(Alexa, Kiwamu)

I have attached the following graphs:

1) The most recent noise budget produced by the ALS HIFOY model

2) Plot of all the contributing sensor noise to the IR noise before applying the CARM control  (which is why we do not see a knee at high frequency when comparing to the noise budget graph)

3) Infrared Noise assuming:

S_IR  = S_sensornoise                                      for f < UGF of CARM feedback

S_IR = UGF/f * S_sensornoise                          for f>UGF of CARM feedback

Thus, we are assuming a 1/f behavior above the UGF, which should overestimate the RMS. This graph includes the current acoustic noise and that with the acoustic noise lowered by a factor of 10 predicted by Robert for the science run.

4) Plot of RMS vs UGF of CARM feedback. This graph indicates if the acousitc noise is lowered by a factor of 10 the UGF of the CARM feedback can be increased while reaminig under the noise limit of 8Hz.

Starting a new round of transfer functions on ETMX over the week end. GPS starting time = 1060127914

Kyle 

Had valved-out inst. air to LLCV this morning while manually filling CP1 -> Hand over to PID control re-exposed known quirk with CP1's pneumatic actuator control box, that being a gas-column oscillation -> I adjusted (cw) the damping jet until the oscillations stopped -> Control behavior may be different as a result 

I will monitor from home

Work at LVEA – Richard

375 ml of distilled water added to the crystal chiller – Justin

Testing ITMx ( Spectra Test ) - Arnaud

We had tried some whack the Crossbeam repairs but this did not improve the response so we've exchanged:

                 C2      C4
Pulled  L41343  L41439
Install  L41451  L41333

from BSC1.

After the alignment of the ETMX, a quick spectra has been ran, to check for rubbing.

The attached pdf shows a comparison between monday's (2013-08-05, in blue) and today's (2013-08-09, in green) undamped spectra, for the main and reaction chain top mass 6 degrees of fredom. Main resonnances haven't moved since then, and thus, the quad looks to be freely suspended, without any major rubbing. 

Last nights transfer functions didn't succeed, because of a bug in the automated script. It has been fixed, and the tf will be reran over the week end.

A short list of updates for the vacuum workstations:

- I have corrected the issue with some paths embedded in the local VE MEDM files that prevented some displays from working when /ligo was not mounted.  All local MEDM files should now not depend on any servers being mounted.

- DNS servers were modified to point to ns0 and ns1, which did not exist when the workstations were installed.

- I have removed hanford2 from the fstab.  It's filesystem is now sufficiently trashed enough to not be useful.  /ligo is still mounted read-only, to allow the use of Data Viewer.

- The latest OS updates were applied, and the workstations rebooted.


In addition, the control room Centos vacuum workstation has been upgraded to look like the rest of the workstations installed in the outbuildings, since the Centos box depends heavily on hanford2 and was thus not very useful anymore either.

Jamie, Hugo,

Tested the following HAM-ISI transition scripts, under the guardian interpreter:
READY      -> DAMPED
DAMPED   -> ISOLATED
ISOLATED -> DAMPED
DAMPED   -> READY

Minor adjustments appart, It was a very straightforward process, thanks to Sebastian and Charles help. 
 

HAM-ISI transition script are ready, and work under Jamie's new Guardian Interpreter 

Next steps for SEI guardian:

• merge safe.snap & alarm text files into guardsnap files (today)
• finish up recovery scripts & get them called at transition script failures (and not only when EPICS alarms are triggered)

The VME crate for the LVEA Y arm vacuum controls failed last night.  From initial investigation it looks like the power supply died.  I have swapped out the crate with a different one and re-installed all of the cards and cables.  Cyrus assisted in getting it back up and running. See his report.

I don't see any apparent way to attach the ISC cables through the top mass. 

There are four DB25 cables for ISC electrical components on the table/tele (i.e. picomotors, beam diverter, and QPDs). These are first attached to the top mass and then to the ISI table. Right now this is supposed to be done by using a standard PEEK clamp inside the top mass.

See the attached pictures, and a helpful cut-out  view drawing of the top mass from D0902163.

 In the pictures, you're looking down in a rectangular opening (or a "hole") in the top mass, and deep inside that hole there is a standard PEEK clamps tightened by thin hex head bolt. Now, we are supposed to somehow thread four DB25 cables through this hole, and then through these cable clamps, squeeze the clamps, and tighten them. The clamps are 3 inches or more down inside the hole, and you cannot access them unless you have 1/4" thick and maybe 5 inches long fingers. I even don't know if there's enough space to physically allow us to thread the DB25 heads through the top mass hole, let alone through the cable clamps. 

The only apparent possibility is to disassemble the top half of the top mass to expose the clamps, remove the clamps, thread the cables with bulky DB25 heads between the blades through the bottom half of the mass (I don't know if this is possible but let's assume it is), put the clamps on, then assemble the top half again, in-situ , and rebalance everything. That's not a real solution.

I, Corey and Stefan searched for a threaded hole or two on the top mass so we can attach some hold-down cable clamps, but couldn't find any. All threaded holes are already used by something else. And even if there is one, we cannot simply loop the cables around the mass, as now the table cloth encircles the mass completely, unlike the old design.

Someone please give me a procedure to make this work.

FYI, the old way to do this (i.e. at LHO EY): The cables are first fixed to the bottom of the top mass which has a cable clamp (e.g. see this picture of TMSY top mass taken from the bottom), then the cables are looped around the back side of the top mass like this picture, then attached to the top of the top mass which has the same clamp as the bottom, and then from the mass to the ISI table.

It was really clumsy to work with, so the ISC group requested an improvement together with other things, but until today I didn't appreciate that the mass structure was completely redesigned (as opposed to small changes here and there).

Found CP1 level @ 23" WC = 55% full at 0830 -> Determined CP1 LLCV fully closed via removing inst. air and observing no stroke -> Begin manual filling of CP1

The LY vacuum controls have been invisible since last night. I hope someone can correct this.

thanks

TMSX was balanced on the spot without using the balance bridge, and it was just fine.

First the top mass was fixed level using EQ stops, then table/tele was hung, balanced while half-supported by Genie lift using the movable masses, and I have to say that these are much smoother than the first article. Since the table/tele was measured 79.5kg, we added 2.5kg masses (3x500g, 5x200g).

Next the top mass EQ stops were all backed off, the table cloth was moved around a bit to allow the top mass to float freely, and of course we had to use the top slide masses to balance it.

As was observed at LLO, there were two spots where the clearance between the mass and the table cloth is uncomfortably small (less than a millimeter): One is the back right corner and the other is the front right EQ stop. Table cloth was moved to provide maximum clearance (but it is surrounding the mass so it's a zero sum thing).

Anyway, the suspension is hanging freely, the only thing is that the side BOSEM is almost touching, and that's why Caltech people sent us a modified BOSEM mounting plate, which I gave to LHO C/B today.

We haven't measured the height of the TMS, and we need a help from either AOS or SUS to measure this using optical level.

Travis, Jason, Betsy

Over the last 4 days, we have worked to tune all 12 DOFs (6 each lowest mass on 2 chains) to within the IAS tolerances.  As usual, since all DOFs crosstalk, we took many roundabouts, but finally think we have acheived it.  Jason will append final pointing/position numbers.  TFs taken tonight will exhonorate this "final" pointing.  After TMS joins us on the table (still a few days out) and finishes their IAS alignment, we will finish payloading the QUAD.

Note, the alignment process takes many days because after each adjustment, many mechanical brackets and structural items need to be realigned such that the BOSEMs are in range and we can turn the damping on in order to make another IAS measurement of pointing.  As well, we have to maintain the floating OSEM/magnet pairing alignments on the lower stages which cause the chain to go out of alignment due to their own weight.  Then, IAS makes a measurement, we make the pointing adjustment in the chain, readjust the floating OSEM/magnet pairs (often at the cost of some of the point adjustment we just made), readjust many mechanical brackets, reenable damping everywhere, repeat IAS alignment, cycle around again.