A make install has been performed for h1sustmsy, h1iopsusauxh2, h1ascimc, and h1sustmsx to restore medm directories in /opt/rtcds/lho/h1/medm.  These were not restored on Tuesday but should have been. They are not new missing directories.  I verified this against the build log and the list of missing files to see they had not been restored with the other missing files.

Laser Status:
Output Power : 28.3w
FRONTEND WATCH is green
HPO WATCH is red

PMC: 
Locked for : 1d 18h 16m
Reflected power : 1.2w
Power Sum : 11.3w

FSS: 
Locked for : 0d 0h 55m

ISS:
Diffracted power : 13.105%
Last Saturation Event : 1d 18h 30m

WP 4517

The h1oaf0 computer was shut down to allow addition of a 5th ADC card for use by h1peml0.  

The h1iopoaf0 model was modified to add ADC4.  Card assignments to the models will be ADC0, ADC1, ADC4 to be used for h1peml0, and ADC2, ADC3 will be used for h1tcscs.  This allows the same ADC card assignments to be used at LHO and LLO for the tcscs model.  

A burtrb was done on h1tcscs before shutdown, it can be found in target/h1tcscs/h1tcscsepics/burt/h1tcscs_burt_140320_100830.snap

The h1peml0 model was modified to move ADC2 to card_num=4.

07:30 to 08:15 Apollo craned the two HAM5 Doors in the LVEA

~0900 -> Increased from ~5 psi to ~15 psi -> no change in slope of Y1 accumulation  

~1045 -> Increased from ~15 psi to ~25 psi -> no change in slope of Y1 accumulation (historically GV6 won't "cam over" or hard-close until much higher closing pressures are applied.  We would like to ensure that its gate is fully contacting its O-rings so as to eliminate hydrogen pumping from the adjacent vacuum volume for a, at least, a portion of our Y1 accumulation data collecting)

(Corey, Jax, Keita)

GREEN Beam Alignment & Power Measurements

Continued with alignment work from yesterday.  So, yesterday we had the green beam coming form the table into the chamber, centered on the QPDS, retroreflecting off the ETM, and heading back toward the table, but hitting the bottom periscope mirror under the TMS table.  So, first thing we did was pitch the TMS "up" (slid pitch masses back).  We adjusted a few BOSEMs after this pitch move.  Once we had pitch good, we roughly made it back out of the chamber through the viewport...but to do this we had to steer the TMS in yaw.  So we were off a little in yaw, but able to get back outside on the table with yaw bias.  But because we didn't want to use up all of our range, we were going to have to PUSH the entire TMS Assembly...we broke for lunch at this point to find out where the tools were.

Oh, should mention that we measured the green power as it (1) enters the TMS, and then the (2) reflected & (3) transmitted light of the BS which sends light to the Green QPD Sled....unfortunately, I wrote these values on the cds laptop.  So will post powers later.

Push In Yaw (& more Pitch) & Dropped Bolt

Set up to yaw the entire assembly counterclockwise (as seen from above the BSC chamber)...or basically a Right Handed Turn.  Now, the real estate is pretty tight upstairs.  while trying to install a teflon-tipped dog clamp on the rear-end of the TMS, I dropped a 3/8" bolt.  Luckily it didn't hit anything on the TMS, but I believe it went down underneath the temporary flooring.  Continue with setting up the pushers.  Once we were ready, we had the green beam & a damped TMS.  I then pushed the assy in yaw while Keita watched the beam.  This worked out well, and we fixed yaw.  I believed another BOSEM adjustment was made here...perhaps we did another pitch adjustment here (we did a few of them through the day).

BS for Hartman Path Missing

Realized we were missing an optic on the in-air table (BS to pick off for the Hartman path).  Aiden says this optic is on its way.   Anyway, we'll have to install that later (it'll change alignment, but we'll use irises to maintain alignment).

IR Path Work Begins:  Pointing Out IR Viewport & Beam Diverter Work

The green beam is also used to align the IR path.  We steered out this beam by steering the "entry" mirror for the IR path on the TMS table.  After this was done, Keita looked at the path for the Beam Diverter and steered the beam to the High Power Beam Dump.

Next:  IR Path to QPDs

Tomorrow, we'll continue with IR path (via green beam), and get the beam onto the IR QPD sled ("this is the trickiest job" says Keita....he says if it goes well, we might be able to finish this job Thurs, but it may carry over to Fri.  We shall see.)

When we aligned TMSY to the ETMY such that the green beam retro-reflects from the ETMY, we needed to put about 400urad YAW offset in TMS suspension bias.

TMSY slider can take 600urad so there's still 200urad head room, but that's too thin a margin as it could be easily eaten by yet unknown ETMY YAW offset.

We used pusher setup to move the TMSY cage as we watched the beam motion. Fixing the dog clamps and removing the pusher moved the TMS back a bit, but we ended up with a perfect alignment with 40urad YAW offset, which is really good. We also adjusted the PIT balance by moving big slide masses under the TMS ISC table, and a small screw used as a weight on the TMS ISC table.

We aligned the IR transmission path that goes to ISCTEY by using the green beam leaking into IR path. We also adjusted the high power beam dump path. During this procedure we found that moving steering mirrors change the balance, and adjusted the slide masses again.

We will look at the IR QPD path tomorrow.

Jeff, Arnaud, Sheila

This afternoon the arm cavity was staying locked for minutes at a time, not really long enough to make a useful progress on WFS. 

We decided to work on OpLev damping, in the hopes that we would be able to stay locked longer with OpLevs.

First we noticed that in the locally modified quad models for ETMX and ITMX, the OpLev damping signal was summed into the drive to the PUM after the drive align matrix, meaning that we would not be able to take advantage of all Keita and Arnaud's work of diagonalizing the PUM drive.   So we made a change to the front end model to sum the oplev damping signals in before drivealign, but after the lock out switch.   For the record this means that there can be a signal going to the osems even when the lock outout switch is off.  Screenshot attached of the new version of the model, which is committed to the svn.  This hasn't yet been done for L1 or ITMX, but we will want to do it if we are going to use OpLev damping permanently.

Based on Keita's measurement in alog 10747 we designed a controller to have a lower ugf of 0.1Hz and an upper ugf of 2.5Hz, with a pole at 10 Hz, which is now loaded in FM4 of H1SUS-ETMX_L2_OLDAMP_P.  This immediately saturated the DAC, and we had to turn the gain down to -0.1 to prevent constant saturation.  The current loop gain is attached, with gain from 0.4-0.65 Hz and gain margins around 40 degrees.  If we want to use more gain, we will need to drive the UIM which means we will need to diagonalize it. 

Since we are planning to use PUM for WFS as well, we will probably run into the same saturation problem with WFS, another reason to diagonalize the UIM.

We measured the RMS three times, before we started with no damping off (green) 85.5nrad then with damping on (magenta) 29.5nrad, and again with damping off (red) 48.2nrad. Because the ground motion was changing as we made he measurements, it is not totaly clear from the spetra that the loop is helping.  The ratio between the ISI tilt (RY) and the OpLev spectrum at 0.43 Hz is decreases by ~5dB as we would expect from the loop gain.

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...

Aidan, Thomas, Dave H.

We spent most of today hooking up cables in the mechanical room. Both chillers now have DAC control (although the output channels are still to be configured). We installed most of the TCS cables in the CER too. A few of the long cables (cables X&Y: 46 and 47) are in back to front: we need to pull them out and install them flipped around (we're not going to use gender changers as we'd need too many of them).

Status is current in the attached PDF.

1500 hrs -> Hard-closed GV10 

1700 hrs -> Adjusted instrument air at GV6's piston from <5 psi indicated to 5 psi -> GV6 is likely not in full contact with its gate O-rings -> may adjust air for full contact tomorrow 

The hardware watchdog unit has been installed in the DAQ test stand for testing.  All electronics associated with this unit are powered up, wiring has been restored to it's previous configuration for testing.

Right now the SUS and HEPI are untripped but if they don't survive the exit of the Chamber by the ISC crew, could someone untrip the SUS and HEPI?  Thanks much--H

160 channels added and 4 removed for a current total of 122,626.

(Alexa, Sheila, Kiwamu) -- a post from yesterday that didn't get uploaded due to alog maintenance

I repeated the IMC intensity noise measurement that was done for HIFOY (alog 7364):

Step 1: Measure the power spectrum of MC RIN via H1:PSL-ISS_PDA/B_CALI_DC_OUT with both the ISS off (REF 7) and on (REF 11) (see 20140318_MCRIN_Data png for these measurements).

Step 2: Calibrate via the following:

IMC_trans_freq_noise = f0/L*PWR*(2+1+1)/c/mMC2/(2*pi*f)^2 * RIN

where
f0=2.818e14 Hz    (red frequency)
L=16.4736 m       (IMC length, one way)
PWR=1.36e3 Watt   (Power in the IMC, = 8290 mWatt * Finesse/pi, Finesse=516)
mMC2=2.9kg        (Mass of MC2 mirror, same as for MC1 and MC2)
(2+1+1)           (effect of MC2 at 0deg, MC1 at 45deg, MC3 at 45deg)
f                 (Audio frequency)

This calibration is set up in matlab file: calib.m (and returns the HZ txt file). We only use PDB_DC_CALIB since this measurement gives the out of loop sensor noise (meanwhile PDA gives the in-loop). See screenshot for result.

Note: In order to ensure a proper calibration of these channels with the increased power into the MC, I adjusted H1:PSL-ISS_PDA/B_CALI_DC_GAIN such that the tsdavg was 1. PSL TEAM: does this change the gain of the loop?? Feel free to return to the nominal values. The ISS and MC still lock under the new configuration.

(all these files can be found in: /ligo/home/alexan.staley/Public/IMC_IntensityNoise/... I was not able to upload them because the files were too large)

The next step will be to insert this result into the model...TBD