ETMy ESD drive

Just to compare what was posted at LLO yesterday https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=12702.
I ran 128k 3Hz sinewave to each quadrant with -125k bias on the DC and looked at the responses.  The good news is it actually responds.  The bad new it trying to make it respond to sensible signals like a pitch or a yaw does not yield much in a way a results.  I am sure Keita will have more to say.  But attached are our results of a 3Hz injection

H1 HAM45 Optical Levers

Hugh, Thomas

The in-chamber optics are installed but not aligned yet, when the optical lever components on the outside of the chamber and the viewports are installed we will do the alignment portion. 

sitemap fixed; now opens guardmedm screens consistently

Dave and I fixed up the method by which the sitemap is opened today, fixing the problems we've been having with openning guardmedm guardian controls screens.  sitemap is now a script that should be in the path of all users (currently stored at /ligo/apps/linux-x86_64/utils/bin/sitemap).  It works from the command line, and menu bar launchers.  All other references to any other method of openning sitemap should be purged.

All sitemap calls should now also reuse ("-attach" to) the same MEDM session.  If a sitemap is already running, it should raise the already running session.

OFI Installation

Andres R., Gerardo M., and Jeff B. 

   The OFI suspension was installed into HAM5. No problems were encountered during the installation.  

SUS guardian not handling OLDAMP loops; source of large BS oscillations this morning

This morning I restarted the suspension guardian nodes to bring them up to date with the changes Arnaud and I made yesterday (alog 11982).  Almost immediately the BS started oscillating in yaw.  I tracked the issue down to the BS optical lever loops (H1:SUS-BS_M2_OLDAMP_Y in particular).  I believe cycling GRD:SUS_BS through it's graph, which shuts off the damping loops and alignments offsets, is what set it off.  Even after re-enabling the damping and alignment offsets did not fix the issues, as the OPDAMP filters were rung up (the outputs continued to oscillate even after the inputs were shut off).  After shutting off the OLDAMP loops the oscillations damped down, and once I cleared history and re-enabled the OLDAMP loops things came back to normal.

Clearly one problem is that the SUS_BS guardian is not handling the optical lever loop in the BS.  It looks like only BS has OLDAMP engaged at the moment (excetly ITMX, which I'll mention in a minute).  The SUS guardian probably should be making sure the OLDAMP controllers are shut off when the optics are not aligned.  I'll work with the SUS team to get this fixed.

I'm not sure why ITMY has OLDAMP engaged where as the rest of the main suspensions do not.  I'll look into that as well.

SRM 3a lower stages transfer functions completed

Measurements on lower stages (M2-M2 and M3-M3) of SRM succesfully completed yesterday night. The transfer functions are showing a good match with the model (plots pending).

Installation Meeting Minutes

• Janna Levin visiting
• Work Permits
• SRM:  osem adjustments, TFs yesterday, need to review TFs before handing over to OFI
• OFI:  Staged by ham5
• Baffles staged at HAM5
• HAM5 SEI:  Balancing a few days out (to install rest of payload)
• HAM4 SEI:  running TFs, HEPI locked (unlock for measurements later), may install doors if SEI happy
• HAM6:  start QPD Sleds, enter next Wed
• ACB:  swap out spacer
• CPB:  discussing logistics of this work
• ESD investigations continue (comparing with L1) & thinking of plan
• TCS:  table work on Y table and Hartman table continues
• Peter/Oliver in H2 Laser Enclosure

CDS model and DAQ restart report, Tuesday 20th May 2014

model restarts logged for Tue 20/May/2014
2014_05_20 12:14 h1sussr2

The right side of the river

Chris, Kiwamu, Lisa, Stefan

After the 45MHz 12.6dB boost this morning we recommissioned the interferometer:
- We realigned the whole interferometer.
- We added ND0.4 filter on REFLAIR_A to avoid saturation.
- We adjusted gains and phases to match REFLAIR_A_RF45, REFLAIR_B_RF27 and REFLAIR_B_RF135.

- First we tried approaching the fringe from the left side. We were hampered by weird demod phases in RF45, as well as the appearance of a resonance in transmission of the y-arm. This probably is the 20 mode of  the 45MHz.
- We then decided to approach from the right side of the fringe. There REFLAIR_A_RF45 had the same demod phase as PRMI only.
- We acquired 700 red Hz off resonance.
- We decided to use both its I and Q for PRCL and MICH, because they looked cleaner at low frequency.
- We transitioned at 700 red Hz to RF135.
- We needed the following settings:
   REFLAIR_A_RF45  147deg (same for PRMI, and with arms)
   MICH GAIN 1.2 (UGF 6Hz), PRCL GAIN 0.8 (UGF 25Hz)
- Next we started walking in. We needed to update the REFLAIR_B_RF135:
    73deg (PRMI),
    58deg (1kHz offset),
    51deg (and MICH GAIN from 1.2 to 1.0)(450Hz CARM offset)
    42deg (250Hz CARM offset)
    unlocked at 75Hz (up to 1 in ETMY transmission)
- Next attempt identical, but no unlock
    40deg (160Hz CARM offset)
    At 125Hz CARM offset we noticed that only the y-arm was building up, so we fine-tuned the DARM offset until the arms were symmetrical.
    37deg (60Hz CARM offset)
- Then we marched across the river.

Some observations:
 - We had ad least a factor of 10 buildup. We should get more, but we were still moving across the fringe rapidly.
 - We looked at REFLAIR_A_RF9 but it was puzzling: only a large offset in I.
 - We then tried a pure DARM fringe offset, but this made the 3f signals flaky.
 - The 3f signals were fine across the resonance.

y-arm mode scan

Attached is a mode scan of the y-arm cavity (ring heater on). Both the DARM offset and the frequency counter are calibrated in mircons for the y-arm.

- Our ALS-DIFF calibration is a factor of 3 off - I needed about 3 micron per count from H1:ALS-C_DIFF_PLL_CTRL_OUT, which advertises to be calibrated in micron.

- The expected transverse mode spacing for the y-arm is 8.5 kHz (Ritm=2307m Retm=2238.9m, The ITM is also currently being heated weigh the ring heater.).  The mode scan measurement is consistent with 8.5kHz, with an or or of about 500Hz.

- The problem with that is that the 45MHz sideband is 16261Hz  off the resonance, bringing the 20mode nominally to 738Hz .

- We suspect the the first side we tired to approach from (left side on the COMM offset slider) was contaminated by this mode. We're now trying the other side.

CO2P X-laser update

Thomas, Greg, David

HWS 
- X-end of table continued to be aligned.

TCSX -
- managed to get the FLIR camera to be connected up to a laptop. Will look to mount on-table tomorrow.
- measurements made to calibrate the on-table output power meter.  Maximum power of 2.36W for a rotation angle of 82.5degrees. 
- maximum measured power after the two polarizers was 40.85W.
- maximum measured power after the mask was 10.1W 
--> this would indicate that a maximum power of ~5W could be incident on the CP. Will investigate further.
TCSX laser will be left operating overnight.

The low transmission through the central mask is because 
 - that mask was designed for use in the central heating path 
 - the beam size in the annular heating beam path is ~2.5x larger than in the central heating path.

Gate Valve Operation

This morning GV5 and GV7 were soft closed for craning work in the CS VEA. Valves were opened by 12:39 pm.

OPS: reset of HEPI L4C Accumulated WD Counters Tuesday 20nd May 2014

HAM 4

changes to SUS guardian

Arnaud and I have made some changes to the SUS guardian.  We broke up the graph such that the requestable states are now idle states that don't actually change the state of the suspension:

The dark blue states, which are the requestable states, now only check the alignment and watchdog status.  The reason for this change is so that guardian being in e.g. the ALIGNED state actually indicates that suspension is fully aligned.  Previously guardian would enter the ALIGNED state, even before the offsets had fully wrapped to their alignment values.  Other guardian nodes that might be watching the SUS guardians for optic alignment would therefore be misled.  This just makes the state more explict.

I also removed the goto flag from the RESET (was SAFE) state due to a bug I discovered in guardian.  The bug is that if there is a goto on the graph, then the INIT state will not be executed.  This is something I need to fix in guardian.  In the mean time, I just made all the desired transitions explicit.

Oplevs on friday windy night

On friday night, the wind was high(~25mph), and the arm was hard to lock. Although the angular motion of the test masses was not particularly different than on a quiet night. First attachement shows the oplev spectra from friday night, when the wind was ~25mph. second attachement shows spectra from yesterday night with a 5mph wind.

To note :

• RMS of ETMY (blue curve) in pitch and yaw are consistently higher, even though the ISIs are in the same config (level 3 controller and Tbetter blends on St1 and St2 except for Rx and Rz)
• ITMX (pink curve) seems to perform better, but it's actually because the oplev beam is offcentered from the qpd, sitting mostly on S4 quadrant. SUM is ~5900