Transfer functions were measured on HAM2-ISI overnight. They show good concordance with their counterpart at LLO*. 

Linearity test is clean and slopes are within requirements (variation from average <1.5%).

All other tests are satisfiying. 

SEI is comfortable closing up this chamber too.

Note: One should be careful not to touch the cables that make a loop from Stage-0 to Stage-1 when closing up.

* LLO measurements were taken with PR3 on.

Performed port scans on CDS, H1FE and H1AUX VLANS. Had problems scanning H1SLOW and ADMIN.

Relocated the cdsadmin machine from H2 building to MSR.

- Travis, Cheryl

MC1 had significant bias settings in both pitch and yaw after aligning it to get the mode cleaner flashing.  These were zeroed by moving the pitch adjustment mass, and tweaking the blade springs.  OSEMS were recentered.

MC3 OSEMS were recentered.

This morning I'll get a good MC alignment while I have access in HAM2 if needed, and verify the health of the changes we made yesterday in regards to alignment.

Mark B.

Starting TFs on MC2 and PR2.

- tumbleweed baler started at 8:00 am along X-arm.  Baler was moved near the large access door for the LVEA, then to the front of the OSB by late afternoon.
- Unifirst change site mats.
- Ace port a potty drove in a drove out due to tumbleweeds.
- Apollo installated a couple of glass viewports on input tube.
- Removal of FC MC optics, see Betsy's entry below.
- Apollo is installing the East door on HAM03.

We ran a quick set of transfer functions on HAM3-ISI. We focused on the 500mHz to 5Hz frequency range. Results are a bit noisy due to a lack of averages, but they show good concordance with what we expected.

SEI-wise, doors can be closed on this chamber.

* Barring one more round of TFs.

Today, we finished locking nuts and tweeking OSEM centering on PR2 and MC2.  The MC2 closeup task-list took a side trip as we had poor cable connection of the L2 external cable both at the satellite box and at the feedthru on the chamber at the other end.  I called in the calvary who helped us hunt these joints.  Meanwhile, I attempted to remove the FC from PR2.  The AR sheet came off without a hitch.  The IAS-compatible HR sheet tore in many places leaving only the ring of the sheet in my hand when I was done.  The central portion of the sheet was too thin the pull so was torn in from numerous directions and would not lift off.  I reapplied FC (using the red "nail polish" bottle) over the torn sheet, added a PEEK tab and waited an hour before pulling again.  It came off.  There are still a few wisps near the edge of the sheet which did not come off, but I left it alone for now.  We won't use this optic until after the next vent so we'll revisit cleanup then.

Travis and Cheryl also spent some time adjusting mechanical pitch on MC1 to reduce the amount of electronic bias used.  CHeryl will re-check MC flashes in the morning.

[Volker / Kiwamu]

 This morning I went in the PSL room with an escort of Volker to replace a PD in one of the ALS paths. The PD (PDA100A) that had been in the ALS refcav transmission path [1]  was replaced with a Thorlabs SM1PD1A as designed. The output DC current from the new PD was about 0.36 mA when the laser light is on the PD. Note that I used a standard Fluke digital multi-meter for reading out the photo current. So no DC bias was applied on the diode.

[1] LHO alog #4721

JimW, HugoP

The 200lbs mass stack used to account for the missing PR3 apreared to be causing unwated resonances around 113Hz. We could hear the bottom mass tilting against the optical table when being hit. We untorqued the stack and put a folded alluminium strip under its problematic corner. Everything is torqued down. We cannot hear the mass rocking anymore.

2 potentially rubbing cables were found on the North and South sides. They were adjusted.

HAM2-ISI is locked so suspensions can be adjusted in pitch. It will be unlocked to pursue testing afterwards.

Volker Q.

I re-setup the OSA on the optical table and measured the modulation indices.  This was done to ensure that the recent cleaning of the modulator crystal did not have any adverse effects on the performance of the modulation.

The previous measurements are described here. This time I only measured the modulation depth on the center frequencies.

The sideband height was measured with a OSA on the PSL table. The frequency is the modulation frequency in MHz. All three modulator inputs were driven with 10Vpp (in 50ohm).

Carrier: 220mV

The values look reasonable close to the previous set of measurements

[Michael R., Volker Q.]

The reflections of the main beam of the the AR surfaces of the HAM window are accessible (under certain conditions, see here) and provide a reference for the beam coming from the PSL table.

We marked those beams, yesterday, Monday the 17th, on the PSL enclosure wall.  See picture below.

There were two weak and two very weak spots visible.

- Deepak, Cheryl

A camera was set up to look at the IM1 (SM1) transmitted beam, using the C3 door cover as a target.  MC1 was off in alignment, due to coming off earthquake stops, and required a pitch slider value of -4170, and yaw slider value of -2880 to get good IMC flashing.  MC2 and MC3 were initially unchanged, and MC3 was only tweaked at the end to optimize the modes coming from the IMC.  HAM3 was locked and HAM2 was floating during the alignment.

 Old values for MC1:      P =   -840, Y =   -320
 New values for MC1:     P = -4170, Y = -2880

After talking to Mark Barton, it seems like it would be good to have the SUS team adjust the pitch of MC1 to reduce the drive we need.

I set the gains on Roll/Pitch/Yaw for MC1, MC2, and MC3.  The values were low and the optics were effectively not being damped in those degrees of freedom.

Final alignment attached.

WP#3607 Mark, Hugo and Dave

at 10:42 the models h1susmc1 and h1susmc3 were restarted on h1sush2a. The new models reactivated the IPC based watchdogs between these SUS and ISI on h1seih23.

•	Tumbleweeds completely blocking access to X and Y-arms as well as the main entrance to the OSB. Weather station at EY reported max wind velocity near 
        80 MPH early this morning.
•	Mid Columbia Forklift onsite to examine green forklift and turn various bolts with various wrenches and nod approvingly.
•	0900 - LVEA to laser hazard for Cheryl (mode cleaner) and Michael (PSL).
•	1020 - Hugo and Mark B connecting SUS and ISI watch dogs; restarting H1 SUS models.
•	1345 – Hanford Fire Dep onsite to inspect panels.
•	1330 - Bubba and crew prepping equipment in LVEA for septum removal at Ham 9.
•	1415 - LVEA returned to laser safe.
•	1530 – Kyle torquing bolts on conflat for HAM 3

The H2 daq system has been shut down.  This includes h2dc0, h2nds0, h2nds1, h2fw0, h2fw1, h2ldasgw0, h2ldasgw1, h2boot, and h2build.  This shutdown is permanent, all but h2boot and h2build will be reused to create a DAQ system for the X1 DAQ test stand.

No online data will be available from the h2 system using h2nds0 or h2nds1.

Old data will be available using NDS2.

Results of windstorm around OSB and arms. Pic 015 is the top 12-14" of the mast on Big Red forklift.

(Corey, Keita)

My mode-matching lessons from master Jedi Kawabe continue with the building of the EX Green QPD Sled.  This Sled is one of two on EACH Transmission Monitor Suspension (TMS); the other is an IR QPD Sled (to be assembled next).  We actually built this Sled twice.  After completing it the first time, Keita noticed, "this sled looks like EY.  It's supposed to be a mirror image!"  It was all a learning experience.  So, we ended up re-building the sled (it went much quicker since we, in essence, already had an assembly dry run).

Once the Sled was completed, we draped wipes over all optical components, wrapped the entire assembly in foil, double-bagged it, and placed the entire thing in a large plastic bin for storage under our Optics Table in the Optics Lab (the HAM1WFS Sled is also stored here). 

Keita has plots and data from our mode matching measurements and will post a more thorough document about our EX Green Sled work to the DCC.

Note:  The "J-Clip" Black Glass Beam Dumps on our Steering Mirrors are tough to install.  There's a screw on the mount which interferes with the J-Clip and makes installing/removing these parts tough.