Travis and I went into the 3 vertex BSC's this morning, and locked ITMY (for ACB install) and unlocked ITMX. While I was there, I looked around at BSC2 for possible rubbing, and checked ITMY for loose masses but found nothing. Will try running tf's at BSC3 today, but the activities out there might make it a futile attempt.

Attendees: Bubba, Jeremy, Matt, Dugh, Robert, Jeff K, Mike, Hugh, Stuart, Jason, Terry, Jodi, Vern, John, Travis, Guillermo, Mitchell, Arnaud, Aaron, Keita, Jeff B, Jim, Filiberto, Richard, Dale, Gerardo, etc …

Today's Tasks:

•	Work will continue on HAM2/HAM3 today – Matt/Jeremy/Apollo
•	Contamination & Control will be present at HAM2/3 activities– Jeff B
•	Illuminator work at End Y – Aaron
•	Locking/ Unlocking suspensions on BSC1/BSC3 respectively - Travis 
•	Stage Viewport preparation will continue today - Gerardo
•	Mitchell and Mike V will continue with ACB work (Travis will assist)

A set of TFs were previously taken for the SR3 (HLTS) suspension (see LHO aLOG entries 12929 and 12945), to complete Phase 3a power spectra have been taken with damping loops both ON and OFF for all stages. These H1 SR3 power spectra have also been directly compared with equivalent H1 PR3 measurements (allhltss_2014-07-24_Phase3a_H1HLTSs_ALL_Spectra_D*.pdf). The plot key is as follows:-

Black Dashed Line = Expected Sensor Noise
Blue Solid Line = H1SUSPR3 2013−10−07_0800
Green Solid Line = H1SUSSR3 2014−07−24_1030

Summary:

Noise floors for SR3 are consistent with expectations. However, it should be noted that virtually all M1 stage OSEM channels exhibit narrow frequency comb features above ~20 Hz, which are only present in the damped power spectra and could therefore be be re-injected noise from the electronics chain and will need to be further investigated.

All data, scripts and plots have been committed to the sus svn as of this entry.

A clean set of TFs were previously taken for both SR2 & SRM (HSTS) suspensions (see LHO aLOG entry 12950), to complete Phase 3a power spectra have been taken with damping loops both ON and OFF for all stages. These power spectra measurements have also been directly compared (allhstss_2014-07_24_Phase3a_H1HSTSs_ALL_Spectra_D*.pdf). The plot key is as follows:-

Black Dashed Line = Expected Sensor Noise
Blue Solid Line = H1SUSSR2 2014−07−24_0900
Green Solid Line = H1SUSSRM 2014−07−24_1000

Summary:

Noise floors for both SR2 & SRM are consistent with expectations. However, it should be noted that SRM M1 T3 LF and RT channels exhibit a comb of narrow frequency features above ~20 Hz, which since observed in both damped and undamped power spectra could be induced by ground loops.

All data, scripts and plots have been committed to the sus svn as of this entry.

After securing doors on HAM3 (see LHO aLOG entry 12975), TFs have been taken overnight as part of Phase 3a testing to check for rubbing or other issues that may have developed as follows:-  

- PR2 M1-M1 undamped (2014-07-24_1090302332_H1SUSPR2_M1_damp_OFF_ALL_TFs.pdf) 
- MC2 M1-M1 undamped (2014-07-24_1090284714_H1SUSMC2_M1_damp_OFF_ALL_TFs.pdf)

HAM3 ISI Status: ISI unlocked, no damping or isolation loops running.

PR2 & MC2 alignment: No offset was applied during this measurement.

The undamped measurements from above have been compared with other H1 HSTS suspensions at Phase 3a of testing as well as the model (allhstss_2014-07-25_Phase3a_H1HSTSs_M1_Doff_ALL_ZOOMED_TFs.pdf).

Summary: 

Both PR2 & MC2 M1-M1 TFs show good agreement with the model and perform consistently with other HSTS suspensions, thus raising no concerns.

All data, scripts and plots have been committed to the sus svn as of this entry.

The licenses for Matlab are now being served by a local CDS license server, which should reduce the vulnerability of network interruptions to Caltech in obtaining Matlab licenses.  This applies to new matlab sessions started from newly opened shells, existing open Matlab sessions should be unaffected.  Also this only applies to Ubuntu workstations at this time.

The only change you may see is warning messages on startup referencing non-existing directories in the matlab toolbox path.  We have licenses for more packages than are installed, which causes the warnings.  This will not affect your ability to use Matlab.  

Undamped transfer functions will start on opsws1 and opsws10 when HAM2 ISI measurements will be done

Matlab TFs are set to run on HAM3 suspensions overnight as follows:-  

- MC2 (HSTS) M1-M1 undamped TFs, Starting at ~6:00pm July 24th (local)
- PR2 (HSTS) M1-M1 undamped TFs, Starting at ~11:00pm July 24th (local)

When complete at ~3:00am July 25th (local), the measurement status will revert to OFF and damping loops will be restored to the ON state.

These measurements have been initiated from the opsws2 workstation.

08:45 Matt H. and Jeremy going into HAM2
08:50 Mike V. going into LVEA to help Mitchell with CPB
09:12 Stewart going into HAM3
09:18 Filiberto swapping ITMY and ITMX UIM coil drivers [WP 4748]
09:20 Hugh going to BSC1
09:38 Nathan starting unattended work with laser in OSB optics lab
10:12 Filiberto finished WP 4748
10:19 Mike L. going to LVEA west bay to work with Gerardo on optic charging experiment
10:47 Mitchell and Mike V. going to LVEA west bay to move CPB
10:54 Gerardo going to LVEA west bay to work on optic charging experiment
11:06 Hugh and Jim out of BSC1
11:44 Mitchell and Mike V. out of LVEA
12:51 doors going on HAM3
12:55 Jeff B. and Andres going to HAM3
12:59 Stewart going to HAM3
13:03 Richard going to end Y to take pictures through viewports
13:22 end X transitioning to laser hazard
13:43 Mike L. and Gerardo going to west bay to work on optic charging experiment
14:24 Richard back from end Y
14:45 Manny to end Y to turn off illuminator
15:15 Jim B., Patrick replacing light bulb in right side projector
15:16 Paul and Jordan to end Y to pull cable for accelerometer
15:18 Kyle starting WP 4749, PT343 valved out from beam tube volume
15:33 end X transitioned to laser safe
16:02 Mike L. and Gerardo out of LVEA
16:30 Gerardo and John W. discovered that the right side projector is overheating, taken down
16:45 Nathan will be supervised by Dick G. in the OSB optics lab

Closed 10" gate valve at X1-9 port on X1 beam tube -> PT343A,B now unpumped and no longer measuring beam tube pressure -> Ignore PT343B until further notice -> Replaced 1.5" O-ring valve at X1-9 with portable RGA assembly -> Will leave 10" valve closed for the next several days while I bake the RGA -> Following RGA bake-out, GV14 will be closed and the 10" valve opened for a few days so as to acquire pressure accumulation data on the X1 beam tube module 

(Matt H, Stuart A, Jeff K, Jeremy B)

After getting the okay from SEI, I unlocked the 4 HXTS's on HAM2. TF's were run on All 8 suspensions (4x HXTS, 4x HAM AUX) on the table and all were given the all clear. So SEI TFs should be good to start..once we damp the suspensions of course :-)

We took particle counts. Cant remember exact number but Stuart has the numbers and i believe will post

Jeff B, Andreas, Jeff K, Stuart A, Jeremy B, Matt H, Apollo).

Both doors on HAM3. Jeff B started by inserting optic Started on PR2 side as that is the "least" important of the two optics in tha chamber. There was a drop of FC under the optic (not from a run down the optic, obviously fell off during painting) so that was cleaned up easily. Once particle counts deemed good to go, first contact was peeled (there was a little bit of the outer crust left behind from say 2-3 o'clock position and 4-5 o'clock position.....I decided not to attack it with a swab and just leave it...Calu you need to practice your first contact outer layer painting skills :-) :-D). Its only a bit and well out of the beam path. Optic was unlocked and TF's taken. Once given the all clear door went on. Stuart has a log of particle countsduring process, timeline and also how many particles I deemed I saw on optic throughout the process.

Once HAM3 east door on, we checked particle counts on west side. These were low and so went to peel FC here. Found that top gun nitrogen tank low, so swapped out before blowing to peel FC. Once swapped, peeled FC, again unlocked suspension and then did TF's. Once these past door went back on. They had some troubles getting a good angle to put door on so took a little longer than wanted. Again Stuart has log of timeline, particle counts, particulates on optic, etc.

I talked to Travis about mobility wafer and if he wanted it replaced (by replace I mean swap out the the wafer already in it....it was put back in its original position before the ISI guys balanced the table by Travis and I) before we closed up. He suggested to leave it as looking for a delta if anything moves from time of closing/pumping down...so I left it as is.

Damn...I know one thing I forgot.....to peel the FC on the small optic...how did I forget that #facepalm.......hmm  I wonder if I took off a viewport I can reach in and get it. Its on the outer leg of the MC2 suspension. Will talk to Calum about.  Who has the longest reach at LHO ? We may just be able to get it from the viewport.....To all and sundry....dont let me forget for HAM2............

Running from opsws3. No touching.

Not too bad to rebalance but only because everything needed was in the LVEA.  One of the four 10Kg Optical Table Masses(D0901075) had to be removed as there was so little wall mass on the West side of the ISI walls.  The bottom mass of the two stacker was removed and the upper damped mass was moved to the table top onto the damping viton.  So all three masses remaining on the table top are unbolted and resting on viton damping pads.

The total mass reduction of the Balance Mass Payload is 3.5kg.  Will update the drawing for this as-built.

This morning Hugh and Jim rebalanced the BSC1 ISI.  In order for them to test, I jumped in and unlocked the SUS.  I ran quit TFs of V and P DOFs on both the main and reaction chain to confirm the SUS is healthy enough for ISI TFs.  SEI is launching testing on BSC1 now.

Considering it is my last day, I decided I should write up a summary of what I have been doing this summer.

Summary:
The lid of the laser was put on too early, alarm should be put in place at 70% relative humidity inside the laser to warn of a leak.

Details:
In the laser room, there was a leak on 7/1. When I looked into it, there were no clear indicators in the Laser Room temperatures or relative humidity levels, but I finally found the right channel inside of the laser box. The relative humidity inside the laser box usually stays around 40% has never gone over 60% in the last two years until this leak, when it spiked at about 85%. After the initial leak, the humidity went way down to about 35% because we removed the lid and really dried it out, but once we replaced it, the humidity jumped way back up again. We must have put the lid on too early, but it is slowly drying out. Today, the humidity is sitting at about 60%.

In the attached photos, the first one is a plot of the relative humidity in the laser box over the last two years, and you can see it only gets close to 60% one time (excluding the leak). The second picture is from the leak until now. You can see in this one the first peak is the leak, then it goes way down because we dried it out, and suddenly peaked again. My guess is that we put the lid back on too early, and it may still need to dry out more.

I believe the slow up and down trends in the humidity are due to the changing seasons. It tends to be more humid in the summer and less humid in the winter.

Summary:
In order to reduce temperature differences between commissioning mode and science mode, we should keep the temperature in the laser room at about 22.8 degrees C to keep it consistent with science mode temperatures which are much harder to change.

Details:
In the most recent switch from commissioning mode to science mode at 2:00 PM on 7/14, there was a difference of about 3 degrees C in the Laser Room, which is better than previous switches which have had a 4-5 degree difference. The changes are more significant on the temperature sensors on the table than the ones in the air conditioner. My assumption is that this is because the air conditioner keeps them cooler most of the time until they are shut off during science mode. The temperature inside of the laser only changes by less than 1 degree C, and seems to only be slightly affected.

The third picture attached is a plot of the four temperature sensors in the Laser Room during a transition from commissioning mode to science mode. The two graphs on the left are in the air conditioning units in the Laser Room, and the two on the right are on the table. I think the sensors on the table should be moved to the floor to prevent other factors from affecting them.

I also believe the names for the PSL environment sensors may have been mixed up, the thermometer on the south side of the table is closer to the laser box and generally is a few degrees warmer, but it is labeled as north, so this should be looked into.

This morning, with Hugh's help, I went into BSC1 and unlocked and rebalanced the ISI. Rather difficult, as I had to use the masses on the side of St2. At one point, I had to cram my body as far up into the dome as I could physically fit to remove mass off the top-most mounting points. The floating position looks good, and the ISI is currently unlocked (per Betsy's instructions), but the lower stages of the quad are locked on the barrels. Will try for Tf's tonight, if possible.