_Isolated_2012_05_29_172914.pdf

Every hour on the hour a copy of the INI PAR and FILTER files are copied to the LHO CDS web server. The URLs are:

https://lhocds.ligo-wa.caltech.edu/exports/running_config/h1/daqfiles/

https://lhocds.ligo-wa.caltech.edu/exports/running_config/h1/filterfiles/

https://lhocds.ligo-wa.caltech.edu/exports/running_config/h2/daqfiles/

https://lhocds.ligo-wa.caltech.edu/exports/running_config/h2/filterfiles/

Attached are plots of dust counts > .5 microns.

Jason, Travis and Doug,
Jason measured the ETMy pitch just prior to the First Contact removal from the H2 ETMy optic.
the pitch was 629urads down (req is 639 urads down)

After the first Contact was removed it change to 379 urads down (a change of 250urads)

This is near what was predicted for a 1.74g weight First Contact coating.

Note: This was not accounted for on the H2 ITMy or measured.

We should possibly measure this for each optic or compensate for it in the calculations as we will also be adding additional weight with the new plan for using First Contact which will remain in place until just before we close up.

Vern, Hugo,

During the chamber side testing HAM-ISIs are locked. Part of the testing consists in measuring the DC voltages outputted by the CPSs to make sure that the probes and the electronics are still functional. This measurement is taken at the BNC output of the ADE boxes. 

We recently observed that the voltages we measured depended on the number of probes that were connected to the ADE Boxes. We also noticed that the voltages measured with only one probe connected to the ADE boxes were high in comparison to what we expect on a locked ISI.

Vern and I investigated it this afternoon: 

• The CPSs have a driven shield. This driven shield is exposed on the BNC connector of the in-air CPS cable (feedthrough side). Accidentally grounding this shield to the test stand would significantly affect measurements. To avoid such situation, we adjusted the position of the feedthrough to make sure that this driven-shield could not get in contact with the test stand. 
• We bolted the ADE boxes together to make sure that they share the same ground.
• We grounded the ADE boxes to the test stand.

The voltage measured at the BNC output of the ADE boxes would then match our expectations (0V +/- 4V), without varying with the number of probes that were connected.

We tried disconnecting the grounding cable between the test stand and the ADE boxes. The DC voltage read on the ADE boxes increased and became dependent on the number of probes that were connected, again. This latest observation confirms that the issues we experienced on the CPSs were related to the grounding of the ADE boxes.

conclusion:

• ADE boxes need to share the same ground. 
• ADE boxes must be grounded to the test stand of the ISI. 
• Not having the ADE boxes grounded to the test stand cause the CPS readouts to vary with the number of probes that are connected to the ADE boxes.

Voltages and noise spectra were re-measured for each CPS and HAM-ISI Unit #4 (HAM2) chamber side testing report is being updated.

Pictures are attached

Kyle, Gerardo 

Summary ->  
Looking for large leaks -> We found a total of (7) leaking conflat flanges that will need to be addressed (>10-6 torr*L/sec typical).  In all cases, these were the large 10" and 12" joints and not the smaller feed-through joints.  We wrapped the leaking joints in RED UltraTape for indentification.  Also, both O-rings of the septum between HAM3 and BSC2 are leaking (inner high 10-4 torr*L/sec, outer mid 10-5 torr*L/sec), these are the O-rings on the BSC2 side which are integral to the septum plate.  


Kyle 

Vented H1 input MC