The LVEA and OSB chilled water pump was inadvertantly tripped off while attempting some adjustments. The Chiller and water pump were off from about 11:26 local time to 11:35.

The system appears to be back to normal and we have switched to Chiller 3 rather than Chiller 1. Water flow is up from 45hz to 60hz (variable speed pump) We have increased the water flow to help deal with

the summer temperatures.

(corey, greg, jim, mitch) [Work from Thursday]

:::  LHO Sauna, aka Hot Yoga Studio, aka Staging Building :::

Cleanroom Weather:  A balmy 80degF ... (with a 95degF Cleanroom-suit-Factor) ... [& 100degF garbed-Corey-Factor]

Today, we quickly and efficiently moved a BSC Stage-0 Bottom Pate into the Staging Building and placed it on the granite table for prep work.  This marks our return to BSC-ISI assembly work after many month hiatus.

(corey, mitch)   [this is work for Thursday]

Yesterday, we continued with installation/dressing of cables for SEI/ISC/SUS.  Mitch completed installation of the non-SEI cables.  I pinned out some Actuator cables for installation (installed one of them on H1 & still need to install the H2).  I installed the GS13 Grounding Cable Bracket for Corner2. 

As for Corner3....ah, Corner3. 

Ideally, it would have been preferred to have installed the Cable Bracket and dressed the SEI cables before insertion of the HAM-ISI in the chamber, but we didn't have the Bracket parts, so we are installing after the fact.  Corner-3 is basically entirely in the center of the Chamber.  Access to it was not a problem in HAM2 (since one could climb into the chamber and work on your belly as you dressed cables & installed the bracket.   But for HAM3, there is the Septum on the north of the chamber, and so this preferred space isn't useful (I tried, but I would need to shrink a factor of 4 to be useful here).

Another option was to lay on the table and then hang of the side--UPSIDE DOWN! (my Picasso-esque yoga pose [where gravitational force points down] is attached, yes that's my head at the bottom...I was resting on my left shoulder.  And could only stay like this for a couple of minutes until it felt like my head was going to explode). 

Since we needed to cleanly dress the GS13 cables from Stage1-to-Stage-0, I unclamped cables on the breadboard here to have a clean slate, and would like to now start dressing cables and then install the GS13 Grounding Cable Bracket (easier said than done).  Will try the upsided down technique, or we will see if Jim can somehow squeeze in from the side.

Note For Future:  

• Dress & install these cables/Cable Brackets BEFORE installation
• Or, hire elves

(unknown author using Matt's alog account)

This is a (sort of) follow-up of https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3508.

In the attached, you'll see the calibrated spectrum of this morning (red), last evening at about 9PM (blue), last evening at about 4PM (green, the same one as what Matt posted), and some old reference (brown).

There are several things to note:

1. New 0.7Hz-ish sharp line

In the newer two traces, there's a 0.695Hz line which is new to me.

There should be no difference between green and blue except environment noise as far as I can tell.

2. Low frequency

Red, blue and green are all worse than brown at f<0.1Hz. Somebody needs to do on/off test to identify what's offending.

3. High frequency

High frequency noise at f>5Hz apparently changes with time.

4. Vincent's thing is definitely good for 0.2Hz

35W beam

After Matt was gone, alignment degraded over 3 hours or so and ETMY output of slow servo for offloading VCO was getting large (lock filter output of the ETMY was more than 200000 counts).

Since IOP watchdog was alarming, I unlocked the cavity, reset the ETMY LOCK filter and relocked.

My guess is that the servo is running fine and it's just that the cavity length drift is big due to tidal or whatever. Regardless, I reduced the gain by a factor of 2 (H2:SUS-ETMY_M0_LOCK_L_GAIN=-0.1 instead of -0.2), as I want to provide more window to potential seismic/sus data mining for the night before the IOP watchdog potentially freaks out.

BTW the alignment got back to normal though I didn't realign. The poor alignment was apparently caused by the length drive  with large length to angle drive coupling.

Attached are plots of dust counts > .5 microns in particles per cubic foot.

Times are approximate

9:27 Mitchel, Hugh working on cabling and leveling the ISI table in HAM 3
Betsy running transfer functions on suspension staged outside HAM 2
Michael R. working in PSL enclosure on alignment of the FSS path
10:23 Eric working on HAM3 HEPI housings
10:42 Eric, bump driving over cable?
Hugh, Eric operating crane near HAM 2,3
Mopping in LVEA
Kyle soft closed GV18
Thomas realign the H2 ETMY optical lever beam to the front surface, done at 11:22
11:31 Travis working on suspension staged outside HAM 2, 3
11:45 John to end station to open GV18

11:21 - 11:24, 1:32 - 1:35 Kyle, large displacements of East crane 11:24 - 1:32 small displacements of East crane (connection of Vertex Main Turbo Pump to H1 output MC tube)
1:07 - 1:31 Filiberto pulling SUS PR2-TOP 25DB cable from HAM3 Field Rack to mockfeedthru (MC2/PR2 assembly area)
1:07 - 1:20 Travis working on suspension staged outside HAM 2,3
2:34 - 2:46 Maggie, Daniel at end Y VEA

Jim B. Installation of 8-port switch at H1 PSL enclosure
Vincent Addition of DAQ channels in the HEPI template model
Dave Add new PEM channels to all three H2 PEM systems (LVEA, EY, EY AUX)

Bram, Keita, Matt, Alexa, Alberto

Today we found a way to monitor the ETM from the corner station. We pointed the security camera in the Y VEA to the monitor. Now we don't have to drive to the end station to lock the arm. As this photo shows, the principle can be extended indefinitely.

The lock is now very stable.

Although the metal build Quad 3 that is hanging in the staging building has been checked out and is ready to be put in storage, today I used it to test fit a new ECD magnet replacement block and check wire lengths.  So, currently it's M0 top mass is locked and the BOSEMS on the main chain tablecloth are detached.  We will be doing a couple more retrofits of parts (and possibly another round of testing to vet these retrofits) before we are ready to put it in storage.  STATUS: Q3 IS NOT SUSPENDED AND BOSEMS ARE DETACHED.

EricA & I today installed the Actuators in the HAM2 HEPI Housings.  This paves the way for us to now Float the ISI on the HEPI Springs and set the elevation and level of the Optical Table.  We could do that tomorrow and then be ready for IAS horizontal assessment and alignment correction.

With IAS (Jason) giving us the all good yesterday on Horizontal position, today we checked the elevation and level.  Attached are my notes (some is JimW) recording level survey, dial indicator readings, HEPI Spring turns and load cell readings from the week of work on this chamber.  The last page records today's final level shots.  On average we are 0.1mm low with a level of 0.2mm p-p; pretty sure this will be considered in spec.

So IAS is free to relocate to HAM2--no rush though.

The first round of H1 MC2 transfer functions have been taken and committed to svn under:

/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/MC2/SAGM1/Results

filenames:

2012-07-19_0900_H1SUSMC2_M1*

Kissel will look these over tonight.

I measured the LONG and PIT OLTFs and put in some simple damping loops for in both in ITMY and ETMY.  The L "plant" had very low gain compared with P, probably because of the factor of ~10 radio of the Euler matrices.  To avoid a very high gain in the filter bank, I put a gain of 10 in the L2L SensAlign and another 10 in L2L.  This gave a gain of -5 for L, with penty of gain margin.  I set the P gain to -3, again with lots of gain margin (the plot was made with a gain of -5.)

A few days ago the first 2 plates for LHO's next BSC were brought to the staging building. The first of these (D0900894-v2, s/n 1) was placed on the granite table today, and will be helicoiled over the next couple weeks, in between work on other install tasks. We won't really be able to get back into production of BSC's until at least one of the test stands can be switched back to a BSC configuration, but that is hopefully no more than a week or two out.

Pulled SUS PR2-TOP 25DB cable (CAB_H1:SUS_HAM3-3), from HAM3 Field Rack to HAM3 SUS assembly/testing area. Cable was routed to clean room but NOT connected to the mockfeedthru, since it requires full garb inside the cleanroom.

Andres R, Betsy B, and Jeff B took the transfer function for Phase 1b testing of the HSTS MC1 suspension. This data has been plotted and is ready for review.

The ETM optical lever shows interference fringes when the TM is subject to a large longitudinal drive.  I guess this will go away when the front surface beam is found, but it is something to look for on all the optical levers to be sure that we don't add noise from longitudinal motion.