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.

Since the suspension had been moved from the staging building test stand to the LVEA test stand (which utilized production electronics), I rechecked and tweeked the OLV offsets and the gains.  Today's measured OLVs and their channels are listed below:

27693  H1:SUS-MC2_M1_OSEMINF_T1_OUTMON (was -13851, set to -13846)

gain was 1.083, set to 1.083

22937  H1:SUS-MC2_M1_OSEMINF_T2_OUTMON (was -11462, set to -11468)

gain was 1.309, set to 1.308

28101  H1:SUS-MC2_M1_OSEMINF_T3_OUTMON (was -14049, set to -14050)

gain was 1.068, set to 1.068

26782  H1:SUS-MC2_M1_OSEMINF_LF_OUTMON (was -13383, set to -13391)

gain was 1.121, set to 1.120

27729  H1:SUS-MC2_M1_OSEMINF_RT_OUTMON (was -13847, set to -13864)

gain was 1.083, set to 1.082

30198  H1:SUS-MC2_M1_OSEMINF_SD_OUTMON (was -15085, set to -15099)

gain was 0.994, set to 0.993

24246  H1:SUS-MC2_M2_OSEMINF_UL_INMON (was -12413, set to -12123)

gain was 1.208, set to 1.237

23231 H1:SUS-MC2_M2_OSEMINF_LL_INMON (was -12030, set to -11615)

gain was 1.247, set to 1.291

23466 H1:SUS-MC2_M2_OSEMINF_UR_INMON (was -12152, set to -11733)

gain was 1.234, set to 1.278

25039 H1:SUS-MC2_M2_OSEMINF_UL_INMON (was -12977, set to -12519)

gain was 1.156, set to 1.198

24397  H1:SUS-MC2_M3_OSEMINF_UL_INMON (was -12411, set to -12198)

gain was 1.209, set to 1.230

23153 H1:SUS-MC2_M3_OSEMINF_LL_INMON (was -11815, set to -11576)

gain was 1.270, set to 1.296

25610 H1:SUS-MC2_M3_OSEMINF_UR_INMON (was -13089, set to -12805)

gain was 1.146, set to 1.171

19328  H1:SUS-MC2_M3_OSEMINF_UL_INMON (was -9727, set to -9664)

gain was 1.542, set to 1.552

Turned on Hepa fan on table at approximately 0930  while accessing the table for pictures of feed through s returned at 1205 to turn off fan while John W opened the gate valve.  The fan is now off.

H1 and H2 DAQ.

all four frame writers (h[1,2]fw[0,1]) are showing instability. I have extended their raw minute trend update periods to 30 minutes. The new configuration will be applied if any of them restart due to the original problem.

This morning Thomas told me that ETMY OPLEV MEDM screen was not working.

Though the medm screen for new OPLEV channels are present (H2SUSETMY_ETMY_L3_OPLEVWIT_P and Y, what's this stupid ETMY_ETMY thing anyway?), and though the output of the QPD segmens looked OK, the INMONs of OPLEVWIT_P and Y were zero, and more outrageously, the outputs were 1E20 though the gains were 1 and there was no filters. As soon as we set the gain to anything except 1.0, the output becomes zero. Some serious stupidity was going on.

We found that the signs of the oplev segments were all wrong, but that didn't fix this 1E20 thing.

On a deeper inspection we've found that OPLEV does all calculation  in a C code /opt/rtcds/userapps/release/aos/common/src/OPLEV.c, and in this code PIT and YAW are calculated by

pitch = (UL + UR - LR - LL)/(sum*linearResponse*leverArm);
 yaw   = (UR + LR - UL - LL)/(sum*linearResponse*leverArm);

linnear Response and leverArm are EPICS channels H2:SUS-ETMY_L3_OPLEVINF_LINRESP and H2:SUS-ETMY_L3_OPLEVINF_LEVERARM. These used to be 1, but in yesterday's terrible burt restore these were set to zero,  therefore both pitch and yaw were calculated as NaN or something, and depending on what number you multiply that would be displayed as 0 or 1e20, or something like that.

I set these two parameters to 1 and the OPLEV error signal started working.

See the attached.

Watchdog is supposed to watch SUM, PIT and YAW of the optical lever, but as of now OPLEV laser power is connected to the YAW input of the watchdog. Please fix it.

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.