Mitchell, Margot, Myself

Over the past two days, we have managed to re-launch ACB assembly in the LVEA teststand cleanrooms.  The first day was largely clearing space in the cleanrooms and locating and reclaiming parts (most of the parts had prematurely been put into 3IFO storage).  By the end of today, we have the baffle box mostly assembled, with the exception of the extension due to running out of, of all things, 1/4-20 washers.  More washers have been located in SUS stock.  Tomorrow, we plan to wrap up assembling the baffle and move onto the suspension.

As a preparation for the upcoming dual arm experiments, I started revisiting the PRMI lock.

• PRX and PRY locked OK. Though there was an issue related to the state definition.
• PRMI locked only for ~ 1sec. I am not sure if I am allowed to call it locked. Anyway I believe this indicates that at least the control signs are correct. Probably the LSC gains need to be tweaked for locking it reliably.

PRX and PRY locking:

I started it from PRX as usual. The alignment at the beginning was not terrible: the beam was multiply-bouncing in the power recycling cavity. Aligning PRM immediately gave me good fringes in POP18 and REFLAIR PDs. Note that I assumed that the input pointing had been already good so that I don't have to tweak IM4, PR2 or PR3. Once I got the right LSC settings, it locked reliably as it used to be. I had to set the state definition to be manual for LSC-PD which toggles either only analog or digital sides of the whitening filters. Also I enabled the PR2 and PRM L2P filters because they were not on. I simply put a gain of 1 on them. It didn't seem to do something bad.

I steered BS to get the highest buildup in PRC when I was locking PRY. I had to move the pitch by 7 urad and yaw by 2 urad. Note that they had been originally adjusted for the ALS-Y beam and the alignment sliders had at 190.10 and -268.40 for pitch and yaw respectively before I steered it.

PRMI locking:

BS didn't have the oplev servos running, so I enabled them. All the LSC settings were done by the guardian. I am not sure why it doesn't lock at this moment. I am hoping that tuning the LSC gains will give a smooth lock once we (re-)figure it out. There were several times of short-lock: each of them stayed locked approximately for 1 sec. It looked as if the PRC gain was not big enough. However, increasing the PRC gain did not improve the situation. Hmmmm. I tried different gain settings, but no luck so far.

Some other notes:

Also, I was not sure how well the beam pointing had been adjusted. We may want to revisit the pointing because it can repeatedly lead to unnecessary alignment exercise in PRMI.

In HAM 4, today I:

• Replaced the 4 errant blade tip EQ stops (required use of tweezers) discovered yesterday.
• Used the canning cone to spray FirstContact onto the SR2-HR surface in order to reinforce the thin sheet already on it.  This is in prep for pulling the sheet later - it occurred to me to do this now since I am installing other HWS/Baffle items close to the SR2-HR and spraying FC later will require moving it all again.
• Suspended the masses and rechecked with quick TF that chain is free of mechanical interference.
• Reattached and realigned all 14 OSEMs in 6 DOFs, each.
• Finished attaching and tightening balance of dog clamps to SR2.
• Discovered that there is a missing cable table bracket.
• Attached witness plate and 1" witness optic holder into places.
• Set 1 of the HWS baffles in place on the table - cookie cutter didn't look quite right.
• Set the SR2 AR baffle into place - again the cookie cutter didn't look at all right.
• Set the SR2 Scraper baffle into place - same story, cookie cutter isn't quite right.  Also, discovered I don't have the correct AOS washers which are used on the unique scraper baffle hold-down clamps.
• Stopped to go figure out what the heck is up with the cookie cutters, and find specific washers.

(Alexa, Daniel)

Continuing yesterdays work we locked on PRX and installed the beampspitter in the POP path in front of POPAIR_A. The beam was very weak and we had some fun aligning it. We needed an additional lens (ROC 500mm) to keep the beam small. After the beam combiner we measured 170nW of power. Another short focal length lens was installed after the combiner to focus the beam down. We are still missing a photodetector.

The h1nds0 NDS server has been restarted to allow it to read the recently archived raw_minute files. This is not the default server, so users should not have noticed.  Maintenance is ongoing, and will finish tomorrow afternoon.

-TCSx a few hours work left TCSy has problems with control box, on hold. Continuing work on HWS. More projections to do.
-HAM4 baffle install ongoing. Cleanroom clearance issues being negotiated.
-SR3 going into HAM5.
-Ey ESD short center pin to shield, RichardM will cut shield. Fil will double check Ex.
-Adding 2 GigE cameras to system, Cyrus will modify switches to allow connection.
-ALS diff ongoing, top mass and UIM working. ESD not working, saturation at .5hz.

model restarts logged for Tue 06/May/2014
2014_05_06 03:27 h1fw1
2014_05_06 11:17 h1isiham4
2014_05_06 11:34 h1fw0
2014_05_06 17:02 h1fw0
2014_05_06 21:03 h1fw0
2014_05_06 22:34 h1fw0
2014_05_06 23:48 h1fw0

h1fw1 perhaps still slightly unstable despite solaris reboot. Tue maintenance on HAM ISI. h1fw0 offloading min trends from SSD, looks like this has made fw0 unstable.

Took particle counts in and around the HAM5 chamber before installing the SR3 cookie cutter. 

   Before opening the chamber (soft cover) clenaroom counts were 0 for all particle sizes. 
   After opening the soft cover particle counts outside the chamber were <100 for all particle sizes.
   After opening the soft cover particle counts inside the chamber were 0 for all particle sizes.
   After installing the cookie cutter for SR3 the in chamber particle counts jumped to just below 500 for 0.3 micron sizes and dropped off as particle size increased. 
   After 5 minutes the highest counts for all particle sizes had dropped back to <35 counts.

Note: The RH of the out of chamber cleanroom air was 26%. The first check of the in chamber environment showed a RH of just 7%.  
   

Took PET swipe samples from 05/06/2014 of HAM4, HAM5, & HAM6. These samples were taken after the SR2 alignment was completed and before any suspensions are installed in HAM5. 

Margo P. did a wipe down on the HAM5 chamber. 

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Kiwamu, Stefan, Sheila

We again tried the the ESD feed-back - see title for conclusion:

In detail:
 - We patched the UIM transfer function above 2Hz with a LISO fit.
 - We verified the sign of all 3 involved states - they are all negative.
 - We checked the measured transfer functions against the suspension model - they looked all right.
 - We checked the model (assuming ideal inverted plants) for proper x-ing (plot attached).
 - Trying to engage the TST drive we ran into TST mass ESD saturations at 0.5Hz.
   The blend high pass still lets signal through at that frequency.
 - We started a detailed transfer function measurement for TST (L3) from 2Hz to 0.2Hz, but were interrupted by a small earth quake.


Remarks:
 - Some useful LISO and foton tools are in ~controls/sballmer/bin:
   - LISO2FotonZPK: convert a LISO fit file into a zpk design string readable by foton.
   - mkfotoncal:  convert a foton zpk design into a list of poles and zeros readable by the DTT calibration feature.

 

(Alastair H, David H, Greg G, Thomas V, Matt H)

Summary of work:

HWS

• No additional work since last friday

TCSy

• The majority of the on table components have been staged on the table ready for alignment
• The persicope mirrors were placed in the mounts and a red HeNe beam has been used to align a path for the laser to go up the periscope and be centered onto the CP
• Having some troubles getting the laser to turn on. The 4 control boxes have to try on site (not counting the X-table one) do not enable. Even trying it on the TCSx table the control boxes do not enable. The TCSx box does enable when trialed on teh TCSy electronics, so it appears something is amiss with these boxes that will need to look into

TCSx

• The optics and photodiodes for the ISS path have been aligned. Note: The photodidoes are not in their final position as I was cautious and didnt put the photodiodes as close to the focus as will need them to go as didnt want to fry them without trialing them. So need to push photodiodes back closer to focus to get all the beam into the photodiodes
• Like TCSy, a red HeNe beam has been used to to align a path for the laser to go up the periscope and be centered onto the CP. We checked that we could scan the beam up and down and side to side across the optic within the range of the actuators on the top mirror on the periscope. Irises were placed in the beam path defined by the red beam to align the CO2 beam to
• The breaker box for the ISS box sent recently from CIT for installation has been placed in series between the feedthrough and the ISS box as requested.
• We have roughly aligned the central heating beam path onto the irises and are now working on the annular heating path being aligned to these irises also.
• We stil have one more lens to put in as well and then fine tune alignment to he irises before ready for a projection
• Laser shields have slowly started to be placed in where we can at the moment.
• Also need to recheck alignment to the power meter and the FLIR camera as we have to adjust a beamsplitter to allow the CO2 beam to go into the irises, thue potentially having adjusted this beam path.
• Ive also noticed that in MEDM that some channels are mislabeled so when get a chance will need to change these also

Thanks to everybody who was patient and allowed us to stay laser safe and the gate valves closed until we got both visible beam alignments done for both tables (I know we took a little longer than said we might)

And fingers crossed that the much talked about off table projection for TCSx occurs tomorrow at some stage :-)

We replaced the bulb on the right-hand projector today (the one closest to the MSR).

Kyle soft-closed GV7 and GV5 for TCS alignment work on BSC1 and BSC3 at 9:00 am.
I opened GV7 and GV5 after alignment work was done, last valve open by 3:00 pm.

I copied the filter kHz2um from EX to EY, and modified the xml file to have them engaged permanently. This way we have the L2L SUS transfer functions in um/cts.

(Alexa, Daniel)

We went on ISCT1 to install a new interference path to measure the difference between the PSL sampler beam and the POP beam. This will allow us to measure the path length variations on the input path relative to the green path.

We installed a new 50:50 beamsplitter in the rejected beam of the first dichroic after the SHG. This picks of the red beam coming from the PSL (and some left-over green).  Next, we added a new beam path from the POP beam to the other input port of the beampslitter. Currently, there is no detector and all beams are dumped. The 50:50 splitter in the POP path is still missing as well.

We readjusted the green beam path coming from the PSL to eliminate the clipping on the cube polarizer.

8:00 Crystal chiller refilled (180 ml added)- Operator
8:51 GV5 and GV7 soft closing – Kyle
8:56-14:11 Heading to the TCSx area – Matt/David
9:06-9:58 Heading into the LVEA (supervision) – Mike 
9:16-11:45 Going to End Y for ESD work – Richard/Filiberto
9:4412:04 Contamination Control work – Jeff B/Margot
9:49-11:47 HEPI Pump #8 maintenance – Hugh/Cori
9:50-12:10 HAM4 Scraper baffle work – Betsy
9:54-11:39 Heading into the LVEA for SR3 alignment setup – Jason
10:10-12:00 Cavity baffle work in LVEA test stand West bay area – Travis/ Mitchell
10:30 Reset of HEPI L4C Accumulated WD Counters – Operator
10:38-12:00 Heading to End Y to set up a camera – Sheila
11:25- Shutting down fw0 to transfer trend data – Jame B.
12:49-14:00 Cleaning work at End Y – Karen
12:49- Cleaning work at End X/Mid X – Chris
13:19- Working in the Optics Lab – Justin
13:26-15:25 Back to Cavity baffle work in LVEA test stand West bay area – Travis/ Mitchell
14:16 LVEA transitioned to LASER HAZARD - Justin

Right now, the best configuration for the ISI-BS is the following:

HIGH_ISOLATED on ST1

DAMPED on ST2

This specific configuration is not possible with the guardian manager (SEI_BS) for now: if you put ISOLATED with the manager, both stages are going to go to HIGH_ISOLATED.

Thus, the temporary solution is to PAUSE the guardian manager and to use the individual guardians (ISI_BS_ST1 & ISI_BS_ST2).

Jamie will be here next week and will fix this situation.