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.

Transfer functions are running overnight on HAM2-ISI. Jim pulled the covers away witht he metal rods taken from HAM3. Covers should not rub against the ISI this time around.

B&K hammer test was made monday and tuesday last week with Betsy and Travis on HAM2 and HAM3 chamber for MC1-MC3-PR3-PRM-PR2 suspensions

The measurements have been taken with :

• HAM2 and HAM3 ISI tables locked and suspensions unlocked
• PR3 and PRM vibration absorbers (VA) consequently on and off
• MC1 MC3 PR2 VA on

Pictures attached are showing position of the tri-axis accelerometer, and hammer hit locations for : 

• Picture 1 : MC1
• Picture 2 : MC3
• Picture 3 : PR2
• Picture 4 : PR3
• Picture 5 : PRM

The following pdf document shows the different measurements, with comparisons between VA on / off for PR3 and PRM, and comparisons between LLO and LHO measurements.

As required for the ISI tables, resonnances of the structure below 150Hz (marked by the black dotted line) are damped by the vibration absorbers (page 9 to 12 to see their effects on PRM and PR3)

Data have been exported and plotted following the operations manual wikipage.

Phase 3a transfer functions have been running last friday on PR3 supension. Transfer functions are consistent with model.

First pdf shows TFs with damping on vs model, the second one shows TFs with damping off vs model

PRM was left in it's parking position after IO work last week, and this was disruptive to transfer functions last Thursday.  Today I put PRM into it's aligned position, so new transfer functions can be made.

The PRM PARKED position, which sends the IFO REFL beam out a viewport atop HAM2, is:
P = +2500 urads, which is    4688 in counts of drive
Y = -6000 urads, which is -16084 in counts of drive

The PRM ALIGNED position, which sends the IOF REFL beam into HAM1, is:
P = +2000 urads, which is 3750 in counts of drive
Y =     +50 urads, which is   134 in counts of drive

Aligned snapshot of the medm attached.

Prior to HAM3 chamber close up, PRM transfer functions have been running last friday.

The attached pdfs show :

1. Comparison between last TF damping on and model
2. Comparison between last TF damping off and model
3. Comparison between last TF LHO damping on/damping off and LHO phase 3a (in march 2013)
4. Zoomed version of 3

Measurements are consistents with model and previous data, and PRM has been approved for Phase 3a testing

0730 Justin refilling xtal chiller in diode room
0900 LVEA transitioned to Laser SAFE
0920 Filiberto pulling cables along HAM 2/3
0930 Thomas working on OpLev near HAM 2/3
0945 Cyrus to EX
1015 Cheryl torquing bolts HAM 2/3
1020 Arnaud taking quick measurement at BSC2
1030 Gerardo working on periscope and baffle alignment @BSC2
1250 Arnaud taking spectra at PRM
1350 Pablo and Michael R working on periscope assembly in H2 PSL enclosure

Prior to HAM3 chamber close up, MC3 transfer functions have been running last friday.

The attached pdfs show :

1. Comparison between last TF damping on and model
2. Comparison between last TF damping off and model
3. Comparison between last TF LHO damping on/damping off and LHO phase 3a (in december 2012)
4. Zoomed version of 3

Measurements are consistents with model and previous data, and MC3 has been approved for Phase 3a testing.

The only particularity to notice is that the damping in YAW doesn't provide much effect

Prior to HAM3 chamber close up, MC2 transfer functions have been running last friday.

The attached pdfs show :

1. Comparison between last TF damping on and model
2. Comparison between last TF damping off and model
3. Comparison between last TF LHO damping on/damping off and LHO phase 3a (in december 2012)
4. Zoomed version of 3

Measurements are consistents with model and previous data, and MC2 has been approved for Phase 3a testing

- Cheryl, Chris (Apollo) 

HAM2 and HAM3 IO component bolts are now torqued to spec.  The actual inch-pounds is unknown, as we were working at the end of the range of the torque wrench.

I checked the 1/4-20 bolts that are holding down cables and found a couple in each chamber that were loose - IO and SUS.

I found a couple IO 1/4-20s in HAM2 that seemed to be over torqued, and backed out one of them.

This clears all of the known IO mechanical changes needed before close-out - HAM2/3 given back to SEI.

HAM's 2 & 3 are locked for AOS closeout. BSC2 is unlocked, but it looks like we have a bad CPS there, so we may be locking again shortly.

Beamsplitter transfer functions have been running over the weekend in order to fix any issues during the day if needed.

The attached pdfs show :

1. Comparison between last TF damping on and model
2. Comparison between last TF damping off and model
3. Comparison between LHO damping on/off and LLO phase 3a (feb 2013) TFs
4. Zoomed version of 3.

Vertical degree of freedom is noisier than expected between 1.5 and 3Hz (3rd page of each pdf).