Early this week, the work platform was moved from BSC8 to BSC1 and a regular BSC cleanroom was moved into place over the work platform. Today, the cleanroom was modified to better accommodate the existing equipment. The E-module and spiral staircase were craned into the "beer garden". (NOTE: The E-module covers the lower portion of the regular stairway: please be careful of your head. The area of concern has been covered in foam and caution tape.) The bridge from the E-module to the work platform was installed (no modification needed). An aLIGO garbing/staging cleanroom was moved from BSC8 to the top of the E-module. The green iLIGO cleanroom was disassembled so that it can be used along the in-put arm for HAM2 work since we are stealing an aLIGO garbing/staging cleanroom for the floor level at BSC1.

• X-axis Position: 0.0 mm
• Y-axis Position: 3.1 mm West
• Rotation: 246 µrad CW

  We will unstop both suspensions when the Seismic team has completed their work. 

   Andres and I put MC2 and PR2 Intermediate and Bottom Masses on light stops so the seismic team can continue to unlock the HAM3 ISI. The stops are just touching so the masses cannot move. Before stopping, some of the Bottom Mass magnets were in contact with the side of the OSEMs. We positioned the bottom masses so no magnets were touching the OSEMs. We did not have good visibility of the OSEM/magnets on the Intermediate Masses, so stopped these as best we could.      

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot. The data was taken from approximately 6 AM to 7 PM.

I ran two tests, on 9/5/12 and 9/27/12, while keeping as much similar between the two tests as possible. The RGA was kept at it's default settings, for the head 70eV electron energy and 90V focus . The CEM was operating at a gain of ~30,000. This test should probably be re-ran with a lower ionizing voltage of 50eV where Rai worked out a good range for Ne sensitivity but lower Ar++ rates. The GS-13 being tested was repaired and loaded with trace Ne here at LHO and loaded into a modified VBO-A (represented by the block diagram). 

The same GS-13 pod was tested in VBO-A without having removed it from the chamber. The first set of graphs show two 10 minute accumulations, the first peak being a 4.88x10-9 torr-L/s calibrated leak + a GS-13 pod, the second peak being a 10 minute only pod accumulation. The second set of graphs show the overlay of the two relevant peaks from both the tests and their corresponding fits. Unfortunately, for the fit I've used some normalization on the data to get the fitting algorithm to work (if anyone has some good suggestions for getting matlab to fit this without that I am all ears). The two tests calculate out to 1.22x10-9 torr-L/s 1.54x10-9 torr-L/s pod leak rates respectively.

The air leak into the chamber can be sort of fickle as my skill with sealing the copper wire is not the greatest and some fluctuation can be expected in between tests. Since these two tests were run without the chamber being opened a greater variation could be expected in between tests than this shows. Hopefully we can have some confidence in the podded seismometers going into H1 using VBO-A without having to continuously ship to and fro LLO.

We have all the vertical Actuators attached and have staged the horizontals to knock them out in the morning.  We should be ready for IAS check late morning.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot. The data was taken from approximately 6 AM to 6 PM.

Last week the Support Tubes were put in nominal position in readiness for Cartridge Installation.  The iLIGO SEI CAS elements were removed and replaced with HEPI Housings.  This required much craning, wrenching, drilling & tapping, etc.  Monday & Tuesday, the HEPI Actuators were installed, not possible once cleanroom is in place, and final securing of the housings were completed.  The SEI external structure is now ready for the Cartridge.

Before the SUS move of the Quad on the ISI yesterday, on Monday the SEI Crew removed the remaining Trim Mass Assemblies.  Yesterday, the Assemblies have been relocated along with many more on this ISI.  This installation work continues.

- Rodica, Cheryl

Testing of the FI started last Thursday, with increasing power to the IO optics on the PSL, and then increasing power through the FI.  Currently, we are running high-power tests, to measure thermal lensing with and without the DKDP ( thermal lens compensator).  In this process, we increased the power in steps, and located ghost beams in the IO path and through the FI path.  With these dumped, we proceeded to high power tests putting 140W through the IO path and FI.  Some clipping was found and corrected, however we see evidence of clipping in the beam downstream of the EOM, as measured with the beam scan.  Thermal lens measurements without the DKDP look as expected. 

Routine site inspection revealed that water is accumulating at the LN2 LLCV actuator bowl drain (point-of-use) for CP1 and CP2 -> Found that the corner station instrument air drying tower was working but that the tower regeneration purge rate valve was adjusted to ~15 psi (should be ~65 psi) -> adjusted and opened bowl drains, let air flow until dry. Will check tomorrow. 

 I torque the ITMY dog clamp bolts to 25 FtLb, as per D0901140. 

   We noise tested the 24 untested AOSEMs returned from LLO. Seven AOSEMs had lose circuit boards (positioning setscrews were backed off), which were corrected and tuned to >25k open light counts. The remaining 17 AOSEMs have open light counts over 20k counts. These will be tuned to >25k open light counts over the next few days. The open light tuning results will be sent to Stuart Aston at LLO. 

   The noise testing results are posted on the DCC under E1101030, with the individual plots found in S1203453 through S1203476.      

Thomas and I started a 2-day measurement at EY to evaluate the drift of the optical levers. For this long measurement, HEPI and ISI are controlled (no sensor correction) and SUS is damped.
If you plan to work at EY, please stop by the control room to inform the operator of the day. Your activity might trip the ISI-HEPI watchdogs and ruin the long measurement.

WP3414 WP3396

The IOP watchdog system between SUS HAM2a, SUS HAM34 and SEI HAM23 was partially re-enabled.

In the new scheme, HAM2A SUS cannot trip SEI HAM23, but SUS HAM34 (actually only the HAM3 SUS of MC2,PR2) can trip SEI HAM23.

Note that if MC2 or PR2 trip SEI HAM23, then all HAM2 suspensions lose their HPI/ISI drives.

This work required restart of h1sush34, h1seih23 and H1 DAQ. For testing I WD tripped MC2, PR2 and MC1 (to prove HAM2 will not trip SEI).

WD MEDM screen was changed to show the new layout.

All tests passed. This closes out the two workpermits.

WP3493

The IOP SUS watchdog system between FMY,ITMY and SEI BSC8 was disabled. This prevents a SUS test on one test stand from tripping the ISI test on the other test stand. This is a transition workpermit which was closed. If in the future an ISI/SUS stack is constructed on the test stand the watchdog can be re-activated.

Re-energized the following devices at the Y end station which were turned off on Friday, Oct. 5, 2012 for software debugging:

H2-SEI-C1 rack - (3) coil drivers, reset overtemp condition after powerup.
H2-TCS-C1 rack - Ring heater driver, A/I filter box.
H2-SUS-C1 rack - (3) A/I filter boxes.

We resumed analysis of MC3 Phase 2a data taken Sept 27 and found that now the sus ails from pretty severe yaw to vertical and transverse coupling.  Travis eye-balled the suspesnion and sees that it is not well aligned in Yaw.  Note, the alignment procedure during the build phase of HXTSes is all done "by eye".  I think we possibly have been aligning suspensions to the crocked side flag mount (a recent discovery).

Note to self, our recent issues with processing the plothsts_dtttfs.m script was due to file naming convention.  Watch for dash and underscore locations in the name!