The two steering mirror assemblies, D1101851, are installed in BSC2. They went in fairly smoothly. One hitch is where the support bracket attaches to the chamber's lower bracket; the weld from the lower bracket to the chamber wall kept the two surfaces from mounting flush.

The two mirrors are NOT installed yet. They oxidized during their bake and I am still working on figuring out if anything should be done about that. The mirrors shed a little, but it seems as though they are not shedding anywhere near the level that the chamber itself is.

We set up Viton Pads under HAM3-ISI balancing masses. The size of those pads is the same as the size of LLO's. However we set those pads under 1/2 the mass LLO uses, in order to rise the corner frequency of the mass+Viton stack.

Comparison before/after is attached.

The Viton Pads improve the 310Hz peak in V efficiently, by a factor > 5 without any drawback to it. Results are satisfying enough for now. We may try other configurations next time the chamber is open.

08:00 Reset all the alarm handlers 
09:30 Start measurements (Transfer Functions) on HAM 3 ISI – Hugo P
10:45 Start/Continue assembly work on H2 LAE PCAL – Pablo
12:10 Work (Inspection)on LVEA main crane – John Worden
13:45 Cable work by HAM 4 on the LVEA – Filiberto C.
14:49 LVEA Transitioned to Laser Hazard - Cheryl
15:00 IO Alignment on HAM2/HAM/3 in the LVEA – Cheryl

Restarted the DAQ at 15:14 and 15:17. Added all h1seib3 systems (IOP, ISIITMX and HPIITMX). Also added back the ECATC1.ini EDCU file to support slow controls commissioning.

Needed two starts, three of the Beckhoff channels do not seem to exist and were commented out.

Measurements are complete on HAM3-ISI. The Apollo crew can proceeed there.

Crane work continued:bearings for main crane arrived, one installed and packed; still working on X End crane.
HIFO-related viewport checklist being worked.
Test Stand cleanroom transported from Y End to X End. Frame re-assembled.

Gerardo finished up the optical lever periscope for the BS.
The  Y-arm baffle is aligned. 
The  Y-arm baffle needs to have the brackets removed to fully suspend it...do not forget this
The  X-arm is not aligned due to the mounting bolt pattern issue he encountered
The platform remains inside under the X baffle
IAS needs to finish breaking down our equipment and stowing it

Seismic is currently running an experiment at HAM3 to determine whether we want to use more viton on the HAM ISI. This means there are 3x 10kg masses that are not bolted down on the optical table. These masses are sitting on viton pads, while Hugo runs a transfer function. If sub-systems are entering HAM3, please watch out for these stacks, as moving them could disturb the balance of the ISI. The relevant stacks are pretty obvious as I put the old mounting bolts in the top masses, to keep the weight properly distributed, as pictured.

- praxair
- DAQ reboot
- IAS in BSC2
- viewports going on the spool near HAM3 - work will continue tomorrow/this week
- AOS in BSC2
- oplevs working in BSC2
- dust monitor 14 restarted for H2 PSL enclosure
- dust monitor code upgrade being tested on OSB optics lab dust monitors
- pcal work in H2 PSL enclosure - done for today

The Y-Arm elliptical baffle is aligned within spec. < 3mm lateral and vertical

However, the X-arm continues to give us mounting errors. This may require the mounting base to have existing holes elongated in order to mate up with the threaded holes on the stage "0" or at least an investigation into why we are unable to fit it up in its aligned location. 

If holes need to be slotted we will loose a week with the dissembling, modifications, clean and baking reassembly and installation.
A week longer for the spool to be out.

Another option may be that we can remove the baffle modify it and reinstall and align it just prior to installing the ITMx while we have an open path.

I will notify Calum, Lisa, Mike Smith, Mike Landry and Brian as LLO may see the same problems

Memo to self:

Since the HAM3 oplev mirror was installed after the POP/ALS path alignment was done, and since Thomas wasn't aware that there is a beam path there when he installed the oplev mirror, I asked Cheryl to check if the oplev mirror mount is occulting the POP/ALS path next time she goes to HAM3.

If both oplev mirror and POP/ALS steering mirror are at the location specified by D0901094, it should be OK.

We ran transfer functions on HAM3-ISI over the weekend. They look good and clean. They are in good agreement with what we measured prior to the IMC test in December 2012. 

Transfer functions are attached.

Note: one can notice that the amplitude is going up in higher frequencies, on the most recent measurements (GS13s). This is due to the fact that the sample rate at which the Actuation Signals are stored on the DAQ was divided by two (now 2k), while it remained the same on the GS13s (4k), since previous measurements. 

Crane work continued: snap ring installation on LVEA main crane-one bearing still missing,visual check complete on LVEA East Bay crane and crane released for service,  X End crane making noise so problem-solving is on-going.

Y End: Dis-assembly of Test Stand started. Bolts on BSC6 torqued.

Helped T. Vo needed help with parts, M. Rodruck needed help with PCal assembly, and C. Vorvick needed help with install.

Today Dick assembled the DC PDs we needed and Filiberto and Aaron added some cables so that we could get the PDs going tonight.  

I leveled the beam and aligned it along the bolt holes, and added the PLCX-50.8-309.1 16 inches from the bottom periscope mirror, and the f=143 lens 10+1/4" after that.  This resulted in a waist of 16 um, by moving the 2 inch lens back 6 cm I got a 18um waist, the measurements are attached.  In these plots 0 is 394 mm from the inner edge of the enclosure walls.  

I then installed the crystal, which was labeled 1x1x10mm PPKTP but was not square but rectangular.  It was in the box mounted in a holder that must have been part of the comerical SHG oven.  I tried to align the beam through the crystal, but it was difficult to see what I was doing so the crystal position might need adjusting.  We will need another lens right after the oven because the beam diverges quickly after the 18um waist.  

I did not optimize the temperature, but measured 67 uW of green produced.  

Attached are plots of dust counts requested from 5 PM April 14 to 5 PM April 15.