In order to help investigate / model the recent problems with IMC closed loop TF changes (see LHO aLOGs 5279, 5294, and 5367), I've copied over the foton file for H1SUSMC2 into the userapps repo and committed,
/opt/rtcds/userapps/release/sus/h1/filterfiles/H1SUSMC2.txt

Note, though it's been verbally agreed upon during a few CDS software calls, most of these filter files are *not* hard links to the userapps repo. We should really get this decision in a CDS requirements document, and make sure all sub-systems obey -- because now we're in an awkward state where the chans folder is full of original files, soft links, hard links, and it's not clear at any point if the repository or the chans folders is the right place to go for currently-in-use filter files.

LVEA laser safe all day
Doug C and Jason working on alignment in LVEA
Apollo crew working at EY most of the morning.

0800 - PSL diode chiller water refilled by Michael and Justin
0845 - Carolyn P working at both MX and MY
0915-1115 - Michael R working on FSS in HI PSL
0945 - Hugh working on HAM3 L4C leveling; will coordinate with IMC folks (not currently locked)
1100 - Dale escorting tour group of middle school educators around site, including control room and LVEA. 
1245 - Betsy to LVEA working on BS, Dale photographing
1400 - Vincent taking measurements on BSC6.

During the QPD connection check, I found that the segment #4 of the MC2_TRANS showed a big offset of approximately 4300 counts. According to the 10 min trend, this offset has been there from the beginning (Jan. 16th [1]). I disconnected the signal chain at various points to find out which electronics is causing the offset. It seems that the AA board [1][2] is the one. I disconnected the SCSI (which connects the AA board and ADC) to see if it removes the offset and indeed the offset went to zero with the SCSI off. I will have a close look at the AA board tomorrow and hence may need to pull the chassis out of the rack if necessary. Note that because of this investigation the IMC was intentionaly unlocked from approximately 8PM to 9PM.

[1] LHO alog 5127
[2] D0902783
[3] S1102790

Travis, Betsy, Jason, Doug

After the jinxing at the morning meeting regarding how easy the Beamsplitter alignment was going, we proceeded to walk the pitch and yaw DOFs all over the place for most of the day.  LIGO Lesson #239: Never assume that things are going well.  Lesson #240: Never announce that things are going well in a meeting.

Yesterday, we had the pitch and yaw alignment close albiet at the ends of adjustment ranges in both DOFs.  We had a bit of a differential pitch between the top mass and the optic which meant we were unable to center the BOSEMs once pitch and yaw had been aligned.  So, after chasing tails a bit, we bit (!) the bullet and used the pushers to adjust the yaw, while keeping the BOSEMs all in range.

We left with yaw and pitch back to being close, but need to finish OSEM alignment in the morning.  Then, on to a quick TF set, followed by baffle alignment, as was the plan today.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Feb. 3 to 5 PM Feb 4. Also attached are plots of the modes to show when they were running/acquiring data. Michael R. swapped out the dust monitor in the H1 PSL enclosure (location 10 in the LVEA), but the one I gave him to replace it with has stopped counting.

Data taken from h1nds1.
660 seconds worth of data was unavailable on this server
1440.0 minutes of trend displayed

Dataviewer gave a 'No data output.' message retrieving the data for the counts > .5 microns.

Somehow the hypothesis has been that the peak in the MC OLTF is the structure in FSS and we should be able to mitigate that guy if we retune the FSS notch.

That was attempted today, but the problem is that the peaks the FSS notch is notching out are at about 780 kHz, and MC "peak" we're talking about is a rather broad thing at around 710 kHz. We could move the FSS notch to there, but if we do that the FSS structures are almost totally out of the notch. See attached. Note that the MC OLTF was measured without Evans Notch (TM).

It's clear that the "peak" we're talking about is not the FSS peak per se, it's either a simple gain peaking or something that is not there in FSS. Keeping Evans Notch (TM) sounds fine to me, but if somebody feels the need to put move it out on the option board in the common mode board, please feel free.

Still need to do the NE Corner to close out.  HAM3 HEPI is currently FLOATING.

Michael, Keita, Dick G

We received the 4 port RF combiner today and were able to install it in the H1 electronics room. I measured 17.3 dBm going into the TTFSS LO inside the laser room with no attenuation. The common gain was lowered from 18 to 15 dB to give a UGF at 415 kHz with 55 degrees of phase margin.

We then tried to adjust the notch at 790 kHz but in the process I appeared to have crushed the variable capacitor and had to replace it. While tuning the notch back to 790 kHz with the new capacitor we noticed a peak around 1.6 MHz with a notch just off it at 1.8 MHz. We brought the notch to 1.6 MHz to compensate for this peak using a variable capacitor labeled in the attached picture.

The INI change for the h1isietmy system precipitated a mini-restartfest. We restarted the models on h1seib2, h1susb6 an h1pemey (Dolphin related) and then restarted mx streams on h1susbstst, h1susauxb6 and h1susauxh2 (mx end point related).

Mind the signs--the HEPI is unlocked so the Blue Crossbeams are floating.  Do not step on anything if possible.  I should wrap this up today after which I will relock.

The housings, crossbeams, and clamps have been installed on HAM6. It was a bit of a tight squeeze but with the help of Apollo we managed to get it done. Support tube positioning is almost complete, at which point I'll lock down the springs. One housing clamp needed a small modification, but is working well now.

I have updated the IMC master screen, namely H1IOO-MC.adl, to the laest Livingston one this morning in order to enable links for some QPDs associated with the IMC.

The IOP watchdog of H1SEIB6 was tripped due to a IPC connection error between H1SEB6 and H1SUSB6 (cf attachment). An error rate of 10samples/s (64K model) will be allowed soon.

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Jan. 30 to 5 PM Jan 31. Also attached are plots of the modes to show when they were running/acquiring data. Dust monitor 10 in the H1 PSL enclosure is still indicating a calibration failure.

Data taken from h1nds0.
T0=13-01-31-01-00-00; Length=86400 (s)
9780 seconds worth of data was unavailable on this server
1419.0 minutes of trend displayed

Attached are plots of dust counts > .3 microns and > .5 microns in particles per cubic foot requested from 5 PM Jan. 31 to 5 PM Feb. 1. Also attached are plots of the modes to show when they were running/acquiring data. Dust monitor 10 in the H1 PSL enclosure is still indicating a calibration failure.

Data taken from h1nds0.
T0=13-02-01-01-00-00; Length=86400 (s)
7740 seconds worth of data was unavailable on this server
1427.0 minutes of trend displayed

Design of isolation loops for HAM-ISIs go in 3 steps:
1) - Isolation loops level 1 :UGF=10Hz
2) - Isolation loops level 2: UGF=25Hz
3) - Isolation loops level 3: UGF=35Hz
The higher the step, the more sophisticated the control loops are.

Level 3 Isolation loops were designed, and installed, on HAM3-ISI a couple weeks ago. They were not used then.

The design of Level 3 isolation loops for HAM2-ISI was completed today. These control loops were installed and tested in cunjuction with their counterparts, running on HAM3-ISI:
- The IMC was locked right away (Gain=10dB, boost filter engaged) ~ 1.45pm PCT
- Spectra of the IMC length controls were taken, and compared with results obtained with the level 2 isolation loops (same blen filters used)

Improvements:
- Better performance in the 5Hz-10Hz range
- Better performance in low frequencies, below 200mHz

Notes:
- The IMC is still locked (5.41pm) and I am about to lower its loop gain to 0dB, just to make sure the servo does not damage anything if the IMC loses lock (requested by Giacomo & Cheryl)
- Ground motion is a bit favorable now, but not in the range of improvements, along the X-axis.
- Level 3 isolation loops will be left engaged over the weekend (see attached screenshots for Watchdog Values).

Giacamo/Cheryl worked out at IOT2R for the first part of the day with Laser Hazard (then after their work, we transitioned to Laser Safe).  This cleared up Hugo to do work on HAMISI & Barton to run measurements.

The Y Beam Manifold Spool was installed this morning.

Betsy worked on ITMy & Travis worked at Test Stand

EY BSC10 door was removed

Toppenish Middle School had an 8th Grade tour of the site (~100students)

This morning, I pulled the First Contact from ITMy-HR.  I then swapped in fresh witness plates for the ones I placed under the ITMy yesterday since I already saw particulate on them.  I did a final check over of the chamber and moved out all of my equipment.  The chamber is ready to close.

For the record, here are the weights of the glass optic, compared to the weight of the dummy we used to tune the suspension:

BS optic = 14,251g

Dummy mass = 14,180g

So, the optic hangs a bit lower in the structure than the metal dummy mass - Travis confirms this with the position error of the top BOSEMs.  We will correct this if IAS measures that we need to.

Also, FYI - a BS shipping cake tin weighs = 22,538g

- Giacomo, Cheryl

Alignment of the IMC, and IM3 and IM4, increased IFO REFL from 106mW earlier this week to 147mW today, giving 90% power coupled into the IMC.  In our first measurement, the IMC alignment had drifted away from optimum, and the the IFO REFL beam was clipped on the baffle in front of IM4.

Power budget: