Picomotor Washers, ISS Array HAM2

Matt, Rich

All picomotors in HAM2 have been retrofitted with Kapton washers to prevent the motor from sticking upon full insertion of the screw thread.  The process of installing the Kapton washers in HAM2 was made far easier when Matt had the good idea to cut the washers (now known as the Heintze Cut) such that they can be put on one-handed (See attached photo).  Essentially, what started as a simple washer shape ends up more like a Greek capital omega.  After that bit of cleverness, it is now possible to actually put the washers on all the picomotors in HAM2.  All washers should be so cut from now on.

While in HAM2, I had a chance to see the ISS array cabling.  Given the constraints, what has been done is about as good as can be done.  A decent cable strain relief has been implemented.  Unfortunately, as the PSL folks well know, there is really not much holding the connectors in place.  Just prior to closing this chamber, it's essential to gently verify the connectors are fully seated as I found two that were not fully engaged.  Matt mentioned how the halogen flood lights can be used to illuminate the array such that it's possible to see the 120Hz detected by each PD; this should also be done prior to final closing.  It's suboptimal, but it's what we have.

Moth Reminder

I got a Moth reminder today when I had two fly over my shoulder and into HAM2 whilst I was working on MC3 (covers barely down 5 minutes) this afternoon. I got them out after only a little bit of time inside, but just a reminder to everyone...including myself...to try to not leave covers down when you are not working in chamber.

Todays work

Kate G, Rich A, Calum T, Matt H

Again another big thankyou to Kate, Calum and Rich for coming in for another marathon session today (which is still going I am just getting a jump on the alog). Much appreciated you all coming in on both days of the weekend to do this and help me

Things for the most part went really well today. Today we:

• finished locking MC1. Rich watched the magnets on the back as I gently pushed the optic back using the front stops until the optic hit the back stops (because back stops locked in place). I then locked barrel EQ stops and removed the front EQ stops on the optic. MC1 now ready for FC
• Took front EQ stops off PRM and MC3 optic. Both now ready for FCing
• Installed Kapton washers on pico motors in HAM 2 (Rich will write a bit more on this). All Kapton washers now installed on pico motors in HAM2 and 3
• Inspection occurred on ISS array cabling/strain relief (Rich will write a bit more on this).
• SR3 was finished being first contacted and the baffle in front of SR3 put back in place
• SR3 was released for Arnaud to take TF's overnight if he wants
• SR2 was first contacted, Face EQ stops put back in place and TCS mirror put back in place
• Beamsplitter optic finished having its FC applied.

I think thats most of it. Doesnt sound like much but was a full day

 

So HAM4 and HAM5 should still be on schedule to get all doors on tomorrow (if I can have Apollo guys for doors, SEI guys to check balance (and unlock ISI at the end), Arnaud to do quick TF's for me and Jeff B to put wafer in for me, and someone to help me wipe down in HAMs 4 and 5 I should be able to get unlocked and all doors on in short order), . Here is what I believe are the steps to go:

HAM5 (should do first I think)

• Double check ISI balance quickly
• Lock SR3
• Quick last wipe down
• Peel FC on SR3
• Peel FC on small monitor optic on SRM
• Unlock SRM
• As unlocking SR3, install wafer
• Quick pitch TF on each suspension to see if have unlocked correctly
• Quick last check for tools, etc
• Unlock ISI
• Doors on

HAM4

• Double check ISI balance quickly
• Chamber clean (hasnt been wiped down yet, and this is why think HAM5 should go first)
• Install wafer
• Peel FC on SR2
• Peel FC on monitor optic on SR2
• Unlock SR2
• Quick pitch TF to see if have unlocked suspension correctly
• Quick last check for tools, etc
• Unlock ISI
• Doors on

Additionally I believe Kate/Calum et. al. tomorrow are going to try to finish off the FC on BSC3 (painting the outer "crust" and then move onto starting the 4 triples in HAM2 have to do FC to.

Note: The HAM AUXs ARE NOT locked in HAM2 and I dont plan on locking them at this stage for the work that needs to go on in there. So though the main optics are locked pleas go a little eay in HAM2 if you find yourself workin gin there

Preparations for discharging ETMY and hypotheses for the charging

K. Ryan, J. Worden, R.Weiss
The attached document describes the preparations of the ionizer for the discharge of ETMY and
possible hypotheses why the charge is so large on the test masses. The document is also on the DCC
as T1400477.

CDS model and DAQ restart report, Saturday 19th July 2014

model restarts logged for Sat 19/Jul/2014
2014_07_19 19:59 h1fw1

unexpected restart of h1fw1.

Humidity in chamber fluctuation

Based on yesterdays FC troubles I went back and had a look at some of my alogs regarding humidity in chamber.

By looking at the various pics I posted of particle counts in links:

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12874

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12873

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12866

https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=12859

You can see the humidity in chambers varies from 13%-33%. I was surprised at this, and I have to take back what I had said to Kate and Calum yesterday at how I said I had noticed that the humidity levels usually stayed pretty constant in chamber here at LHO

Standing of chambers at this stage

Kate G, Calum T, Rich A, Matt H

First of all a BIG/MASSIVE/ENORMOUS thankyou to Calum, Kate and Rich for putting up with a slave driver like me and working a 12 hour shift with me on a saturday

 

Standing of chambers at the moment as I remember it:

HAM2

PRM..locked…however still need to lock optic barrel stops and remove front optic EQ stops..then ready for FC

PRM baffle…removed

PR3..locked. Ready for FC

MC3..locked…however still need to lock optic barrel stops and remove front optic EQ stops..then ready for FC

MC1..partially locked

Kapton washers not installed on picomotors yet

ISI…locked

 

HAM3

MC2…FC applied and unlocked

PR2….FC applied and unlocked

Large Kapton washers installed on all picomotors

ISI…unlocked

Covers pulled back from ISI

Coarse wipe down of chamber has occurred

 

BSC2

Beamsplitter optic…locked

ISI…locked

First contact applied to optic...still need to paint "crust"

New baffle installed

Old baffle needs to be reinstalled after FC pulled

Chamber wipe down occurred

 

HAM4

SR2..locked…however still need to lock optic barrel stops and remove front optic EQ stops..then ready for FC

TCS optic in front of SR2 optic removed

ISI…locked

 

 

HAM5

Faraday..unlocked

ISI…locked

SRM…locked…no FC will be applied

SR3…locked. Spray FC applied, need to paint edges

SR3 front baffle removed

Chamber wipe down occurred

 

BSC3

Suspension..locked

FC applied to optic…..still needs outer crust applied I believe

Arm cavity baffle still pulled back I believe.

 

Particle counts

HAM4

In cleanroom start of arvo session

All counts zero

 

In chamber start of arvo session

0.3um...210 counts

0.5um...80 counts

0.7um...30 counts

1.0um...30 counts

2.0um ...10 counts

5.0 um....0 counts

Probably high due to baffle work

Pics attached if people interested in RH/temp

 

Focus of tomorrow is to try to finish HAM4 and HAM5, maybe finish BSC3 and BSC2 first contacting, and do some more work in HAM2. See how we go

HAM3 SUS and ISI unlocked---back to Hugh for more testing

Calum, Rich A, Kate G, Matt H

 

More detailed report to come, but Hugh indicated to me that his TF's werent finished when I unlocked this morning. Thus we concentrated on HAM3 and have got the suspensions FC'd, chamber cleaned, everything back in place, Suspensions unlocked, ISI unlocked, covers pulled back.

 

Hugh its over to you for more testing. Have fun

Beam Splitter Baffle Installation

Calum, Rich

Installed beam splitter baffle.  The installation was a bit tricky at first, but then went relatively smoothly.  

Key lessons learned:

Once you are poised to install the parts, these cryptic instructions will make sense...
1.  Despite a feeling that the parts won't fit, they actually will.
2.  Put the earthquake stops onto the earthquake stop bracket prior to mounting the bracket onto the flat plates.  Failure to do this means a fussy installation after you bolt the flat plates in place.
3.  When putting in the flat plates that are parallel to the barrel of the optic, keep the top mounts loose to incrementally achieve clear alignment on the multiple fasteners.
4.  After installation of the flat plates, it is helpful to slightly bend the aluminum plate to achieve a bit better clearance of the lower prism.
5.  When installing the side channels, fully insert them into their final position prior to putting the H-bracket on.  The side plate will index against the side of the suspension cage so you can relatively easily get the fasteners in without threatening the suspension wires or prisms.
6.  The clearances are pretty small and the stakes are pretty high.  Move slow and avoid coffee.

Other things will conspire to make this installation tricky, but they are not to hard to figure out on the fly.

Low overhead clearance hazard at Xend

The path around the H2 BSC chamber to the back side of the vacuum envelope at EndX goes through and under the white steel frame for the SEI and SUS mating.   See photo below.

The overhead clearance is really low, about 5 to 5.5 feet.  It can be and has been a real head buster.  Especially hard to navigate with (often fogged) laser glasses, clean room garb etc.

Mike Vargas added some red tape to both sides while I was picking myself up.

We might consider dismantling it now or somehow rerouting  the path to the back side.

Pcal work at Xend last afternoon/evening

Darkhan Tuyenbayev, Forrest Shriver, Thomas Abbott, Travis Sadecki

Travis installed the Pcal ETM target on the suspension frame.

EndX was transitioned to Laser Hazard for the Pcal 1047 nm laser.

Checking Pcal periscope structure alignment began by sliding under the Arm Cavity Baffle.  Had do move the particulate witness plate about a foot East from directly under the center of the ACB.

Got a good start on the alignment checks.  Plan to return Monday morning to continue with this work.

EndX transitioned to Laser Safe before leaving.

Particle counts for this morning

HAM4

In cleanroom start of session

All counts zero

 

In chamber start of session:

0.3um..10 counts

0.5um...10 counts

0.7um...10 counts

rest zero

 

In chamber end of session

(Didnt bother as was only in there for 2 minutes total)

 

HAM2

In cleanroom start of session

All counts zero

 

In chamber start of session

All counts zero

 

In chamber end of session

All counts zero

 

HAM3

In cleanroom start of session

0.3um...10 counts

rest zero

 

In chamber start of session

All counts zero

 

In chamber end of session

0.3um...350 counts

0.5um....180 counts

0.7um....110 counts

1.0um...70 counts

2.0um...20 counts

5.0um...0 counts

I took the readings 4 times and these are accurate. Mind you I guess it could be due to a combination of me moving baffles, and by this stage also work was going on in BSC2 trying to put the baffle on

 

I have included pics for people fo humidity/temp readings as well

HAM2 3 of 4 SUS's locked to date..not ready for FC'ing yet

I have locked the face stops of the intermediate and bottom mass of three of the 4 HXTS's in HAM2. Just MC1 to go (which of course will be the hardest). I have marked the position of the baffle in front of PRM using dog clamps and removed the baffle

HAM3 ready for FC'ing

After locking the ISI, I then proceeded to lock the face EQ stops of the intermediate and bottom mass of MC2 and PR2. Then like in HAMs 4 and 5 yesterday I had a look around at the other EQ stops on both suspensions on all three stages. All look in good position and the nuts are locked down, so didnt have to touch them.

I marked the positions of the MC2 and PR2 scraper baffles using dog clamps and both scraper baffles have been removed to allow access to the optic to first contact them

HAM3 ISI locked

Well I left it as late as i could to try to make sure that Hugh's TF's were finished..but for the record in case I didnt, at a little after 10am I started the locking process on HAM3. The "A" locker is a little sticky but other than that is fine

CDS model and DAQ restart report, Friday 18th July 2014

model restarts logged for Fri 18/Jul/2014
2014_07_18 10:48 h1iopsusey
2014_07_18 10:50 h1susetmy
2014_07_18 10:51 h1sustmsy
2014_07_18 11:17 h1broadcast0

no unexpected restarts. EY rcg2.8.4 revert, add chan to broadcaster.