ITMX Yaw OpLev, COMM Locking again

The ITMX Yaw oplev damping is now working, with feedback to the PUM only. 

I am using a verry similar loop to the one for ETMX, but this time I had to add a low pass at 5 Hz to avoid saturating the DAC at high frequencies.  I am using a gain of 1 and the first three filter modules in ITMX_L2_OLDAMP.  The open loop gain measurement and spectra showing the performance are attached. 

With these three opLev damping (ETMX PIT, YAW and ITMX YAW) loops engaged the cavity lock is stable. 

We need a sign flip in the COMM slow path to lock, this must be because of the sign flip in MC2 on tuesday morning. 

COMM was locking stably for a while.  I tried to make a comparison of the noise with OpLev damping on and off, but the measurement is not verry repeatable, so it was hard to make any conclusions. 

I am going to leave COMM handed off over night, with the three opLev damping loops running, so there should be IR in the arm cavity for part of the night. 

Done with TMSY alignment (Jax, Corey, Keita)

Using the green beam retro reflected by ETMY leaking into IR path, we found that the IR QPD path was off in YAW. I don't understand why/how, nobody touched this path since HIFO days, and this path worked in HIFO.

We fixed the problem by turning the pico mirror in the IR QPD path. Just tweek one mirror, and both of the QPDs were fixed.

Details:

There are many many many ghost beams because the reflectivity of IR HR for green is lower than that of IR AR, so we used foils to block ghost beams. It is easy to see the correct beam on QPDB, but was impossible to see the correct one on QPDA as the IR 50:50 acts as a good AR for green. Therefore, for QPDA, we looked at one specific ghost beam and used Kiwamu's calculation to set the ghost beam position right. At first both of the QPDs were off in the same direction by about the same amount. We twisted the TMS by giving it a bias offset and were able to bring the beam on QPDs to correct position. We removed the bias, tweaked one pico mirror until the beam positions were good. Unfortunately the green thing is so dim we couldn't see anything on the IR QPDs.

ETMX P2P Y2Y

After this morning's adventure with the ETMX UIM driver, and thanks to Richard's help to fix it, I could take UIM to test mass pitch and yaw transfer functions. Drivealign filters were then designed in the same manner as Keita with the measurements from this morning. The last two pdf show the filter design, with the filter in cyan.

They are now installed in the L1 P2P and Y2Y drivealign matrix filterbank with a gain of 1, but need to be tested.

UIM data used for the fitting are under the svn and located in :

/ligo/svncommon/SusSVN/sus/trunk/QUAD/H1/ETMX/SAGL1/Data
2014-03-20_H1SUSETMX_P2PY_WhiteNoise.xml
2014-03-20_H1SUSETMX_Y2PY_WhiteNoise.xml

Since the top mass P2P and Y2Y drivealign filters disappeared, I reinstalled them, and the first two pdfs are showing the design.

OpLev damping on ETMX

Arnaud, Sheila

Today we worked on the OpLev damping more, including making the modification to the etmx and Itmx models needed to route the damping through the drivealign matrix for both PUM and UIM.  These models (h1susetmx and h1susitmx) committed to svn.

The problem with the pitch loop saturating the DAC was the high frequency noise, as Keita suggested.  I added a low pass at 10 Hz, and now the loop runs with the intended gain without saturating the DAC.  The first screen shot attached shows the coil driver outputs with the loop in last night's configuration (dashed lines), and with both PIT and YAW damping loops engaged (solid lines).  (The max is 130000 counts). 

The next plot shows the performance of these loops (blue is both loops on, red is neither on).  We get a factor of 5 improvement at 0.45 Hz in Pitch, and a factor of 10 at 0.13 Hz in Yaw.  The Pitch RMS is reduced by 60%, while Yaw rms is reduced by 50%.  

The Pitch loop gain is half of what I had originally indented, the current set up is shown in the attached screen shot. 

ISCTEY progress report and power budget, with bonus TMS offsets

While Corey and Keita were aligning the TMS, I kept myself busy touching up some of the alignments and clean-up tasks on ISCTEY. The refl path and WFS paths are nominally aligned, and I've observed that without my favorite anthropogenic noise sources in the chamber, the return beam is relatively stable.

I'm working with TMS offsets of PIT 20 urad, YAW 9 urad. Not all that bad.

IR:

I adjusted the polarization on the IR Path from its initial position to something closer to the nominal power given in the ISC End Station manual.

Also, my earlier concerns about the shorted power cable damaging the BBPD appear to be unfounded... that factor of 10 I had to add to the impedance was nicely accounted for by the gain switch on the hardware PD interface, which I had completely forgotten existed.

	power
Laser output	enough*
After attenuation	38.7 mW
IR mon PD	310 uW
BBPD	18.4 mW

*this power meter's filter didn't make it into the storage bag, no chance of measuring this one with the tools I have right now.

Green:

PD4 is aligned to the rejected Faraday beam. At this moment, the polarization coming from the laser in relation to the first Faraday appears to be slightly different from EX; I'm consistently measuring ~1.2% power rejected to EX's 1.9%. I've also adjusted the laser current to increase power to the chamber; I'd had it turned down to 0.97 A in an attempt to find the beatnote, and the polarization of the laser wasn't optimal for getting power into the rejection beam (it was initially about ~0.4% of input power). This may be why I was having such a hard time aligning PD4 earlier, there wasn't much there to find.

Also the REFL_A PD might need 

	power
Laser output	53 mW
After 1st Faraday	49.1 mW
On mon PD	700 uW
After 2nd Faraday	41 mW
At periscope	40 mW
At REFL_A PD	12.87 mW**

** at the PD I'm seeing flashes up to ~5 mW. Unclear if this is an alignment or calibration issue, will be tracking this down tomorrow.

CR Workstation Updates

I took advantage of an unusually quiet control room to apply updates to any available worksations.  Updates have been run on opsws1-6, opsws8-10 (vm), operator0, and vacuum1.  Additionally, opsws1-6, operator0, vacuum1 and alarm0 were moved to the new workstations subnet.

opsws0, opsws7, and operator1 still require the latest os updates.  Of these, opsws0 and operator1 still need to be moved to the workstations subnet.

ETMY HEPI TF scheduled to run about 630pm tonight, untrip SUS & HEPI Please

If the crew leaving EndY could ensure the SUS is damped and the HEPI watchdog is untripped, it would be much appreciated.  ISI is locked and can be as is.  Thanks, Hugh

Ops Summary

LVEA Laser Safe

Hugh – Adding payload to HAM5
Aaron – Pulling cables HAM3, HAM4, & BSC3
Apollo – Drilling in LEVA wall for nitrogen line installation

09:42 Keita & Corey - Working on TMS at End-Y
10:05 Sheila – Restart ITMX model 
10:26 Jim – Shutdown OAF
10:30 Richard – Adding ADC card to OAF
10:43 Hugh & Apollo – Adding Payload to HAM5 – Using Forklift
11:20 Jim - Restart OAF
12:00 Praxair – Delivering nitrogen
12:50 Filiberto – Going to End-Y and End-X to pick up items
12:50 Karen – Cleaning at End-y 
13:20 Patrick – Taking down conlog for backup
14:00 Travis – Working in SUS LVEA cleanroom
14:13 Gerardo – Working in the H2 Laser enclosure
14:33 Craig – Working in the H2-PSL
14:35 Richard – Going to End-X
15:30 Sheila – Restart ETMX model 

WHAM5 ISI Optical Table Payloaded with ~600lb iLIGO Leg Element

This completed the need for forklift action at HAM5 for the time.  The Mass was placed on six 1"x1"x1/16".  Will continue payloading (lighter stuff.)

Scott, Bubba, Hugh

Staging building, 3IFO (unit 2) progress

Jim, Mitchell
The down facing optical table is now parked on the granite table anxiously awaiting Apollo on Monday. The up facing is on the assembly stand also ready for action.

As for unit 2 the small and large horizontal actuators have been installed. Stage 1 doors prepped. Horizontal L4-C's have also been installed. Some of the blade bending fixtures have been added. 

TMSX alingment

I redid the baffle PD alignment,

Baffle PD 1: 208.4P -234.0Y

Baffle PD4: 278.4P -297Y

Alinged 243.4P -265.5Y

Change from saved: +5 PIT +1 Yaw

PR3 (-245 PIT -250.3 Yaw) hasn't changed.

ETMX L1 OSEMs

[Richard Arnaud]

This morning while taking measurements on UIM ETMX, I saw all four L1 osems readback were zeros. Looking at the past data, signal stopped at ~10:51 am PT. Richard and I went to the end station, and saw that the UIM coil driver switch was mysteriously turned off... After turning it back on, sensing and actuating now work again.

Conlog stopped to start full backup

No channel value changes are being recorded for the duration of the backup.

The good news is that the backup took only about 20 minutes. The bad news is that it took a lot longer to restart conlog. At startup, when it tried to add the last shutdown time to the database, it reported errors of the type: 'The total number of locks exceeds the lock table size' and quit. Adding 'innodb_buffer_pool_size=1G' to '/etc/mysql/my.cnf' and then restarting the computer seems to have fixed it, but I'm not sure what other implications this may have. I think I'm going to have to rethink how I record the shutdown times in the database.

H1 ETMX Optical Lever Confusion

Has the analog whitening settings changed on the ETMX optical lever? I've compared a high-frequency spectrum with a measurement I took in February, and there's reported tons more motion above 2 [Hz], when the ISI motion is roughly equivalent if not better at these frequencies (see attached). Looks there's an extra 1:10 analog filter that's not being compensated or something...

Refer to ALOG-10267 for the changes in whitening settings on Feb 21st 2014. This accounts for the two orders of magnitude difference you see above 10 Hz.

order make install's were issued yesterday

Jeff asked for an entry showing the order "make install-modelname" commands were issued yesterday afternoon to see if it has any link to the relocking time of the IMC. Note there is a bug in the file name were the month is actually the hour, this has been fixed.

Mar 18 16:39 install-h1susmc1_2014_39_18_16:39:15

Mar 18 16:40 install-h1susmc1_2014_40_18_16:40:25

Mar 18 17:41 install-h1iopsusb123_2014_41_18_17:41:18

Mar 18 17:41 install-h1iopsusb123_2014_41_18_17:41:34

Mar 18 17:42 install-h1susitmy_2014_42_18_17:42:10

Mar 18 17:42 install-h1susbs_2014_42_18_17:42:45

Mar 18 17:43 install-h1susitmx_2014_43_18_17:43:09

Mar 18 17:45 install-h1susmc3_2014_44_18_17:44:40

Mar 18 17:45 install-h1susprm_2014_45_18_17:45:21

Mar 18 17:45 install-h1suspr3_2014_45_18_17:45:41

Mar 18 17:46 install-h1iopsush2b_2014_46_18_17:46:14

Mar 18 17:46 install-h1susim_2014_46_18_17:46:39

Mar 18 17:47 install-h1susmc2_2014_47_18_17:47:18

Mar 18 17:48 install-h1suspr2_2014_47_18_17:47:52

Mar 18 17:48 install-h1sussr2_2014_48_18_17:48:24

Mar 18 17:49 install-h1sussr3_2014_48_18_17:48:48

Mar 18 17:49 install-h1sussrm_2014_49_18_17:49:10

Mar 18 17:49 install-h1susomc_2014_49_18_17:49:30

Mar 18 17:51 install-h1iopsusauxb123_2014_51_18_17:51:13

Mar 18 17:51 install-h1susauxb123_2014_51_18_17:51:37

Mar 18 17:54 install-h1susauxh2_2014_54_18_17:54:05

Mar 18 17:54 install-h1iopsusauxh34_2014_54_18_17:54:54

Mar 18 17:55 install-h1iopsusauxh56_2014_55_18_17:55:40

Mar 18 17:56 install-h1susauxh56_2014_56_18_17:56:07

Mar 18 17:56 install-h1iopseib1_2014_56_18_17:56:43

Mar 18 17:57 install-h1iopseib2_2014_57_18_17:57:06

Mar 18 17:57 install-h1iopseib3_2014_57_18_17:57:33

Mar 18 17:58 install-h1hpiitmx_2014_58_18_17:58:17

Mar 18 17:59 install-h1iopseih16_2014_58_18_17:58:59

Mar 18 18:00 install-h1hpiham6_2014_00_18_18:00:18

Mar 18 18:00 install-h1isiham6_2014_00_18_18:00:36

Mar 18 18:01 install-h1hpiham3_2014_01_18_18:01:21

Mar 18 18:02 install-h1isiham2_2014_01_18_18:01:47

Mar 18 18:02 install-h1isiham3_2014_02_18_18:02:15

Mar 18 18:02 install-h1iopseih45_2014_02_18_18:02:51

Mar 18 18:03 install-h1hpiham4_2014_03_18_18:03:14

Mar 18 18:03 install-h1hpiham5_2014_03_18_18:03:33

Mar 18 18:04 install-h1isiham5_2014_04_18_18:04:13

Mar 18 18:04 install-h1ioppemmy_2014_04_18_18:04:43

Mar 18 18:05 install-h1pemmy_2014_05_18_18:05:52

Mar 18 18:06 install-h1ioppsl0_2014_06_18_18:06:18

Mar 18 18:07 install-h1pslfss_2014_06_18_18:06:53

Mar 18 18:07 install-h1pslpmc_2014_07_18_18:07:15

Mar 18 18:07 install-h1psldbb_2014_07_18_18:07:37

Mar 18 18:08 install-h1iopoaf0_2014_08_18_18:08:12

Mar 18 18:08 install-h1peml0_2014_08_18_18:08:37

Mar 18 18:09 install-h1tcscs_2014_09_18_18:09:02

Mar 18 18:09 install-h1odcmaster_2014_09_18_18:09:26

Mar 18 18:10 install-h1omc_2014_09_18_18:09:57

Mar 18 18:10 install-h1iopasc0_2014_10_18_18:10:25

Mar 18 18:10 install-h1amcimc_2014_10_18_18:10:59

Mar 18 18:11 install-h1sushtts_2014_11_18_18:11:30

Mar 18 18:15 install-h1ioppemmx_2014_15_18_18:15:36

Mar 18 18:16 install-h1pemmx_2014_15_18_18:15:54

Mar 18 18:16 install-h1iopsusey_2014_16_18_18:16:22

Mar 18 18:16 install-h1iopsusex_2014_16_18_18:16:38

Mar 18 18:17 install-h1susex_2014_17_18_18:17:06

Mar 18 18:17 install-h1susetmx_2014_17_18_18:17:23

Mar 18 18:17 install-h1susetmx_2014_17_18_18:17:32

Mar 18 18:19 install-h1susetmx_2014_19_18_18:19:17

Mar 18 18:21 install-h1iopseiey_2014_21_18_18:21:27

Mar 18 18:22 install-h1hpietmy_2014_22_18_18:22:18

Mar 18 18:23 install-h1isietmy_2014_22_18_18:22:44

Mar 18 18:23 install-h1isietmx_2014_23_18_18:23:13

Mar 18 18:23 install-h1iopiscey_2014_23_18_18:23:46

Mar 18 18:24 install-h1pemey_2014_24_18_18:24:14

Mar 18 18:24 install-h1iscex_2014_24_18_18:24:52

Mar 18 18:25 install-h1odcy_2014_25_18_18:25:11

Mar 18 18:25 install-h1odcx_2014_25_18_18:25:26

Mar 18 18:25 install-h1iopsusauxey_2014_25_18_18:25:55

Mar 18 18:26 install-h1iopsusauxex_2014_26_18_18:26:05

Mar 18 18:27 install-h1susauxex_2014_26_18_18:26:59

Mar 18 18:28 install-h1susetmx_2014_28_18_18:28:17

I had a look at the IMC ODC summary around the times stated above and the ODC reports the IMC is green for the following times (in PDT):

16:30:39 - 16:31:40
17:50:31 - 17:50:32
17:50:36 - 17:50:38 
17:51:00+ 

I've also attached a plot showing the IMC ODC over a 3 hour time period which includes the times of interest (plot starts at 16:30 PDT) 

Installation of Trillium T240 Seismometer - Ex

Installed Trillium Interface Chassis S1101837 in Rack SEI-C1 (slot U18).
Trillium was placed close to southwest side of BSC9.
Outputs from Trillium were connected to AA Chassis U30, CH21-26 (Port 5).
Trillium may need to be zero-ed.

Filiberto Clara

The serial number of this T240 is 000531.

Also, for information about calibration and cabling layout, checkout LHO aLOG 10635.