(Corey, Jeff, Jim, Mitch)

Workspace Converted From HAM -> BSC

Over the last 3-4 weeks, the SEI Cleanrooms were cleared of HAMISI parts/hardware/tooling to make room for BSC work (this involved TONS of wrap/bag/tag & organizing).

Stage2:  Optics Table

Helicoils were completed last week (installation & tang-breaking) on the bottom-part of the Optics Table.  We are now waiting for fixturing to flip the Table over.  We will then install the Top-part of of the Optics Table

Subassembly Work Begins:  Enter Actuators & Lockers

Parts and hardware for the Actuators and Lockers have been unwrapped and staged in our Cleanroom racks.  Have begun helicoiling parts for the Large Actuator.  A few issues:  5/16-24 helicoils were inadvertantly installed on parts.  The correct 5/16-18 helicoils are being installed---a first fit-check shows that the bolts are really tight in these helicoiled holes.  We do not have a tool for installing #10-32 helicoils--it is on order.

This activity has enlightened us to the complexity of keeping track of hardware, and the importance of bagging/tagging parts correctly (and also paying attention to the names written on bags).  We are missing a couple of items, but we are addressing these issues as we go.

Stage0 Work

- Blade Posts are loosely installed (still waiting on big 1/2" socket to torque down bolts). 

- Torqued down Stage0 (wrench-tight) to the Test Stand via threaded rods/nuts (note:  one of the nuts was not installed because the threaded rod had bad threads).

- Level of Stage0 was checked---it is level to within 0.005"

HAMISI#3:  Moving Out

It has been decided we will postpone testing on this Assy.  (So, we'll need to put a few days into removing GS13s, payload, cabling, etc. on this Assembly.  It will eventually be pulled out and put into a storage container---once the container is modified for use).

Throughout the day:
HEPI post install prep on HAM 7
HEPI pier install on BSC 4
Ski to outbuildings to turn fans off

10:20 - kyle to vent x-mid

11:00 – contractors here to work on modular building

11:03 – contractors to work on H2 PSL room

~2:00 - Filiberto replacing network cable in LVEA

~3:00 – Swageloc order for Hugh arrives

Changed pre filters and greased fans in the out buildings

Finished attaching the support brackets on BSC 4. The old iLIGO stack on the SE corner was cleared out. The SE pier is far enough out of center from the crossbeam that the HEPI frame would have interfered with the side clamp. Another hole was drilled to allow the clamp clearance (photo 1).

Holes were drilled in the enclosure roof for bolting the air conditioner units. 1-1/4" PVC pipe was set inside the holes and caulked into place. Outside the LVEA, the compressers were set into place. On Monday the air conditioner units will be installed in the enclosure.

Dust counts were elevated later in the day, with counts above 5000 at 0.5 micron, but the HAM7/8 surveying work was near the dust monitor, so the increase in counts may have been due to people standing nearby.

• Spool pieces arrived for MY
• H2 electronics building arrived (both halves)
• PSL enclosure construction ongoing
• Survey work at HAM7 and HAM8
• H2adcumy went out of sync again and had to powercycle it to bring it back up

I will be restarting apache to enable a minor configuration change.  I will do this at 10:30am Pacific on Saturday 7 May 2011.  The aLOG will be unavailable for seconds during that time period.  As always it is a good idea to save any pending entries to draft format before then.

There were three pressure spikes in the y-arm beam tube last week, on 4/28, 4/29, and 5/1. It's hard to tell if the pressure is coming back down, but it is currently about twice as high as it was 2 weeks ago. Kyle is aware of this - there is a small leak, and the spikes are due to the ion pump voltages increasing to pump out the leak.

We tuned the HEPI pump controller that will regulate the pump speed such that the pressure drop between the chamber inlet manifold and the chamber outlet manifold stays constant. Since there is no chamber hooked up, we controlled the pressure at sensor 4 (after 3 accumulators) on the manifold.
We identified the pump dynamic using a step response. Next, we approximated the pump with a simple model. Then, we tweaked the parameters of the controller using the model. Finally, we measured the closed loop response.
In attachment, you will find:
-	Amplitude spectral density of pressure at sensor 1 (after 1 accumulator) and sensor 4 (after 3 accumulators) for different revolution speeds of the pump.
-	Times series (Step response: Simulations vs measurements)
-	Bode plot (Pump, Open Loop, Closed Loop …). UUG=4.5mHz – Phase margin 60 deg. 

BSC 7 had a horizontal actuator put in place to test the addition of a spacer on the foot as well as a modified bracket (as seen in the attached pictures).

BSC 4 has had the support brackets attached. The SE corner is having an alignment issue between the cross-beam and the pier causing the support bracket to not mate up. Hopefully tomorrow reveals why.

- Apollo/GregG craning by BSC4/Biergarten.  Kyle soft-closes GV7.
- (09:23) Bob Rhodes Cleaning and Air arrives for PSL HVAC work
- Hugh working at MY (see Hugh's log entry)
- Kyle/Apollo at MX
- Terry Spooner visits for Hugh
- DaniA gives Sheon Chua the LVEA walk-through
- IOT1 and ISCT4 access systems giving strange alarms
- Instrument Air at MX acting up today.  Kyle and Ski working on it.  Compressor was broken. (see Ski's log entry)
- Hot deck for Air Handler 3 was warmer than usual, so Ski set it to run cooler
- DaveB and JimB out to LVEA to claim unused workstations
- (13:08) Norco arrives for meeting with MarkH
- (13:57) - Diamond Freight arrives...Hugh checked the shipment.
- Gerardo at MX - removing optical lever
Weather: Winds ~20mph, Temperature ~70F
NOTICE: All craning in the LVEA now requires KyleR and JohnW's prior approval, because gate valves to beam tube are open.

Dust Reports Attached.

Started X mid chiller and CW set point is 50 F.
Number 1 air compressor requires replacement, so there may be intermittent alarms on Instrument air.
Air compressor turned off for now.

Re Log 780
Yesterday Jim and I got half of the hardware in place.
This morning Mick and I did the north Support Tube.
We changed out a washer on the Long to short bar connection and added a second Hose band around for more security.

All set for transport.

JimB, MarkB, RobertL, Anamaria

Yesterday we managed to get the SUS test stand named bscteststand2 working with RCG 2.0. We copied a bunch of things from the current working LLO test stand which of course resulted in a few hours of black magic mostly from Jim to essentially find all the X2s and get them to be X1s. Took us a while to get the daqd and awgtpman working again even if the models were compiling pretty early. Apparently there was also an older test stand running in parallel, and that had to be modified to not run contradicting processes... 

The iop model is: x1ioptstsus1 (in userapps/CDS directory)
The qual model is: x1susquad

We copied and modified the LLO medms JeffK had made for this. We still have some work to do on scripts and medms, but at least we have the capability of reading channels and doing stuff with them. As trivial as it may seem... 

Jim, Hugh

We installed two of the four fixtures Jim designed on BSC6.  The parts are shown in the first .jpg below.  The second image shows Jim doing the in-situ assembly.  The large disc plate fits over the Support Tube end and rests on the broad face of the Expansion Bellows outside the bolt circle. The last images show detail of the remaining.  The long bar bolts into the round plate and the small block bolts to the slots at the other end of the long bar.  This short bar catches the back side of the Chamber Flange, actually sitting on the bolts.  The long hose clamp holds the bar inward preventing it from slipping off the back side.  By having this assembly on each end of the Support Tube, it is prevented from shifting longitudinally although we don't really expect it to want to do this.  The original Bellows Shield remains in place and the large diameter disk and the long bars provide some additional protection during transport.

We'll finish the other side tomorrow.  Thanks to Zac for the parts clean up.

We measured the launch angle and the height of the stage 0 blade posts. The measurements are in good agreement with specifications. An error of 0.02° on the launch angle can be compensated by adding or removing 7 pounds per corner.