Cheryl and Matt removed the teflon tips from the TMS EQ stops for the upper mass.

(Corey, Eric, Jim)

A first for me was installing the Walls right on to Stage-1 (vs building the walls as Pitchfork/Boxwork assemblies).  It seemed to work pretty well (and no lugging of 90+lb parts!).

Pitchforks

These were mainly installed on Monday, but we still had to torque one of the Pitchforks (some of the bottom bolts weren't torqued due to interference).

Keel

Installed the Keel after the Pitchforks were installed.

Boxworks & Flexure Posts

Installed the Boxworks assemblies on Stage-1.  They are not torqued.  They have one rough pass of torquing the bottom ones though.  One Flexure Post assy (Corner 2) has been installed/torqued per assy procedure.

I shut down the power to the GS13s & L4-Cs on BSC8 (ITMY) ISI at ~ 1430pdt.
I pulled the FeedThru Protection off as required and pulled the Field Cable from the ir side of the FeedThru.  With this access I connected a breakout board and checked for continuity between pin13 of the FeedThru to ground (Chamber, unpainted Crossbeam holes...)

I though we were home free until I got to the very last one (only 6 to do) where at Corner1 on the GS-13 I had no joy.  While there I checked the Air cable Pin13 and it was at ground...fwiw.

Chassis powered up ~1530hrs.

The following is an [edited] email exchange sent between members of the SUS group on May 2nd 2012. I wanted to reproduce it here because (a) I don't want to lose it, (b) it'll be good to have a hyperlinkable reference, and (c) it might be of use to the more general audience.


Jeff Bartlett wrote:
------------------
Can you lend some guidance on the proper d1 values for the HxTS suspensions, by answering what is the tolerance range for the d1s?

Jeff Kissel wrote:
------------------
We demand the machining tolerances on all parts involved, such that the final physical d's have a tolerance of +/- 1mm, and that's what we've therefore pushed to have the assembly tolerances be. 

However, to see what we've done thus far, and compare that against how d1 affects the modeled transfer functions, I attach a comparison between the 4 Phase 1 HSTSs they've put together at LLO and three models: 
d1 = (nominal+3mm) 
      2mm (Nominal) 
     (nominal-3mm)] 
   = [5mm below M1 CoM]
      2mm below M1 CoM, Nominal
     [1mm above M1 CoM]

The plots show that 
- In the measurements, the 4 SUS were built (at whatever d's they were shooting for) *remarkably* consistent. 
- All degrees of freedom except for Pitch are pretty darn insensitive to d1.
- In pitch,
	- With the tolerance set to 2mm +/- 3mm, seems to encompass measurements well,
	- The measurements match models with a more negative d1 (with "higher" respect to vertical, i.e. blade tips up, or CoM down ) better that the nominal 2 mm
	- A model with d1 ~ 0mm (or [nominal - 2mm] ) is about where all the measurements lie. This is not explicitly shown in the plots, but I started making them using a d1 of nominal +/- 1mm, and worked my way up to three, and as I passed +/- 2mm, I saw that -2 mm matched the data well.
	- NOTE: that d1 ~ 5mm (or [nominal + 3mm]) seems to nail the highest frequency Roll mode, but goes in the wrong direction for Pitch... emphasizing that the models aren't perfect. 
	 
So, in summary -- do whatever Livingston does 'cause what ever d1 value and tolerance they use results in delightfully consistent transfer function results.

Robert Giglio wrote: [On "what Livingston does"]
--------------------
I've been shooting for a d1-value of between 2 and 3mm below the center of mass and I TRY to get them within .5mm of each other.  In practice, due to the discrete nature of the clamp swaps, I sometimes end up with more than that in roll (pitch is usually spot on because I can change weight on the intermediate mass).

2 LEDs when pumped only by annulus ion pump.  Joint pumped with aux. cart for a few weeks prior to ion pump.

PSL installation team

Chiller settings changed:
The diode chiller seem to have all of a sudden a higher flow than last week. We got 31.2 lpm at fully opened chiller bypass. Since the chiller's flow interlock triggers at 30 lpm this threshold needed to be reset to 34 lpm. We recomment to reset it to 30 lpm if the flow decreases (ask LZH for technical password).

HPO alignment (see laser manual for detailed alignment procedure):
Multimode alignment (freerunning oscillator, without seed from MOPA, without 4f lenses: 62.2W @ 32 A pump current per crystal and radially symmetrical beam profile)
Fundamental mode alignment (4f lenses / pump light), HPO still freerunning (output in both directions): 160 W @138W pump power per laser crystal.
Next step: injection locking

Calibration of FE PDs:
We set the calibration value for the photodiodes inside the MOPA box (for pump powers and powers behind the 1st, 2nd, and 
3rd amplifier stage) to 100 via the Beckhoff laser control screen.

Cable pulling for components on optical table (PMC, ISS, FS, DBB, Photodiodes/CCDs, etc): ongoing

Over the past few days we've cabled up the ALS table and the field rack at EY.  Using the diagrams in D1100670-v6, things are very close to finished.

All but four of the cables on the ALS table are connected (on the table-end).  The four cables missing are for the CCD camera (power & video out), the EOM RF input, and the fiber input from the "PSL".

The following boards are missing from the field rack:
VCO
iLIGO LSC RFPD Interface
Uniblitz shutter controller

All of the cables for the existing boards in the field rack have been landed.  The missing cables are for the RF connections from the oscillators in the high-bay to the RF patch panel and a few other things.

On the CDS high-bay side, none of the slow controls cables have been connected to the Beckhoff EtherCat chassis; I would prefer not to plug things in until we have looked at software models, etc to make sure we're not driving picomotors, PZTs, and so on with garbage signals.  But soon, soon...

Some notes:

 - in the ASC Demod Concentrator (D1100696), there are two controls outputs ('A' and 'B' on the rear panel), but in the cabling diagram there is only one cable (Cable 78).  I think there should be two since we've got two WFS; Cable 78 is currently connected to the 'A' slot.

 - For the picomotor driver, we've connected CAB_H2:ISC_WBSC6-64 to the readbacks, and CAB_H2:ISC_WBSC6-13 to the controls.  Note that cable 13 isn't in the final cable layout, but it had already been pulled, so we used it anyway.  Should have been CAB_H2:ISC_WBSC6-65.

 - All of the cables were too long - which is better than the alternative!  We had about 12 ft of excess on the ALS-table-to-field-rack connections, and many many feet of excess on the field-rack-to-high-bay connections.

HAM ISI #6 Work (Corey, Hugh, Jim)

Finished off prep work(helicoiling & pressing pins) for Stage1 Walls.  Have started installing the Pitchfork Walls on Stage1.

One of the Lockers looks to be a wee bit tight.  We'll need to keep an eye on it, after it gets used.

I took over the afternoon part of shift, due to a sick Patrick.  Here are some of the afternoon activities:

BSC6

• Vincent ran a few measurements related to a possible rubbing issue
• Jim is now at BSC6 to investigate the rubbing at the chamber

Misc

• Restarting h2iscey (Jamie).  This also required reboot of DAQ
• Hanford Emergency Preparedness called the Control Room to confirm that this was the number they should use for contacting LHO during an emergency
• A few MINOR & MAJOR Dust Alarms at EY; most were short-lived

In the desire to be able to do some repair and testing of podded seismometers I have retrofitted VBO A with a Neon calibrated leak, a LN2 cold trap, and a cold cathode pressure gauge. Unfortunately the LN2 cold trap uses a viton seal, so its two valves are to isolate it from the normal bake oven operations. Pump down should be able to begin tomorrow for leak checking and maybe even a test.

Vincent launched the SUS ITMy TFs which should run for the next 7 hours tonight.  Thanks, V!

Hi all,

After several talks with Jeff Kissel and the LHO SUS team, we agree that a procedure for testing is needed.
With my little understanding, it seems that every type of suspension goes through 7 different steps:

1. Set up the offsets and the gains for the OSEMs in the MEDM.
2. Centering the OSEMs.
3. Static test (to check out the sign of the OSEMs)
4. Linearity test
5. Diagonalization
6. Quick transfer functions with DTT
7. Full set of transfer functions

What I'm trying to do since the beginning of last week is to have one/several scripts for each of these steps.
These scripts would be generic and work for all type of suspensions.

My ambition is to have something where the user just have to push the run
button to have the results.

I created two folder in the SVN:
/ligo/svncommon/SusSVN/sus/trunk/Common/Channels_lists/
/ligo/svncommon/SusSVN/sus/trunk/Common/Generic_Testing_Scripts/

So far I have worked on several scripts which are working fine, but still need a little bit of adjustment (please don't touch them for now !).

I will be at LHO until the end of the week. Before my departure, I will put all the informations about those scripts and how it could work (if everybody agrees) in a procedure.

Cheers,
Sebastien

We installed the Beckhoff slow controls computer h2ecatey at EY yesterday. This is a windows 7 32 bit Beckhoff computer, it is attached to the H2 slow controls network (formally known as the H2 PSL network). We verified it can be remotely controlled using remote desktop from the control room. It is also remotely controllable via its IPMI management port. The computer is located in the H2 front end rack, and is attached to the KVM.

Its ether cat interface was connected to the Beckhoff End Link Chassis.

After Alberto and Dan re-aligned the ALS beam to the periscope, Dan installed a retro-reflector and we aligned the pick-off beam into the HWS path. There was ~120uW of power getting into this path. The concave lens that Dan substituted in last week is AR coated for 1064nm, so there is a 10% reflection off the surface of that which is hitting the inner wall of the enclosure.

There is a second wedged uncoated 2" optic (uncoated on front surface, AR coated on the back surface) in the HWS beam path that is used to further attenuate the beam. There is a 10% reflection off the front surface and a 1% reflection off the back surface. (The 10% beam was significantly saturating the HWS camera, so we settled on using the 1% AR beam).

We aligned the rest of the optics to get the 532nm beam onto the HWS. The incident power was ~1.2uW. With two OD 0.5 filters in front of the HWS, it was only just saturating with an exposure time of 9ms (and dead time of ~8.5ms between exposures).

We removed one of the OD0.5 filters and set the exposure time to 1ms, (with dead time of 16.5ms)  to only just saturate the camera (although this produced streaking in the image that is characteristic of long dead times). From this I estimate that we'll want roughly 50x attenuation to get the camera to run at 57Hz with no significant dead time between exposures.

I installed the TCS SVN on the HWS computer (called h2hwsey) and recorded some of the images from the camera to the SVN.

Here is the first aLIGO HWS image ever ....

The suspension anti-imaging chassis (D1100815) has a mislabelling on it's front panel.  It has three outputs on the front panel but they are labeled "IN 1-6", "IN 7-12", and "IN 13-16".

Furthermore, the actual schematic for the AI interface board also lists the channels in the connectors as inputs.

This is a project-wide issue, not specific to H2, but I discovered it in the H2 EY electronics rack, so I'm reporting it here.

The schematic and front panel drawings should obviously be fixed, but I also really think we should replace the panels on all the manufactured units, including the ones that are deployed.  It's confusing and potentially dangerous to label outputs as inputs. 

 The 120ft cable H2:TCS-HWS_EY_CAB13 was strung between the D1200168 Beckhoff breakout box situated above the in-air ALS table (first picture) and the D1100682 EtherCAT Chassis in the CDS high bay (second picture). Thomas and I tested the pin-outs and confirmed that there was approximately 115 Ohms across pins 1 and 20 and pins 2 and 21 from the first 4-wire RTD and roughly 120 Ohms across pins 3 and 22 and pins 4 and 23 from the second 4-wire RTD on the in-air table. This cable was plugged into the back of the EtherCAT chassis in the TCS/Hartmann Sensor slot. 

When the TwinCAT System Manager software is fired up for this EtherCAT chassis, we can see the temperatures for the two sensors reported in Terminal "H2 End Station 2 L16 (EL3202-0010)" in channels 1 and 2, approximately 20.90C and 31.86C, the table and Hartmann sensor camera temperatures, respectively.

(Corey, Eric, Jim)

Stage-0 Moved On To Test Stand

Positioned via threaded rods on Test Stand (we DID NOT put nuts on these).  Dowel pins installed on Support Posts; still need to break tangs off of helicoils on Posts.

Stage-1 Moved On To Test Stand

Starting to helicoil it.

Prepping/Building Stage-1 Walls

These Walls need helicoils installed and dowel pins pressed.

Jim W Greg G

BSC 6 has had the NW and NE vertical and horizontal actuators mounted to the foot. The SW and SE corners have only had the vertical actuators mounted while the horizontals have yet to be mounted. The lack of room and a few technical issues have made the work a little frustrating. We should be able to finish as soon as End Y returns to laser safe.

For the record, these are the things I know of that need to be done in the chamber before putting the door on:

0) Can someone please take FM TFS to see if rubbing is a problem there)?  <---  Team SUS Testers
1) Investigate and fix any ITMy rubbing identified by TFs ran Wed night or last night (waiting for results)
2) Fix any FM rubbing.
3) Reweight ACB
4) Remove TFE stop brackets
5) Take picture - EQ stop scratch marks on ITMy for Giles
6) Remove FirstCOntact - get N2 bottle
7) Set EQ stops and lockdown all nuts
8) Set witness plates?
9) Lock down flooring
10) Remove all tools - including any ACB brackets that they might decide to put on...